Conventional power plant voltage control method, device and equipment based on double instructions and medium

Abstract

The invention discloses a conventional power plant voltage control method and device based on double instructions, equipment and a medium, and relates to the technical field of power grid dispatching. Then, generating a voltage control target value of a conventional power plant high-voltage side control bus according to the sensitivity, the unit regulation capability and the pilot bus voltage optimization target value, selecting an available high-voltage side control bus according to a substation uploading number, and collecting a bus voltage value; and finally, an incremental coding control instruction and a control target value instruction are generated and issued to a conventional power plant AVC substation. The AVC master station does not directly issue the optimized target value for controlling the high-voltage bus of the generator, and the conditions of inconsistent voltage regulation directions and voltage over-regulation can be avoided through the incremental coding control instruction and the target coding control instruction, so that the safety of reactive voltage control is improved, and the operation stability of a power system is improved.

Description

Technical Field

[0001] The present application relates to the technical field of power grid dispatching, and in particular to a conventional power plant voltage control method, device, equipment and medium based on dual instructions. Background Art

[0002] With the development of power grid dispatching technology, the Automatic Voltage Control (AVC) system, as an important means to achieve safe, economical and high-quality operation of the transmission network, can improve voltage stability margin, reduce network losses and improve voltage qualification rate. The AVC system is based on the Energy Management System (EMS) of the power grid. It can use the real-time operation data of the transmission network to scientifically decide the best reactive voltage adjustment plan from the perspective of global optimization of the transmission network, and automatically send it to conventional power plants, substations and lower-level power grid dispatching organizations for execution.

[0003] In the related art, the voltage control strategy of the AVC system for the transmission network includes the reactive power control strategy for each generator in a conventional power plant and the reactive equipment control strategy for the substation. Among them, the reactive power control strategy for each generator in a conventional power plant is as follows: the AVC master station system obtains the reactive power adjustment amount of each generator set in the conventional power plant through reactive power optimization calculation and sends it to the AVC substation system through the data communication channel. The AVC substation system adjusts the reactive power generated by the generator in a step-by-step manner according to the operating status of each generator in the current conventional power plant until the adjustment amount issued by the AVC master station system is reached. The reactive equipment control strategy for the substation is as follows: the AVC master station system issues an instruction to put the reactive equipment into operation or cut off. The automated monitoring system in the substation finds the circuit breaker connected to the reactive equipment and closes or opens the circuit breaker according to the received instruction to complete the putting the reactive equipment into operation or cutting off.

[0004] In the process of implementing this application, the applicant found that the related technology has at least the following problems:

[0005] When the data sources of the AVC master station and the AVC substation are different, there may be measurement errors. If the optimization target value of the high-voltage busbar of the generator is directly issued, incorrect voltage regulation direction will be generated. Moreover, due to interference in the communication channel, the AVC substation may receive continuous identical control instructions. At this time, the AVC substation cannot determine whether the control instruction is a repeated instruction, which may cause the overregulation of the high-voltage busbar voltage of the generator or the opposite regulation direction of the AVC master station, resulting in low efficiency and accuracy of automatic voltage control. Summary of the invention

[0006] In view of this, the present application provides a conventional power plant voltage control method, device, equipment and medium based on dual instructions, the main purpose of which is to solve the problem of inconsistent control targets between the AVC master station and the AVC substation of the conventional power plant in the automatic voltage control of the conventional power plant.

[0007] According to a first aspect of the present application, a conventional power plant voltage control method based on dual instructions is provided, the method comprising:

[0008] Obtaining a conventional power plant control area model, and based on the conventional power plant control area model, performing an optimal power flow calculation on the power system to obtain a voltage optimization target value of a target central bus;

[0009] The reactive power sensitivity and unit regulation capability values ​​obtained based on the conventional power plant control area model and the voltage optimization target value of the target central bus are used for secondary planning to obtain the voltage control target value of the target high-voltage side control bus;

[0010] Acquire the voltage value of the high-voltage bus, use the voltage control target value of the target high-voltage side control bus to generate an incremental coding control instruction, and use the voltage value of the high-voltage bus and the voltage control target value of the target high-voltage side control bus to generate a target coding control instruction;

[0011] The incremental coding control instruction and the target coding control instruction are issued to the AVC substation, so that the AVC substation performs voltage control on the target high-voltage side control bus according to the incremental coding control instruction and the target coding control instruction.

[0012] Optionally, obtaining a conventional power plant control area model includes:

[0013] In the power system, a plurality of equipment operating states and a plurality of measurement data are obtained, and the conventional power plant control area model is constructed using the plurality of equipment operating states and the plurality of measurement data, wherein:

[0014]

[0015] Among them, Z 500 is the conventional power plant control area model, is the central bus in the control area of ​​a conventional power plant, C is the total number of central buses, is the controlled generator in the control area of ​​the conventional power plant, N is the total number of conventional power plants, is the high-voltage side control bus in the control area of ​​the conventional power plant, and K is the total number of high-voltage side control buses.

[0016] Optionally, the reactive sensitivity and unit regulation capability value obtained based on the conventional power plant control area model and the voltage optimization target value of the target central bus are used for secondary planning to obtain the voltage control target value of the target high-voltage side control bus, including:

[0017] Obtaining a target controlled generator in the conventional power plant control area model;

[0018] Determine the reactive voltage sensitivity of the target controlled generator to the target central bus based on the conventional power plant control area model, and determine the reactive sensitivity of the target controlled generator to the target high-voltage side control bus using the reactive voltage sensitivity;

[0019] Acquire the unit regulation capability value of the target controlled generator based on the conventional power plant control area model, wherein the unit regulation capability value includes an increaseable reactive power value and a decreaseable reactive power value;

[0020] The maximum increase amount is determined by using the increaseable reactive power value of the target controlled generator and the reactive power sensitivity, wherein:

[0021]

[0022] in, is the maximum upward adjustment of the target high-voltage side control bus k, The reactive power value that can be increased by controlling the generator g for the target, The reactive sensitivity of the target controlled generator g to the target high-voltage side controlled bus k;

[0023] The maximum reduction amount is determined by using the deductible reactive value of the target controlled generator and the reactive sensitivity, wherein:

[0024]

[0025] in, is the maximum downward adjustment of the target high-voltage side control bus k, The deductible reactive power value of the generator g is controlled for the target, The reactive sensitivity of the target controlled generator g to the target high-voltage side controlled bus k;

[0026] Secondary programming is performed on the maximum upward regulation amount, the maximum downward regulation amount and the voltage optimization target value of the target central bus to obtain the voltage control target value of the target high-voltage side control bus.

[0027] Optionally, performing secondary programming on the maximum upward adjustment, the maximum downward adjustment and the voltage optimization target value of the target central bus to obtain the voltage control target value of the target high-voltage side control bus includes:

[0028] Get the objective function, where

[0029]

[0030]

[0031] Among them, ΔQ g is the reactive power output adjustment amount of the target control generator g, V P is the current voltage of the target central bus, is the set voltage of the target central bus, C g is the reactive voltage sensitivity of the target control generator g to the target central bus, W p is the first weight coefficient, W q is the second weight coefficient, α is the gain coefficient, Θ g is the reactive power margin vector, is the i-th component of the reactive margin vector, is the reactive power output regulation of the ith component, is the current reactive power of the ith component, is the reactive power lower limit of the ith component, is the reactive upper limit of the i-th component;

[0032] Get the constraint function, where

[0033]

[0034] Among them, ΔQ g The reactive power output adjustment amount of the target control generator g, C g is the reactive voltage sensitivity of the target control generator g to the target central bus, C vg is the reactive voltage sensitivity of the target controlled generator g to the target high-voltage side control bus, V P is the current voltage of the target central bus, is the voltage lower limit of the target central bus, is the voltage upper limit of the target central bus, V H is the current voltage of the target high-voltage side control bus, is the voltage lower limit of the target high-voltage side control bus, is the voltage upper limit of the target high-voltage side control bus, is the single-step maximum adjustment of the target high-voltage side control bus, Q g Control the current reactive power of the generator g for the target, The reactive power lower limit of the generator g is controlled for the target, Controlling the reactive power upper limit of the generator g for the target;

[0035] The objective function and the constraint function are used to calculate the maximum upward adjustment amount, the maximum downward adjustment amount and the voltage optimization target value of the target central bus to obtain the voltage control target value of the target high-voltage side control bus.

