CN108183494B - Method for adjusting three-phase voltage unbalance of power distribution network - Google Patents
Method for adjusting three-phase voltage unbalance of power distribution network Download PDFInfo
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- CN108183494B CN108183494B CN201810041336.0A CN201810041336A CN108183494B CN 108183494 B CN108183494 B CN 108183494B CN 201810041336 A CN201810041336 A CN 201810041336A CN 108183494 B CN108183494 B CN 108183494B
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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
- H02J3/26—Arrangements for eliminating or reducing asymmetry in polyphase networks
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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
- H02J3/14—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by switching loads on to, or off from, network, e.g. progressively balanced loading
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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
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
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- 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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
- Y02B70/3225—Demand response systems, e.g. load shedding, peak shaving
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- 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
- Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
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- 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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
- Y04S20/222—Demand response systems, e.g. load shedding, peak shaving
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Abstract
The invention relates to a method for adjusting the unbalance of three-phase voltage of a power distribution network, which comprises the steps of collecting the operation information of the power distribution network in real time and calculating the unbalance degree of the three-phase voltage of the power distribution network; when the power load is put into the power distribution network, if a heavy load phase occurs and the three-phase voltage unbalance degree of the power distribution network exceeds an allowable value, adjusting the three-phase voltage unbalance according to a first control strategy; and when the power load exits from the power distribution network, if a light load phase occurs and the three-phase voltage unbalance degree of the power distribution network exceeds an allowable value, adjusting the three-phase voltage unbalance according to a second control strategy. The problem of unbalanced three-phase voltage caused by unbalanced three-phase load in the prior art is solved.
Description
Technical Field
The invention relates to a method for adjusting three-phase voltage unbalance of a power distribution network, and belongs to the technical field of power distribution networks.
Background
With the rapid development of social economy and related technologies in China, electrical loads increasingly exhibit characteristics of diversity, randomness, flexibility and the like. Due to the randomness of the access phase of the electric load, the inconsistency of time and the like, the phenomenon of three-phase load unbalance is often caused, the three-phase load unbalance is a main factor causing the three-phase voltage unbalance, and the three-phase voltage unbalance brings numerous negative effects to the normal use of the electric load.
At present, a three-phase four-wire system power supply mode is mostly adopted in a power distribution system in China, and low-voltage users of a power distribution network are mostly single-phase loads, so that three-phase load imbalance is common in the low-voltage power distribution system. When three-phase load unbalance occurs in a power distribution network, zero-sequence current can be generated in a neutral line of the power distribution system due to asymmetry of three-phase load current, so that neutral point voltage drift of a transformer is caused, heavy-load phase voltage is reduced, light-load phase voltage is increased, and finally three-phase voltage unbalance is caused. The unbalanced three-phase voltage can affect the safe and reliable operation of a power distribution system, increase the electric energy loss of a power grid and reduce the quality of power supply electric energy, so that the unbalanced three-phase voltage becomes one of main indexes for power grid electric energy quality assessment, and the problem that how to adjust the total power of different phase sequence electric loads of the power distribution network and adjust the unbalanced three-phase voltage of the power distribution network is urgently needed to be solved in the prior art is solved.
Disclosure of Invention
The invention provides a method for adjusting three-phase voltage unbalance of a power distribution network, and aims to solve the problem of three-phase voltage unbalance caused by unbalanced load of the power distribution network in the prior art.
