CN112821411B - Automatic voltage control method considering reduction of reactive power flow of electromagnetic ring network - Google Patents
Automatic voltage control method considering reduction of reactive power flow of electromagnetic ring network Download PDFInfo
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Abstract
The invention belongs to the technical field of automatic voltage control of power systems, and particularly relates to an automatic voltage control method considering reducing reactive power flow of an electromagnetic ring network. The method comprises the steps of firstly, carrying out on-line identification and judgment on the operation mode of a regional power grid, and automatically finding out the existing 220kV-110kV electromagnetic looped network path; and then, in an automatic voltage control system, by monitoring the reactive power of a reactive power sending end and a reactive power receiving end in the electromagnetic looped network, when the reactive power measurement of the reactive power sending end exceeds a given reactive power constraint upper limit on a looped network path, the upper voltage limit of a bus connected with the reactive power sending end is modified, so that a capacitor or a transformer on-load voltage regulating tap in a transformer substation is controlled after the bus is out of limit, the reactive power provided by the reactive power sending end to the electromagnetic looped network path is reduced, the influence of reactive power crossing on a power grid is eliminated, and the running economy of the power grid is improved.
Description
Technical Field
The invention belongs to the technical field of automatic voltage control of power systems, and particularly relates to an automatic voltage control method considering reducing reactive power flow of an electromagnetic ring network.
Background
An automatic voltage control (hereinafter referred to as AVC, automatic Voltage Control) system is an important means for realizing safe (voltage stability margin improvement), economical (network loss reduction) and high-quality (voltage qualification rate improvement) operation of a power grid, and the basic principle is that the reasonable distribution of reactive voltage in the power grid is realized by coordinately controlling reactive output of a generator, a transformer tap and reactive compensation equipment.
So far, there are three main modes of automatic voltage control in the mainstream world:
the first is that the German RWE electric company represents the second-level control, the partition control is not adopted, and the Optimal Power Flow (OPF) calculation result is directly sent to the first-level voltage controller of each power plant for control. However, the OPF model is computationally intensive and takes a long time to calculate. When large disturbance, load steep rise or steep drop occurs in the system, if the OPF is completely relied on, the response speed of AVC is insufficient, and the dynamic quality of control is difficult to ensure.
The second is that the research and implementation of the three-stage voltage control mode in French EDF starts in the 70 s of the last century, and has undergone more than thirty years of research, development and application, and is currently internationally recognized as the most advanced voltage control system. This control mode is well applied but still has drawbacks because the Secondary Voltage Control (SVC) of the zones is developed based on the locality of the reactive voltage of the power system, whereas the reactive voltage between the zones is coupled, and the quality of the control system is therefore fundamentally dependent on the degree of coupling of the reactive voltage control between the zones. However, with the development of the power system and the real-time change of the operation condition, the area which is relatively decoupled is not considered to be invariable in design, and the control sensitivity existing in the form of fixed control parameters is changed in real time with the operation condition, so that the area controller fixed in the form of hardware is difficult to adapt to the continuous development of the power system and the large-scale change of the real-time operation condition, and therefore, the good control effect is difficult to be permanently ensured.
The third is that the motor system dispatching automation laboratory of Qinghua university puts forward a three-level voltage control mode based on soft partition, and the mode overcomes the defect of hard partition in EDF three-level voltage control through soft partition, has been widely applied to power grids in twenty or more areas and provincial power grids in China, and is successfully popularized to voltage control of North American PJM power grid. In this mode, the AVC application software of the dispatch center is composed of a tertiary control module and a secondary control module. Three-level control is an Optimal Power Flow (OPF) of global reactive power optimization, and a voltage optimization control target of whole network coordination is given; the secondary control is the control strategy calculation of partition decoupling, the optimization control targets of the central buses in each partition given by the tertiary control are taken as input, reactive power regulation equipment such as power plants in the partition are considered, the control strategies of various reactive power resources in the partition are calculated, and the reactive power regulation equipment is issued to the power plants and substations; the substation device at the station end completes the primary control, receives the control strategy issued by the dispatching master station and executes the control strategy. The automatic voltage control software developed by the mode is widely applied in China at present, is installed and deployed in provincial and regional power grid dispatching control centers, and automatically controls the voltage and reactive power of each voltage class in the power grid.