[0036] Optionally, obtaining the high-voltage bus voltage value includes:

[0037] Obtain the high-voltage side control bus number sent by the AVC substation, and determine the designated high-voltage side control bus in the conventional power plant control area model according to the high-voltage side control bus number;

[0038] The voltage measurement value of the designated high-voltage side control bus is collected to obtain the voltage value of the high-voltage bus.

[0039] Optionally, the step of using the voltage control target value of the target high-voltage side control bus to generate an incremental coded control instruction, and using the high-voltage bus voltage value and the voltage control target value of the target high-voltage side control bus to generate a target coded control instruction, comprises:

[0040] The voltage control target value of the target high-voltage side control bus is calculated to obtain a control increment value, wherein:

[0041]

[0042] in, is the control increment value of the target high-voltage side control bus k, ΔV k is the voltage control target value of the target high-voltage side control bus k;

[0043] Determine the adjustment direction of the target high-voltage side control bus, wherein:

[0044]

[0045] Where, ΔV k is the voltage control target value of the target high-voltage side control bus k, V f Controlling the adjustment direction of the target high-voltage side bus k;

[0046] Acquire an incremental coding control rule, and generate the incremental coding control instruction according to the incremental coding control rule by using the control incremental value and the adjustment direction;

[0047] The high-voltage bus voltage value and the target voltage control value of the target high-voltage side control bus are calculated to obtain a control target value, wherein:

[0048]

[0049] in, is the control target value of the target high-voltage side control bus k, ΔV k is the voltage control target value of the target high-voltage side control bus k, is the high voltage bus voltage value;

[0050] A control target coding rule is obtained, and according to the control target coding rule, the control target value is used to generate the target coding control instruction.

[0051] Optionally, after sending the incremental encoding control instruction and the target encoding control instruction to the AVC substation, the method further includes:

[0052] Acquire an incremental coding rule based on the AVC substation, and decode and parse the incremental coding control instruction using the incremental coding rule to obtain a bus voltage control incremental value;

[0053] Acquire a control target rule based on the AVC substation, and decode and parse the target coded control instruction using the control target rule to obtain a bus voltage control target value;

[0054] Based on the AVC substation, the current voltage measurement value of the target high-voltage side control bus is collected, and the sum of the current voltage measurement value and the bus voltage control increment value is compared with the bus voltage control target value;

[0055] If it is determined based on the AVC substation that the sum of the current voltage measurement value and the bus voltage control increment value is greater than the bus voltage control target value, then the bus voltage control increment value is used to generate an execution instruction;

[0056] If it is determined based on the AVC substation that the sum of the current voltage measurement value and the bus voltage control increment value is less than the bus voltage control target value, the bus voltage control target value is used to generate an execution instruction.

[0057] According to a second aspect of the present application, a conventional power plant voltage control device based on dual instructions is provided, the device comprising:

[0058] The first calculation module is used to obtain a conventional power plant control area model, and based on the conventional power plant control area model, perform optimal power flow calculation on the power system to obtain a voltage optimization target value of a target central bus;

[0059] The second calculation module is used to perform secondary planning using reactive sensitivity and unit regulation capability values ​​obtained based on the conventional power plant control area model and the voltage optimization target value of the target central bus to obtain the voltage control target value of the target high-voltage side control bus;

[0060] A generating module, used for acquiring a high-voltage bus voltage value, using the voltage control target value of the target high-voltage side control bus to generate an incremental coding control instruction, and using the high-voltage bus voltage value and the voltage control target value of the target high-voltage side control bus to generate a target coding control instruction;

[0061] The sending module is used to send the incremental coding control instruction and the target coding control instruction to the AVC substation, so that the AVC substation controls the voltage of the target high-voltage side control bus according to the incremental coding control instruction and the target coding control instruction.

[0062] Optionally, the first calculation module is used to obtain multiple equipment operating states and multiple measurement data in the power system, and use the multiple equipment operating states and multiple measurement data to construct the conventional power plant control area model, wherein:

[0063]

[0064] Among them, Z 500 is the conventional power plant control area model, is the central bus in the control area of ​​a conventional power plant, C is the total number of central buses, is the controlled generator in the control area of ​​the conventional power plant, N is the total number of conventional power plants, is the high-voltage side control bus in the control area of ​​the conventional power plant, and K is the total number of high-voltage side control buses.

[0065] Optionally, the second calculation module is used to obtain the target controlled generator in the conventional power plant control area model; determine the reactive voltage sensitivity of the target controlled generator to the target central bus based on the conventional power plant control area model, and use the reactive voltage sensitivity to determine the reactive sensitivity of the target controlled generator to the target high-voltage side control bus; obtain the unit adjustment capability value of the target controlled generator based on the conventional power plant control area model, and the unit adjustment capability value includes an increaseable reactive value and a decreaseable reactive value; use the increaseable reactive value of the target controlled generator and the reactive sensitivity to calculate and determine the maximum increase amount, wherein,

[0066]

[0067] in, is the maximum upward adjustment of the target high-voltage side control bus k, The reactive power value that can be increased by controlling the generator g for the target, is the reactive sensitivity of the target controlled generator g to the target high-voltage side controlled bus k; the maximum down-regulation amount is determined by calculating the deductible reactive value of the target controlled generator and the reactive sensitivity, wherein:

[0068]

[0069] in, is the maximum downward adjustment of the target high-voltage side control bus k, The deductible reactive power value of the generator g is controlled for the target, The reactive sensitivity of the target controlled generator g to the target high-voltage side control bus k is obtained; the maximum upward adjustment amount, the maximum downward adjustment amount and the voltage optimization target value of the target central bus are secondary planned to obtain the voltage control target value of the target high-voltage side control bus.

[0070] Optionally, the second calculation module is used to obtain an objective function, wherein:

[0071]

[0072] Among them, ΔQ g is the reactive power output adjustment amount of the target control generator g, V P is the current voltage of the target central bus, is the set voltage of the target central bus, C g is the reactive voltage sensitivity of the target control generator g to the target central bus, W p is the first weight coefficient, W q is the second weight coefficient, α is the gain coefficient, Θ g is the reactive power margin vector, is the i-th component of the reactive margin vector, is the reactive power output regulation of the ith component, is the current reactive power of the ith component, is the reactive power lower limit of the ith component, is the reactive upper limit of the i-th component; obtain the constraint function, where,

[0073]

[0074] Among them, ΔQ g The reactive power output adjustment amount of the target control generator g, C g is the reactive voltage sensitivity of the target control generator g to the target central bus, C vg is the reactive voltage sensitivity of the target controlled generator g to the target high-voltage side control bus, V P is the current voltage of the target central bus, is the voltage lower limit of the target central bus, is the voltage upper limit of the target central bus, V h is the current voltage of the target high-voltage side control bus, is the voltage lower limit of the target high-voltage side control bus, is the voltage upper limit of the target high-voltage side control bus, is the single-step maximum adjustment of the target high-voltage side control bus, Q g Control the current reactive power of the generator g for the target, The reactive power lower limit of the generator g is controlled for the target, is the reactive power upper limit of the target controlled generator g; the objective function and the constraint function are used to calculate the maximum upward adjustment, the maximum downward adjustment and the voltage optimization target value of the target central bus to obtain the voltage control target value of the target high-voltage side control bus.

[0075] Optionally, the generation module is used to obtain the high-voltage side control bus number sent by the AVC substation, determine the designated high-voltage side control bus in the conventional power plant control area model according to the high-voltage side control bus number; collect the voltage measurement value of the designated high-voltage side control bus to obtain the high-voltage bus voltage value.

