CN114614462A - Reactive voltage control method and device - Google Patents

Reactive voltage control method and device Download PDF

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Publication number
CN114614462A
CN114614462A CN202011450485.6A CN202011450485A CN114614462A CN 114614462 A CN114614462 A CN 114614462A CN 202011450485 A CN202011450485 A CN 202011450485A CN 114614462 A CN114614462 A CN 114614462A
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new energy
energy station
capacity ratio
circuit capacity
proportional
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Inventor
肖迪
于连富
闫虹
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Beijing Goldwind Science and Creation Windpower Equipment Co Ltd
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Xinjiang Goldwind Science and Technology Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/04—Circuit arrangements for ac mains or ac distribution networks for connecting networks of the same frequency but supplied from different sources
    • H02J3/06—Controlling transfer of power between connected networks; Controlling sharing of load between connected networks
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
    • H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/381—Dispersed generators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/10—Power transmission or distribution systems management focussing at grid-level, e.g. load flow analysis, node profile computation, meshed network optimisation, active network management or spinning reserve management
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • H02J2300/22—The renewable source being solar energy
    • H02J2300/24—The renewable source being solar energy of photovoltaic origin
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • H02J2300/28—The renewable source being wind energy

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

Abstract

A reactive voltage control method and apparatus are provided. The reactive voltage control method comprises the following steps: determining a system operation short circuit capacity ratio of the new energy station based on load flow data of a control point of the new energy station, wherein the load flow data comprises at least one of voltage, active power and reactive power of the control point; determining a proportional coefficient and an integral coefficient of a proportional-integral algorithm based on whether the system operation short-circuit capacity ratio is in a preset range; the reactive voltage control is carried out by utilizing a proportional integral algorithm based on the determined proportional coefficient and integral coefficient, so that the requirement of a power grid on response time/speed is met when the short-circuit capacity ratio of the system is changed, the accurate response to the power grid can be realized when the power grid strength is changed, the operation stability of a power generation unit of each station is ensured, the safety and the stability of the power grid and a new energy station are ensured, and the reactive voltage control method plays an important role in the voltage stability of the power grid and the new energy station.

Description

Reactive voltage control method and device
Technical Field
The present disclosure relates to the field of electrical technology. More particularly, the present disclosure relates to a reactive voltage control method and apparatus.
Background
As the penetration rate of new energy into the power system continues to increase and paris agreements take effect, the proportion of traditional energy on a global scale will necessarily continue to decrease. The new energy such as wind power and photovoltaic cannot provide powerful voltage frequency support for the power grid due to the specific determination of the new energy, so that the short-circuit capacity of the power grid is continuously reduced, the power grid is continuously weakened, and unprecedented influence is brought to the control of a new energy station. New energy manufacturers and developers in the world, power grid operation departments and the like all face the technical problem of weak grid control.
The short-circuit capacity ratio (SCR) of system operation means that the short-circuit capacity of a representation system is divided by the capacity of equipment, so when the short-circuit ratio is large, the equipment is connected to a strong system, the switching of the equipment is not greatly influenced on the system, and the power system refers to the power grid as a strong power grid, otherwise, the power grid is called as a weak power grid. And the short circuit capacity is equal to the system admittance value in the value under the condition of unit voltage, namely the reciprocal of the system Thevenin equivalent impedance. The larger the short-circuit capacity is, the smaller the Thevenin equivalent resistance of the system is, and the large change of the voltage amplitude can not be caused by the switching of the load, the parallel capacitor or the reactor, so that the system is stronger, and the system is weaker on the contrary. The main new energy sources such as wind power and photovoltaic have obvious instability, and when the main new energy sources become the main energy sources, the system is not damped due to the fact that inertia like traditional thermal power/hydroelectric power does not exist, SCR of the system is reduced, SCR of the system changes at any time, and challenges are brought to control of a power grid.
Once the control parameters of the conventional reactive power control scheme are determined during system installation and debugging, the control parameters cannot be changed along with the operation mode of the system and are correspondingly adjusted. Therefore, when the operation mode of the system is changed, the previously determined control parameters cannot be matched with the control parameters, so that the operation of the system cannot meet the requirement of a power grid, and even a new energy power plant is disconnected, and the safe and stable operation of the system is influenced.