At present, in the operation of a power system in China, regional power grids of 220kV and below are operated in a radiation mode. In a regional power grid, 220kV lines are connected between 220kV substations in the regional power grid, and 110kV substations connected through transformers are only connected with upper-level 220kV substations, so that no lines are connected between the 110kV substations. For a 35kV power grid, the 35kV transformer substation is only connected with an upper-level 110kV transformer substation, and no line is connected between the 35kV transformer substations. Under the operation mode, the radiation operation area of the transformer substation with each voltage class of 220kV-110kV-35kV can be formed from the high-voltage side bus of the 220kV transformer substation. A method for generating the above-mentioned region is proposed in the technical invention patent of epitaxy, shang Lei, wang Shuang, i.e. automatic generation method of coordination control region in county integrated automatic voltage control. And uses the generated region model
The definition of the expression is shown as a formula (1):
wherein:
The bus bars of the column operation are combined into one bar, and the same applies below), and H is total, and h=1.2.3 … H;
At present, the power grid in most areas has 220kV and below voltage and the likeThe stages being operated by radiation, i.e. zone
110kV busbar>
And other areas->
110kV busbar>
There is no 110kV line connection between the two, and in the operation mode, the reactive voltage control in the area only affects the voltage reactive power of 110kV and 35kV power grids in the area, and has no influence on other areas. Meanwhile, the situation that 220kV and 110kV electromagnetic loop closing operation still exists in partial regional power grids exists, namely 110kV line connection exists among 110kVV buses of 2 220kV substations, so that an electromagnetic loop network consisting of the 220kV buses, 220kV main transformers, 110kV buses and 110kV lines is formed, and a typical structure of the electromagnetic loop network is shown in the attached drawing (1). As can be seen from FIG. 1, when a 220kV-110kV electromagnetic ring network is present, the region is formed +.>
Is->
All belong to a plurality of 220kV substations.
When an operation mode of 220kV-110kV electromagnetic looped network exists in a regional power grid, voltage reactive power control of one region can influence other regions through 110kV lines among the regions, reactive power equipment adjustment in the same region can also influence reactive power of 110kV interconnecting lines among the regions, on one hand, reactive power flow of the 110kV interconnecting lines can be increased, reactive power crossing among the regions is increased, and the economical efficiency of power grid operation is influenced; on the other hand, in severe cases, regional tie line current out of limit and line fault shutdown can be caused, and safety and stability of power grid operation are affected. Therefore, when the automatic voltage control is performed on the regional power grid with the 220kV-110kV electromagnetic looped network, the safety operation constraint condition of 110kV interconnecting lines among the areas is considered on the basis of the existing AVC control strategy, and reactive power crossing among the areas is reduced.
Disclosure of Invention
The invention aims to provide an automatic voltage control method considering reducing reactive power flow of an electromagnetic ring network, which is improved to reduce reactive power provided by a reactive power sending end to an electromagnetic ring network path and eliminate the influence of reactive power crossing on a power grid, thereby reducing reactive power flow in the electromagnetic ring network and improving the running economy of the power grid.