[0076] Optionally, the generating module is used to calculate the voltage control target value of the target high-voltage side control bus to obtain a control increment value, wherein:

[0077]

[0078] in, is the control increment value of the target high-voltage side control bus k, ΔV k is the voltage control target value of the target high-voltage side control bus k; determines the adjustment direction of the target high-voltage side control bus, wherein,

[0079]

[0080] Where, ΔV k is the voltage control target value of the target high-voltage side control bus k, V f is the adjustment direction of the target high-voltage side control bus k; obtains the incremental coding control rule, and generates the incremental coding control instruction according to the incremental coding control rule by using the control increment value and the adjustment direction; calculates the voltage value of the high-voltage bus and the voltage control target value of the target high-voltage side control bus to obtain the control target value, wherein,

[0081]

[0082] in, is the control target value of the target high-voltage side control bus k, ΔV k is the voltage control target value of the target high-voltage side control bus k, is the voltage value of the high-voltage bus; obtaining a control target coding rule, and according to the control target coding rule, using the control target value to generate the target coding control instruction.

[0083] Optionally, the device further comprises:

[0084] An execution module is used to obtain an incremental coding rule based on the AVC substation, and use the incremental coding rule to decode and parse the incremental coding control instruction to obtain a bus voltage control incremental value; obtain a control target rule based on the AVC substation, and use the control target rule to decode and parse the target coding control instruction to obtain a bus voltage control target value; based on the AVC substation, collect the current voltage measurement value of the target high-voltage side control bus, and compare the sum of the current voltage measurement value and the bus voltage control incremental value with the bus voltage control target value; if it is determined based on the AVC substation that the sum of the current voltage measurement value and the bus voltage control incremental value is greater than the bus voltage control target value, the bus voltage control incremental value is used to generate an execution instruction; if it is determined based on the AVC substation that the sum of the current voltage measurement value and the bus voltage control incremental value is less than the bus voltage control target value, the bus voltage control target value is used to generate an execution instruction.

[0085] According to a third aspect of the present application, a device is provided, including a memory and a processor, wherein the memory stores a computer program, and the processor implements the steps of any one of the methods described in the first aspect when executing the computer program.

[0086] According to a fourth aspect of the present application, a medium is provided, on which a computer program is stored, and when the computer program is executed by a processor, the steps of any one of the methods described in the first aspect are implemented.

[0087] By means of the above-mentioned technical scheme, the present application provides a conventional power plant voltage control method, device, equipment and medium based on dual instructions. The present application obtains a conventional power plant control area model, and based on the conventional power plant control area model, performs optimal power flow calculation on the power system to obtain the voltage optimization target value of the target central bus, and uses the reactive sensitivity and unit regulation capability values ​​obtained based on the conventional power plant control area model and the voltage optimization target value of the target central bus for secondary planning to obtain the voltage control target value of the target high-voltage side control bus, obtain the high-voltage bus voltage value, and use the voltage control target value of the target high-voltage side control bus to generate an incremental coded control instruction, use the high-voltage bus voltage value and the voltage control target value of the target high-voltage side control bus to generate a target coded control instruction, and send the incremental coded control instruction and the target coded control instruction to the AVC substation so that the AVC substation performs voltage control on the target high-voltage side control bus according to the incremental coded control instruction and the target coded control instruction. This application obtains the optimized target value of the central bus voltage in the control area of ​​a conventional power plant based on the optimal power flow calculation, and then generates the voltage control target value of the high-voltage side control bus of the conventional power plant based on the sensitivity, unit regulation capability and the optimized target value of the central bus voltage, and selects the available high-voltage side control bus according to the number sent by the substation, collects the bus voltage value, and finally generates incremental coding control instructions and control target value instructions and sends them to the AVC substation of the conventional power plant. The AVC master station does not directly send the optimized target value of the high-voltage bus of the control generator. The incremental coding control instructions and target coding control instructions can avoid inconsistent voltage regulation directions and voltage overregulation, thereby improving the safety of reactive voltage control and improving the operational stability of the power system.

[0088] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0089] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Also, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0090] Figure 1 A schematic flow chart of a method for conventional power plant voltage control based on dual instructions provided in an embodiment of the present application is shown;

[0091] Figure 2 A schematic flow chart of another conventional power plant voltage control method based on dual instructions provided in an embodiment of the present application is shown;

[0092] Figure 3A A schematic diagram of the structure of a conventional power plant voltage control based on dual instructions provided in an embodiment of the present application is shown;

[0093] Figure 3B A schematic diagram of another conventional power plant voltage control based on dual instructions provided in an embodiment of the present application is shown;

[0094] Figure 4 A schematic diagram of the device structure of a device provided in an embodiment of the present application is shown. DETAILED DESCRIPTION

[0095] The exemplary embodiments of the present application will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present application are shown in the accompanying drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present application and to fully convey the scope of the present application to those skilled in the art.

[0096] The embodiment of the present application provides a conventional power plant voltage control method based on dual instructions, such as Figure 1 As shown, the method includes:

[0097] 101. Obtain a conventional power plant control area model, perform optimal power flow calculation on the power system based on the conventional power plant control area model, and obtain the voltage optimization target value of the target central bus.

[0098] The master station part of the AVC system is implemented based on software in the power system control center. When the AVC system is actually running, when the AVC master station sends control instructions to the AVC substation, when the data sources of the AVC master station and the AVC substation are different, there may be measurement errors. If the optimization target value of the high-voltage bus of the control generator is directly issued, incorrect voltage regulation direction will be generated. For example, the current sampled voltage of the high-voltage bus of the control generator obtained by the AVC master station is 525.5kV, while the current sampled voltage obtained by the AVC substation through another data source is 526.2kV. The optimization target value of the high-voltage bus of the control generator generated by the secondary voltage control calculation on the AVC master station side is 526.0kV, that is, the AVC master station expects the high-voltage bus of the conventional power plant to increase by 0.5kV. However, if the optimization target value of the high-voltage bus of the control generator is 526.0kV, the AVC substation will make an operation to reduce the bus voltage by 0.2kV, which is opposite to the direction of voltage regulation expected by the AVC master station.

[0099] To solve this problem, the present application proposes a conventional power plant voltage control method based on dual instructions, which obtains the operating status and measurement data of each device in the power system, constructs a conventional power plant control area, and then obtains the optimized target value of the central bus voltage in the conventional power plant control area according to the optimal power flow calculation, and generates the voltage control target value of the high-voltage bus of the conventional power plant control generator according to the sensitivity and unit adjustment capability, and then selects the available conventional power plant control generator high-voltage bus according to the substation upload number, and collects the voltage value of the bus voltage, and finally generates the incremental coding control instructions and control target value instructions of the high-voltage bus of the conventional power plant control generator, and sends them to the conventional power plant AVC substation. The conventional power plant AVC substation parses the incremental coding and control target value instructions issued by the master station according to the decoding rules, and generates conventional power plant control instructions, which can deal with the problem of inconsistent control targets between the AVC master station and the conventional power plant AVC substation in the automatic voltage control of the conventional power plant, thereby improving the safety of reactive voltage control, and further improving the operation stability of the power system. The executor of this application may be an AVC master station system, which relies on the computing power of the server to provide services to users. The server may be an independent server or may provide cloud services, cloud databases, cloud computing, cloud functions, cloud storage, network services, cloud communications, middleware services, domain name services, security services, content delivery networks (CDN), as well as servers for basic cloud computing such as big data and artificial intelligence platforms, so that the AVC master station system can accurately realize automatic voltage control of conventional power plants.

[0100] In an embodiment of the present application, the AVC master station system obtains a conventional power plant control area model, and based on the conventional power plant control area model, performs an optimal power flow calculation on the power system to obtain the voltage optimization target value of the target hub bus. Among them, the conventional power plant control area model is constructed using the operating status and measurement data of each device in the power system, which illustrates the control area of ​​the AVC master station system. Moreover, the optimal power flow calculation can optimize the performance indicators of the system while satisfying all constraints by optimizing the selection of control variables, thereby improving the reliability of the AVC master station system.

