CN111864761A - Power grid reactive resource optimization scheduling system and method - Google Patents

Power grid reactive resource optimization scheduling system and method Download PDF

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Publication number
CN111864761A
CN111864761A CN202010752161.1A CN202010752161A CN111864761A CN 111864761 A CN111864761 A CN 111864761A CN 202010752161 A CN202010752161 A CN 202010752161A CN 111864761 A CN111864761 A CN 111864761A
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reactive
power grid
power
control module
resource optimization
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金楚
李作红
王新宝
吴伟杰
葛景
韩连山
杨燕
徐蔚
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Guangdong Power Grid Co Ltd
Grid Planning Research Center of Guangdong Power Grid Co Ltd
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Guangdong Power Grid Co Ltd
Grid Planning Research Center of Guangdong Power Grid Co Ltd
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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
    • H02J3/16—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
    • H02J3/12—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
    • H02J3/18—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
    • 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
    • H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
    • 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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  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

The invention discloses a power grid reactive resource optimal scheduling system and a method, wherein the system comprises a reactive resource optimal control module, a region information submodule and a transformer substation comprehensive control module; according to the invention, the operation information of the power grid in different areas is acquired by the area information submodule, the operation information of the power grid is analyzed by the reactive resource optimization control module to obtain the reactive balance condition and the transient voltage stability of the power grid in different areas, on the basis, a reactive control strategy is generated by a multi-objective optimization algorithm, and the reactive compensation equipment of the power grid is controlled by the transformer substation comprehensive control module, so that the voltage stability of the power grid is ensured, meanwhile, the capability of the dynamic reactive compensation equipment of the whole power grid participating in normal power flow fluctuation regulation is fully exerted, the switching times of the static reactive compensation equipment are reduced, the reactive compensation efficiency of the reactive compensation equipment is improved, and the stable operation of the power grid is ensured.

Description

Power grid reactive resource optimization scheduling system and method
Technical Field
The invention relates to the field of electric power, in particular to a power grid reactive resource optimal scheduling system and method.
Background
Energy resources and load requirements in China are in a reverse distribution characteristic, electric energy needs to be transmitted to a load center from a resource enrichment area in a long distance, and a plurality of alternating current-direct current hybrid power grids represented by Guangdong power grids are formed at present. For an alternating current-direct current series-parallel connection receiving end power grid, the voltage stability problem is influenced by alternating current faults and direct current faults at the same time, and the alternating current faults and the direct current faults are mutually interwoven. Therefore, in order to ensure the transient voltage stability of the system, the load center needs to be equipped with a certain capacity of dynamic reactive power compensation device. Since the FACTS concept was proposed in the last century, with the rapid development of power electronic technology, dynamic reactive power compensation devices represented by SVC, SVG, controllable high resistance, UPFC, etc. have been rapidly developed, and have been widely used in China at present. However, with the rapid development of new energy, the daily tidal current fluctuation of a power transmission network is large, so that the system reactive power balance requirement fluctuates greatly. In order to ensure the supporting function of the dynamic reactive power compensation equipment under the transient fault, the dynamic reactive power compensation equipment is usually in a zero reactive power operation mode during normal operation, so that the reactive power change requirement generated by normal tidal current fluctuation is usually realized through switching of the static reactive power compensation equipment, and the problems of frequent fault occurrence and the like caused by high switching frequency of the switch exist, and the safety and stability of the system are seriously influenced.
In order to realize the optimized allocation of the reactive resources of the whole network, when the dynamic reactive compensation equipment is in normal operation, the dynamic reactive compensation equipment can participate in reactive control under the condition of normal tidal current fluctuation to a certain extent on the premise of meeting voltage stability and reactive layering partition, so that the switching frequency of the static compensation equipment is reduced. However, the dynamic reactive power compensation equipment in the existing power grid always starts from the voltage of the alternating current bus of the equipment, and the reactive power balance and voltage stability of the whole power grid cannot be considered from the perspective of a system, so that the running efficiency of the reactive power compensation equipment is low.
In summary, in the prior art, the dynamic reactive power compensation device of the power grid usually starts from the ac bus voltage of the device, and the reactive power balance and voltage stability of the whole power grid cannot be considered from the system perspective, so that the technical problem of low reactive power compensation efficiency exists.
Disclosure of Invention
The invention provides a power grid reactive resource optimization scheduling system and method, which are used for solving the technical problem that in the prior art, dynamic reactive compensation equipment of a power grid always starts from the voltage of an alternating current bus of the dynamic reactive compensation equipment, the reactive balance and voltage stability of the whole power grid cannot be considered from the perspective of a system, and the reactive compensation efficiency is low.