The invention provides an automatic voltage control method considering reducing reactive power flow of an electromagnetic ring network, which comprises the following steps of:
(1) When the data acquisition period arrives, a coordination control area of a 220kV-110kV transformer substation of a regional power grid is formed and is recorded as
i=1, …, N being the number of coordinated control areas in the regional power grid;
(2) Sequentially checking all coordination control areas of the step (1)
Bus bar in coordination control area +.>
If the bus in the bus is only a 1-seat 220kV transformer substation, the next coordinated control area is continuously checked, and if the bus in the coordinated control area is in the coordinated control area
The bus in the transformer station belongs to two or more 220kV transformer substations at the same time, and then judgment is carried outThe coordination control area comprises a 220kV-110kV electromagnetic ring network, and the following steps are executed for the coordination control area:
(2-1) establishing a path set P, wherein the path set P is an empty set during initialization;
(2-2) from
Any bus B is taken out i Searching along all 110kV lines connected with the bus Bi and 110kV buses and 110kV lines connected with all 110kV lines, if +.>
110kV bus B belonging to other 220kV stations j Then an electromagnetic ring network path P is obtained ij The method is characterized by comprising the following steps:
P ij (B i ，B j ，L k ，k＝1，...，K)
wherein L is k For 110kV line set experienced in the searching process, P is calculated ij Add path set P while bus B i And B j From the slave
Removing the components; if->
110kV buses belonging to other 220kV stations are not existed in the system, B is carried out i From->
Removing the components;
(2-3) repeating step (2-2) until
No bus record;
(3) According to the path set P in the step (2), a gateway model is established, and the real-time running state of the gateway is collected, and the method comprises the following steps:
(3-1) establishing an electromagnetic ring network gateway set G, wherein the electromagnetic ring network gateway set G is empty during initialization;
(3-2) for each path P in the path set P of step (2) ij Establishing two corresponding gateway models G i And G j The method comprises the following steps of: g i (B i ，L i ) And G j (B j ，L j ) Wherein B is i Is path P ij 110kV bus B in (2) i ，L i Is P ij One end of the 110kV line is concentrated and connected to the bus B i Line B of (2) j Is path P ij 110kV bus B in (2) j ，L j Is P ij One end of the 110kV line is concentrated and connected to the bus B j Line of gateway G to be established i And G j Adding the electromagnetic ring network gateway set G;
(3-3) for each gateway G in the gateway set G i Collecting real-time operation state V of each gateway from power grid energy management system gi And Q gi Wherein V is gi Is G i Middle bus B i Voltage value, Q gi For 110kV line L i In bus B i Reactive value of the side;
(4) According to the operation state of each gateway in each electromagnetic ring network gateway set acquired in the step (3-3), automatically generating a voltage control limit value of a gateway bus, comprising the following steps:
(4-1) opposite gateway G i Judging, if the condition is satisfied:
Q gi ＞Q g，max
110kV bus B contained in gateway is arranged i Upper voltage control limit V of (2) gi，max And a control lower limit value V gi，min The following are provided:
wherein Q is g，max For the maximum value of reactive power crossing of the set electromagnetic ring network, V max An upper limit value of the test of 110kV bus voltage, V min 110k ofV bus voltage checking lower limit value, V band The minimum bandwidth of the upper limit value and the lower limit value of the 110kV bus voltage is set, and DeltaV is a voltage control threshold value;
(4-2) opposite gateway G i If the condition is satisfied:
Q gi ＜--Q g，max
110kV bus B contained in gateway is arranged i Upper voltage limit V of (2) gi，max And a lower limit value V gi，min The following are provided:
(4-3) opposite gateway G i If the condition of the step (4-1) is not satisfied or the condition of the step (4-2) is not satisfied, setting a 110kV bus B contained in the gateway i Upper voltage limit V of (2) gi，max And a lower limit value V gi，min The following are provided:
V gi，max ＝V max ，V gi，min ＝V min ；
(5) When the automatic control period comes, according to the operation condition of each gateway in the step (3-3), the automatic voltage control system calculates and generates a control strategy to reduce reactive power flow in the electromagnetic ring network, and the method comprises the following steps:
(5-1) for the gateway meeting the condition of step (4-1), gateway bus B i The voltage measurement value of (2) exceeds the voltage control upper limit value, and AVC automatically generates a control strategy for exiting the capacitor in the substation, thereby reducing the gateway bus B i Reducing reactive power flowing into the electromagnetic ring network;
(5-2) for the gateway meeting the condition of the step (4-2), a gateway bus B i The AVC automatically generates a control strategy of putting into the capacitor in the substation so as to raise the gateway bus B i Reducing reactive power received from the electromagnetic ring network;
and (5-3) calculating a control strategy for other gateways except the step (5-1) and the step (5-2) according to the upper limit value and the lower limit value of the normal bus voltage check.
