CN114094591A - Automatic voltage control method, device, computer equipment and storage medium - Google Patents

Automatic voltage control method, device, computer equipment and storage medium Download PDF

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Publication number
CN114094591A
CN114094591A CN202111367454.9A CN202111367454A CN114094591A CN 114094591 A CN114094591 A CN 114094591A CN 202111367454 A CN202111367454 A CN 202111367454A CN 114094591 A CN114094591 A CN 114094591A
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China
Prior art keywords
reactive
distribution network
control area
reactive power
coordination control
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Chinese (zh)
Inventor
曹德发
李志华
李灵勇
廖明
饶巨为
林志杭
石扬
曾晓丹
彭静
李振杰
王碧维
李延宾
沈均良
黄海坤
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Guangdong Power Grid Co Ltd
Meizhou Power Supply Bureau of Guangdong Power Grid Co Ltd
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Guangdong Power Grid Co Ltd
Meizhou Power Supply Bureau of Guangdong Power Grid Co Ltd
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Priority to CN202111367454.9A priority Critical patent/CN114094591A/en
Publication of CN114094591A publication Critical patent/CN114094591A/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
    • H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
    • H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
    • H02J3/1835—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
    • H02J3/50—Controlling the sharing of the out-of-phase component
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/10—Power transmission or distribution systems management focussing at grid-level, e.g. load flow analysis, node profile computation, meshed network optimisation, active network management or spinning reserve management
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/30—Reactive power compensation

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

The embodiment of the invention provides an automatic voltage control method, an automatic voltage control device, computer equipment and a storage medium, wherein the method comprises the following steps: the method comprises the steps of inquiring electrical equipment in a preset area in the power distribution network to construct a distribution network coordination control area, counting reactive indexes of the electrical equipment in the distribution network coordination control area under multiple levels, counting voltage indexes of the electrical equipment in the distribution network coordination control area, adjusting the running state of the distribution network coordination control area according to the reactive indexes and the voltage indexes, reducing the granularity of evaluation under automatic voltage control, increasing the dimensionality of evaluating the reactive indexes, ensuring the comprehensiveness of a control strategy, and improving the efficiency of the automatic voltage control.

Description

Automatic voltage control method, device, computer equipment and storage medium
Technical Field
The embodiment of the invention relates to the technical field of electric power, in particular to an automatic voltage control method, an automatic voltage control device, computer equipment and a storage medium.
Background
The AVC system is constructed on the energy management system EMS, and can utilize a model and real-time operation data of the power grid to decide an optimal adjustment scheme from the perspective of global optimization of the power grid.
Currently, the granularity evaluated under automatic voltage control is large, so that the consideration of a control strategy is lacked, and the efficiency of automatic voltage control is low.
Disclosure of Invention
The embodiment of the invention provides an automatic voltage control method, an automatic voltage control device, computer equipment and a storage medium, and aims to solve the problem of low efficiency of automatic voltage control in a power grid.
In a first aspect, an embodiment of the present invention provides an automatic voltage control method, including:
inquiring electrical equipment in a preset area in the power distribution network to construct a distribution network coordination control area;
counting reactive indexes of the electrical equipment in the distribution network coordination control area under multiple levels;
counting voltage indexes of the electrical equipment in the distribution network coordination control area;
and adjusting the running state of the distribution network coordination control area according to the reactive index and the voltage index.
In a second aspect, an embodiment of the present invention further provides an automatic voltage control apparatus, including:
the control area building module is used for inquiring the electrical equipment in a preset area in the power distribution network so as to build a distribution network coordination control area;
the reactive index counting module is used for counting reactive indexes of the electrical equipment in the distribution network coordination control area under multiple levels;
the voltage index counting module is used for counting voltage indexes of the electrical equipment in the distribution network coordination control area;
and the running state adjusting module is used for adjusting the running state of the distribution network coordination control area according to the reactive index and the voltage index.
In a third aspect, an embodiment of the present invention further provides a computer device, where the computer device includes:
one or more processors;
a memory for storing one or more programs,
when executed by the one or more processors, cause the one or more processors to implement the automatic voltage control method of the first aspect.
In a fourth aspect, an embodiment of the present invention further provides a computer-readable storage medium, where a computer program is stored, and when the computer program is executed by a processor, the computer program implements the automatic voltage control method according to the first aspect.
In this embodiment, the electrical devices located in the preset area are queried in the power distribution network to construct a distribution network coordination control area, the reactive indexes of the electrical devices in the distribution network coordination control area are counted at multiple levels, the voltage indexes of the electrical devices in the distribution network coordination control area are counted, and the running state of the distribution network coordination control area is adjusted according to the reactive indexes and the voltage indexes, so that the granularity of evaluation under automatic voltage control is reduced, the dimensionality of evaluation of the reactive indexes is increased, the comprehensiveness of a control strategy is ensured, and the efficiency of automatic voltage control is improved.
Drawings
Fig. 1 is a flowchart of an automatic voltage control method according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a power distribution network according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an automatic voltage control apparatus according to a second embodiment of the present invention;
fig. 4 is a schematic structural diagram of a computer device according to a third embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Example one
Fig. 1 is a flowchart of an automatic voltage control method according to an embodiment of the present invention, where the embodiment is applicable to a case where automatic voltage control is performed at a fine granularity, the method may be performed by an automatic voltage control apparatus, the automatic voltage control apparatus may be implemented by software and/or hardware, and may be configured in a computer device, such as a server, a workstation, a personal computer, and the like, and specifically includes the following steps:
step 101, inquiring electrical equipment in a preset area in a power distribution network to construct a distribution network coordination control area.
In an electric power system, the system is generally divided into an extra-high voltage power grid, a transmission network, a power supply network and a power distribution network, wherein the extra-high voltage power grid comprises 750kV, 500kV, 330kV and 220kV, and forms a framework of a large-area power grid and a connecting line between the large-area power grids; the power transmission network comprises 220kV and 110kV, forms a complex power transmission network and transmits electric energy among various regions; the power supply network comprises 110kV, 66kV and 35kV, and the power is transmitted to a local transformer substation close to the load area by a hub transformer substation; the power distribution network comprises 10kV and 380V domestic power, and a local substation transmits power to a distribution transformer or a distribution room in a residential area.
The control object (power equipment) of the distribution network AVC master station comprises a 10kV capacitor and a voltage regulator which are carried by a 10kV distribution network line; a 10kV grid-connected new energy power station and a small hydropower station; and a capacitor at the station-to-low voltage side and a distributed power supply (a roof photovoltaic, an energy storage battery and the like) connected with the 380V grid at the access station-to-low voltage side. The 10kV grid-connected new energy power station is controlled by issuing voltage reactive power of a grid-connected point to an AVC substation; capacitors on the low-voltage side of the station transformer, distributed power supplies connected to the 380V grid on the low-voltage side of the access station, and the like are controlled by an AVC substation disposed in the station transformer. The distribution network is mostly operated by radiation, namely 1 or several 10kV lines of 110kV and 35kV transformer substations bring out a plurality of 10kV distribution network feeders and station transformers, and different 10kV outgoing lines (groups) are operated by open loops without direct electrical connection.
When the control period comes, the model of the power grid of the designated area is obtained from the power grid energy management system, and the model of the power distribution network is obtained from the distribution point automation system, so that a basic calculation control unit, namely a distribution network coordination control area, of the distribution network AVC is generated.
Illustratively, starting from a 10kV bus, a distribution network coordination control area is formed by an area carried by a 10kV outgoing line (group), and the coordination control area is formed
Figure BDA0003361360900000041
Expressed as:
Figure BDA0003361360900000042
wherein:
Figure BDA0003361360900000051
the power source node represents 10kV buses, 1 or a plurality of buses running in parallel, namely the regional power source root node, belongs to a 110kV or 35kV transformer substation, and the total number is N.
Figure BDA0003361360900000052
A plurality of lines representing a 10kV outlet, 1 or closed loop operation, i.e. lines connected to a 10kV bus, which belongs to a certain 10kV bus for a total of M.
Figure BDA0003361360900000053
The 10kV line segment is shown, a plurality of 10kV distribution network feeder line segments connected from a 10kV outgoing line are connected with the head end and the tail end of the 10kV distribution network feeder line segments to a superior 10kV line or other line segments, and H lines are counted.