[0101] 102. The reactive power sensitivity and unit regulation capability values ​​obtained based on the conventional power plant control area model and the voltage optimization target value of the target central bus are used for secondary planning to obtain the voltage control target value of the target high-voltage side control bus.

[0102] In an embodiment of the present application, the AVC master station system uses the reactive sensitivity and unit regulation capability values ​​obtained based on the conventional power plant control area model and the voltage optimization target value of the target central bus for secondary planning to obtain the voltage control target value of the target high-voltage side control bus. The AVC master station system does not directly issue the optimization target value, but performs secondary planning. Through the secondary planning algorithm, it takes the minimum reactive loss as the objective function and considers a series of inequality constraints of voltage and control variables, thereby optimizing reactive loss and improving the economy and overall stability of the power system.

[0103] 103. Obtain the voltage value of the high-voltage bus, use the voltage control target value of the target high-voltage side control bus to generate an incremental coded control instruction, and use the voltage value of the high-voltage bus and the voltage control target value of the target high-voltage side control bus to generate a target coded control instruction.

[0104] In the embodiment of the present application, the AVC master station system obtains the voltage value of the high-voltage bus, uses the voltage control target value of the target high-voltage side control bus to generate an incremental coding control instruction, and uses the voltage value of the high-voltage bus and the voltage control target value of the target high-voltage side control bus to generate a target coding control instruction. The control increment value and adjustment direction of the high-voltage side control bus are determined by the incremental coding control instruction, and the control target value of the high-voltage side control bus is determined by the target coding control instruction, which can solve the problems of inconsistent voltage regulation direction and voltage overregulation, thereby improving the accuracy of reactive voltage control.

[0105] 104. Send the incremental coding control instruction and the target coding control instruction to the AVC substation, so that the AVC substation performs voltage control on the target high-voltage side control bus according to the incremental coding control instruction and the target coding control instruction.

[0106] In an embodiment of the present application, the AVC master station system sends incremental coding control instructions and target coding control instructions to the AVC substation, so that the AVC substation performs voltage control on the target high-voltage side control bus according to the incremental coding control instructions and the target coding control instructions, thereby avoiding inconsistent voltage regulation direction and voltage overregulation, thereby improving the safety of reactive voltage control and enhancing the operating stability of the power system.

[0107] The method provided in the embodiment of the present application obtains a conventional power plant control area model, performs optimal power flow calculation on the power system based on the conventional power plant control area model, obtains the voltage optimization target value of the target central bus, performs secondary planning using the reactive sensitivity and unit regulation capability values ​​obtained based on the conventional power plant control area model and the voltage optimization target value of the target central bus, obtains the voltage control target value of the target high-voltage side control bus, obtains the high-voltage bus voltage value, uses the voltage control target value of the target high-voltage side control bus to generate incremental coded control instructions, uses the high-voltage bus voltage value and the voltage control target value of the target high-voltage side control bus to generate target coded control instructions, and sends the incremental coded control instructions and the target coded control instructions to the AVC substation so that the AVC substation performs voltage control on the target high-voltage side control bus according to the incremental coded control instructions and the target coded control instructions. This application obtains the optimized target value of the central bus voltage in the control area of ​​a conventional power plant based on the optimal power flow calculation, and then generates the voltage control target value of the high-voltage side control bus of the conventional power plant based on the sensitivity, unit regulation capability and the optimized target value of the central bus voltage, and selects the available high-voltage side control bus according to the number sent by the substation, collects the bus voltage value, and finally generates incremental coding control instructions and control target value instructions and sends them to the AVC substation of the conventional power plant. The AVC master station does not directly send the optimized target value of the high-voltage bus of the control generator. The incremental coding control instructions and target coding control instructions can avoid inconsistent voltage regulation directions and voltage overregulation, thereby improving the safety of reactive voltage control and improving the operational stability of the power system.

[0108] Further, as a refinement and expansion of the specific implementation of the above embodiment, in order to fully illustrate the specific implementation process of this embodiment, the embodiment of the present application provides another conventional power plant voltage control method based on dual instructions, such as Figure 2 As shown, the method includes:

[0109] 201. Acquire multiple equipment operating states and multiple measurement data in the power system, and use the multiple equipment operating states and multiple measurement data to build a conventional power plant control area model.

[0110] In the embodiment of the present application, the AVC master station system obtains multiple equipment operating states and multiple measurement data in the power system, and uses the multiple equipment operating states and multiple measurement data to construct a conventional power plant control area model, and the calculation formula is the following formula 1:

[0111]

[0112] Among them, Z 500 It is a conventional power plant control area model. The embodiment of this application is a 500KV conventional power plant control area model. is the central bus in the control area of ​​a conventional power plant, and in the embodiment of the present application, it is a 500 kV central bus, and C is the total number of central buses. is a control generator in the control area of ​​a conventional power plant. In the embodiment of the present application, it is a control generator of a 500kV conventional power plant. N is the total number of conventional power plants. It is the high-voltage side control bus in the control area of ​​a conventional power plant. In the embodiment of the present application, it is a 500kV control bus on the high-voltage side, and K is the total number of high-voltage side control buses.

[0113] 202. Based on the conventional power plant control area model, the optimal power flow calculation of the power system is performed to obtain the voltage optimization target value of the target central bus.

[0114] In the embodiment of the present application, the AVC master station system performs optimal power flow calculation on the power system based on the conventional power plant control area model to obtain the voltage optimization target value of the target central bus. Among them, the objective function of the optimal power flow calculation is the following formula 2:

[0115] Formula 2: minf=P Loss =∑ (i,j)∈NL (P ij +P ji )

[0116] Among them, f is the objective function, P Loss is the active power loss of the power grid, (P ij +P ji ) is the network loss of node ij.

[0117] The objective function equation constraint of the optimal power flow calculation is as follows:

[0118] Formula 3:

[0119] The objective function inequality constraint of the optimal power flow calculation is as follows:

[0120] Formula 4:

[0121] Through the optimal power flow calculation, the AVC master station system can calculate the voltage optimization target values ​​of multiple central buses, and then obtain the voltage optimization target value of the i-th central bus, that is, the voltage optimization target value of the target central bus

[0122] 203. Based on the conventional power plant control area model, determine the reactive sensitivity of the target controlled generator to the target high-voltage side control bus, as well as the increaseable reactive value and the decreaseable reactive value of the target controlled generator.

[0123] In the embodiment of the present application, the AVC master station system obtains the target controlled generator in the conventional power plant control area model. Then, the AVC master station system determines the reactive voltage sensitivity of the target controlled generator to the target central bus based on the conventional power plant control area model, and uses the reactive voltage sensitivity to determine the reactive sensitivity of the target controlled generator to the target high-voltage side control bus.

[0124] It should be noted that in the embodiment of the present application, the Jacobian matrix is ​​constructed using the flow calculation results to solve the reactive and active sensitivity. For example, the active sensitivity matrix Sp and reactive sensitivity matrix Sq of the 500kV logic bus in the control area of ​​the conventional power plant are calculated for each 500kV conventional power plant unit in the control area of ​​the conventional power plant, and the calculation formula is the following formula 5:

[0125] Formula 5:

[0126] Where n is the number of units in the control area of ​​the conventional power plant, m is the number of 500kV logical buses in the control area of ​​the conventional power plant, and for the active sensitivity matrix Sp: S ij =ΔP Ti / ΔP bj , S ij is the active sensitivity of the conventional power plant unit j injected into the logical bus i, ΔP Ti The change in active power injected by the unit, ΔP bj is the change in active power at the logical bus i; for the reactive power sensitivity matrix Sq: S ij =ΔQ Ti / ΔQ bj , S ij is the reactive sensitivity of the conventional power plant unit j to the logical bus i, ΔQ Ti The reactive power change injected by the unit, ΔQ bj is the change in reactive power at the logic bus i. Optionally, the reactive voltage sensitivity of the central bus can be calculated by a power flow injection method or can be manually set to control the reactive power regulation capability of the generator motor, and this application does not impose any specific restrictions.