The invention provides an automatic voltage control method considering reducing reactive power flow of an electromagnetic ring network, which has the advantages that:
according to the automatic voltage control method considering reducing the reactive power flow of the electromagnetic looped network, firstly, the running mode of a regional power grid is identified and judged on line, and the existing 220kV-110kV electromagnetic looped network path is automatically found; and then, in an automatic voltage control system, by monitoring the reactive power of a reactive power sending end and a reactive power receiving end in the electromagnetic looped network, when the reactive power measurement of the reactive power sending end exceeds a given reactive power constraint upper limit on a looped network path, the upper voltage limit of a bus connected with the reactive power sending end is modified, so that a capacitor or a transformer on-load voltage regulating tap in a transformer substation is controlled after the bus is out of limit, the reactive power provided by the reactive power sending end to the electromagnetic looped network path is reduced, the influence of reactive power crossing on a power grid is eliminated, and the running economy of the power grid is improved.
Drawings
Fig. 1 is a schematic diagram of an electromagnetic ring network according to an embodiment of the present invention.
Detailed Description
The invention provides an automatic voltage control method considering reducing reactive power flow of an electromagnetic ring network, which comprises the following steps of:
(1) When the data acquisition period arrives, a coordination control area of a 220kV-110kV transformer substation of a regional power grid is formed and is recorded as
i=1, …, N being the number of coordinated control areas in the regional power grid;
(2) Sequentially checking all coordination control areas of the step (1)
Bus bar in coordination control area +.>
If the bus in the system only belongs to 1 220kV transformer substation, the next coordinated control area is continuously checked, ifIn coordination control areas
The bus in the coordination control area is judged to contain 220kV-110kV electromagnetic looped networks when the bus belongs to two or more 220kV substations, and the following steps are executed for the coordination control area:
(2-1) establishing a path set P, wherein the path set P is an empty set during initialization;
(2-2) from
Any bus B is taken out i Searching along all 110kV lines connected with the bus Bi and 110kV buses and 110kV lines connected with all 110kV lines, if +.>
110kV bus B belonging to other 220kV stations j Then an electromagnetic ring network path P is obtained ij The method is characterized by comprising the following steps:
P ij (B i ，B j ，L k ，k＝1，...，K)
wherein L is k For 110kV line set experienced in the searching process, P is calculated ij Add path set P while bus B i And B j From the slave
Removing the components; if->
110kV buses belonging to other 220kV stations are not existed in the system, B is carried out i From->
Removing the components;
(2-3) repeating step (2-2) until
No longer has bus bar record；
(3) According to the path set P in the step (2), a gateway model is established, and the real-time running state of the gateway is collected, and the method comprises the following steps:
(3-1) establishing an electromagnetic ring network gateway set G, wherein the electromagnetic ring network gateway set G is empty during initialization;
(3-2) for each path P in the path set P of step (2) ij Establishing two corresponding gateway models G i And G j The method comprises the following steps of: g i (B i ，L i ) And G j (B j ，L j ) Wherein B is i Is path P ij 110kV bus B in (2) i ，L i Is P ij One end of the 110kV line is concentrated and connected to the bus B i Line B of (2) j Is path P ij 110kV bus B in (2) j ，L j Is P ij One end of the 110kV line is concentrated and connected to the bus B j Line of gateway G to be established i And G j Adding the electromagnetic ring network gateway set G;
(3-3) for each gateway G in the gateway set G i Collecting real-time operation state V of each gateway from power grid energy management system gi And Q gi Wherein V is gi Is G i Middle bus B i Voltage value, Q gi For 110kV line L i In bus B i Reactive value of the side;
(4) According to the operation state of each gateway in each electromagnetic ring network gateway set acquired in the step (3-3), automatically generating a voltage control limit value of a gateway bus, comprising the following steps:
(4-1) opposite gateway G i Judging, if the condition is satisfied:
Q gi ＞Q g，max
110kV bus B contained in gateway is arranged i Upper voltage control limit V of (2) gi，max And a control lower limit value V gi，min The following are provided:
wherein Q is g，max For the maximum value of reactive power crossing of the set electromagnetic ring network, V max An upper limit value of the test of 110kV bus voltage, V min Is the lower limit value of the 110kV bus voltage, V band The minimum bandwidth is the minimum bandwidth of the upper limit value and the lower limit value of the 110kV bus voltage, in one embodiment of the invention, the minimum bandwidth is 4kV, deltaV is a smaller voltage control threshold value, and in one embodiment of the invention, the voltage control threshold value is 0.1kV;
it is meant to pass through gateway G i The reactive power flowing out of the electromagnetic ring network is higher than the upper limit, and if the bus voltage runs within the checking limit, the control upper limit of the bus voltage is set as the current voltage measurement value minus the threshold value, so that the bus B is enabled i The current value of the voltage is beyond the control upper limit value.