Figure BDA0003361360900000054
Representing a 10kV capacitor, a reactive compensation capacitor connected on a 10kV line segment, whose end points are connected to a certain 10kV line segment node, for a total of J stations.
Figure BDA0003361360900000055
Represents a 10kV reactor connected toAnd the end points of the reactive compensation reactors on the 10kV line section are connected to a certain 10kV line section node, and F stations are counted.
Figure BDA0003361360900000056
The 10kV voltage regulator is shown, the voltage regulator connected on the 10kV line segment is connected with the 10kV line segment node at the head end and the tail end, and K stations are represented.
Figure BDA0003361360900000057
The 10kV grid-connected new energy power station is represented, the 10kV grid-connected new energy power station serves as an adjustable equivalent generator in a distribution network, the end point of the adjustable equivalent generator is connected to a certain 10kV line section node, and P seats are summed.
Figure BDA0003361360900000058
The transformer area transformer represents a 10kV transformer and is connected to a 10kV line section, a high-voltage side winding of the transformer area transformer is connected to a certain 10kV line section node, a low-voltage side of the transformer area transformer is connected with a load or distributed adjustable reactive resources, and the total number of the transformer area transformers is 0.
Figure BDA0003361360900000059
Represents a 0.4kV load, is connected to the low-voltage side of the transformer in the transformer area, and has a total of W stations.
In one example, as shown in fig. 2, a substation of 110KV on the left side and a substation of 35KV on the right side generate a distribution network coordination control area for the substation on the left side
Figure BDA00033613609000000510
The following were used:
Bus1(Bus2)-L1-C1-S1-R1-G1-S2-T1
Bus2(Bus1)-L2-C2-S3-R2-G2-S4-T2
generation of distribution network coordination control area for right-side transformer substation
Figure BDA00033613609000000511
The following were used:
Bus3-L3-C3-S5-R3-G3-S6-T3
and 102, counting reactive indexes of the electrical equipment in the distribution network coordination control area under multiple levels.
In this embodiment, the reactive indexes may be set in advance for the electrical devices in the distribution network coordination control area at multiple levels, so-called levels, where the reactive index at the level may be obtained by performing combined operation on the reactive indexes at the previous level, and the reactive indexes are classified into levels, so that not only the diversity of the features can be improved, but also the depth of the features can be improved.
And initializing the reactive indexes, setting part or all of the reactive indexes to be 0, and counting the reactive indexes of the electrical equipment in the distribution network coordination control area at multiple levels when the distribution network coordination control area runs.
In one embodiment of the present invention, step 102 may include the steps of:
and 1021, respectively counting the reactive indexes of the electrical equipment in the distribution network coordination control area under the reactive power supply, the reactive exchange, the reactive load and the reactive loss.
In this embodiment, one or more reactive indexes under a reactive power supply, reactive power exchange, reactive load, and reactive loss may be counted for the electrical devices in the distribution network coordination control area, respectively, as primary reactive indexes.
In a specific implementation, the primary reactive index is processed in the following manner:
1. reactive power supply
1.1 for lines
Charging reactive power is inquired for each line in distribution network coordination control area
Figure BDA0003361360900000061
Reactive charging all lines
Figure BDA0003361360900000062
Summing to obtain the total charging reactive power of all lines in the distribution network coordination control area
Figure BDA0003361360900000063
Namely, it is
Figure BDA0003361360900000064
1.2 for capacitors
Respectively inquiring rated capacity of each capacitor in distribution network coordination control area
Figure BDA0003361360900000065
Rated power for all capacitors
Figure BDA0003361360900000071
Summing to obtain the total reactive power configuration of all the capacitors in the distribution network coordination control area
Figure BDA0003361360900000072
That is to say that the first and second electrodes,
Figure BDA0003361360900000073
amount of reactive power to all capacitors currently in operation
Figure BDA0003361360900000074
Measuring and summing to obtain the reactive power input of all the capacitors currently running in the distribution network coordination control area
Figure BDA0003361360900000075
That is to say that the first and second electrodes,
Figure BDA0003361360900000076
where J 'is the currently operating capacitor, totaling J's.
Calculating the input reactive power of all capacitors
Figure BDA0003361360900000077
Total arrangement reactive with all capacitors
Figure BDA0003361360900000078
The ratio of the first to the second as the input rate of the capacitor
Figure BDA0003361360900000079
That is to say that the first and second electrodes,
Figure BDA00033613609000000710
1.3 for reactor
Respectively inquiring rated capacity of each reactor in distribution network coordination control area
Figure BDA00033613609000000711
Rated capacity for all reactors
Figure BDA00033613609000000712
Summing to obtain the total reactive power configuration of all reactors in the distribution network coordination control area
Figure BDA00033613609000000713
That is to say that the temperature of the molten steel,
Figure BDA00033613609000000714
reactive power measurement of all reactors currently in operation
Figure BDA00033613609000000715
Summing to obtain the reactive power input of all the reactors currently running in the distribution network coordination control area
Figure BDA00033613609000000716
That is to say that the first and second electrodes,
Figure BDA00033613609000000717
wherein F 'is the reactor in current operation, and the total F' is the platform.
Calculating the input reactive power of all reactors
Figure BDA00033613609000000718
Total reactive configuration with all reactors
Figure BDA00033613609000000719
The ratio of the above-mentioned components is used as the input rate of the reactor
Figure BDA00033613609000000720
That is to say that the first and second electrodes,
Figure BDA00033613609000000721
1.4 aiming at new energy power station
Inquiring current reactive power output of each grid-connected new energy power station in distribution network coordination control area
Figure BDA00033613609000000722
Maximum delayed phase reactive power
Figure BDA00033613609000000723
Maximum phase advance reactive power
Figure BDA00033613609000000724
Maximum delayed phase reactive power of all new energy power stations
Figure BDA00033613609000000725
Summing to obtain the total delayed phase reactive power of all new energy power stations in the distribution network coordination control area
Figure BDA0003361360900000081
That is to say that the first and second electrodes,
Figure BDA0003361360900000082
maximum phase advance reactive power for all new energy power stations
Figure BDA0003361360900000083
Summing to obtain total phase-advancing reactive power of all new energy power stations in the distribution network coordination control area
Figure BDA0003361360900000084
That is to say that the first and second electrodes,
Figure BDA0003361360900000085
reactive power output to all new energy power stations
Figure BDA0003361360900000086
Summing to obtain the total reactive output of all new energy power stations in the distribution network coordination control area
Figure BDA0003361360900000087
That is to say that the first and second electrodes,
Figure BDA0003361360900000088
if total reactive power output
Figure BDA0003361360900000089
If the total reactive power is greater than or equal to 0, the total reactive power output is calculated
Figure BDA00033613609000000810
Reactive with total slow phase
Figure BDA00033613609000000811
The ratio of the two is used as the input rate of a new energy power station
Figure BDA00033613609000000812
Or, if total reactive power output
Figure BDA00033613609000000813
If less than 0, the total reactive power output is calculated
Figure BDA00033613609000000814
Reactive with total phase advance
Figure BDA00033613609000000815
The ratio of the new energy to the new energy is used as the input rate of the new energy power station
Figure BDA00033613609000000816
That is to say that the first and second electrodes,
Figure BDA00033613609000000817
2. reactive power exchange
2.1 for the upper-level network
Respectively inquiring each outgoing line connected with a bus of a transformer substation in a distribution network coordination control area for reactive power switching qmReactive exchange q for all outgoing linesmSumming to obtain the reactive power exchange between the coordinated control area of the distribution network and the superior power grid
Figure BDA00033613609000000818
That is to say that the temperature of the molten steel,
Figure BDA00033613609000000819
2.2 coordinating control area for distribution network with outside
Respectively inquiring each power transmission line connected with an external distribution network coordination control area in a distribution network coordination control area for reactive power switching qh′Reactive power exchange q for all transmission linesh′Summing to obtain the reactive power exchange between the distribution network coordination control area and the external distribution network coordination control area
Figure BDA00033613609000000820
That is to say that the first and second electrodes,
Figure BDA00033613609000000821
3. reactive load
Querying each electrical device in a distribution network coordinated control area for a reactive load qwSumming the reactive loads of all the electrical equipment to obtain the total reactive load of all the electrical equipment in the distribution network coordination control area
Figure BDA00033613609000000822
That is to say that the first and second electrodes,
Figure BDA0003361360900000091
4. reactive power loss
4.1 aiming at power transmission line
Querying each transmission line in distribution network coordination control area for reactive loss
Figure BDA0003361360900000092
Reactive losses to all transmission lines
Figure BDA0003361360900000093
Summing to obtain the reactive loss of the bus line in the distribution network coordination control area
Figure BDA0003361360900000094
That is to say that the first and second electrodes,
Figure BDA0003361360900000095
4.2 for main transformer
Querying each main transformer in distribution network coordination control area for reactive loss
Figure BDA0003361360900000096
Reactive loss to all main transformers
Figure BDA0003361360900000097
Summing to obtain the reactive loss of all main transformers in the distribution network coordination control area
Figure BDA0003361360900000098
Figure BDA0003361360900000099
And 1022, performing combined operation on at least two reactive indexes in the reactive power supply, reactive exchange, reactive load and reactive loss to obtain reactive indexes under capacitive reactive power and inductive reactive power.