[0127] Then, the AVC master station system obtains the unit regulation capability value of the target controlled generator based on the conventional power plant control area model. The unit regulation capability value includes the increaseable reactive power value and the decreaseable reactive power value, and then calculates the maximum increase and decrease.

[0128] 204. The reactive power sensitivity and the increaseable reactive power value and the decreaseable reactive power value of the target controlled generator are used to calculate and determine the maximum increase and decrease.

[0129] In the embodiment of the present application, the AVC master station system uses the increaseable reactive power value and reactive power sensitivity of the target controlled generator to calculate and determine the maximum increase amount, and the calculation formula is the following formula 6:

[0130] Formula 6:

[0131] in, is the maximum upward adjustment of the target high-voltage side control bus k, The target is to control the increaseable reactive power value of the generator g, is the reactive sensitivity of the target controlled generator g to the target high voltage side control bus k.

[0132] Next, the AVC master station system uses the deductible reactive power value and reactive power sensitivity of the target controlled generator to calculate and determine the maximum reduction amount, and the calculation formula is the following formula 7:

[0133] Formula 7:

[0134] in, is the maximum downward adjustment of the target high-voltage side control bus k, is the target control of the reducible reactive power value of the generator g, is the reactive sensitivity of the target controlled generator g to the target high voltage side control bus k.

[0135] 205. Perform secondary planning on the maximum upward regulation, the maximum downward regulation and the voltage optimization target value of the target central bus to obtain the voltage control target value of the target high-voltage side control bus.

[0136] In the embodiment of the present application, the AVC master station system obtains the objective function, and the objective function is the following formula 8:

[0137] Formula 8:

[0138] Among them, ΔQ g is the reactive power output regulation of the target controlled generator g, V P is the current voltage of the target central bus, is the set voltage of the target central bus, C g is the reactive voltage sensitivity of the target control generator g to the target central bus, W p is the first weight coefficient, W q is the second weight coefficient, α is the gain coefficient, Θ g is the reactive power margin vector, is the i-th component of the reactive margin vector, is the reactive power output regulation of the ith component, is the current reactive power of the ith component, is the reactive power lower limit of the ith component, is the reactive upper limit of the i-th component. In order to increase the reactive margin of the generator and make its output more balanced, the embodiment of the present application defines the reactive margin θ g , by putting ‖Θ g ‖ 2 Introducing it into the secondary programming objective function can ensure the increase of reactive power margin of the controlled generator on the one hand, and on the other hand, it can promote each controlled generator to develop in the direction of more balanced reactive power output. It should be noted that due to different user requirements such as the upper / lower limit of required voltage, the upper / lower limit of unit reactive power, etc., the objective function of the secondary programming will also change, and this application does not impose specific restrictions.

[0139] Next, the AVC master station system obtains the constraint function, and the calculation formula is the following formula 9:

[0140] Formula 9:

[0141] Among them, ΔQ g is the reactive power output regulation of the target controlled generator g, C g is the reactive voltage sensitivity of the target control generator g to the target central bus, C vg is the reactive voltage sensitivity of the target controlled generator g to the target high-voltage side control bus, V P is the current voltage of the target central bus, is the voltage lower limit of the target central bus, is the voltage upper limit of the target central bus, V H is the current voltage of the target high-voltage side control bus, is the voltage lower limit of the target high-voltage side control bus, is the voltage upper limit of the target high-voltage side control bus, is the maximum single-step adjustment of the target high-voltage side control busbar, Q g To control the current reactive power of generator g, is the reactive power lower limit of the target control generator g, is the reactive upper limit of the target control generator g. It should be noted that in the actual reactive voltage optimization control system, the final control is performed by the AVC substation system, while the control strategy of the AVC master station system is to give V HTherefore, in order to prevent the control operation from causing excessive fluctuations in the power grid, there are strict restrictions on the control step size in each step of control. This is achieved through the first constraint in formula 9, which means that the adjustment amount after control must be less than the maximum adjustment amount allowed for a single step. The second and third constraints in formula 9 can ensure that the control will not cause and produce over-limits. For some other important bus voltages, similar constraints can be added to the constraints. The fourth constraint in formula 9 can ensure that the reactive output of the generator will not exceed the limit after control.

[0142] Then, the AVC master station system uses the objective function and constraint function to calculate the maximum upward adjustment, the maximum downward adjustment and the voltage optimization target value of the target central bus to obtain the voltage control target value of the target high-voltage side control bus. Optionally, the active set method can be used to solve this quadratic programming problem to obtain the reactive power output adjustment ΔQ of the target control generator g. g Then the sensitivity matrix is ​​used to convert it into the adjustment value ΔV of the high-voltage bus voltage setting value of the conventional power plant H .

[0143] 206. Obtain the high voltage bus voltage value.

[0144] In the embodiment of the present application, the AVC master station system obtains the high-voltage side control bus number sent by the AVC substation, and determines the designated high-voltage side control bus in the conventional power plant control area model according to the high-voltage side control bus number. Then, the AVC master station system collects the voltage measurement value of the designated high-voltage side control bus to obtain the high-voltage bus voltage value. For example, the 500kV control bus on the high-voltage side of the conventional power plant generator control station is obtained. The number m, where m∈{1,2,3,...k}, is the number of the control bus. Select bus B with the corresponding number m Then the data is collected from the substation and sent to the conventional power plant to control the 500kV control bus B on the high voltage side of the generator. m The voltage measurement value is used to obtain the high-voltage bus voltage value.

[0145] 207. Obtain an incremental coding control rule, and generate an incremental coding control instruction according to the incremental coding control rule by using a voltage control target value of a target high-voltage side control bus.

[0146] In an embodiment of the present application, in order to solve the problem of inconsistent control targets between the AVC master station and the AVC substation of a conventional power plant in automatic voltage control of a conventional power plant, the AVC master station system issues incremental coding control instructions and target coding control instructions to improve the accuracy of voltage regulation through dual instructions.

[0147] First, an incremental coding control instruction is generated. Specifically, the AVC master station system calculates the voltage control target value of the target high-voltage side control bus to obtain a control increment value, and the calculation formula is the following formula 10:

[0148] Formula 10:

[0149] in, is the control increment value of the target high-voltage side control bus k, ΔV k is the voltage control target value of the target high-voltage side control bus k.

[0150] Next, the AVC master station system determines the adjustment direction of the target high-voltage side control busbar, and the calculation formula is the following formula 11:

[0151] Formula 11:

[0152] Where, ΔV k is the voltage control target value of the target high-voltage side control bus k, V f The target high-voltage side controls the adjustment direction of bus k. Then, the AVC master station system generates an incremental coding control instruction using the control increment value and the adjustment direction according to the incremental coding control rule.

[0153] In the incremental coding control rule, the conventional power plant control instruction code is generated according to the incremental value and adjustment direction of the adjustment. The code is a 3-digit integer, and the value of each digit is defined as follows:

[0154] The hundreds digit indicates the voltage regulation direction of the control busbar on the high voltage side of a conventional power plant. "2" indicates an increase, "1" indicates a decrease, and other data indicate communication errors.

[0155] The tens digit value represents a control instruction issuance round, and the value increases from "1" to "5" in a cyclical manner. When the AVC master station system issues control instructions in each round, it ensures that the value of this digit is different from the control instruction of the previous round. The AVC substation system saves the control instruction code of the previous round, and after obtaining the control instruction code of the new round, if it is found that the tens digit value of the new control instruction code is the same as the tens digit value of the previous round, or the tens digit value is not in an increasing cycle, or the tens digit value is not in the range of "1" to "5", then the control instruction is illegal;

[0156] The unit digit value represents the voltage regulation increment of the high-voltage side control bus, and is represented by 0, 1, 2, ..., 7 or 8. 8 represents the maximum value of the voltage regulation increment, and 0 indicates that the voltage does not need to be regulated at present.