At present, in reactive voltage control of a new energy (wind power plant/photovoltaic power plant) electric field, the control core is assumed to be system SCR fixing. This control method of control has not caused significant control problems in the past because: (1) the requirement on reactive response speed in the control of the strong power grid is low; (2) the SCR of the new energy station grid-connected point is not changed greatly. However, these two conditions are currently and increasingly no longer applicable. When the system SCR changes (e.g., system maintenance, remote fault, wind/light change, etc.), the control parameters of the previous stable operation may cause the system to be unstable, causing oscillations or even a network outage. In view of the clear requirements of the global power grid on the reactive response speed of the new energy station in recent years and the unpredictability of the system SCR caused by the large-scale access of the new energy, a control method is needed to meet the requirements of the power grid on the response time/speed when the system SCR changes.
Disclosure of Invention
An exemplary embodiment of the present disclosure is to provide a reactive voltage control method and apparatus to meet the response time/speed requirement of the grid when the system SCR changes.
According to an exemplary embodiment of the present disclosure, there is provided a reactive voltage control method including: determining a system operation short circuit capacity ratio of the new energy station based on load flow data of a control point of the new energy station, wherein the load flow data comprises at least one of voltage, active power and reactive power of the control point; determining a proportional coefficient and an integral coefficient of a proportional-integral algorithm based on whether the system operation short-circuit capacity ratio is in a preset range; and performing reactive voltage control by using a proportional-integral algorithm based on the determined proportional coefficient and integral coefficient.
Optionally, the step of determining the system operation short-circuit capacity ratio of the new energy station based on the power flow data of the control point of the new energy station may include: calculating the load flow change data of the control points of the new energy station based on the load flow data of the control points of the new energy station; and determining the system operation short circuit capacity ratio of the new energy station according to the tide data and the tide change data of the control point of the new energy station, the rated voltage of the control point of the new energy station and the rated power of the new energy station.
Optionally, the step of determining the system operation short circuit capacity ratio of the new energy station according to the power flow data and the power flow change data of the control point of the new energy station, the rated voltage of the control point of the new energy station and the rated power of the new energy station may include: calculating system impedance of the control points of the new energy station according to the load flow data and the load flow change data of the control points of the new energy station; and determining the system operation short circuit capacity ratio of the new energy station based on the system impedance of the control point of the new energy station, the rated voltage of the control point of the new energy station and the rated power of the new energy station.
Optionally, the step of determining the scaling factor and the integration factor of the proportional-integral algorithm based on whether the system operating short circuit capacity ratio is in a predetermined range may comprise: when the system operation short-circuit capacity ratio is in a preset range, determining a proportional coefficient and an integral coefficient of a proportional-integral algorithm from a preset control parameter table according to the load flow data of a control point of a new energy station and the system operation short-circuit capacity ratio; and when the short-circuit capacity ratio of the system operation is not in the preset range, keeping the proportional coefficient and the integral coefficient of the current proportional-integral algorithm unchanged.
Alternatively, the predetermined range of the system operation short-circuit capacity ratio may be determined based on the system maximum operation short-circuit capacity ratio and the system minimum operation short-circuit capacity ratio of the new energy station, and the control parameter table may be generated based on a proportional coefficient and an integral coefficient of a proportional-integral algorithm under different predetermined tidal current conditions and system operation short-circuit capacity ratio combinations.
Alternatively, the lower limit value of the predetermined range of the system operation short-circuit capacity ratio may be equal to or greater than the system minimum operation short-circuit capacity ratio, and the upper limit value may be equal to or less than the system maximum operation short-circuit capacity ratio.