In this embodiment, at least two reactive indexes of the reactive power source, the reactive power exchange, the reactive load, and the reactive loss may be combined to obtain one or more reactive indexes under capacitive reactive power and inductive reactive power as the secondary reactive indexes.
In a specific implementation, the secondary reactive index is processed as follows:
1. capacitive reactive
Total charging reactive to all lines
Figure BDA00033613609000000910
Total configuration reactive power of capacitor
Figure BDA00033613609000000911
Total slow phase reactive power of new energy power station
Figure BDA00033613609000000912
Summing to obtain regional capacitive reactive resources of the distribution network coordination control area
Figure BDA00033613609000000913
That is to say that the first and second electrodes,
Figure BDA00033613609000000914
reactive power loss to the bus line
Figure BDA00033613609000000915
Reactive loss of all main transformers
Figure BDA00033613609000000916
First variable
Figure BDA00033613609000000917
Second variable
Figure BDA00033613609000000918
Negative value of (3), third variable
Figure BDA00033613609000000919
Summing to obtain the regional capacitive reactive power requirement of the distribution network coordination control area
Figure BDA0003361360900000101
Wherein if the total reactive load of all electrical devices
Figure BDA0003361360900000102
Greater than 0, the first variable
Figure BDA0003361360900000103
For the total reactive load of all electrical equipment
Figure BDA0003361360900000104
If the total reactive load of all electrical equipment
Figure BDA0003361360900000105
Less than or equal to 0, then the first variable
Figure BDA0003361360900000106
Is 0.
If reactive exchange with the higher-level network
Figure BDA0003361360900000107
Less than 0, then the second variable
Figure BDA0003361360900000108
For reactive exchange with a superordinate network
Figure BDA0003361360900000109
If reactive exchange with the higher-level network
Figure BDA00033613609000001010
Greater than or equal to 0, then the second variable
Figure BDA00033613609000001011
Is 0.
If the reactive power exchange with the external distribution network coordination control area
Figure BDA00033613609000001012
Greater than 0, then the third variable
Figure BDA00033613609000001013
Reactive power switching for coordinating control areas with external distribution networks
Figure BDA00033613609000001014
If the reactive power exchange with the external distribution network coordination control area
Figure BDA00033613609000001015
Less than or equal to 0, then the third variable
Figure BDA00033613609000001016
Is 0.
That is to say that the temperature of the molten steel,
Figure BDA00033613609000001017
Figure BDA00033613609000001018
Figure BDA00033613609000001019
Figure BDA00033613609000001020
computing regional capacitive reactive resources
Figure BDA00033613609000001021
Reactive requirement for regional compatibility
Figure BDA00033613609000001022
The ratio of the first to the second is used for obtaining the regional capacitive reactive balance rate of the distribution network coordination control area
Figure BDA00033613609000001023
That is to say that the temperature of the molten steel,
Figure BDA00033613609000001024
2. inductive reactive power
Total configuration reactive power to reactor
Figure BDA00033613609000001025
Negative value of (1), total phase-advancing reactive power of all new energy power stations
Figure BDA00033613609000001026
Negative value of (3), reactive loss of the total line
Figure BDA00033613609000001027
Reactive loss of all main transformers
Figure BDA00033613609000001028
Summing to obtain the regional inductive reactive resources of the distribution network coordination control area
Figure BDA00033613609000001029
That is to say that the first and second electrodes,
Figure BDA00033613609000001030
Figure BDA00033613609000001031
total charging reactive to all lines
Figure BDA0003361360900000111
Fourth variable
Figure BDA0003361360900000112
The fifth variable
Figure BDA0003361360900000113
Negative value of (1), sixth variable
Figure BDA0003361360900000114
Summing to obtain the regional inductive reactive power requirement of the distribution network coordination control area
Figure BDA0003361360900000115
Wherein if the total reactive load of all electrical devices
Figure BDA0003361360900000116
Less than 0, the fourth variable
Figure BDA0003361360900000117
For the total reactive load of all electrical equipment
Figure BDA0003361360900000118
If the total reactive load of all electrical devices is negative
Figure BDA0003361360900000119
Greater than or equal to 0, then the fourth variable
Figure BDA00033613609000001110
Is 0;
if reactive exchange with the higher-level network
Figure BDA00033613609000001111
Greater than 0, then the fifth variable
Figure BDA00033613609000001112
For reactive exchange with a superordinate network
Figure BDA00033613609000001113
Negative value of (1), if reactive exchange with the superordinate network
Figure BDA00033613609000001114
Less than or equal to 0, then the fifth variable
Figure BDA00033613609000001115
Is 0;
if the reactive power exchange with the external distribution network coordination control area
Figure BDA00033613609000001116
Less than 0, the sixth variable
Figure BDA00033613609000001117
Reactive power switching for coordinating control areas with external distribution networks
Figure BDA00033613609000001118
Negative value of (1), if reactive exchange with external distribution network coordination control area
Figure BDA00033613609000001119
Greater than or equal to 0, then the sixth variable
Figure BDA00033613609000001120
Is 0.
That is to say that the first and second electrodes,
Figure BDA00033613609000001121
Figure BDA00033613609000001122
Figure BDA00033613609000001123
Figure BDA00033613609000001124
computing regional perceptual reactive resources
Figure BDA00033613609000001125
And regional perceptual reactive demand
Figure BDA00033613609000001126
Obtaining the regional inductive reactive power balance rate of the distribution network coordination control area
Figure BDA00033613609000001127
That is to say that the first and second electrodes,
Figure BDA00033613609000001128
and 103, counting voltage indexes of the electrical equipment in the distribution network coordination control area.
In this embodiment, voltage indexes may be set in advance for the electrical devices in the distribution network coordination control area, the voltage indexes are initialized to 0, and when the distribution network coordination control area operates, the voltage indexes are counted for the electrical devices in the distribution network coordination control area.
In particular implementations, a first number of electrical devices in a coordinated control area of a distribution network is counted
Figure BDA0003361360900000121
Wherein each electrical device has a voltage value V.
The statistical voltage value V is greater than or equal to the upper limit value VHigh(i.e., V.gtoreq.V)High) Of electrical equipment
Figure BDA0003361360900000122
The statistical voltage value V is smaller than the upper limit value VHighAnd is less than or equal to the upper limit value VHighMinus a first threshold value fOf nerahDifference (i.e. V)High-fNearH≤V＜VHighIndicating that the voltage value V is close to the upper limit value VHigh) Of electrical devices
Figure BDA00033613609000001221
The statistical voltage value V is less than or equal to the lower limit value VLow(i.e., V < V)Low) Fourth number of electrical devices
Figure BDA0003361360900000123
The statistical voltage value V is greater than the lower limit value VLowAnd is less than or equal to the lower limit value VLowPlus a second threshold fNearLSum of (i.e., V)Low+fNearL≤V＜VLowIndicating that the voltage value V is close to the lower limit value VLow) Of electrical equipment
Figure BDA0003361360900000124
Calculating a second quantity
Figure BDA0003361360900000125
And a first number
Figure BDA0003361360900000126
As a first probability of the electrical equipment exceeding the upper limit
Figure BDA0003361360900000127
That is to say that the temperature of the molten steel,
Figure BDA0003361360900000128
calculating the third quantity
Figure BDA0003361360900000129
And a first number
Figure BDA00033613609000001210
As a second probability that the electrical device is approaching the upper limit
Figure BDA00033613609000001211
That is to say that the first and second electrodes,
Figure BDA00033613609000001212
calculating the fourth quantity
Figure BDA00033613609000001213
And a first number
Figure BDA00033613609000001214
As a third probability of the lower limit of the electrical equipment
Figure BDA00033613609000001215
That is to say that the first and second electrodes,
Figure BDA00033613609000001216
calculating the fifth quantity
Figure BDA00033613609000001217
And a first number
Figure BDA00033613609000001218
As a fourth probability that the electrical device approaches the lower limit
Figure BDA00033613609000001219
That is to say that the first and second electrodes,
Figure BDA00033613609000001220
and 104, adjusting the running state of the distribution network coordination control area according to the reactive index and the voltage index.