In order to achieve the above object, the present invention provides a method for adjusting an imbalance of three-phase voltage of a power distribution network, that is, a first scheme, comprising the following steps:
(1) collecting the running information of the power distribution network in real time, and calculating the unbalance degree of the three-phase voltage of the power distribution network;
(2) when the power load is put into the power distribution network, if a heavy load phase occurs and the three-phase voltage unbalance degree of the power distribution network exceeds an allowable value, adjusting the three-phase voltage unbalance according to a first control strategy;
(3) when the power load exits from the power distribution network, if a light load phase occurs and the three-phase voltage unbalance degree of the power distribution network exceeds an allowable value, adjusting the three-phase voltage unbalance according to a second control strategy;
the heavy load phase refers to an unbalanced phase with the maximum total power of loads connected with the power distribution network; the light load phase refers to an unbalanced phase with the minimum total power of loads connected with the power distribution network;
the first control strategy comprises the steps of:
a1: if the heavy load phase is connected with the flexible load, the flexible load in the heavy load phase is withdrawn;
a2: detecting the unbalance degree of the three-phase voltage in real time, and if the three-phase voltage is not balanced, putting an energy storage device into a heavy-load phase, wherein the energy storage device is used as a power supply for discharging;
a3: if the three-phase voltage unbalance is detected to be still beyond the allowable value, putting the flexible load into a phase sequence outside the heavy load phase, and adjusting the three-phase voltage unbalance;
the second control strategy comprises the steps of:
b1: if the phase sequence outside the light load phase has an energy storage device or a flexible load as a load, the energy storage devices are withdrawn in sequence;
b2: detecting the unbalance degree of the three-phase voltage in real time, and if the three-phase voltage is not balanced, withdrawing the flexible load connected to the phase sequence except the light load phase;
b3: if the three-phase voltage unbalance still exceeds the allowable value, an energy storage device is put into the light load phase and is used as a load for charging;
b4: if the three-phase voltage is not balanced after the energy storage device is put into the light load phase, the flexible load is further put into the light load phase, and therefore the three-phase voltage unbalance is adjusted.
Scheme II: on the basis of the first scheme, when the flexible load is input to the phase sequence outside the heavy load phase, the flexible load can input single phase or two phases outside the heavy load phase.
The third scheme is as follows: on the basis of the first scheme, the three-phase voltage unbalance is calculated by the following formula:
wherein epsilonU(2)Is the negative sequence imbalance of the voltage; epsilonU(0)Zero sequence imbalance for voltage; u shape(1)、U(2)And U(0)Are respectively three-phasePositive, negative and zero sequence components of the voltage root mean square values.
Scheme four, five and six: on the basis of the scheme I, the scheme II or the scheme III, when the three-phase unbalance degree is detected to be smaller than the allowable value, the input or the exit of the energy storage device or the flexible load in the power distribution network is stopped.
Scheme seven, eight, nine: on the basis of the scheme four, five or six, when single-phase adjustment in the power distribution network is carried out, any one phase can be connected to a single or a plurality of energy storage devices or flexible loads.
According to the method, the operation information of the power grid is collected, the unbalance degree of the three-phase voltage of the power grid is calculated, a first control strategy is adopted when the power load is input into the power distribution network and the three-phase voltage is unbalanced due to a heavy load phase, and a second control strategy is adopted when the power load is withdrawn from the power distribution network and the three-phase voltage is unbalanced due to a light load phase. The power of the energy storage device and the power of the flexible load connected to the power distribution network are sequentially adjusted through two control strategies, so that the advantages of bidirectional power control of the energy storage device and flexible and adjustable flexible load are fully utilized, and convenience in three-phase voltage unbalance adjustment of the power distribution network is improved; on the other hand, under the condition that the power requirements of conventional loads, particularly important loads, are not changed, the total power of equivalent loads connected to each phase sequence is changed, the unbalance of the three-phase voltage of the power distribution network can be adjusted, and the stable operation of the power distribution network is guaranteed.
Drawings
FIG. 1 is a schematic diagram of a power distribution network system architecture according to the present invention;
FIG. 2 is a schematic diagram of the overall adjustment process of the three-phase voltage imbalance of the power distribution network according to the invention;
FIG. 3 is a schematic diagram of a three-phase voltage imbalance adjustment process when the load is placed in a power distribution network according to the present invention;
fig. 4 is a schematic diagram of a three-phase voltage imbalance adjustment process when the load exits the distribution network.