According to an exemplary embodiment of the present disclosure, there is provided a reactive voltage control apparatus including: a capacity ratio determination unit configured to determine a system operation short-circuit capacity ratio of the new energy station based on power flow data of a control point of the new energy station, wherein the power flow data includes at least one of voltage, active power and reactive power of the control point; a coefficient determination unit configured to determine a proportional coefficient and an integral coefficient of a proportional-integral algorithm based on whether the system operation short-circuit capacity ratio is in a predetermined range; and a reactive power control unit configured to perform reactive voltage control using a proportional-integral algorithm based on the determined proportional coefficient and integral coefficient.
Alternatively, the capacity ratio determination unit may be configured to: calculating the load flow change data of the control points of the new energy station based on the load flow data of the control points of the new energy station; and determining the system operation short circuit capacity ratio of the new energy station according to the tide data and the tide change data of the control point of the new energy station, the rated voltage of the control point of the new energy station and the rated power of the new energy station.
Alternatively, the capacity ratio determination unit may be configured to: calculating system impedance of the control points of the new energy station according to the load flow data and the load flow change data of the control points of the new energy station; and determining the system operation short circuit capacity ratio of the new energy station based on the system impedance of the control point of the new energy station, the rated voltage of the control point of the new energy station and the rated power of the new energy station.
Alternatively, the coefficient determination unit may be configured to: when the system operation short-circuit capacity ratio is in a preset range, determining a proportional coefficient and an integral coefficient of a proportional-integral algorithm from a preset control parameter table according to the load flow data of a control point of a new energy station and the system operation short-circuit capacity ratio; and when the short-circuit capacity ratio of the system operation is not in the preset range, keeping the proportional coefficient and the integral coefficient of the current proportional-integral algorithm unchanged.
Alternatively, the predetermined range of the system operation short-circuit capacity ratio may be determined based on the system maximum operation short-circuit capacity ratio and the system minimum operation short-circuit capacity ratio of the new energy station, and the control parameter table may be generated based on a proportional coefficient and an integral coefficient of a proportional-integral algorithm under different predetermined tidal current conditions and system operation short-circuit capacity ratio combinations.
Alternatively, the lower limit value of the predetermined range of the system operation short-circuit capacity ratio may be equal to or greater than the system minimum operation short-circuit capacity ratio, and the upper limit value may be equal to or less than the system maximum operation short-circuit capacity ratio.
According to an exemplary embodiment of the present disclosure, there is provided a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements a reactive voltage control method according to an exemplary embodiment of the present disclosure.
In accordance with an example embodiment of the present disclosure, there is provided a computing device comprising: at least one processor; at least one memory storing a computer program that, when executed by the at least one processor, implements a reactive voltage control method according to an exemplary embodiment of the present disclosure.
According to an exemplary embodiment of the present disclosure, a computer program product is provided, in which instructions are executable by a processor of a computer device to perform a reactive voltage control method according to an exemplary embodiment of the present disclosure.
According to the reactive voltage control method and device of the exemplary embodiment of the disclosure, the system operation short-circuit capacity ratio of the new energy station is determined based on the tidal current data of the control point of the new energy station, the proportional coefficient and the integral coefficient of the proportional-integral algorithm are determined based on whether the system operation short-circuit capacity ratio is in the preset range, and the reactive voltage control is performed by using the proportional-integral algorithm based on the determined proportional coefficient and integral coefficient, so that the requirement of the power grid on response time/speed is met when the system SCR changes, the accurate response of the power grid can be realized when the power grid strength changes, the operation stability of the power generation unit of each station is guaranteed, the safety and the stability of the power grid and the new energy station are guaranteed, and the method and device play an extremely important role in stabilizing the voltages of the power grid and the new energy station.
Additional aspects and/or advantages of the present general inventive concept will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the general inventive concept.
Drawings
The above and other objects and features of exemplary embodiments of the present disclosure will become more apparent from the following description taken in conjunction with the accompanying drawings which illustrate exemplary embodiments, wherein:
fig. 1 shows a flow chart of a reactive voltage control method according to an exemplary embodiment of the present disclosure;
fig. 2 shows a block diagram of a reactive voltage control device according to an exemplary embodiment of the present disclosure; and
fig. 3 shows a schematic diagram of a computing device according to an exemplary embodiment of the present disclosure.