The basic principle of automatic voltage control is to realize reasonable distribution of reactive voltage in a power grid by coordinately controlling reactive power output of a generator, a transformer tap and reactive power compensation electric equipment. The control of the voltage and the reactive power of the power system is a very effective measure which is related to the guarantee of the power supply quality, the satisfaction of the reactive power requirement of a user and the stability of the system voltage, and simultaneously, the reduction of the line loss and the improvement of the operation economy of a power grid.
With the continuous development and growth of the power industry, reactive power optimization has also become a key research object for the control and operation of power systems. Under the condition of the electric power market, the quality of the power supply voltage is one of important indexes of the electric energy quality of the electric power system, and the quality of the power supply voltage mainly depends on whether the reactive power flow distribution of the electric power system is reasonable or not, so that reactive power optimization is an effective means for reasonably distributing the reactive power flow of the electric power system and ensuring the safe and economic operation of the system. The reactive power optimization refers to a reactive power regulation method which optimizes certain control variables under the condition of given system structure parameters and loads and enables one or more performance indexes of a system to achieve the optimal condition under certain constraint conditions.
The reactive power optimization of the power system can reasonably use a voltage reactive power regulation means, enhance the regulation and control capability of voltage reactive power, improve the qualification rate of the power grid voltage to ensure the quality of electric energy, and enable the operation indexes of the power department and the overall equipment of users to reach the optimal state.
On the premise of safe and stable operation of an electric power system, a reactive power voltage regulating system of a regional power grid performs voltage reactive power comprehensive control with the aim of improving voltage reactive power qualification and power grid operation economy, so that regional high-level operation and reactive layered and partitioned local balance are realized as far as possible.
Therefore, in the embodiment, the control effect of the reactive power system is evaluated by combining the reactive power index and the voltage index, the control strategy is modified according to the evaluation result, and the running state of the distribution network coordination control area is adjusted.
In one embodiment of the present invention, step 104 may include the steps of:
step 1041, building a node using one or more conditions.
Step 1042, traversing the reactive index and the voltage index sequentially through the conditions in the nodes to determine a mode of adjusting the running state of the distribution network coordination control area.
And 1043, adjusting the running state of the distribution network coordination control area according to the mode.
In this embodiment, according to the specification of automatic voltage control, conditions may be set for the reactive power indicator and the voltage indicator, one or more conditions may be used to construct nodes, and the nodes may be used to establish an ordered link according to a logical relationship, where each node points to a next node on the link or adjusts a mode of an operating state of the distribution network coordination control area.
And traversing the reactive indexes and the voltage indexes according to the sequence of the links to the end to obtain a mode of adjusting the running state of the distribution network coordination control area, so as to execute the mode and realize the adjustment of the running state of the distribution network coordination control area.
In a specific implementation, the process of traversing nodes in a link is as follows, where S1-S8 each represent a node:
s1, detecting the voltage index of the electric device (checking whether the voltage is higher than the upper limit/lower limit or close to the upper limit/lower limit), including:
s1.1, judging the first probability of the electrical equipment exceeding the upper limit
Figure BDA0003361360900000141
Whether or not it is larger than the threshold value XOverHDoor(i.e., the amount of the acid,
Figure BDA0003361360900000142
) Or a second probability that the electrical device is close to the upper limit
Figure BDA0003361360900000143
Whether or not it is greater than or close to the upper limit threshold value XNearHDoor(i.e., the amount of the acid,
Figure BDA0003361360900000144
) (ii) a If yes, go to S3.
S1.2, judging the third probability of the lower limit of the electrical equipment
Figure BDA0003361360900000145
Whether or not it is larger than threshold value XOverLDoor(i.e., the amount of the acid,
Figure BDA0003361360900000146
) Or a fourth probability that the electric device approaches the lower limit
Figure BDA0003361360900000147
Whether or not it is greater than or close to the lower limit threshold value XNearLDoor(i.e., the amount of the acid,
Figure BDA0003361360900000148
) (ii) a If yes, go to S5.
S2, detecting reactive power exchange between the electrical equipment and the superior power grid, including:
s2.1, judging reactive power exchange with a superior power grid
Figure BDA0003361360900000149
Whether it is less than the first idle threshold value Er(i.e., the ratio of,
Figure BDA00033613609000001410
) First idle threshold value ErWhen the reactive power is less than 0, the reactive power is sent to the upper-level power grid in the distribution network coordination control area; if yes, go to S3.
S2.2, judging reactive power exchange with a superior power grid
Figure BDA0003361360900000151
Whether it is greater than the second reactive threshold value Ec(i.e., the amount of the acid,
Figure BDA0003361360900000152
) Second reactive threshold value EcIf the voltage is more than 0, the distribution network coordinated control area absorbs reactive power to the upper-level power grid; if yes, go to S5.
S3, carrying out first detection on capacitive reactive input of the electrical equipment, wherein the first detection comprises the following steps:
s3.1, judging the input rate of the capacitor
Figure BDA0003361360900000153
Whether the input rate of the new energy power station is more than 0 or not, or whether the input rate of the new energy power station is simultaneously met
Figure BDA0003361360900000154
Greater than 0, total reactive power output of all new energy power stations
Figure BDA0003361360900000155
Is greater than 0 (i.e.,
Figure BDA0003361360900000156
alternatively, the first and second electrodes may be,
Figure BDA0003361360900000157
) If yes, the controllable capacitor can be cut off or the delay of the controllable new energy power station is reduced, namely the capacitor is put into the current operation state or the new energy power station generates delayed reactive powerPhase reactive power output (a mode for adjusting the running state of a distribution network coordination control area).
S3.2, judging the input rate of the capacitor
Figure BDA0003361360900000158
Whether or not it is equal to 0 and the total reactive power output of all new energy power stations
Figure BDA0003361360900000159
Whether or not it is less than or equal to 0 (i.e.,
Figure BDA00033613609000001510
) If yes, it indicates that the capacitor is not put into the current operation state or the new energy power station does not generate the delayed phase reactive power, then S4 is executed.
S4, the first detecting the inductive reactive input of the electrical device includes:
s4.1, judging trix input of reactor
Figure BDA00033613609000001511
Whether or not it is less than inductive reactive reserve coefficient Kr1Or, the input rate of the new energy power station
Figure BDA00033613609000001512
Less than phase advance reactive rotation reserve coefficient Kr2(i.e., the amount of the acid,
Figure BDA00033613609000001513
alternatively, the first and second electrodes may be,
Figure BDA00033613609000001514
) If yes, the reactor is not put into the current operation state or the new energy power station can send out the phase-entering reactive power, and then the controllable reactor is put into the current operation state or the controllable phase-entering reactive power output of the new energy power station is added (the operation state of the distribution network coordination control area is adjusted).
S4.2, judging the input rate of the reactor
Figure BDA00033613609000001515
Whether or not it is 1, and the input rate of the new energy power station
Figure BDA00033613609000001516
Whether the total reactive power output of all new energy power stations is equal to 1 or not
Figure BDA00033613609000001517
Less than 0 (i.e.,
Figure BDA00033613609000001518
Figure BDA00033613609000001519
) (ii) a If yes, go to S7.
S5, performing a second detection of the inductive reactive input of the electrical device, including:
s5.1, judging the input rate of the reactor
Figure BDA0003361360900000161
Whether the input rate of the new energy power station is more than 0 or not, or whether the input rate of the new energy power station is simultaneously met
Figure BDA0003361360900000162
Greater than 0, total reactive power output of all new energy power stations
Figure BDA0003361360900000163
Less than 0 (i.e.,
Figure BDA0003361360900000164
alternatively, the first and second electrodes may be,
Figure BDA0003361360900000165
) (ii) a If yes, the reactor is switched into the current operation state or the new energy power station can send out the phase-in reactive power, the controllable reactor is cut off or the phase-in reactive power output of the controllable new energy power station is reduced (the operation state of the distribution network coordination control area is adjusted).