(4-2) opposite gateway G i If the condition is satisfied:
Q gi ＜-Q g，max
110kV bus B contained in gateway is arranged i Upper voltage limit V of (2) gi，max And a lower limit value V gi，min The following are provided:
it is meant to pass through gateway G i The reactive power from the electromagnetic ring network is higher than the upper limit, if the bus voltage runs within the checking limit, the lower control limit of the bus voltage is set as the current voltage measurement value plus a threshold value, so that the bus B i The current value of the voltage is beyond the control lower limit value.
(4-3) opposite gateway G i If the condition of the step (4-1) is not satisfied or the condition of the step (4-2) is not satisfied, setting a 110kV bus B contained in the gateway i Upper voltage limit V of (2) gi，max And a lower limit value V gi，min The following are provided:
V gi，max ＝V max ，V gi，min ＝V min ；
it is meant to pass through gateway G i Is within a normal range, then gateway bus B i The upper limit value and the lower limit value of the control of the device are taken and checked.
(5) When the automatic control period comes, according to the operation condition of each gateway in the step (3-3), the automatic voltage control system calculates and generates a control strategy to reduce reactive power flow in the electromagnetic ring network, and the method comprises the following steps:
(5-1) for the gateway meeting the condition of step (4-1), gateway bus B i The voltage measurement value of (2) exceeds the voltage control upper limit value, and AVC automatically generates a control strategy for exiting the capacitor in the substation, thereby reducing the gateway bus B i Reducing reactive power flowing into the electromagnetic ring network;
(5-2) for the gateway meeting the condition of the step (4-2), a gateway bus B i The AVC automatically generates a control strategy of putting into the capacitor in the substation so as to raise the gateway bus B i Reducing reactive power received from the electromagnetic ring network;
and (5-3) calculating a control strategy for other gateways except the step (5-1) and the step (5-2) according to the upper limit value and the lower limit value of the normal bus voltage check.
The present invention will now be described in detail with reference to the drawings and the specific embodiments thereof, wherein the exemplary embodiments and descriptions of the present invention are provided for illustration of the invention and are not intended to be limiting.
The embodiment is an automatic voltage control for reducing reactive power flow of an electromagnetic ring network in a 220kV partition, as shown in fig. 1, wherein the partition comprises 2 220kV substations, the voltage levels of a high-voltage side, a medium-voltage side and a low-voltage side are respectively 220kV, 110kV and 35kV, 1 110kV substation, the voltage levels of the high-voltage side, the medium-voltage side and the low-voltage side are respectively 110kV, 35kV and 10kV, the high-voltage side, the medium-voltage side, the low-voltage side and the 110kV are respectively connected to the electromagnetic ring network through 2 110kV lines, and two ellipses in fig. 1 are electromagnetic ring network paths.