Detailed Description
Reference will now be made in detail to the exemplary embodiments of the present disclosure, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the like elements throughout. The embodiments are described below in order to explain the present disclosure by referring to the figures.
Fig. 1 shows a flow chart of a reactive voltage control method according to an exemplary embodiment of the present disclosure. The reactive voltage control method according to the exemplary embodiment of the present disclosure may be applicable to various grid strengths.
Referring to fig. 1, in step S101, a system operation short-circuit capacity ratio of a new energy station is determined based on power flow data of a control point of the new energy station.
In an exemplary embodiment of the present disclosure, the power flow data may include voltage, active power, and reactive power of the control point.
In an exemplary embodiment of the present disclosure, when determining the system operation short circuit capacity ratio of the new energy station based on the power flow data of the control point of the new energy station, the power flow change data of the control point of the new energy station may be first calculated based on the power flow data of the control point of the new energy station, and then the system operation short circuit capacity ratio of the new energy station may be determined according to the power flow data of the control point of the new energy station, the power flow change data, the rated voltage of the control point of the new energy station, and the rated power of the new energy station.
In an exemplary embodiment of the present disclosure, when determining the system operation short circuit capacity ratio of the new energy station according to the tidal current data and the tidal current change data of the control point of the new energy station, the rated voltage of the control point of the new energy station, and the rated power of the new energy station, the system impedance of the control point of the new energy station may be first calculated according to the tidal current data and the tidal current change data of the control point of the new energy station, and then the system operation short circuit capacity ratio of the new energy station may be determined based on the system impedance of the control point of the new energy station, the rated voltage of the control point of the new energy station, and the rated power of the new energy station.
For example, the voltage U may first be determined from a current measurement of the control point of the new energy station1Active power P1And reactive power Q1And the voltage variation between the current measured voltage and the previous measured voltage, according to the formula DeltaU1＝(P1R+Q1X)/U1And delta U1＝(P1X-Q1R)/U1And calculating the system impedance of the control point of the new energy station. Here,. DELTA.U1Is the real part of the voltage change, δ U1Is the imaginary part of the voltage variation, R is the resistance and X is the reactance. After the system impedance is obtained, according to the formula
Figure BDA0002826614900000051
Figure BDA0002826614900000052
The system operation short circuit capacity ratio SCR is calculated in real time. Here, PwfIs the rated power (i.e., capacity), U, of the new energy stationnIs the nominal voltage of the control point.
Specifically, each new energy station has one point of connection and more than one control point, and the point of connection of the new energy station may be a control point or not. When the new energy station has a plurality of control points, the system operation short-circuit capacity ratio of the new energy station can be determined based on the power flow data of all the control points. When the new energy station has a plurality of control points, in view of the small capacity of the power generation unit (for example, but not limited to, a wind turbine) cluster under each control point relative to the whole system, all the power generation units under the control point can be controlled as one cluster/one independent new energy station; that is, when there are a plurality of control points, each control point may be regarded as one new energy site, so that the plurality of control points are controlled as a plurality of new energy sites, respectively, and the control method for the plurality of control points may be the same as the control method for the single control point.
In step S102, the proportional coefficient and the integral coefficient of the proportional-integral algorithm are determined based on whether the system operation short-circuit capacity ratio is in a predetermined range.
In an exemplary embodiment of the present disclosure, in determining a proportional coefficient and an integral coefficient of a proportional-integral algorithm based on whether a system operation short-circuit capacity ratio is in a predetermined range, the proportional coefficient and the integral coefficient of the proportional-integral algorithm may be determined from a predetermined control parameter table according to power flow data of a control point of a new energy station and the system operation short-circuit capacity ratio when the system operation short-circuit capacity ratio is in the predetermined range; when the short-circuit capacity ratio of the system operation is not in the preset range, the proportional coefficient and the integral coefficient of the current proportional-integral algorithm are kept unchanged.
In an exemplary embodiment of the present disclosure, the predetermined range of the system operating short circuit capacity ratio may be determined based on a system maximum operating short circuit capacity ratio and a system minimum operating short circuit capacity ratio of the new energy station. For example, making N-1 to N-4 faults may call up the maximum SCR and minimum SCR of the system using power system simulation computing software (e.g., without limitation, PSSE, PSCAD, DIgsilent, BPA, MATLAB, etc.).