S5.2, judging the input rate of the reactor
Figure BDA0003361360900000166
Whether or not to equal 0, or the total reactive power output of all new energy power stations
Figure BDA0003361360900000167
Whether or not it is greater than or equal to 0 (i.e.,
Figure BDA0003361360900000168
alternatively, the first and second electrodes may be,
Figure BDA0003361360900000169
) (ii) a If yes, the reactor is not put into the current operation state or the new energy power station does not send out phase-entering reactive power, and S6 is executed.
S6, carrying out second detection on the capacitive reactive input of the electrical equipment, wherein the second detection comprises the following steps:
s6.1, judging the input rate of the capacitor
Figure BDA00033613609000001610
Whether the capacity reactive reserve coefficient Kc1 is less than or equal to or not, or the input rate of the new energy power station
Figure BDA00033613609000001611
Less than the late-phase reactive rotation back-up coefficient Kc2 (i.e.,
Figure BDA00033613609000001612
alternatively, the first and second electrodes may be,
Figure BDA00033613609000001613
) (ii) a If the current operation state indicates that a capacitor is not put in or the new energy power station can send out the delayed phase reactive power, putting in the controllable capacitor or increasing the delayed phase reactive power output of the controllable new energy power station (adjusting the operation state of the distribution network coordination control area), and processing the next distribution network coordination control area until all the distribution network coordination control areas are processed.
S6.2, judging the input rate of the capacitor
Figure BDA00033613609000001614
Whether or not 1 is satisfied, and the input rate of the new energy power station
Figure BDA00033613609000001615
Equal to 1, total reactive power output of all new energy power stations
Figure BDA00033613609000001616
Whether or not it is greater than 0 (i.e.,
Figure BDA00033613609000001617
Figure BDA00033613609000001618
) (ii) a If yes, it indicates that the capacitor is fully put into the current operation state or the new energy power station has reached the maximum delayed phase reactive power, then S8 is executed.
S7, judging the inductive reactive power balance rate of the region of the distribution network coordination control area
Figure BDA00033613609000001619
Whether the power is less than the margin coefficient X of the inductive reactive power resourcer0(i.e., the amount of the acid,
Figure BDA00033613609000001620
) (ii) a If so, determining that the inductive reactive resources in the region are insufficient and no available mode is available for adjusting the running state of the distribution network coordination control area, and processing the next distribution network coordination control area until all the distribution network coordination control areas are processed; and if not, determining that no available mode is available for adjusting the running state of the distribution network coordination control area, and processing the next distribution network coordination control area until all the distribution network coordination control areas are processed.
S8, judging the regional capacitive reactive power balance rate of the distribution network coordination control area
Figure BDA0003361360900000171
Whether the margin coefficient is less than the margin coefficient X of the capacitive reactive resourcec0(i.e., the ratio of,
Figure BDA0003361360900000172
) (ii) a If so, determining that the regional capacitive reactive resources are insufficient and no available mode is available for adjusting the running state of the distribution network coordination control area, and processing the next distribution network coordination control area until all the distribution network coordination control areas are processed; and if not, determining that no available mode is available for adjusting the running state of the distribution network coordination control area, and processing the next distribution network coordination control area until all the distribution network coordination control areas are processed.
In the embodiment, a set of evaluation index system is established to comprehensively evaluate the reactive power control effect of the system, so that the voltage reactive power running state can be comprehensively evaluated, and the reason for unreasonable running state can be tracked, thereby providing reference basis for the running parameter setting, control strategy optimization and compensation capacity configuration of the actual system.
In this embodiment, the electrical devices located in the preset area are queried in the power distribution network to construct a distribution network coordination control area, the reactive indexes of the electrical devices in the distribution network coordination control area are counted at multiple levels, the voltage indexes of the electrical devices in the distribution network coordination control area are counted, and the running state of the distribution network coordination control area is adjusted according to the reactive indexes and the voltage indexes, so that the granularity of evaluation under automatic voltage control is reduced, the dimensionality of evaluation of the reactive indexes is increased, the comprehensiveness of a control strategy is ensured, and the efficiency of automatic voltage control is improved.
It should be noted that, for simplicity of description, the method embodiments are described as a series of acts or combination of acts, but those skilled in the art will recognize that the present invention is not limited by the illustrated order of acts, as some steps may occur in other orders or concurrently in accordance with the embodiments of the present invention. Further, those skilled in the art will appreciate that the embodiments described in the specification are presently preferred and that no particular act is required to implement the invention.
Example two
Fig. 3 is a block diagram of an automatic voltage control apparatus according to a second embodiment of the present invention, which may specifically include the following modules:
the control area building module 301 is configured to query electrical devices located in a preset area in the power distribution network to build a distribution network coordination control area;
a reactive index statistics module 302, configured to count a reactive index for the electrical device in the distribution network coordination control area at multiple levels;
a voltage index statistics module 303, configured to count a voltage index for the electrical device in the distribution network coordination control area;
and an operation state adjusting module 304, configured to adjust an operation state of the distribution network coordination control area according to the reactive index and the voltage index.
In an embodiment of the present invention, the reactive power indicator statistic module 302 is further configured to:
respectively counting reactive indexes of the electrical equipment in the distribution network coordination control area under reactive power supply, reactive power exchange, reactive load and reactive loss;
and performing combined operation on at least two reactive indexes in the reactive power supply, the reactive exchange, the reactive load and the reactive loss to obtain reactive indexes under capacitive reactive and inductive reactive conditions.
In an embodiment of the present invention, the reactive power indicator statistic module 302 is further configured to:
inquiring charging reactive power of each line in the distribution network coordination control area respectively;
summing the charging reactive power of all the lines to obtain the total charging reactive power of all the lines in the distribution network coordination control area;
respectively inquiring rated capacity of each capacitor in the distribution network coordination control area;
summing the rated power of all the capacitors to obtain the total configuration reactive power of all the capacitors in the distribution network coordination control area;
summing the reactive power measurements of all the capacitors currently running to obtain the input reactive power of all the capacitors currently running in the distribution network coordination control area;
calculating the ratio of the input reactive power of all the capacitors to the total configuration reactive power of all the capacitors to be used as the input rate of the capacitors;
respectively inquiring rated capacity of each reactor in the distribution network coordination control area;
summing the rated capacities of all the reactors to obtain the total configuration reactive power of all the reactors in the distribution network coordination control area;
summing the reactive power measurements of all the reactors in current operation to obtain the input reactive power of all the reactors in current operation in the distribution network coordination control area;
calculating the ratio of the input reactive power of all the reactors to the total configuration reactive power of all the reactors to be used as the input rate of the reactors;
inquiring reactive power output, maximum slow-phase reactive power and maximum incoming phase reactive power of each grid-connected new energy power station in the distribution network coordination control area;
summing the maximum delayed reactive power of all the new energy power stations to obtain total delayed reactive power of all the new energy power stations in the distribution network coordination control area;
summing the maximum phase-entering reactive power of all the new energy power stations to obtain the total phase-entering reactive power of all the new energy power stations in the distribution network coordination control area;
summing the reactive power outputs of all the new energy power stations to obtain the total reactive power output of all the new energy power stations in the distribution network coordination control area;
if the total reactive power output is greater than or equal to 0, calculating a ratio between the total reactive power output and the total delayed phase reactive power as an input rate of the new energy power station, or if the total reactive power output is less than 0, calculating a ratio between the total reactive power output and the total advanced phase reactive power as an input rate of the new energy power station;
respectively inquiring reactive power switching of each outgoing line connected with a bus of a transformer substation in the distribution network coordination control area;
summing the reactive power exchanges of all the outgoing lines to obtain the reactive power exchanges between the distribution network coordination control area and a superior power grid;
respectively inquiring reactive power exchange of each power transmission line connected with an external distribution network coordination control area in the distribution network coordination control area;
summing the reactive power exchanges of all the power transmission lines to obtain the reactive power exchanges between the distribution network coordination control area and an external distribution network coordination control area;
inquiring each electrical device in the distribution network coordination control area about reactive load;
summing the reactive loads of all the electrical equipment to obtain the total reactive load of all the electrical equipment in the distribution network coordination control area;
inquiring each transmission line in the distribution network coordination control area for reactive loss;
summing the reactive losses of all the power transmission lines to obtain the reactive loss of a bus line in the distribution network coordination control area;
inquiring each main transformer in the distribution network coordination control area about reactive loss;
and summing the reactive losses of all the main transformers to obtain the reactive losses of all the main transformers in the distribution network coordination control area.