The method of the present embodiment includes the steps of: the control period is generally set to 5-10 minutes, the data acquisition period is set to 30 seconds in the embodiment, the control period is set to 5 minutes, and the maximum value Q of reactive power crossing of the electromagnetic ring network is preset g，max ＝ 14.00MVar。
(1) When the data acquisition period comes, a coordination control area of 220kV-110kV transformer substations of 2 regional power grids is formed and is recorded as
And->
(2) Examination region
Only 1 110kV bus is arranged in the area and is marked as B 1 。
From the slave
Take out 1 busbar B i (i.e. B) 1 ) Along B 1 The connected 110kV lines, 110kV buses connected with the lines and the 110kV lines are subjected to depth-first search, and the +.>
110kV bus B belonging to other 220kV stations 2 Recording an electromagnetic looped network path as follows: />
P 12 (B 1 ，B 2 ，L 1 ，L 2 )
Wherein L is 1 ，L 2 For 110kV line set experienced in the searching process, P is calculated 12 Add path set P while bus B 1 And B 2 From the slave
Is removed.
(3) Establishing a gateway model according to the formed path set P, and collecting real-time running states of the gateway, wherein the method comprises the following steps:
to path P 12 Establishing 2 corresponding gateway models G 1 And G 2 The method comprises the following steps of: g 1 (B 1 ，L 1 ) And G 2 (B 2 ，L 2 ) Wherein L is 1 Is P 12 One end of the 110kV line is concentrated and connected to the bus B 1 Is a line of (a); b (B) j Is path P 1j 110kV bus B in (2) j ，L 2 Is P 12 One end of the 110kV line is concentrated and connected to the bus B 2 Is a line of (a); gateway G to be established 1 And G 2 And adding the electromagnetic ring network gateway set G.
For gateway G in gateway set G 1 And G 2 Collecting real-time operation state V of gateway from power grid energy management system g1 And Q g1 V (V) g2 And Q g2 Wherein V is g1 Is G 1 Middle bus B 1 Voltage value of V g1 ＝115.31kV，V g2 Is G 2 Middle bus B 2 Voltage value of V g2 ＝115.11kV，Q g1 For 110kV line L 1 In bus B 1 Reactive value of side, Q g1 ＝ 14.13MVar，Q g2 For 110kV line L 2 In bus B 2 Reactive value of side, Q g2 ＝-14.63MVar。
(4) According to the running state of each gateway in each electromagnetic ring network gateway set, automatically generating the voltage control limit value of the gateway bus, comprising the following steps:
(4-1) opposite gateway G 1 The conditions are satisfied:
Q g1 ＞Q g，max
110kV bus B contained in gateway is arranged 1 Upper voltage control limit V of (2) g1,max And a control lower limit value V g1,min The method comprises the following steps:
wherein: v (V) max An upper limit value of the test of 110kV bus voltage, V max ＝116.7kV；V min Is the lower limit value of the 110kV bus voltage, V min ＝110.0kV；V band Minimum bandwidth of upper and lower limit values of 110kV bus voltage, V band =4.0 kV; Δv is a smaller voltage control threshold value, Δv=0.1 kV. According to the formula, according to the first condition, V is obtained g1,ax ＝V g1 -ΔV＝(115.31-0.1)kV＝115.30kV；V g1,min ＝V min ＝110.0kV。
It is meant to pass through gateway G 1 The reactive power flowing out of the electromagnetic ring network is higher than the upper limit, and if the bus voltage runs within the checking limit, the control upper limit of the bus voltage is set as the current voltage measurement value minus the threshold value, so that the bus B is enabled 1 The current value of the voltage is beyond the control upper limit value.
Opposite gate G 2 This condition is not satisfied.
(4-2) opposite gateway G 2 The condition is not satisfied:
Q gi ＜-Q g，max
(4-3) opposite gateway G 2 If (4-1) or (4-2) is not satisfied, setting 110kV bus B contained in gateway 2 Upper voltage limit V of (2) g2，max And a lower limit value V g2，min The method comprises the following steps:
V g2，max ＝V max ＝116.7kV，V g2，min ＝V min ＝110.0kV
it is meant to pass through gateway G 2 Is within a normal range, then gateway bus B 2 The upper limit value and the lower limit value of the control of the device are taken and checked.