In an exemplary embodiment of the present disclosure, a lower limit value of the predetermined range of the system operation short circuit capacity ratio may be equal to or greater than a system minimum operation short circuit capacity ratio, and an upper limit value may be equal to or less than a system maximum operation short circuit capacity ratio. For example, the calculated maximum SCR (SCR) of the system may be usedmax) And minimum SCR (SCR)min) As the predetermined range of the SCR, to judge the actual SCR by judging whether the SCR calculated in real time is in the predetermined range or not during operationIf the calculated SCR is valid. If the calculated SCR is less than the SCRmaxAnd is larger than SCRminIf not, the calculated SCR is invalid. In the event that the computed SCR is invalid, there may be errors in the input data/collected data, so the computed SCR is discarded and the control parameters from the previous lookup are maintained.
In the exemplary embodiment of the disclosure, the control parameter table may be generated based on the predetermined proportional coefficient and integral coefficient of the proportional-integral algorithm under different load flow conditions and system operation short-circuit capacity ratio combinations, so that the simulated control result is introduced and applied to an actual control strategy, thereby effectively solving the problem that the conventional control scheme cannot adapt to different power grid strengths.
As an example, Sac can be changed by changing all possible operation modes of the system through simulation, so that all different possible SCR can be obtained, and the optimal control parameters can be obtained through simulation operation by combining different wind power plant operation conditions through the different possible SCR. Here, the operation mode is a term of the electric power system, and refers to whether an important power transmission line/power plant in the system is cut off or repaired to exit the operation. The mode of operation in which all the devices are put into operation is referred to as maximum mode of operation.
For example, under different combinations of the load flow conditions (P, Q, V) and the SCR, the simulation is operated by modifying the control parameter table (such as, but not limited to, the proportional coefficient and the integral coefficient of a proportional-integral algorithm), the control parameter with the best reactive voltage control effect is recorded, and the control parameter table with the optimal reactive voltage control effect is generated. Can be according to the formula SCR ═ Sac/PwfTo determine various possible SCRs. Here, Sac is the short-circuit capacity of the system, PwfThe capacity of the new energy station. Sac can be changed when the operation mode of the system is changed and can be unchanged when the operation mode of the system is not changed. PwfA new energy site may be considered unchanged when it is unchanged.
In addition, in the exemplary embodiment of the disclosure, the current operating state of the power generation unit can be judged through the current data of the power generation unit by obtaining the current data of the power generation unit, so that the condition that the power generation unit is disconnected due to the adjusting process is prevented. For example, when the voltage of a power generation unit exceeds a given upper limit threshold, a capacitive reactive instruction is not issued to the power generation unit any more so as to prevent the voltage from continuously rising and being disconnected; similarly, when the voltage of the power generation unit is lower than the given lower threshold, the inductive reactive instruction is not sent to the power generation unit any more, so as to prevent the voltage from continuously decreasing and being disconnected. Meanwhile, the reactive power of the power generation units is monitored, the standby reactive power of the power generation units can be calculated in real time, and the control algorithm is optimized conveniently, so that the reactive output of each power generation unit is relatively balanced.
In step S103, reactive voltage control is performed using a proportional-integral algorithm based on the determined proportional coefficient and integral coefficient.
Further, according to an exemplary embodiment of the present disclosure, there is also provided a computer-readable storage medium having stored thereon a computer program which, when executed, implements a reactive voltage control method according to an exemplary embodiment of the present disclosure.
In an exemplary embodiment of the disclosure, the computer readable storage medium may carry one or more programs which, when executed, implement the steps of: determining a system operation short circuit capacity ratio of the new energy station based on load flow data of a control point of the new energy station, wherein the load flow data comprises at least one of voltage, active power and reactive power of the control point; determining a proportional coefficient and an integral coefficient of a proportional-integral algorithm based on whether the system operation short-circuit capacity ratio is in a preset range; and performing reactive voltage control by using a proportional integral algorithm based on the determined proportional coefficient and integral coefficient.