In an embodiment of the present invention, the reactive power indicator statistic module 302 is further configured to:
summing the reactive loss of the bus line, the reactive losses of all the main transformers, the negative values of the first variable and the second variable and the third variable to obtain the regional capacitive reactive demand of the distribution network coordination control area;
if the total reactive load of all the electrical equipment is greater than 0, the first variable is the total reactive load of all the electrical equipment, and if the total reactive load of all the electrical equipment is less than or equal to 0, the first variable is 0;
if the reactive power exchange with the superior power grid is less than 0, the second variable is the reactive power exchange with the superior power grid, and if the reactive power exchange with the superior power grid is greater than or equal to 0, the second variable is 0;
if the reactive power exchange with the external distribution network coordination control area is larger than 0, the third variable is the reactive power exchange with the external distribution network coordination control area, and if the reactive power exchange with the external distribution network coordination control area is smaller than or equal to 0, the third variable is 0;
calculating the ratio of the regional capacitive reactive resources to the regional capacitive reactive demand to obtain the regional capacitive reactive balance rate of the distribution network coordination control area;
summing the negative value of the total configuration reactive power of the reactor, the negative values of the total phase-entering reactive power of all the new energy power stations, the reactive power loss of the main line and the reactive power loss of all the main transformers to obtain regional inductive reactive power resources of the distribution network coordination control area;
summing the total charging reactive power, the negative values of the fourth variable and the fifth variable and the sixth variable of all the lines to obtain the regional inductive reactive power demand of the distribution network coordination control area;
if the total reactive load of all the electrical equipment is less than 0, the fourth variable is a negative value of the total reactive load of all the electrical equipment, and if the total reactive load of all the electrical equipment is greater than or equal to 0, the fourth variable is 0;
if the reactive power exchange with the superior power grid is greater than 0, the fifth variable is a negative value of the reactive power exchange with the superior power grid, and if the reactive power exchange with the superior power grid is less than or equal to 0, the fifth variable is 0;
if the reactive power exchange with the external distribution network coordination control area is less than 0, the sixth variable is a negative value of the reactive power exchange with the external distribution network coordination control area, and if the reactive power exchange with the external distribution network coordination control area is greater than or equal to 0, the sixth variable is 0;
and calculating the ratio of the regional inductive reactive resources to the regional inductive reactive requirements to obtain the regional inductive reactive balance rate of the distribution network coordination control region.
In an embodiment of the present invention, the voltage index statistics module 303 is further configured to:
counting a first number of the electrical devices in the distribution network coordinated control area, each of the electrical devices having a voltage value;
counting a second number of the electrical devices of which the voltage value is greater than or equal to an upper limit value;
counting a third number of the electrical devices of which the voltage value is smaller than an upper limit value and is smaller than or equal to a difference value obtained by subtracting a first threshold value from the upper limit value;
counting a fourth number of the electrical devices of which the voltage value is less than or equal to a lower limit value;
counting a fifth number of the electrical devices of which the voltage value is greater than a lower limit value and less than or equal to a sum of the lower limit value and a second threshold value;
calculating a ratio between the second number and the first number as a first probability that the electrical device is over the upper limit;
calculating a ratio between the third number and the first number as a second probability that the electrical device approaches an upper limit;
calculating a ratio between the fourth number and the first number as a third probability that the lower limit of the electrical device is exceeded;
calculating a ratio between the fifth number and the first number as a fourth probability that the electrical device approaches a lower limit. In an embodiment of the present invention, the operation status adjustment module 304 is further configured to:
constructing nodes using one or more conditions, each node pointing to a next node or adjusting a manner of operation state of the distribution network coordination control area;
traversing the reactive index and the voltage index sequentially through the conditions in the nodes to determine a mode of adjusting the running state of the distribution network coordination control area;
and adjusting the running state of the distribution network coordination control area according to the mode.
In an embodiment of the present invention, the operation status adjustment module 304 is further configured to:
s1, detecting the voltage indicator of the electrical device, including:
s1.1, judging whether a first probability that the electrical equipment exceeds an upper limit is larger than an upper limit threshold value or not, or whether a second probability that the electrical equipment approaches the upper limit is larger than an upper limit threshold value or not; if yes, go to S3;
s1.2, judging whether the third probability of the lower limit of the electrical equipment is larger than the threshold value of the lower limit, or whether the fourth probability of the electrical equipment approaching the lower limit is larger than the threshold value of the lower limit; if yes, go to S5;
s2, detecting reactive power exchange between the electrical equipment and a superior power grid, including:
s2.1, judging whether reactive power exchange with a superior power grid is smaller than a first reactive power threshold value, wherein the first reactive power threshold value is smaller than 0; if yes, go to S3;
s2.2, judging whether reactive power exchange with a superior power grid is larger than a second reactive power threshold value, wherein the second reactive power threshold value is larger than 0; if yes, go to S5;
s3, performing a first detection of the capacitive reactive input of the electrical device, including:
s3.1, judging whether the input rate of the capacitor is greater than 0 or not, or whether the input rate of the new energy power station is greater than 0 and the total reactive output of all the new energy power stations is greater than 0 are met, and if yes, cutting off the capacitor or reducing the delayed phase reactive output of the new energy power stations;
s3.2, judging whether the input rate of the capacitor is equal to 0 or not, judging whether the total reactive power output of all the new energy power stations is less than or equal to 0 or not, and if yes, executing S4;
s4, the first detecting the inductive reactive input of the electrical device includes:
s4.1, judging whether the input rate of the reactor is smaller than a sensitive reactive power reserve coefficient or not, or judging whether the input rate of the new energy power station is smaller than a phase-entering reactive power rotation standby coefficient or not, and if so, inputting the reactor or increasing the phase-entering reactive power output of the new energy power station;
s4.2, judging whether the input rate of the reactor is equal to 1 or not, judging whether the input rate of the new energy power station is equal to 1 or not, and judging whether the total reactive power output of all the new energy power stations is less than 0 or not; if yes, go to S7;
s5, performing a second detection of the inductive reactive input of the electrical device, including:
s5.1, judging whether the input rate of the reactor is greater than 0 or not, or whether the input rate of the new energy power station is greater than 0 and the total reactive power output of all the new energy power stations is less than 0 are met; if so, cutting off the reactor or reducing the phase-entering reactive power output of the new energy power station;
s5.2, judging whether the input rate of the reactor is equal to 0 or not, or judging whether the total reactive power output of all the new energy power stations is greater than or equal to 0 or not; if yes, go to S6;
s6, carrying out second detection on the capacitive reactive input of the electrical equipment, wherein the second detection comprises the following steps:
s6.1, judging whether the input rate of the capacitor is smaller than a capacitive reactive power reserve coefficient or not, or judging whether the input rate of the new energy power station is smaller than a slow phase reactive power rotation reserve coefficient or not; if yes, inputting the capacitor or increasing the delayed phase reactive output of the new energy power station;
s6.2, judging whether the input rate of the capacitor is equal to 1 or not, judging whether the input rate of the new energy power station is equal to 1 or not, and judging whether the total reactive power output of all the new energy power stations is greater than 0 or not; if yes, go to S8;
s7, judging whether the inductive reactive power balance rate of the area of the distribution network coordination control area is smaller than an inductive reactive power resource margin coefficient; if so, determining that the inductive reactive resources in the region are insufficient and no available mode is available for adjusting the running state of the distribution network coordination control region; if not, determining that no available mode for adjusting the running state of the distribution network coordination control area exists;
s8, judging whether the regional capacitive reactive power balance rate of the distribution network coordination control area is smaller than a capacitive reactive power resource margin coefficient; if so, determining that the regional capacitive reactive resources are insufficient and no available mode is available for adjusting the running state of the distribution network coordination control region; and if not, determining that no available mode for adjusting the running state of the distribution network coordination control area exists.
The automatic voltage control device provided by the embodiment of the invention can execute the automatic voltage control method provided by any embodiment of the invention, and has corresponding functional modules and beneficial effects of the execution method.
EXAMPLE III
Fig. 4 is a schematic structural diagram of a computer device according to a third embodiment of the present invention. FIG. 4 illustrates a block diagram of an exemplary computer device 12 suitable for use in implementing embodiments of the present invention. The computer device 12 shown in FIG. 4 is only one example and should not bring any limitations to the functionality or scope of use of embodiments of the present invention.