[0157] 208. Obtain a control target coding rule, and generate a target coding control instruction according to the control target coding rule by using the high-voltage bus voltage value and the voltage control target value of the target high-voltage side control bus.

[0158] After obtaining the incremental coding control instruction, the target coding control instruction is further generated. In the embodiment of the present application, the AVC master station system calculates the voltage value of the high-voltage bus and the voltage control target value of the target high-voltage side control bus to obtain the control target value, and the calculation formula is the following formula 12:

[0159] Formula 12:

[0160] in, is the control target value of the target high-voltage side control bus k, ΔV k is the voltage control target value of the target high-voltage side control bus k, is the voltage value of the high voltage bus. Then, the AVC master station system generates a target coding control instruction using the control target value according to the control target coding rule.

[0161] In the control target coding rule, the conventional power plant control instruction code is generated according to the adjustment target value. The code is a 5-digit integer, and the value of each digit is defined as follows:

[0162] The ten-thousandth digit value represents a control instruction issuance round, and the value increases from "1" to "3" in a cyclical increment. The AVC master station system ensures that the value of this digit is different from the control instruction of the previous round when issuing control instructions in each round. The AVC substation system saves the control instruction code of the previous round. After obtaining the control instruction code of the new round, if the ten-thousandth digit value of the new control instruction code is the same as the value of the previous round, or the ten-thousandth digit value is not an increasing cycle, or the ten-thousandth digit value is not in the range of "1" to "3", then the control instruction is illegal;

[0163] The thousands, hundreds, tens and units digits represent the integer value obtained by multiplying the control target value of the target high-voltage side control bus by 10.

[0164] 209. Send the incremental encoding control instruction and the target encoding control instruction to the AVC substation.

[0165] In an embodiment of the present application, after the AVC master station system obtains the incremental coding control instruction and the target coding control instruction, it simultaneously sends the incremental coding control instruction and the target coding control instruction to the AVC substation, so that the AVC substation performs voltage control on the target high-voltage side control bus according to the incremental coding control instruction and the target coding control instruction, thereby improving the accuracy of voltage control.

[0166] 210. The AVC substation performs voltage control on the target high-voltage side control bus according to the incremental coding control instruction and the target coding control instruction.

[0167] In an embodiment of the present application, the AVC substation parses the incremental coding control instructions and the target coding control instructions issued by the AVC master station system according to the decoding rules, and generates conventional power plant AVC substation execution instructions.

[0168] Specifically, the AVC master station system obtains the incremental coding rules based on the AVC substation, uses the incremental coding rules to decode and parse the incremental coding control instructions, and obtains the bus voltage control incremental value

[0169] Next, the control target rule is obtained based on the AVC substation, and the target coded control instruction is decoded and parsed using the control target rule to obtain the bus voltage control target value.

[0170] Then, the current voltage measurement value of the target high-voltage side control bus is collected based on the AVC substation. The sum of the current voltage measurement value and the bus voltage control increment value is compared with the bus voltage control target value, as shown in the following formula 13:

[0171] Formula 13:

[0172] in, is the bus voltage control target value, is the bus voltage control increment value, The current voltage measurement value of the target high-voltage side control bus. If the sum of the current voltage measurement value and the bus voltage control increment value is greater than the bus voltage control target value based on the AVC substation, the bus voltage control increment value is used to generate an execution instruction; if the sum of the current voltage measurement value and the bus voltage control increment value is less than the bus voltage control target value based on the AVC substation, the bus voltage control target value is used to generate an execution instruction. Finally, the AVC substation system executes the execution instruction to realize automatic voltage control and improve the operational stability of the power system.

[0173] The method provided in the embodiment of the present application obtains a conventional power plant control area model, performs optimal power flow calculation on the power system based on the conventional power plant control area model, obtains the voltage optimization target value of the target central bus, performs secondary planning using the reactive sensitivity and unit regulation capability values ​​obtained based on the conventional power plant control area model and the voltage optimization target value of the target central bus, obtains the voltage control target value of the target high-voltage side control bus, obtains the high-voltage bus voltage value, uses the voltage control target value of the target high-voltage side control bus to generate incremental coded control instructions, uses the high-voltage bus voltage value and the voltage control target value of the target high-voltage side control bus to generate target coded control instructions, and sends the incremental coded control instructions and the target coded control instructions to the AVC substation so that the AVC substation performs voltage control on the target high-voltage side control bus according to the incremental coded control instructions and the target coded control instructions. This application obtains the optimized target value of the central bus voltage in the control area of ​​a conventional power plant based on the optimal power flow calculation, and then generates the voltage control target value of the high-voltage side control bus of the conventional power plant based on the sensitivity, unit regulation capability and the optimized target value of the central bus voltage, and selects the available high-voltage side control bus according to the number sent by the substation, collects the bus voltage value, and finally generates incremental coding control instructions and control target value instructions and sends them to the AVC substation of the conventional power plant. The AVC master station does not directly send the optimized target value of the high-voltage bus of the control generator. The incremental coding control instructions and target coding control instructions can avoid inconsistent voltage regulation directions and voltage overregulation, thereby improving the safety of reactive voltage control and improving the operational stability of the power system.

[0174] Further, as Figure 1 The specific implementation of the method, the embodiment of the present application provides a conventional power plant voltage control device based on dual instructions, such as Figure 3A As shown, the device includes: a first calculation module 301, a second calculation module 302, a generation module 303 and a sending module 304.

[0175] The first calculation module 301 is used to obtain a conventional power plant control area model, and based on the conventional power plant control area model, perform optimal power flow calculation on the power system to obtain a voltage optimization target value of a target central bus;

[0176] The second calculation module 302 is used to perform secondary planning using the reactive sensitivity and unit regulation capability values ​​obtained based on the conventional power plant control area model and the voltage optimization target value of the target central bus to obtain the voltage control target value of the target high-voltage side control bus;

[0177] A generating module 303 is used to obtain a high-voltage bus voltage value, generate an incremental coding control instruction using the voltage control target value of the target high-voltage side control bus, and generate a target coding control instruction using the high-voltage bus voltage value and the voltage control target value of the target high-voltage side control bus;

[0178] The sending module 304 is used to send the incremental coding control instruction and the target coding control instruction to the AVC substation, so that the AVC substation controls the voltage of the target high-voltage side control bus according to the incremental coding control instruction and the target coding control instruction.

[0179] In a specific application scenario, the first calculation module 301 is used to obtain multiple equipment operating states and multiple measurement data in the power system, and use the multiple equipment operating states and multiple measurement data to build the conventional power plant control area model, wherein:

[0180]

[0181] Among them, Z 500 is the conventional power plant control area model, is the central bus in the control area of ​​a conventional power plant, C is the total number of central buses, is the controlled generator in the control area of ​​the conventional power plant, N is the total number of conventional power plants, is the high-voltage side control bus in the control area of ​​the conventional power plant, and K is the total number of high-voltage side control buses.

[0182] In a specific application scenario, the second calculation module 302 is used to obtain the target controlled generator in the conventional power plant control area model; determine the reactive voltage sensitivity of the target controlled generator to the target central bus based on the conventional power plant control area model, and use the reactive voltage sensitivity to determine the reactive sensitivity of the target controlled generator to the target high-voltage side control bus; obtain the unit adjustment capability value of the target controlled generator based on the conventional power plant control area model, and the unit adjustment capability value includes an increaseable reactive value and a decreaseable reactive value; use the increaseable reactive value of the target controlled generator and the reactive sensitivity to calculate and determine the maximum increase amount, wherein,

[0183]

[0184] in, is the maximum upward adjustment of the target high-voltage side control bus k, The reactive power value that can be increased by controlling the generator g for the target, is the reactive sensitivity of the target controlled generator g to the target high-voltage side controlled bus k; the maximum down-regulation amount is determined by calculating the deductible reactive value of the target controlled generator and the reactive sensitivity, wherein:

[0185]

[0186] in, is the maximum downward adjustment of the target high-voltage side control bus k, The deductible reactive power value of the generator g is controlled for the target, The reactive sensitivity of the target controlled generator g to the target high-voltage side control bus k is obtained; the maximum upward adjustment amount, the maximum downward adjustment amount and the voltage optimization target value of the target central bus are secondary planned to obtain the voltage control target value of the target high-voltage side control bus.