A computer readable storage medium may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the foregoing. More specific examples of the computer readable storage medium may include, but are not limited to: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In embodiments of the present disclosure, a computer readable storage medium may be any tangible medium that can contain, or store a computer program for use by or in connection with an instruction execution system, apparatus, or device. The computer program embodied on the computer readable storage medium may be transmitted using any appropriate medium, including but not limited to: electrical wires, optical cables, RF (radio frequency), etc., or any suitable combination of the foregoing. The computer readable storage medium may be embodied in any device; it may also be present separately and not assembled into the device.
Furthermore, according to an exemplary embodiment of the present disclosure, a computer program product is also provided, in which instructions are executable by a processor of a computer device to perform a method of reactive voltage control according to an exemplary embodiment of the present disclosure.
The reactive voltage control method according to an exemplary embodiment of the present disclosure has been described above in connection with fig. 1. Hereinafter, a reactive voltage control device and units thereof according to an exemplary embodiment of the present disclosure will be described with reference to fig. 2.
Fig. 2 shows a block diagram of a reactive voltage control device according to an exemplary embodiment of the present disclosure.
Referring to fig. 2, the reactive voltage control apparatus includes a capacity ratio determination unit 21, a coefficient determination unit 22, and a reactive control unit 23.
The capacity ratio determination unit 21 is configured to determine a system operation short-circuit capacity ratio of the new energy station based on the power flow data of the control point of the new energy station.
In an exemplary embodiment of the present disclosure, the power flow data may include at least one of voltage, active power, and reactive power of the control point.
In an exemplary embodiment of the present disclosure, the capacity ratio determination unit 21 may be configured to: calculating the load flow change data of the control points of the new energy station based on the load flow data of the control points of the new energy station; and determining the system operation short circuit capacity ratio of the new energy station according to the tide data and the tide change data of the control point of the new energy station, the rated voltage of the control point of the new energy station and the rated power of the new energy station.
In an exemplary embodiment of the present disclosure, the capacity ratio determination unit 21 may be configured to: calculating system impedance of the control points of the new energy station according to the load flow data and the load flow change data of the control points of the new energy station; and determining the system operation short circuit capacity ratio of the new energy station based on the system impedance of the control point of the new energy station, the rated voltage of the control point of the new energy station and the rated power of the new energy station.
The coefficient determination unit 22 is configured to determine a proportional coefficient and an integral coefficient of a proportional-integral algorithm based on whether the system operation short-circuit capacity ratio is in a predetermined range.
In an exemplary embodiment of the present disclosure, the coefficient determination unit 22 may be configured to: when the system operation short-circuit capacity ratio is in a preset range, determining a proportional coefficient and an integral coefficient of a proportional-integral algorithm from a preset control parameter table according to the load flow data of the control point of the new energy station and the system operation short-circuit capacity ratio; and when the short-circuit capacity ratio of the system operation is not in the preset range, keeping the proportional coefficient and the integral coefficient of the current proportional-integral algorithm unchanged.
In an exemplary embodiment of the present disclosure, the predetermined range of the system operation short circuit capacity ratio may be determined based on the system maximum operation short circuit capacity ratio and the system minimum operation short circuit capacity ratio of the new energy station, and the control parameter table may be generated based on a proportional coefficient and an integral coefficient of a proportional-integral algorithm under different predetermined tidal current conditions and system operation short circuit capacity ratio combinations.
In an exemplary embodiment of the present disclosure, a lower limit value of the predetermined range of the system operation short-circuit capacity ratio may be equal to or greater than a system minimum operation short-circuit capacity ratio, and an upper limit value may be equal to or less than a system maximum operation short-circuit capacity ratio.
The reactive control unit 23 is configured to perform reactive voltage control using a proportional-integral algorithm based on the determined proportional coefficient and integral coefficient.
The reactive voltage control device according to an exemplary embodiment of the present disclosure has been described above with reference to fig. 2. Next, a computing device according to an exemplary embodiment of the present disclosure is described with reference to fig. 3.