As shown in FIG. 4, computer device 12 is in the form of a general purpose computing device. The components of computer device 12 may include, but are not limited to: one or more processors or processing units 16, a system memory 28, and a bus 18 that couples various system components including the system memory 28 and the processing unit 16.
Bus 18 represents one or more of any of several types of bus structures, including a memory bus or memory controller, a peripheral bus, an accelerated graphics port, and a processor or local bus using any of a variety of bus architectures. By way of example, such architectures include, but are not limited to, Industry Standard Architecture (ISA) bus, micro-channel architecture (MAC) bus, enhanced ISA bus, Video Electronics Standards Association (VESA) local bus, and Peripheral Component Interconnect (PCI) bus.
Computer device 12 typically includes a variety of computer system readable media. Such media may be any available media that is accessible by computer device 12 and includes both volatile and nonvolatile media, removable and non-removable media.
The system memory 28 may include computer system readable media in the form of volatile memory, such as Random Access Memory (RAM)30 and/or cache memory 32. Computer device 12 may further include other removable/non-removable, volatile/nonvolatile computer system storage media. By way of example only, storage system 34 may be used to read from and write to non-removable, nonvolatile magnetic media (not shown in FIG. 4, commonly referred to as a "hard drive"). Although not shown in FIG. 4, a magnetic disk drive for reading from and writing to a removable, nonvolatile magnetic disk (e.g., a "floppy disk") and an optical disk drive for reading from or writing to a removable, nonvolatile optical disk (e.g., a CD-ROM, DVD-ROM, or other optical media) may be provided. In these cases, each drive may be connected to bus 18 by one or more data media interfaces. Memory 28 may include at least one program product having a set (e.g., at least one) of program modules that are configured to carry out the functions of embodiments of the invention.
A program/utility 40 having a set (at least one) of program modules 42 may be stored, for example, in memory 28, such program modules 42 including but not limited to an operating system, one or more application programs, other program modules, and program data, each of which or some combination of which may comprise an implementation of a network environment. Program modules 42 generally carry out the functions and/or methodologies of the described embodiments of the invention.
Computer device 12 may also communicate with one or more external devices 14 (e.g., keyboard, pointing device, display 24, etc.), with one or more devices that enable a user to interact with computer device 12, and/or with any devices (e.g., network card, modem, etc.) that enable computer device 12 to communicate with one or more other computing devices. Such communication may be through an input/output (I/O) interface 22. Also, computer device 12 may communicate with one or more networks (e.g., a Local Area Network (LAN), a Wide Area Network (WAN), and/or a public network such as the Internet) via network adapter 20. As shown, network adapter 20 communicates with the other modules of computer device 12 via bus 18. It should be understood that although not shown in the figures, other hardware and/or software modules may be used in conjunction with computer device 12, including but not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives, and data backup storage systems, among others.
The processing unit 16 executes various functional applications and data processing, such as implementing the automatic voltage control method provided by the embodiment of the present invention, by executing programs stored in the system memory 28.
Example four
A fourth embodiment of the present invention further provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the computer program implements each process of the automatic voltage control method, and can achieve the same technical effect, and in order to avoid repetition, details are not repeated here.
A computer readable storage medium may include, for example, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the foregoing. More specific examples (a non-exhaustive list) of the computer readable storage medium would include the following: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In the context of this document, a computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in some detail by the above embodiments, the invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the invention, and the scope of the invention is determined by the scope of the appended claims.

Claims (10)

1. An automatic voltage control method, comprising:
inquiring electrical equipment in a preset area in the power distribution network to construct a distribution network coordination control area;
counting reactive indexes of the electrical equipment in the distribution network coordination control area under multiple levels;
counting voltage indexes of the electrical equipment in the distribution network coordination control area;
and adjusting the running state of the distribution network coordination control area according to the reactive index and the voltage index.
2. The method of claim 1, wherein the counting reactive indicators at a plurality of levels for the electrical devices in the distribution network coordinated control area comprises:
respectively counting reactive indexes of the electrical equipment in the distribution network coordination control area under reactive power supply, reactive power exchange, reactive load and reactive loss;
and performing combined operation on at least two reactive indexes in the reactive power supply, the reactive exchange, the reactive load and the reactive loss to obtain reactive indexes under capacitive reactive and inductive reactive conditions.
3. The method of claim 2, wherein the step of counting the reactive indicators of the electrical devices in the distribution network coordination control area under reactive power supply, reactive power exchange, reactive load and reactive loss comprises:
inquiring charging reactive power of each line in the distribution network coordination control area respectively;
summing the charging reactive powers of all the lines to obtain the total charging reactive power of all the lines in the distribution network coordination control area;
respectively inquiring rated capacity of each capacitor in the distribution network coordination control area;
summing the rated power of all the capacitors to obtain the total configuration reactive power of all the capacitors in the distribution network coordination control area;
summing the reactive power measurements of all the capacitors currently running to obtain the input reactive power of all the capacitors currently running in the distribution network coordination control area;
calculating the ratio of the input reactive power of all the capacitors to the total configuration reactive power of all the capacitors to be used as the input rate of the capacitors;
respectively inquiring rated capacity of each reactor in the distribution network coordination control area;
summing the rated capacities of all the reactors to obtain the total configuration reactive power of all the reactors in the distribution network coordination control area;
summing the reactive power measurements of all the reactors in current operation to obtain the input reactive power of all the reactors in current operation in the distribution network coordination control area;
calculating the ratio of the input reactive power of all the reactors to the total configuration reactive power of all the reactors to be used as the input rate of the reactors;
inquiring reactive power output, maximum slow-phase reactive power and maximum incoming phase reactive power of each grid-connected new energy power station in the distribution network coordination control area;
summing the maximum delayed reactive power of all the new energy power stations to obtain total delayed reactive power of all the new energy power stations in the distribution network coordination control area;
summing the maximum phase-advancing reactive power of all the new energy power stations to obtain the total phase-advancing reactive power of all the new energy power stations in the distribution network coordination control area;
summing the reactive power outputs of all the new energy power stations to obtain the total reactive power output of all the new energy power stations in the distribution network coordination control area;
if the total reactive power output is greater than or equal to 0, calculating a ratio between the total reactive power output and the total delayed phase reactive power as an input rate of the new energy power station, or if the total reactive power output is less than 0, calculating a ratio between the total reactive power output and the total advanced phase reactive power as an input rate of the new energy power station;
respectively inquiring reactive power switching of each outgoing line connected with a bus of a transformer substation in the distribution network coordination control area;
summing the reactive power exchanges of all the outgoing lines to obtain the reactive power exchanges between the distribution network coordination control area and a superior power grid;
respectively inquiring reactive power exchange of each power transmission line connected with an external distribution network coordination control area in the distribution network coordination control area;
summing the reactive power exchanges of all the power transmission lines to obtain the reactive power exchanges between the distribution network coordination control area and an external distribution network coordination control area;
inquiring each electrical device in the distribution network coordination control area about reactive load;
summing the reactive loads of all the electrical equipment to obtain the total reactive load of all the electrical equipment in the distribution network coordination control area;
inquiring each transmission line in the distribution network coordination control area for reactive loss;
summing the reactive losses of all the power transmission lines to obtain the reactive loss of a bus line in the distribution network coordination control area;
inquiring each main transformer in the distribution network coordination control area about reactive loss;
and summing the reactive losses of all the main transformers to obtain the reactive losses of all the main transformers in the distribution network coordination control area.