[0187] In a specific application scenario, the second calculation module 302 is used to obtain an objective function, where:

[0188]

[0189] Among them, ΔQ g is the reactive power output adjustment amount of the target control generator g, V P is the current voltage of the target central bus, is the set voltage of the target central bus, C g is the reactive voltage sensitivity of the target control generator g to the target central bus, W p is the first weight coefficient, W q is the second weight coefficient, α is the gain coefficient, Θ g is the reactive power margin vector, is the i-th component of the reactive margin vector, is the reactive power output regulation of the ith component, is the current reactive power of the ith component, is the reactive power lower limit of the ith component, is the reactive upper limit of the i-th component; obtain the constraint function, where,

[0190]

[0191] Among them, ΔQ g The reactive power output adjustment amount of the target control generator g, C g is the reactive voltage sensitivity of the target control generator g to the target central bus, C vg is the reactive voltage sensitivity of the target controlled generator g to the target high-voltage side control bus, V Pis the current voltage of the target central bus, is the voltage lower limit of the target central bus, is the voltage upper limit of the target central bus, V H is the current voltage of the target high-voltage side control bus, is the voltage lower limit of the target high-voltage side control bus, is the voltage upper limit of the target high-voltage side control bus, is the single-step maximum adjustment of the target high-voltage side control bus, Q g Control the current reactive power of the generator g for the target, The reactive power lower limit of the generator g is controlled for the target, is the reactive power upper limit of the target controlled generator g; the objective function and the constraint function are used to calculate the maximum upward adjustment, the maximum downward adjustment and the voltage optimization target value of the target central bus to obtain the voltage control target value of the target high-voltage side control bus.

[0192] In a specific application scenario, the generation module 303 is used to obtain the high-voltage side control bus number sent by the AVC substation, determine the designated high-voltage side control bus in the conventional power plant control area model according to the high-voltage side control bus number; collect the voltage measurement value of the designated high-voltage side control bus to obtain the high-voltage bus voltage value.

[0193] In a specific application scenario, the generating module 303 is used to calculate the voltage control target value of the target high-voltage side control bus to obtain a control increment value, wherein:

[0194]

[0195] in, is the control increment value of the target high-voltage side control bus k, ΔV k is the voltage control target value of the target high-voltage side control bus k; determines the adjustment direction of the target high-voltage side control bus, wherein,

[0196]

[0197] Where, ΔV k is the voltage control target value of the target high-voltage side control bus k, V f is the adjustment direction of the target high-voltage side control bus k; obtains the incremental coding control rule, and generates the incremental coding control instruction according to the incremental coding control rule by using the control increment value and the adjustment direction; calculates the voltage value of the high-voltage bus and the voltage control target value of the target high-voltage side control bus to obtain the control target value, wherein,

[0198]

[0199] in, is the control target value of the target high-voltage side control bus k, ΔV k is the voltage control target value of the target high-voltage side control bus k, is the voltage value of the high-voltage bus; obtaining a control target coding rule, and according to the control target coding rule, using the control target value to generate the target coding control instruction.

[0200] In specific application scenarios, such as Figure 3B As shown, the device also includes: an execution module 305.

[0201] The execution module 305 is used to obtain the incremental coding rule based on the AVC substation, and use the incremental coding rule to decode and parse the incremental coding control instruction to obtain the bus voltage control incremental value; obtain the control target rule based on the AVC substation, and use the control target rule to decode and parse the target coding control instruction to obtain the bus voltage control target value; based on the AVC substation, collect the current voltage measurement value of the target high-voltage side control bus, and compare the sum of the current voltage measurement value and the bus voltage control incremental value with the bus voltage control target value; if it is determined based on the AVC substation that the sum of the current voltage measurement value and the bus voltage control incremental value is greater than the bus voltage control target value, the bus voltage control incremental value is used to generate an execution instruction; if it is determined based on the AVC substation that the sum of the current voltage measurement value and the bus voltage control incremental value is less than the bus voltage control target value, the bus voltage control target value is used to generate an execution instruction.

[0202] The device provided in the embodiment of the present application obtains a conventional power plant control area model, performs optimal power flow calculation on the power system based on the conventional power plant control area model, obtains the voltage optimization target value of the target central bus, performs secondary planning using the reactive sensitivity and unit regulation capability values ​​obtained based on the conventional power plant control area model and the voltage optimization target value of the target central bus, obtains the voltage control target value of the target high-voltage side control bus, obtains the high-voltage bus voltage value, uses the voltage control target value of the target high-voltage side control bus to generate incremental coded control instructions, uses the high-voltage bus voltage value and the voltage control target value of the target high-voltage side control bus to generate target coded control instructions, and sends the incremental coded control instructions and the target coded control instructions to the AVC substation so that the AVC substation performs voltage control on the target high-voltage side control bus according to the incremental coded control instructions and the target coded control instructions. This application obtains the optimized target value of the central bus voltage in the control area of ​​a conventional power plant based on the optimal power flow calculation, and then generates the voltage control target value of the high-voltage side control bus of the conventional power plant based on the sensitivity, unit regulation capability and the optimized target value of the central bus voltage, and selects the available high-voltage side control bus according to the number sent by the substation, collects the bus voltage value, and finally generates incremental coding control instructions and control target value instructions and sends them to the AVC substation of the conventional power plant. The AVC master station does not directly send the optimized target value of the high-voltage bus of the control generator. The incremental coding control instructions and target coding control instructions can avoid inconsistent voltage regulation directions and voltage overregulation, thereby improving the safety of reactive voltage control and improving the operational stability of the power system.

[0203] It should be noted that for other corresponding descriptions of the functional units involved in the conventional power plant voltage control device based on dual instructions provided in the embodiment of the present application, reference can be made to Figure 1 and Figure 2 The corresponding description in will not be repeated here.

[0204] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties.

[0205] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0206] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

[0207] In an exemplary embodiment, see Figure 4 , and also provides a device, which includes a bus, a processor, a memory and a communication interface, and may also include an input and output interface and a display device, wherein each functional unit can communicate with each other through the bus. The memory stores a computer program, and the processor is used to execute the program stored in the memory and execute the conventional power plant voltage control method based on dual instructions in the above embodiment.

[0208] A medium stores a computer program, which, when executed by a processor, implements the steps of the conventional power plant voltage control method based on dual instructions.

[0209] Through the description of the above implementation methods, those skilled in the art can clearly understand that the present application can be implemented by hardware, or by means of software plus a necessary general hardware platform. Based on such an understanding, the technical solution of the present application can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (which can be a CD-ROM, a USB flash drive, a mobile hard disk, etc.), including a number of instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each implementation scenario of the present application.

[0210] Those skilled in the art will appreciate that the accompanying drawings are merely schematic diagrams of a preferred implementation scenario, and the modules or processes in the accompanying drawings are not necessarily required for implementing the present application.

[0211] Those skilled in the art will appreciate that the modules in the device in the implementation scenario can be distributed in the device in the implementation scenario according to the implementation scenario description, or can be changed accordingly and located in one or more devices different from the implementation scenario. The modules in the above implementation scenario can be combined into one module, or can be further split into multiple sub-modules.

[0212] The above application serial numbers are for description only and do not represent the advantages or disadvantages of the implementation scenarios.

[0213] The above disclosure only discloses several specific implementation scenarios of the present application. However, the present application is not limited thereto, and any changes that can be conceived by technicians in this field should fall within the scope of protection of the present application.