Fig. 3 shows a schematic diagram of a computing device according to an example embodiment of the present disclosure.
Referring to fig. 3, the computing device 3 according to an exemplary embodiment of the present disclosure includes a memory 31 and a processor 32, the memory 31 having stored thereon a computer program that, when executed by the processor 32, implements a reactive voltage control method according to an exemplary embodiment of the present disclosure.
In an exemplary embodiment of the disclosure, the computer program, when executed by the processor 32, may implement the steps of: determining a system operation short circuit capacity ratio of the new energy station based on load flow data of a control point of the new energy station, wherein the load flow data comprises at least one of voltage, active power and reactive power of the control point; determining a proportional coefficient and an integral coefficient of a proportional-integral algorithm based on whether the system operation short-circuit capacity ratio is in a preset range; and performing reactive voltage control by using a proportional integral algorithm based on the determined proportional coefficient and integral coefficient.
The computing device illustrated in fig. 3 is only one example and should not impose any limitations on the functionality or scope of use of embodiments of the disclosure.
The reactive voltage control method and apparatus according to an exemplary embodiment of the present disclosure have been described above with reference to fig. 1 to 3. However, it should be understood that: the reactive voltage control device and its units shown in fig. 2 may be respectively configured as software, hardware, firmware, or any combination thereof to perform a specific function, the computing device shown in fig. 2 is not limited to include the above-illustrated components, but some components may be added or deleted as needed, and the above components may also be combined.
According to the reactive voltage control method and device disclosed by the exemplary embodiment of the disclosure, the system operation short-circuit capacity ratio of the new energy station is determined based on the tidal current data of the control point of the new energy station, the proportional coefficient and the integral coefficient of a proportional-integral algorithm are determined based on whether the system operation short-circuit capacity ratio is in a preset range, and the reactive voltage control is performed by using the proportional-integral algorithm based on the determined proportional coefficient and integral coefficient, so that the requirement of a power grid on response time/speed is met when the system SCR changes, accurate response to the power grid can be realized when the power grid strength changes, the operation stability of a power generation unit of each station is guaranteed, the safety and the stability of the power grid and the new energy station are guaranteed, and an extremely important role is played in stabilizing the voltages of the power grid and the new energy station.
While the present disclosure has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present disclosure as defined by the following claims.

Claims (12)

1. A reactive voltage control method, characterized in that the reactive voltage control method comprises:
determining a system operation short circuit capacity ratio of the new energy station based on load flow data of a control point of the new energy station, wherein the load flow data comprises at least one of voltage, active power and reactive power of the control point;
determining a proportional coefficient and an integral coefficient of a proportional-integral algorithm based on whether the system operation short-circuit capacity ratio is in a preset range;
and performing reactive voltage control by using a proportional integral algorithm based on the determined proportional coefficient and integral coefficient.
2. The method of claim 1, wherein the step of determining a system operational short circuit capacity ratio for the new energy station based on the tidal current data of the control point of the new energy station comprises:
calculating the load flow change data of the control points of the new energy station based on the load flow data of the control points of the new energy station;
and determining the system operation short circuit capacity ratio of the new energy station according to the tide data and the tide change data of the control point of the new energy station, the rated voltage of the control point of the new energy station and the rated power of the new energy station.
3. The method according to claim 2, wherein the step of determining the system operational short circuit capacity ratio of the new energy station based on the tidal current data and the tidal current change data of the control points of the new energy station and the rated voltage of the control points of the new energy station and the rated power of the new energy station comprises:
calculating system impedance of the control points of the new energy station according to the load flow data and the load flow change data of the control points of the new energy station;
and determining the system operation short circuit capacity ratio of the new energy station based on the system impedance of the control point of the new energy station, the rated voltage of the control point of the new energy station and the rated power of the new energy station.
4. The method of claim 1, wherein the step of determining the scaling factor and the integration factor of a proportional-integral algorithm based on whether the system operating short circuit capacity ratio is within a predetermined range comprises:
when the system operation short-circuit capacity ratio is in a preset range, determining a proportional coefficient and an integral coefficient of a proportional-integral algorithm from a preset control parameter table according to the load flow data of the control point of the new energy station and the system operation short-circuit capacity ratio;
and when the short-circuit capacity ratio of the system operation is not in the preset range, keeping the proportional coefficient and the integral coefficient of the current proportional-integral algorithm unchanged.