The invention provides a power grid reactive resource optimization scheduling system which comprises a reactive resource optimization control module, N area information submodules and a transformer substation comprehensive control module, wherein each area information submodule is arranged in a different area of a power grid;
the region information submodule is used for acquiring the operation information of the power grid of the region where the region is located, sending the operation information of the power grid of the region where the region is located to the reactive resource optimization control module, and forwarding the reactive control strategy issued by the reactive resource optimization control module to the transformer substation comprehensive control module;
the reactive resource optimization control module is used for receiving the operation information of the power grid sent by the regional information submodule, analyzing and calculating the operation information of the power grid to obtain reactive balance conditions and transient voltage stability of the power grid in different regions of the power grid, generating a reactive control strategy according to the reactive balance conditions and the transient voltage stability of the power grid in the different regions of the power grid, and sending the reactive control strategy to the regional information submodule;
and the transformer substation comprehensive control module is used for receiving the reactive power control strategy sent by the regional information submodule, controlling the reactive power compensation equipment of the power grid according to the reactive power control strategy and realizing the optimal scheduling of reactive power resources.
Preferably, the operation information of the power grid includes: the power of the power grid inlet and outlet lines, the power of the main transformer station on and off the grid and the operation information of the reactive power equipment of the power grid.
Preferably, the operation information of the reactive equipment in the power grid comprises the switching information, the switching capacity and the configuration of the reactive equipment.
Preferably, the specific process of analyzing and calculating the operation information grid of the power grid by the reactive resource optimization control module to obtain the reactive balance conditions of different areas of the power grid is as follows:
the reactive resource optimization control module obtains reactive power tidal current values of different areas of the power grid according to the operation information of the power grid of the different areas;
calculating reactive exchange quantities of different areas of the power grid according to the reactive power flow values of the different areas of the power grid;
and evaluating the reactive power balance condition of the power grid according to the reactive power exchange quantities of different areas of the power grid.
Preferably, the specific process of analyzing and calculating the operation information power grid of the power grid by the reactive resource optimization control module to obtain the transient voltage stability of the power grid is as follows:
generating tide mode data and transient stability analysis data according to the operation information of the power grid;
and calculating the voltage stability of the power grid under a preset fault set according to the load flow mode data and the transient stability analysis data.
Preferably, the preset fault set comprises a 500kV line and transformer N-1 fault, a 500kV line and transformer N-2 fault, a direct current lockout failure fault, a direct current commutation failure fault and a 500kV transformer substation outgoing line three-phase short circuit single-phase switch failure fault.
Preferably, the specific process of the reactive resource optimization control module generating the reactive control strategy according to the reactive balance condition of the power grid and the transient voltage stability of the power grid is as follows:
the reactive resource optimization control module carries out multi-objective optimization calculation on the reactive balance condition of the power grid and the transient voltage stability of the power grid to obtain a static reactive power switching strategy and a dynamic reactive power control instruction, namely a reactive power control strategy.
Preferably, the reactive resource optimization control module takes the maximum switching capacity of the static reactive compensation equipment of the power grid and the output range of the dynamic reactive compensation equipment of the power grid as constraint conditions in the process of carrying out multi-objective optimization calculation.
Preferably, data transmission is performed between the reactive resource optimization control module and the regional information sub-module, and between the regional information sub-module and the comprehensive control module of the transformer substation by using a GOOSE transmission protocol based on IEC 61850.
A power grid reactive resource optimal scheduling method is suitable for the power grid reactive resource optimal scheduling system, and comprises the following steps:
the region information submodule acquires the operation information of the power grid of the region where the region is located and sends the operation information of the power grid of the region where the region is located to the reactive resource optimization control module;
the reactive resource optimization control module receives the operation information of the power grid sent by the regional information submodule, analyzes and calculates the operation information of the power grid to obtain reactive balance conditions and transient voltage stability of the power grid in different regions of the power grid, generates a reactive control strategy according to the reactive balance conditions and the transient voltage stability of the power grid in the different regions of the power grid, and sends the reactive control strategy to the regional information submodule;
the regional information submodule forwards a reactive power control strategy issued by the reactive power resource optimization control module to the comprehensive control module of the transformer substation;
and the transformer substation comprehensive control module receives the reactive power control strategy sent by the regional information submodule, controls the reactive power compensation equipment of the power grid according to the reactive power control strategy and realizes the optimal scheduling of reactive power resources.