Claims

1. A conventional power plant voltage control method based on dual instructions, characterized in that: include: Obtaining a conventional power plant control area model, and based on the conventional power plant control area model, performing an optimal power flow calculation on the power system to obtain a voltage optimization target value of a target central bus; The reactive power sensitivity and unit regulation capability values ​​obtained based on the conventional power plant control area model and the voltage optimization target value of the target central bus are used for secondary planning to obtain the voltage control target value of the target high-voltage side control bus; Acquire the voltage value of the high-voltage bus, use the voltage control target value of the target high-voltage side control bus to generate an incremental coding control instruction, and use the voltage value of the high-voltage bus and the voltage control target value of the target high-voltage side control bus to generate a target coding control instruction; The incremental coding control instruction and the target coding control instruction are issued to the AVC substation, so that the AVC substation performs voltage control on the target high-voltage side control bus according to the incremental coding control instruction and the target coding control instruction.

2. The method according to claim 1, characterized in that The obtaining of the conventional power plant control area model comprises: In the power system, a plurality of equipment operating states and a plurality of measurement data are obtained, and the conventional power plant control area model is constructed using the plurality of equipment operating states and the plurality of measurement data, wherein: Among them, Z 500 is the conventional power plant control area model, is the central bus in the control area of ​​a conventional power plant, C is the total number of central buses, is the controlled generator in the control area of ​​the conventional power plant, N is the total number of conventional power plants, is the high-voltage side control bus in the control area of ​​the conventional power plant, and K is the total number of high-voltage side control buses.

3. The method according to claim 1, characterized in that The method of performing secondary planning by using reactive power sensitivity and unit regulation capability values ​​obtained based on the conventional power plant control area model and the voltage optimization target value of the target central bus to obtain the voltage control target value of the target high-voltage side control bus includes: Obtaining a target controlled generator in the conventional power plant control area model; Determine the reactive voltage sensitivity of the target controlled generator to the target central bus based on the conventional power plant control area model, and determine the reactive sensitivity of the target controlled generator to the target high-voltage side control bus using the reactive voltage sensitivity; Acquire the unit regulation capability value of the target controlled generator based on the conventional power plant control area model, wherein the unit regulation capability value includes an increaseable reactive power value and a decreaseable reactive power value; The maximum increase amount is determined by using the increaseable reactive power value of the target controlled generator and the reactive power sensitivity, wherein: in, is the maximum upward adjustment of the target high-voltage side control bus k, The reactive power value that can be increased by controlling the generator g for the target, The reactive sensitivity of the target controlled generator g to the target high-voltage side controlled bus k; The maximum reduction amount is determined by using the deductible reactive value of the target controlled generator and the reactive sensitivity, wherein: in, is the maximum downward adjustment of the target high-voltage side control bus k, The deductible reactive power value of the generator g is controlled for the target, The reactive sensitivity of the target controlled generator g to the target high-voltage side controlled bus k; Secondary programming is performed on the maximum upward regulation amount, the maximum downward regulation amount and the voltage optimization target value of the target central bus to obtain the voltage control target value of the target high-voltage side control bus.

4. The method according to claim 3, characterized in that The performing secondary programming on the maximum upward adjustment amount, the maximum downward adjustment amount and the voltage optimization target value of the target central bus to obtain the voltage control target value of the target high-voltage side control bus includes: Get the objective function, where Among them, ΔQ g is the reactive power output adjustment amount of the target control generator g, V P is the current voltage of the target central bus, is the set voltage of the target central bus, C g is the reactive voltage sensitivity of the target control generator g to the target central bus, W p is the first weight coefficient, W q is the second weight coefficient, α is the gain coefficient, Θ g is the reactive power margin vector, is the i-th component of the reactive margin vector, is the reactive power output regulation of the ith component, is the current reactive power of the ith component, is the reactive power lower limit of the ith component, is the reactive upper limit of the i-th component; Get the constraint function, where Among them, ΔQ g The reactive power output adjustment amount of the target control generator g, C g is the reactive voltage sensitivity of the target control generator g to the target central bus, C vg is the reactive voltage sensitivity of the target controlled generator g to the target high-voltage side control bus, V P is the current voltage of the target central bus, is the voltage lower limit of the target central bus, is the voltage upper limit of the target central bus, V H is the current voltage of the target high-voltage side control bus, is the voltage lower limit of the target high-voltage side control bus, is the voltage upper limit of the target high-voltage side control bus, is the single-step maximum adjustment of the target high-voltage side control bus, Q g Control the current reactive power of the generator g for the target, The reactive power lower limit of the generator g is controlled for the target, Controlling the reactive power upper limit of the generator g for the target; The objective function and the constraint function are used to calculate the maximum upward adjustment amount, the maximum downward adjustment amount and the voltage optimization target value of the target central bus to obtain the voltage control target value of the target high-voltage side control bus.

5. The method according to claim 1, characterized in that The step of obtaining the high-voltage bus voltage value includes: Obtain the high-voltage side control bus number sent by the AVC substation, and determine the designated high-voltage side control bus in the conventional power plant control area model according to the high-voltage side control bus number; The voltage measurement value of the designated high-voltage side control bus is collected to obtain the voltage value of the high-voltage bus.

6. The method according to claim 1, characterized in that The step of using the voltage control target value of the target high-voltage side control busbar to generate an incremental coded control instruction, and using the high-voltage busbar voltage value and the voltage control target value of the target high-voltage side control busbar to generate a target coded control instruction, comprises: The voltage control target value of the target high-voltage side control bus is calculated to obtain a control increment value, wherein: in, is the control increment value of the target high-voltage side control bus k, ΔV k is the voltage control target value of the target high-voltage side control bus k; Determine the adjustment direction of the target high-voltage side control bus, wherein: Where, ΔV k is the voltage control target value of the target high-voltage side control bus k, V f Controlling the adjustment direction of the target high-voltage side bus k; Acquire an incremental coding control rule, and generate the incremental coding control instruction according to the incremental coding control rule by using the control incremental value and the adjustment direction; The high-voltage bus voltage value and the target voltage control value of the target high-voltage side control bus are calculated to obtain a control target value, wherein: in, is the control target value of the target high-voltage side control bus k, ΔV k is the voltage control target value of the target high-voltage side control bus k, is the voltage value of the high voltage bus; A control target coding rule is obtained, and according to the control target coding rule, the control target value is used to generate the target coding control instruction.

7. The method according to claim 1, characterized in that After sending the incremental encoding control instruction and the target encoding control instruction to the AVC substation, the method further includes: Acquire an incremental coding rule based on the AVC substation, and decode and parse the incremental coding control instruction using the incremental coding rule to obtain a bus voltage control incremental value; Acquire a control target rule based on the AVC substation, and decode and parse the target coded control instruction using the control target rule to obtain a bus voltage control target value; Based on the AVC substation, the current voltage measurement value of the target high-voltage side control bus is collected, and the sum of the current voltage measurement value and the bus voltage control increment value is compared with the bus voltage control target value; If it is determined based on the AVC substation that the sum of the current voltage measurement value and the bus voltage control increment value is greater than the bus voltage control target value, then the bus voltage control increment value is used to generate an execution instruction; If it is determined based on the AVC substation that the sum of the current voltage measurement value and the bus voltage control increment value is less than the bus voltage control target value, the bus voltage control target value is used to generate an execution instruction.

8. A conventional power plant voltage control device based on dual instructions, characterized in that: include: The first calculation module is used to obtain a conventional power plant control area model, and based on the conventional power plant control area model, perform optimal power flow calculation on the power system to obtain a voltage optimization target value of a target central bus; The second calculation module is used to perform secondary planning using reactive sensitivity and unit regulation capability values ​​obtained based on the conventional power plant control area model and the voltage optimization target value of the target central bus to obtain the voltage control target value of the target high-voltage side control bus; A generating module, used for acquiring a high-voltage bus voltage value, using the voltage control target value of the target high-voltage side control bus to generate an incremental coding control instruction, and using the high-voltage bus voltage value and the voltage control target value of the target high-voltage side control bus to generate a target coding control instruction; The sending module is used to send the incremental coding control instruction and the target coding control instruction to the AVC substation, so that the AVC substation controls the voltage of the target high-voltage side control bus according to the incremental coding control instruction and the target coding control instruction.

9. A device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 7 are implemented.

10. A medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 7 are implemented.

Images