Detailed Description
According to the method for adjusting the three-phase voltage unbalance of the power distribution network, the power of the energy storage device and the power of the flexible load which are connected into the power distribution network system are sequentially adjusted under the condition that the power of the conventional load, particularly the power of the important load connected into the power distribution network is not changed, the three-phase voltage unbalance of the power distribution network meets the allowable range, and the stable operation of the power distribution network system is guaranteed.
The heavy load phase in the technical scheme of the invention refers to the unbalanced phase with the maximum total power of the load connected with the power distribution network, and the phase can cause the voltage to be obviously reduced due to the larger total power of the load;
the light load phase sequence refers to an unbalanced phase with the minimum total load power of the distribution network, and the phase can cause the voltage to be remarkably increased due to the smaller total load power.
The technical scheme of the invention is further explained by combining the accompanying drawings as follows:
as shown in fig. 2, the present invention provides a method for adjusting three-phase voltage imbalance of a power distribution network, comprising the following steps:
(1) the power distribution network master station monitoring system receives running information such as power of each load accessed to the power distribution network in real time, and analyzes and calculates the three-phase voltage unbalance of the whole system;
(2) when the power load is put into the power distribution network, if the three-phase voltage unbalance degree meets the requirement (namely does not exceed an allowable value), the power distribution network stably operates; if a heavy load phase occurs, and the three-phase voltage unbalance of the power distribution network exceeds an allowable value, adjusting the three-phase voltage unbalance according to the following steps:
a1: if the heavy load phase is connected with the flexible load, the flexible load on the heavy load phase is withdrawn to adjust the unbalance of the three-phase voltage;
a2: if the three-phase voltage unbalance degree does not meet the requirement after the heavy load phase exits the flexible load, the energy storage device is put into the heavy load phase and discharged to reduce the total power of the heavy load phase and adjust the three-phase voltage unbalance;
a3: if the three-phase voltage unbalance degree can not meet the allowable value when the energy storage device is put into the heavy load phase, the flexible load is further put into a phase sequence outside the heavy load phase, and the three-phase voltage unbalance is adjusted by changing the total power of the phase sequence outside the heavy load phase.
(3) When the power load exits from the power distribution network, if the three-phase voltage unbalance degree meets the requirement (namely does not exceed the allowable value), the power distribution network stably operates; if the light load phase occurs, and the unbalance degree of the three-phase voltage of the power distribution network exceeds an allowable value, adjusting the unbalance of the three-phase voltage according to the following steps:
b1: if the phase sequence outside the light load phase has an energy storage device or a flexible load as a load, sequentially quitting the energy storage device load;
b2: if the phase sequence except the light load phase exits from the energy storage device load and cannot meet the requirement of three-phase voltage unbalance degree, the connected flexible loads are sequentially exited;
b3: if the phase sequence except the light load phase exits the flexible load and cannot meet the requirement of three-phase voltage unbalance degree, the energy storage device is put into the light load phase and is charged so as to increase the total power of the light load phase and adjust the three-phase voltage unbalance;
b4: if the input energy storage device still can not enable the three-phase voltage unbalance degree to meet the requirements, a flexible load is further input to the light load phase, and the three-phase voltage unbalance is adjusted by changing the total power of the light load phase.
Based on the technical scheme, a specific embodiment applying the scheme is provided:
as shown in fig. 1, the power distribution network system architecture adopts a three-phase four-wire system power supply mode, and mainly comprises a power distribution network three-phase power supply (phase a, phase B, and phase C), a PEN line, and a conventional load L1…LnEnergy storage device SE comprising converter1…SEmFlexible load FL1…FLpAnd the related circuit breaker and the like.