According to the technical scheme, the embodiment of the invention has the following advantages:
according to the embodiment of the invention, the operation information of the power grid in different areas is collected and analyzed to obtain the reactive power balance conditions and the transient voltage stability of the power grid in different areas of the power grid, and on the basis, the reactive power control strategy is generated through the multi-objective optimization algorithm to control the reactive power compensation equipment of the power grid, so that the voltage stability of the power grid is ensured, the capability of the dynamic reactive power compensation equipment of the whole power grid participating in normal power flow fluctuation regulation is fully exerted, the switching times of the static reactive power compensation equipment are reduced, the reactive power compensation efficiency of the reactive power compensation equipment is improved, and the stable operation of the power grid is ensured.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a system framework diagram of a system and a method for optimal scheduling of reactive resources of a power grid according to an embodiment of the present invention.
Fig. 2 is a flowchart of a method and a system for optimal scheduling of reactive power resources of a power grid according to an embodiment of the present invention.
Detailed Description
The embodiment of the invention provides a power grid reactive resource optimization scheduling system and a power grid reactive resource optimization scheduling method, which are used for solving the technical problem that in the prior art, dynamic reactive compensation equipment of a power grid always starts from the voltage of an alternating current bus of the dynamic reactive compensation equipment, and the reactive balance and voltage stability conditions of the whole power grid cannot be considered from the system perspective, so that the reactive compensation efficiency is low.
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the embodiments described below are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
Referring to fig. 1, fig. 1 is a system framework diagram of a system and a method for optimal scheduling of reactive power resources of a power grid according to an embodiment of the present invention.
The power grid reactive resource optimization scheduling system provided by the embodiment of the invention comprises a reactive resource optimization control module 2, N regional information submodules 3 and a transformer substation comprehensive control module 1, wherein each regional information submodule is arranged in a different region of a power grid;
each region information submodule is used for communicating with an automatic voltage reactive power control system 4(AVC system) and a dispatching automation system 5, acquiring the operation information of the power grid of the region where the submodule is located from the automatic voltage reactive power control system and the dispatching automation system, and sending the acquired operation information of the power grid to a reactive resource optimization control module 2; forwarding the reactive power control strategy issued by the reactive power resource optimization control module 2 to the comprehensive control module 1 of the transformer substation;
the reactive resource optimization control module 2 is configured to receive the operation information of the power grid sent by each regional information submodule 3, analyze and roll the operation information power grid of the power grid in different regions to obtain reactive balance conditions and transient voltage stability of the power grid in different regions of the power grid, generate a reactive control strategy by using a multi-objective optimization algorithm according to the reactive balance conditions and the transient voltage stability of the power grid, and send the generated reactive control strategy to the regional information submodules 3; the reactive power control strategy comprises a static reactive power switching strategy and a dynamic reactive power control instruction.
The transformer substation integrated control module 1 is used for receiving the reactive power control strategy sent by the regional information submodule 3 and controlling the switching state of the static reactive power equipment and the reactive power input by the dynamic reactive power compensation equipment according to the static reactive power switching strategy and the dynamic reactive power control instruction, so that the optimal scheduling of reactive power resources is realized.
It should be further explained that, the specific working principle of the power grid reactive resource optimization scheduling system provided in this embodiment is as follows:
each area information submodule 3 is communicated with an automatic voltage reactive power control system 4(AVC system) and a dispatching automation system 5, the operation information of the power grid of the area where the submodule is located is collected from the automatic voltage reactive power control system 4 and the dispatching automation system 5, the collected operation information of the power grid is sent to a reactive resource optimization control module 2, the reactive resource optimization control module 2 receives the operation information of the power grid sent by each area information submodule 3, the operation information power grid of the power grid of different areas is analyzed and calculated in a rolling mode to obtain the reactive power balance conditions and the transient voltage stability of the power grid, a reactive power control strategy is generated by adopting a multi-objective optimization algorithm according to the reactive power balance conditions and the transient voltage stability of the power grid, and the generated reactive power control strategy is sent to the area information submodule 3, the regional information submodule 3 forwards the reactive power control strategy issued by the reactive power resource optimization control module 2 to the comprehensive control module 1 of the transformer substation; the reactive power control strategy comprises a static reactive power switching strategy and a dynamic reactive power control instruction; the transformer substation integrated control module 1 receives the reactive power control strategy sent by the regional information submodule 3, and controls the switching state of the static reactive power compensation equipment and the reactive power input by the dynamic reactive power compensation equipment according to the static reactive power switching strategy and the dynamic reactive power control instruction, so that the optimal scheduling of reactive power resources is realized.