5. The method according to any one of claims 1 to 4,
the predetermined range of the system operating short circuit capacity ratio is determined based on a system maximum operating short circuit capacity ratio and a system minimum operating short circuit capacity ratio of the new energy station,
the control parameter table is generated based on the proportional coefficient and the integral coefficient of a proportional-integral algorithm under the combination of different predetermined tide working conditions and the short-circuit capacity ratio of the system operation,
and the lower limit value of the preset range of the system operation short-circuit capacity ratio is greater than or equal to the system minimum operation short-circuit capacity ratio, and the upper limit value is less than or equal to the system maximum operation short-circuit capacity ratio.
6. A reactive voltage control apparatus, characterized in that the reactive voltage control apparatus comprises:
the system comprises a capacity ratio determining unit, a capacity ratio determining unit and a control unit, wherein the capacity ratio determining unit is configured to determine a system operation short circuit capacity ratio of a new energy station based on power flow data of a control point of the new energy station, and the power flow data comprises at least one of voltage, active power and reactive power of the control point;
a coefficient determination unit configured to determine a proportional coefficient and an integral coefficient of a proportional-integral algorithm based on whether the system operation short-circuit capacity ratio is in a predetermined range; and
a reactive control unit configured to perform reactive voltage control using a proportional-integral algorithm based on the determined proportional coefficient and integral coefficient.
7. The apparatus according to claim 6, wherein the capacity ratio determination unit is configured to:
calculating the load flow change data of the control points of the new energy station based on the load flow data of the control points of the new energy station;
and determining the system operation short circuit capacity ratio of the new energy station according to the tide data and the tide change data of the control point of the new energy station, the rated voltage of the control point of the new energy station and the rated power of the new energy station.
8. The apparatus according to claim 7, wherein the capacity ratio determination unit is configured to:
calculating system impedance of the control points of the new energy station according to the load flow data and the load flow change data of the control points of the new energy station;
and determining the system operation short circuit capacity ratio of the new energy station based on the system impedance of the control point of the new energy station, the rated voltage of the control point of the new energy station and the rated power of the new energy station.
9. The apparatus of claim 8, wherein the coefficient determination unit is configured to:
when the system operation short-circuit capacity ratio is in a preset range, determining a proportional coefficient and an integral coefficient of a proportional-integral algorithm from a preset control parameter table according to the load flow data of the control point of the new energy station and the system operation short-circuit capacity ratio;
and when the short-circuit capacity ratio of the system operation is not in the preset range, keeping the proportional coefficient and the integral coefficient of the current proportional-integral algorithm unchanged.
10. The apparatus according to any one of claims 6-9,
the predetermined range of the system operating short circuit capacity ratio is determined based on a system maximum operating short circuit capacity ratio and a system minimum operating short circuit capacity ratio of the new energy station,
the control parameter table is generated based on a proportionality coefficient and an integral coefficient of a proportional-integral algorithm under the combination of different predetermined tide working conditions and system operation short-circuit capacity ratios, wherein the lower limit value of the predetermined range of the system operation short-circuit capacity ratio is greater than or equal to the system minimum operation short-circuit capacity ratio, and the upper limit value is less than or equal to the system maximum operation short-circuit capacity ratio.
11. A computer-readable storage medium storing a computer program, characterized in that the computer program, when executed by a processor, implements the reactive voltage control method of any of claims 1 to 5.
12. A computing device, the computing device comprising:
at least one processor;
at least one memory storing a computer program that, when executed by the at least one processor, implements the reactive voltage control method of any of claims 1 to 5.
CN202011450485.6A 2020-12-09 2020-12-09 Reactive voltage control method and device Pending CN114614462A (en)

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Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202011450485.6A CN114614462A (en) 2020-12-09 2020-12-09 Reactive voltage control method and device

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Country Link
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