Power distribution network master station monitoring system receives each conventional power load L in real timei(i is 1,2,3, …, n) accessing operation information such as power of the power distribution network, analyzing and calculating the three-phase voltage unbalance epsilon of the whole system, and if the three-phase voltage unbalance meets the requirement, the power distribution network stably operates; if the three-phase voltage unbalance epsilon of the power distribution network cannot meet the requirement due to the input or the exit of the conventional load, the energy storage device SE is changedj(j ═ 1,2,3, …, m) or flexibilityLoad FLk(k is 1,2,3, …, p) accessing the power of the power distribution network to adjust the three-phase voltage unbalance of the power distribution network, so that the three-phase voltage unbalance epsilon meets the requirement; the three-phase voltage unbalance epsilon of the power distribution network can be obtained by calculation through a formula (1) and a formula (2)
Wherein epsilonU(2)Is the negative sequence imbalance of the voltage; epsilonU(0)Zero sequence imbalance for voltage; u shape(1)、U(2)And U(0)The positive sequence, negative sequence and zero sequence components of the three-phase voltage are root mean square values respectively.
When the electrical load L is normaliWhen the power distribution network is put into use, if a heavy load phase occurs, the three-phase voltage unbalance epsilon of the power distribution network exceeds an allowable value epsilonAllow forI.e. epsilon > epsilonAllow forThen the three-phase voltage imbalance is adjusted according to the following steps, as shown in fig. 3:
(1) if the heavy load phase is connected with the flexible load FL, the flexible load FL on the heavy load phase is removed, and the power of the flexible load FL is changed
Adjusting the unbalance of the three-phase voltage;
(2) if the three-phase voltage unbalance epsilon does not meet the requirement after the heavy load phase exits the flexible load FL, namely epsilon is larger than epsilonAllow forPut the energy storage device SE into the heavy load phase and regulate the output power
By reducing the total power of the heavy-duty phases to
And adjusting the unbalance of the three-phase voltage.
(3) If the energy storage device SE is put into the heavy load phaseThe three-phase voltage unbalance epsilon can not meet the allowable value epsilonAllow forI.e. epsilon > epsilonAllow forAnd further inputting the flexible load FL to a phase sequence outside the heavy load phase, and adjusting the three-phase voltage unbalance by changing the total power of each phase sequence outside the heavy load phase.
Current electric load LiWhen the distribution network is withdrawn, if a light load phase appears, the three-phase voltage unbalance epsilon of the distribution network exceeds an allowable value epsilonAllow forI.e. epsilon > epsilonAllow forThen the three-phase voltage imbalance is adjusted according to the following steps, as shown in fig. 4:
(1) if the energy storage device SE or the flexible load FL used as the load exists in the phase sequence except the light load phase, the energy storage device load is withdrawn in sequence, and the power of the energy storage device load is changed
Adjusting the unbalance of the three-phase voltage;
(2) if the phase sequence except the light load phase exits from the energy storage device load, the three-phase voltage unbalance epsilon does not meet the requirement, namely epsilon is larger than epsilonAllow forThen the connected flexible loads FL are sequentially exited, by varying their power
Adjusting the unbalance of the three-phase voltage;
(3) if the three-phase voltage unbalance epsilon does not meet the requirement after the phase sequence except the light load phase exits the flexible load FL, namely epsilon is larger than epsilonAllow forThen put the energy storage device SE into the light load phase and regulate its input power
The unbalance of three-phase voltage is adjusted by increasing the total power of the light load phase; if the energy storage device SE is put into use, the three-phase voltage unbalance degree can not meet the requirement, namely epsilon is more than epsilonAllow forThen further inputting the FL power of the flexible load
To the light load phase, the total power of the light load phase is changed to the three-phase voltageThe imbalance is adjusted.
As a further improvement to the above embodiment, the calculation of the three-phase voltage unbalance may also be obtained by calculating a ratio of a positive sequence capacity to a positive sequence capacity of a three-phase load, the three-phase voltage unbalance caused by the load at the point of common connection being equal to a ratio of a negative sequence capacity to a system short circuit capacity of the load.