(5) When the automatic control period comes, according to the operation condition of each gateway, the automatic voltage control system calculates to generate a corresponding control strategy to reduce reactive power flow in the electromagnetic ring network, and the method comprises the following steps:
(5-1) for a gateway G satisfying the condition (4-1) 1 Gateway bus B 1 The voltage measurement value of (2) exceeds the voltage control upper limit value, and AVC automatically generates a control strategy for exiting the capacitor in the substation, thereby reducing the gateway motherLine B 1 Reduces reactive power flowing into the electromagnetic ring network.
(5-2) there is no gateway satisfying the condition (4-2).
(5-3) gateway G for other cases 2 And calculating a control strategy according to the upper limit value and the lower limit value of the normal bus voltage check.
V g2，min ＜V g2 ＜V g2，max
No control strategy is generated.
The foregoing has described in detail the technical solutions provided by the embodiments of the present invention, and specific examples have been applied to illustrate the principles and implementations of the embodiments of the present invention, where the above description of the embodiments is only suitable for helping to understand the principles of the embodiments of the present invention; meanwhile, as for those skilled in the art, according to the embodiments of the present invention, there are variations in the specific embodiments and the application scope, and the present description should not be construed as limiting the present invention.
Claims (1)
1. An automatic voltage control method considering reducing reactive power flow of an electromagnetic ring network is characterized by comprising the following steps of:
(1) When the data acquisition period arrives, a coordination control area of a 220kV-110kV transformer substation of a regional power grid is formed and is recorded as
N is the number of coordinated control areas in the regional power grid;
(2) Sequentially checking all coordination control areas of the step (1)
Bus bar in coordination control area +.>
The bus in the transformer station only belongs to 1 220kV transformer station, and then the next coordinated control is continuously checkedAn area, if +_in the coordination control area>
The bus in the coordination control area is judged to contain 220kV-110kV electromagnetic looped networks when the bus belongs to two or more 220kV substations, and the following steps are executed for the coordination control area:
(2-1) establishing a path set P, wherein the path set P is an empty set during initialization;
(2-2) from
Any bus B is taken out i Searching along all 110kV lines connected with the bus Bi and 110kV buses and 110kV lines connected with all 110kV lines, if +.>
110kV bus B belonging to other 220kV stations j Then an electromagnetic ring network path P is obtained ij The method is characterized by comprising the following steps:
P ij (B i ，B j ，L k ，k＝1，...，K)
wherein L is k For 110kV line set experienced in the searching process, P is calculated ij Add path set P while bus B i And B j From the slave
Removing the components; if->
110kV buses belonging to other 220kV stations are not existed in the system, B is carried out i From->
Removing the components;
(2-3) repeating step (2-2) until
No bus record;
(3) According to the path set P in the step (2), a gateway model is established, and the real-time running state of the gateway is collected, and the method comprises the following steps:
(3-1) establishing an electromagnetic ring network gateway set G, wherein the electromagnetic ring network gateway set G is empty during initialization;
(3-2) for each path P in the path set P of step (2) ij Establishing two corresponding gateway models G i And G j The method comprises the following steps of: g i (B i ，L i ) And G j (B j ，L j ) Wherein B is i Is path P ij 110kV bus B in (2) i ，L i Is P ij One end of the 110kV line is concentrated and connected to the bus B i Line B of (2) j Is path P ij 110kV bus B in (2) j ，L j Is P ij One end of the 110kV line is concentrated and connected to the bus B j Line of gateway G to be established i And G j Adding the electromagnetic ring network gateway set G;
(3-3) for each gateway G in the gateway set G i Collecting real-time operation state V of each gateway from power grid energy management system gi And Q gi Wherein V is gi Is G i Middle bus B i Voltage value, Q gi For 110kV line L i In bus B i Reactive value of the side;