4. The method according to claim 3, wherein the combining at least two of the reactive indicators of the reactive power source, the reactive power exchange, the reactive load and the reactive loss to obtain the reactive indicators under capacitive reactive and inductive reactive conditions comprises:
summing the total charging reactive power of all the lines, the total configuration reactive power of the capacitor and the total delayed phase reactive power of the new energy power station to obtain regional capacitive reactive power resources of the distribution network coordination control area;
summing the reactive loss of the bus line, the reactive losses of all the main transformers, the negative values of the first variable and the second variable and the third variable to obtain the regional capacitive reactive demand of the distribution network coordination control area;
if the total reactive load of all the electrical equipment is greater than 0, the first variable is the total reactive load of all the electrical equipment, and if the total reactive load of all the electrical equipment is less than or equal to 0, the first variable is 0;
if the reactive power exchange with the superior power grid is less than 0, the second variable is the reactive power exchange with the superior power grid, and if the reactive power exchange with the superior power grid is greater than or equal to 0, the second variable is 0;
if the reactive power exchange with the external distribution network coordination control area is larger than 0, the third variable is the reactive power exchange with the external distribution network coordination control area, and if the reactive power exchange with the external distribution network coordination control area is smaller than or equal to 0, the third variable is 0;
calculating the ratio of the regional capacitive reactive resources to the regional capacitive reactive demand to obtain the regional capacitive reactive balance rate of the distribution network coordination control area;
summing the negative value of the total configuration reactive power of the reactor, the negative values of the total phase-entering reactive power of all the new energy power stations, the reactive power loss of the main line and the reactive power loss of all the main transformers to obtain regional inductive reactive power resources of the distribution network coordination control area;
summing the total charging reactive power, the negative values of the fourth variable and the fifth variable and the sixth variable of all the lines to obtain the regional inductive reactive power demand of the distribution network coordination control area;
if the total reactive load of all the electrical equipment is less than 0, the fourth variable is a negative value of the total reactive load of all the electrical equipment, and if the total reactive load of all the electrical equipment is greater than or equal to 0, the fourth variable is 0;
if the reactive power exchange with the upper-level power grid is greater than 0, the fifth variable is a negative value of the reactive power exchange with the upper-level power grid, and if the reactive power exchange with the upper-level power grid is less than or equal to 0, the fifth variable is 0;
if the reactive power exchange with the external distribution network coordination control area is less than 0, the sixth variable is a negative value of the reactive power exchange with the external distribution network coordination control area, and if the reactive power exchange with the external distribution network coordination control area is greater than or equal to 0, the sixth variable is 0;
and calculating the ratio of the inductive reactive resources of the region to the inductive reactive requirements of the region to obtain the inductive reactive balance rate of the region of the distribution network coordination control region.
5. The method of claim 1, wherein the step of counting the voltage indicators of the electrical devices in the distribution network coordination control area comprises:
counting a first number of the electrical devices in the distribution network coordinated control area, each of the electrical devices having a voltage value;
counting a second number of the electrical devices of which the voltage value is greater than or equal to an upper limit value;
counting a third number of the electrical devices of which the voltage value is smaller than an upper limit value and is smaller than or equal to a difference value obtained by subtracting a first threshold value from the upper limit value;
counting a fourth number of the electrical devices of which the voltage value is less than or equal to a lower limit value;
counting a fifth number of the electrical devices of which the voltage value is greater than a lower limit value and less than or equal to a sum of the lower limit value and a second threshold value;
calculating a ratio between the second number and the first number as a first probability that the electrical device is over the upper limit;
calculating a ratio between the third number and the first number as a second probability that the electrical device approaches an upper limit;
calculating a ratio between the fourth number and the first number as a third probability that the lower limit of the electrical device is exceeded;
calculating a ratio between the fifth number and the first number as a fourth probability that the electrical device approaches a lower limit.
6. The method according to any one of claims 1-5, wherein the adjusting the operation state of the distribution network coordination control area according to the reactive index and the voltage index comprises:
constructing nodes using one or more conditions, each node pointing to a next node or adjusting a manner of operation state of the distribution network coordination control area;
traversing the reactive index and the voltage index sequentially through the conditions in the nodes to determine a mode of adjusting the running state of the distribution network coordination control area;
and adjusting the running state of the distribution network coordination control area according to the mode.
7. The method of claim 6, wherein traversing the reactive indicators and the voltage indicators sequentially through the conditions in the nodes to determine a manner of adjusting the operational state of the distribution network coordination control area comprises:
s1, detecting the voltage indicator of the electrical device, including:
s1.1, judging whether a first probability that the electrical equipment exceeds an upper limit is larger than an upper limit threshold value or not, or whether a second probability that the electrical equipment approaches the upper limit is larger than an upper limit threshold value or not; if yes, go to S3;
s1.2, judging whether the third probability of the lower limit of the electrical equipment is larger than the threshold value of the lower limit, or whether the fourth probability of the electrical equipment approaching the lower limit is larger than the threshold value of the lower limit; if yes, go to S5;
s2, detecting reactive power exchange between the electrical equipment and a superior power grid, including:
s2.1, judging whether reactive power exchange with a superior power grid is smaller than a first reactive power threshold value, wherein the first reactive power threshold value is smaller than 0; if yes, go to S3;
s2.2, judging whether reactive power exchange with a superior power grid is larger than a second reactive power threshold value, wherein the second reactive power threshold value is larger than 0; if yes, go to S5;
s3, performing a first detection of the capacitive reactive input of the electrical device, including:
s3.1, judging whether the input rate of the capacitor is greater than 0 or not, or whether the input rate of the new energy power station is greater than 0 and the total reactive output of all the new energy power stations is greater than 0 are met, and if yes, cutting off the capacitor or reducing the delayed phase reactive output of the new energy power stations;
s3.2, judging whether the input rate of the capacitor is equal to 0 or not, judging whether the total reactive power output of all the new energy power stations is less than or equal to 0 or not, and if yes, executing S4;
s4, the first detecting the inductive reactive input of the electrical device includes:
s4.1, judging whether the input rate of the reactor is smaller than a sensitive reactive power reserve coefficient or not, or judging whether the input rate of the new energy power station is smaller than a phase-entering reactive power rotation standby coefficient or not, and if so, inputting the reactor or increasing the phase-entering reactive power output of the new energy power station;
s4.2, judging whether the input rate of the reactor is equal to 1 or not, judging whether the input rate of the new energy power station is equal to 1 or not, and judging whether the total reactive power output of all the new energy power stations is less than 0 or not; if yes, go to S7;
s5, performing a second detection of the inductive reactive input of the electrical device, including:
s5.1, judging whether the input rate of the reactor is greater than 0 or not, or whether the input rate of the new energy power station is greater than 0 and the total reactive power output of all the new energy power stations is less than 0; if so, cutting off the reactor or reducing the phase-entering reactive power output of the new energy power station;
s5.2, judging whether the input rate of the reactor is equal to 0 or not, or judging whether the total reactive power output of all the new energy power stations is greater than or equal to 0 or not; if yes, go to S6;
s6, carrying out second detection on the capacitive reactive input of the electrical equipment, wherein the second detection comprises the following steps:
s6.1, judging whether the input rate of the capacitor is smaller than a capacitive reactive power reserve coefficient or not, or judging whether the input rate of the new energy power station is smaller than a slow-phase reactive power rotation standby coefficient or not; if yes, inputting the capacitor or increasing the delayed phase reactive output of the new energy power station;
s6.2, judging whether the input rate of the capacitor is equal to 1 or not, judging whether the input rate of the new energy power station is equal to 1 or not, and judging whether the total reactive power output of all the new energy power stations is greater than 0 or not; if yes, go to S8;
s7, judging whether the inductive reactive power balance rate of the area of the distribution network coordination control area is smaller than an inductive reactive power resource margin coefficient; if so, determining that the inductive reactive resources in the region are insufficient and no available mode is available for adjusting the running state of the distribution network coordination control region; if not, determining that no available mode for adjusting the running state of the distribution network coordination control area exists;
s8, judging whether the regional capacitive reactive power balance rate of the distribution network coordination control area is smaller than a capacitive reactive power resource margin coefficient; if so, determining that the regional capacitive reactive resources are insufficient and no available mode is available for adjusting the running state of the distribution network coordination control region; and if not, determining that no available mode for adjusting the running state of the distribution network coordination control area exists.
8. An automatic voltage control apparatus, comprising:
the control area building module is used for inquiring electrical equipment in a preset area in the power distribution network so as to build a distribution network coordination control area;
the reactive index counting module is used for counting reactive indexes of the electrical equipment in the distribution network coordination control area under multiple levels;
the voltage index counting module is used for counting voltage indexes of the electrical equipment in the distribution network coordination control area;
and the running state adjusting module is used for adjusting the running state of the distribution network coordination control area according to the reactive index and the voltage index.
9. A computer device, characterized in that the computer device comprises:
one or more processors;
a memory for storing one or more programs,
when executed by the one or more processors, cause the one or more processors to implement the automatic voltage control method of any one of claims 1-7.
10. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the automatic voltage control method according to any one of claims 1 to 7.
CN202111367454.9A 2021-11-18 2021-11-18 Automatic voltage control method, device, computer equipment and storage medium Pending CN114094591A (en)

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