The power grid reactive resource optimization scheduling system is a preventive control system; when the alternating current and direct current faults occur in the power grid, the dynamic reactive power compensation equipment automatically shields the reactive power control strategy sent out by the power grid reactive power resource optimization scheduling system, the emergency voltage control is adopted to provide dynamic support for the voltage of the power grid in real time, and the reactive power control strategy sent out by the power grid reactive power resource optimization scheduling system is canceled after the voltage of the power grid is recovered to be normal.
Example 2
Referring to fig. 1, fig. 1 is a system framework diagram of a system and a method for optimal scheduling of reactive power resources of a power grid according to an embodiment of the present invention.
The power grid reactive resource optimization scheduling system provided by the embodiment of the invention comprises a reactive resource optimization control module 2, N regional information submodules 3 and a transformer substation comprehensive control module 1, wherein each regional information submodule 3 is arranged in different regions of a power grid; the reactive resource optimization control module 2, the regional information sub-module 3 and the transformer substation integrated control module 1 are all in data transmission by adopting a GOOSE transmission protocol based on IEC61850, the GOOSE transmission protocol adopts network signals to replace a communication mode of hard wiring among conventional transformer substation devices, and the wiring of secondary cables of the transformer substation is greatly simplified;
each region information submodule 3 is used for communicating with an automatic voltage reactive power control system 4(AVC system) and a dispatching automation system 5, and acquiring operation information of a power grid of a region where the region is located from the automatic voltage reactive power control system 4 and the dispatching automation system 5, wherein the information acquired from the dispatching automation system 5 includes: acquiring operation information of reactive equipment of the power grid from an AVC system, wherein the operation information comprises switching information, switching capacity and configuration of the reactive equipment; the collected operation information of the power grid is sent to the reactive resource optimization control module 2; forwarding the reactive power control strategy issued by the reactive power resource optimization control module 2 to the comprehensive control module 1 of the transformer substation;
the reactive resource optimization control module 2 is configured to receive the operation information of the power grid sent by each regional information submodule 3, analyze and roll the operation information power grid of the power grid in different regions to obtain reactive balance conditions and transient voltage stability of the power grid in different regions of the power grid, generate a reactive control strategy by using a multi-objective optimization algorithm according to the reactive balance conditions and the transient voltage stability of the power grid, and send the generated reactive control strategy to the regional information submodules 3; the reactive power control strategy comprises a static reactive power switching strategy and a dynamic reactive power control instruction.
It should be further explained that the specific process of obtaining the reactive power balance condition of the power grid by the reactive power resource optimization control module 2 is as follows:
and obtaining reactive power flow values of different areas of the power grid according to the operation information of the reactive power equipment of the power grid, calculating reactive power exchange quantities of different areas of the power grid according to the reactive power flow values of different areas of the power grid, wherein the sum of the reactive power flow values of the tie lines among different areas is the reactive power exchange quantity.
Evaluating the reactive power balance condition of the power grid according to the reactive power exchange quantities of different areas of the power grid, and if the reactive power exchange quantities of the different areas of the power grid are not greatly different, determining that the power grid is in a reactive power balance state; if the difference of the reactive power exchange quantities between different areas of the power grid is large, the power grid can be considered to be in a reactive power unbalance state.
The specific process of calculating the transient voltage stability of the power grid by the reactive resource optimization control module 2 is as follows:
generating tide mode data and transient stability analysis data according to the operation information of the power grid;
the method comprises the following steps of calculating the voltage stability of a power grid under a preset fault set according to trend mode data and transient stability analysis data, wherein the preset fault set comprises a 500kV line and transformer N-1 fault, a 500kV line and transformer N-2 fault, a direct current blocking failure fault, a direct current commutation failure fault and a 500kV transformer substation outgoing line three-phase short circuit single-phase switch failure fault, in actual operation, the fault set can be expanded according to actual needs, and the specific process of calculating the voltage stability is as follows:
simulating a preset fault set, calculating a voltage simulation value of the power grid under the preset fault set according to the load flow mode data and the transient stability analysis data, and calculating an alternating current bus voltage recovery index V in different regions of the power grid according to the voltage simulation valueestThrough VestTo describe the transient voltage stability of the power grid, a specific calculation formula is as follows:
Figure BDA0002610382670000071
wherein, VitFor the voltage value of the high-voltage side bus of the main transformer of the ith transformer substation at the t moment,
Figure BDA0002610382670000072
the initial voltage value of the power flow of the main transformer high-voltage side bus of the ith transformer substation can be obtained from the power flow mode data t0For the time of fault clearance, T is the total simulation duration, biAnd N is the calculated weight of the substation, and is the number of the regional substations.