(4) According to the operation state of each gateway in each electromagnetic ring network gateway set acquired in the step (3-3), automatically generating a voltage control limit value of a gateway bus, comprising the following steps:
(4-1) opposite gateway G i Judging, if the condition is satisfied:
Q gi ＞Q g，max
110kV bus B contained in gateway is arranged i Upper voltage control limit V of (2) gi，max And a control lower limit value V gi，min The following are provided:
wherein Q is g，max For the maximum value of reactive power crossing of the set electromagnetic ring network, V max An upper limit value of the test of 110kV bus voltage, V min Is the lower limit value of the 110kV bus voltage, V band The minimum bandwidth of the upper limit value and the lower limit value of the 110kV bus voltage is set, and DeltaV is a voltage control threshold value;
(4-2) opposite gateway G i If the condition is satisfied:
Q gi ＜-Q g，max
110kV bus B contained in gateway is arranged i Upper voltage limit V of (2) gi，max And a lower limit value V gi，min The following are provided:
V gi，mxa ＝V max ，
(4-3) opposite gateway G i If the condition of the step (4-1) is not satisfied or the condition of the step (4-2) is not satisfied, setting a 110kV bus B contained in the gateway i Upper voltage limit V of (2) gi，max And a lower limit value V gi，min The following are provided:
V gi，max ＝V max ，V gi，min ＝V min ；
(5) When the automatic control period comes, according to the operation condition of each gateway in the step (3-3), the automatic voltage control system calculates and generates a control strategy to reduce reactive power flow in the electromagnetic ring network, and the method comprises the following steps:
(5-1) for the gateway meeting the condition of step (4-1), gateway bus B i The voltage measurement value of (2) exceeds the voltage control upper limit value, and AVC automatically generates a control strategy for exiting the capacitor in the substation, thereby reducing the gateway bus B i Reducing reactive power flowing into the electromagnetic ring network;
(5-2) for the gateway meeting the condition of the step (4-2), a gateway bus B i Voltage control over voltage measurement values of (2)Lower limit value control, AVC automatically generates control strategy of capacitor in substation, thereby raising gateway bus B i Reducing reactive power received from the electromagnetic ring network;
and (5-3) calculating a control strategy for other gateways except the step (5-1) and the step (5-2) according to the upper limit value and the lower limit value of the normal bus voltage check.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102593840A (en) * | 2012-02-23 | 2012-07-18 | 中国电力科学研究院 | Voltage-reactive power control method for regional power grid |
| CN102738800A (en) * | 2012-07-05 | 2012-10-17 | 中国电力科学研究院 | Prefecture-county integrated automatic voltage control method |
| WO2014169709A1 (en) * | 2013-04-18 | 2014-10-23 | 国家电网公司 | Reactive voltage optimization control method for centralized grid-integration of wind power and solar power |
| CN105071397A (en) * | 2015-07-27 | 2015-11-18 | 中国电力科学研究院 | Coordinated reactive voltage control method of different reactive compensation devices of wind power delivery |
| CN110266000A (en) * | 2019-06-17 | 2019-09-20 | 国网江苏省电力有限公司 | A kind of out-of-limit analysis of causes method of distribution network voltage, system and storage medium |
-
2021
- 2021-01-15 CN CN202110053023.9A patent/CN112821411B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102593840A (en) * | 2012-02-23 | 2012-07-18 | 中国电力科学研究院 | Voltage-reactive power control method for regional power grid |
| CN102738800A (en) * | 2012-07-05 | 2012-10-17 | 中国电力科学研究院 | Prefecture-county integrated automatic voltage control method |
| WO2014169709A1 (en) * | 2013-04-18 | 2014-10-23 | 国家电网公司 | Reactive voltage optimization control method for centralized grid-integration of wind power and solar power |
| CN105071397A (en) * | 2015-07-27 | 2015-11-18 | 中国电力科学研究院 | Coordinated reactive voltage control method of different reactive compensation devices of wind power delivery |
| CN110266000A (en) * | 2019-06-17 | 2019-09-20 | 国网江苏省电力有限公司 | A kind of out-of-limit analysis of causes method of distribution network voltage, system and storage medium |
Non-Patent Citations (2)
| Title |
|---|
| 交流特高压近区电网自动电压控制研究与实践;王彬;郭庆来;孙宏斌;汤磊;张伯明;吴文传;;电力***自动化(第21期);全文 * |
| 计及大电网安全电压约束的电网自动电压控制研究;韩保军;王彬;代飞;王丹;秦军伟;王磊;;电测与仪表(第16期);全文 * |
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