As a further improvement to the above embodiment, the power of the energy storage device connected to the distribution network is regulated by means of a converter. When the single phase in the power distribution network is adjusted, any phase of the power distribution network can be connected to one or more energy storage devices and flexible loads; during one adjustment, single or multiple energy storage devices or flexible loads can be accessed/accessed.
The specific embodiments are given above, but the present invention is not limited to the described embodiments. The basic idea of the present invention lies in the above basic scheme, and it is obvious to those skilled in the art that no creative effort is needed to design various modified models, formulas and parameters according to the teaching of the present invention. Variations, modifications, substitutions and alterations may be made to the embodiments without departing from the principles and spirit of the invention, and still fall within the scope of the invention.
Claims (5)
1. A method for adjusting three-phase voltage unbalance of a power distribution network is characterized by comprising the following steps:
(1) collecting the running information of the power distribution network in real time, and calculating the unbalance degree of the three-phase voltage of the power distribution network;
(2) when the power load is put into the power distribution network, if a heavy load phase occurs and the three-phase voltage unbalance degree of the power distribution network exceeds an allowable value, adjusting the three-phase voltage unbalance according to a first control strategy;
(3) when the power load exits from the power distribution network, if a light load phase occurs and the three-phase voltage unbalance degree of the power distribution network exceeds an allowable value, adjusting the three-phase voltage unbalance according to a second control strategy;
the heavy load phase refers to an unbalanced phase with the maximum total power of loads connected with the power distribution network; the light load phase refers to an unbalanced phase with the minimum total power of loads connected with the power distribution network;
the first control strategy comprises the steps of:
a1: if the heavy load phase is connected with the flexible load, the flexible load in the heavy load phase is withdrawn;
a2: detecting the unbalance degree of the three-phase voltage in real time, and if the three-phase voltage is not balanced, putting an energy storage device into a heavy-load phase, wherein the energy storage device is used as a power supply for discharging;
a3: if the three-phase voltage unbalance is detected to be still beyond the allowable value, putting the flexible load into a phase sequence outside the heavy load phase, and adjusting the three-phase voltage unbalance;
the second control strategy comprises the steps of:
b1: if the phase sequence outside the light load phase has an energy storage device or a flexible load as a load, the energy storage device is withdrawn;
b2: detecting the unbalance degree of the three-phase voltage in real time, and if the three-phase voltage is not balanced, withdrawing the flexible load connected to the phase sequence except the light load phase;
b3: if the three-phase voltage unbalance still exceeds the allowable value, an energy storage device is put into the light load phase and is used as a load for charging;
b4: if the three-phase voltage is not balanced after the energy storage device is put into the light load phase, the flexible load is further put into the light load phase, and therefore the three-phase voltage unbalance is adjusted.
2. The method for regulating the three-phase voltage imbalance of the power distribution network as recited in claim 1, wherein the flexible load is capable of being input into one phase or two phases other than the heavy-load phase when the flexible load is input into the phase sequence other than the heavy-load phase.
3. The method for adjusting the three-phase voltage unbalance of the power distribution network according to claim 1, wherein the three-phase voltage unbalance is calculated by the following formula:
wherein epsilonU(2)Is the negative sequence imbalance of the voltage; epsilonU(0)Zero sequence imbalance for voltage; u shape(1)、U(2)And U(0)The positive sequence, negative sequence and zero sequence components of the three-phase voltage are root mean square values respectively.
4. The method for adjusting the three-phase voltage unbalance of the power distribution network according to any one of claims 1 to 3, wherein when the three-phase unbalance degree is detected to be less than an allowable value, the input or the output of the energy storage device or the flexible load in the power distribution network is stopped.
5. A method of regulating imbalance in three phase voltages in an electric distribution network, according to claim 4, where any phase can be connected to a single or multiple energy storage devices or flexible loads when adjusting for a single phase in the distribution network.
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| CN103580258A (en) * | 2012-07-20 | 2014-02-12 | 施耐德电器工业公司 | Electric power distribution method and device |
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