After the reactive power balance condition and the transient voltage stability of the power grid are obtained, the reactive resource optimization control module 2 carries out multi-objective optimization calculation, and the method for the multi-objective optimization calculation comprises the following steps: obtaining a static reactive power switching strategy and a dynamic reactive power control instruction Q by a multi-index multiplication-division method, a weighting method and a sequence optimization methodorderNamely, the reactive power control strategy, the specific calculation process is as follows:
maxf(x,u)
Figure BDA0002610382670000081
wherein x is a variable of the running state of the power grid, such as a voltage amplitude value, a phase angle and the like; u is the running electric quantity of the reactive compensation equipment, and the reactive compensation equipment comprises static reactive compensation equipment and dynamic reactive compensation equipment; f (x, u) is a multi-objective optimization function, and g (x, u) is 0 to indicate that the power grid meets the constraint of a power flow equation; si(x,u)≥σs,iIndicates that the voltage stability constraint, σ, is satisfieds,iRepresents a voltage stability margin lower limit; h (x, u) is less than or equal to 0 to represent a constraint condition, wherein the constraint condition is the maximum switching capacity of the static reactive power compensation equipment of the power grid and the output range of the dynamic reactive power compensation equipment of the power grid; the static reactive compensation equipment comprises a low-voltage capacitor and a low-voltage reactor, and the dynamic reactive compensation equipment comprises an SVC (static var compensator), an SVG (static var compensator), a controllable high-voltage reactor, a phase modulator and a generator.
The objective function using multiplication and division is:
Figure BDA0002610382670000082
wherein Q isexFor reactive exchange Q of different areas of the networkex、NtqSwitching volume, V, for static reactive power compensation equipmentestAs an index of bus voltage restorability, K1、K2、K3Respectively being reactive exchange QexSwitching quantity N of static reactive power compensation equipmenttqAC bus voltage recovery index VestThe conversion factor of (c).
The reactive resource optimization control module 2 finally obtains a static reactive power switching strategy and a dynamic reactive power control instruction which meet the optimal target through multi-target optimization calculation, wherein the dynamic reactive power control instruction is obtained by solving a multi-target optimization function f (x, u) and is sent to each substation control system through the regional information substation.
The transformer substation integrated control module 1 is used for receiving the reactive power control strategy sent by the regional information submodule 3 and controlling the switching state of the static reactive power equipment and the reactive power input by the dynamic reactive power compensation equipment according to the static reactive power switching strategy and the dynamic reactive power control instruction, so that the optimal scheduling of reactive power resources is realized.
It needs to be further explained that the power grid reactive resource optimization scheduling system is a preventive control system; when the alternating current and direct current faults occur in the power grid, the dynamic reactive power compensation equipment automatically shields the reactive power control strategy sent out by the power grid reactive power resource optimization scheduling system, the emergency voltage control is adopted to provide dynamic support for the voltage of the power grid in real time, and the reactive power control strategy sent out by the power grid reactive power resource optimization scheduling system is canceled after the voltage of the power grid is recovered to be normal.
As shown in fig. 2, a method for optimally scheduling power grid reactive resources, which is suitable for the above-mentioned system for optimally scheduling power grid reactive resources, includes the following steps:
the regional information submodule acquires the operation information of the power grid and sends the operation information of the power grid to the reactive resource optimization control module;
the reactive resource optimization control module receives the operation information of the power grid sent by the regional information submodule, analyzes and calculates the operation information of the power grid to obtain the reactive balance condition and the transient voltage stability of the power grid, generates a reactive control strategy according to the reactive balance condition and the transient voltage stability of the power grid, and sends the reactive control strategy to the regional information submodule;
the regional information submodule forwards a reactive power control strategy issued by the reactive power resource optimization control module to the comprehensive control module of the transformer substation;
and the transformer substation comprehensive control module receives the reactive power control strategy sent by the regional information submodule, controls the reactive power compensation equipment of the power grid according to the reactive power control strategy and realizes the optimal scheduling of reactive power resources.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (10)

1. A power grid reactive resource optimization scheduling system is characterized by comprising a reactive resource optimization control module, N area information submodules and a transformer substation comprehensive control module, wherein each area information submodule is arranged in a different area of a power grid;
the region information submodule is used for acquiring the operation information of the power grid of the region where the region is located, sending the operation information of the power grid of the region where the region is located to the reactive resource optimization control module, and forwarding the reactive control strategy issued by the reactive resource optimization control module to the transformer substation comprehensive control module;
the reactive resource optimization control module is used for receiving the operation information of the power grid sent by the regional information submodule, analyzing and calculating the operation information of the power grid to obtain reactive balance conditions and transient voltage stability of the power grid in different regions of the power grid, generating a reactive control strategy according to the reactive balance conditions and the transient voltage stability of the power grid in the different regions of the power grid, and sending the reactive control strategy to the regional information submodule;
and the transformer substation comprehensive control module is used for receiving the reactive power control strategy sent by the regional information submodule, controlling the reactive power compensation equipment of the power grid according to the reactive power control strategy and realizing the optimal scheduling of reactive power resources.
2. The system according to claim 1, wherein the operation information of the power grid comprises: the power of the power grid inlet and outlet lines, the power of the main transformer station on and off the grid and the operation information of the reactive power equipment of the power grid.
3. The system according to claim 2, wherein the operation information of the grid reactive power equipment comprises switching information, switching capacity and configuration of the reactive power equipment.
4. The power grid reactive resource optimization scheduling system of claim 3, wherein the reactive resource optimization control module is specifically configured to:
obtaining reactive power flow values of different areas of the power grid according to the operation information of the power grid of the different areas;
calculating reactive exchange quantities of different areas of the power grid according to the reactive power flow values of the different areas of the power grid;
and evaluating the reactive power balance condition of the power grid according to the reactive power exchange quantities of different areas of the power grid.
5. The power grid reactive resource optimization scheduling system of claim 1, wherein the reactive resource optimization control module is specifically configured to:
generating tide mode data and transient stability analysis data according to the operation information of the power grid;
and calculating the voltage stability of the power grid under a preset fault set according to the load flow mode data and the transient stability analysis data.
6. The power grid reactive resource optimization scheduling system of claim 5, wherein the preset fault set comprises a 500kV line and transformer N-1 fault, a 500kV line and transformer N-2 fault, a direct current blocking failure fault, a direct current commutation failure fault, and a 500kV substation outgoing line three-phase short circuit single-phase switch operation rejection fault.
7. The power grid reactive resource optimization scheduling system of claim 1, wherein the reactive resource optimization control module is specifically configured to:
and performing multi-objective optimization calculation on the reactive power balance condition of the power grid and the transient voltage stability of the power grid to obtain a static reactive power switching strategy and a dynamic reactive power control instruction, namely a reactive power control strategy.
8. The power grid reactive resource optimization scheduling system of claim 6, wherein the reactive resource optimization control module takes the maximum switching capacity of the static reactive compensation equipment of the power grid and the output range of the dynamic reactive compensation equipment of the power grid as constraint conditions in the process of performing the multi-objective optimization calculation.
9. The power grid reactive resource optimization scheduling system of claim 1, wherein data transmission is performed between the reactive resource optimization control module and the regional information sub-module, and between the regional information sub-module and the substation integrated control module by using an IEC 61850-based GOOSE transmission protocol.
10. A power grid reactive resource optimal scheduling method is applicable to the power grid reactive resource optimal scheduling system of any one of claims 1 to 9, and is characterized by comprising the following steps:
the region information submodule acquires the operation information of the power grid of the region where the region is located and sends the operation information of the power grid of the region where the region is located to the reactive resource optimization control module;
the reactive resource optimization control module receives the operation information of the power grid sent by the regional information submodule, analyzes and calculates the operation information of the power grid to obtain reactive balance conditions and transient voltage stability of the power grid in different regions of the power grid, generates a reactive control strategy according to the reactive balance conditions and the transient voltage stability of the power grid in the different regions of the power grid, and sends the reactive control strategy to the regional information submodule;
the regional information submodule forwards a reactive power control strategy issued by the reactive power resource optimization control module to the comprehensive control module of the transformer substation;
and the transformer substation comprehensive control module receives the reactive power control strategy sent by the regional information submodule, controls the reactive power compensation equipment of the power grid according to the reactive power control strategy and realizes the optimal scheduling of reactive power resources.
CN202010752161.1A 2020-07-30 2020-07-30 Power grid reactive resource optimization scheduling system and method Pending CN111864761A (en)

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