CN113315164B - Reactive voltage control method and device, medium and computing device - Google Patents

Abstract

The disclosure provides a reactive voltage control method and device, a medium and a computing device. The reactive voltage control method comprises the following steps: determining the short-circuit capacity ratio of the system operation according to the short-circuit capacity of the system operation and the rated power of the new energy station; determining a proportional coefficient and an integral coefficient of a proportional-integral algorithm according to the range of the short-circuit capacity ratio of the system; and performing reactive voltage control by using a proportional integral algorithm based on the determined proportional coefficient and integral coefficient. According to the reactive voltage control method provided by the embodiment of the invention, the reactive voltage can be quickly and accurately controlled.

Description

Reactive voltage control method and device, medium and computing device

technical field

The present invention generally relates to the field of new energy sources, and more specifically, relates to a reactive voltage control method and device, a medium, and a computing device.

Background technique

In the entire energy of the power system, with the continuous increase of the proportion of new energy and the continuous increase of the capacity of the single machine, the installed capacity of the station is also hitting new highs repeatedly.

The development of new energy stations has the characteristics of large scale and concentrated development mode. However, due to the inherent intermittent characteristics of new energy power generation, large-scale new energy grid integration has brought great challenges to grid operation. In addition, new energy grid-connected areas often lack local load and conventional power supply support, and the electric energy generated by new energy stations needs to be sent to the load center through long distances, resulting in large reactive voltage fluctuations in power transmission channels with changes in new energy output. Therefore, higher and higher requirements are put forward for the reactive power control and voltage stability of new energy stations.

Although the traditional voltage and reactive power control theory and technology are relatively mature, but due to the constraints of the overall system topology, communication and many other factors, the currently applied reactive power control methods only consider the current time section of the power system, and only find the actual time section. The control logic is triggered only when the measured voltage value of the system exceeds or approaches the threshold, which is actually a kind of hysteresis control and passive control in nature. However, new energy power generation often has large load fluctuations and has a great impact on voltage changes. This leads to the fact that the current single-step regulation method based on the system impedance method cannot meet the control requirements. Therefore, for the station control system, a fast closed-loop control method is required. , so as to quickly track the change of the system voltage, and timely adjust and control the voltage, so that the voltage can be quickly and accurately within the target range of operation control.

Contents of the invention

An object of exemplary embodiments of the present invention is to provide a reactive voltage control method and a reactive voltage control device capable of rapidly controlling reactive voltage.

According to one aspect of the present invention, a reactive voltage control method is provided. The reactive voltage control method includes: determining the system operating short-circuit capacity ratio according to the system operating short-circuit capacity and the rated power of the new energy station; according to the system operating short-circuit capacity ratio The range determines the proportional coefficient and integral coefficient of the proportional integral algorithm; the reactive power voltage control is carried out by using the proportional integral algorithm based on the determined proportional coefficient and integral coefficient.

According to an embodiment of the present invention, the reactive voltage control method may further include: obtaining electrical information of the high-voltage side or low-voltage side of the new energy station; and calculating the operating short-circuit capacity of the system based on the electrical information.

According to an embodiment of the present invention, the step of obtaining the electrical information of the high-voltage side or the low-voltage side of the new energy station may include: obtaining the electrical information of the high-voltage side or the low-voltage side of the new energy station at the current moment and the previous moment The amount of electrical information, the amount of electrical information includes active power, reactive power and voltage; the step of calculating the operating short-circuit capacity of the system based on the amount of electrical information includes: calculating the system based on the amount of electrical information obtained at the current moment and the amount of electrical information at the previous moment Operating short circuit capacity.

According to an embodiment of the present invention, the step of determining the proportional coefficient and the integral coefficient of the proportional-integral algorithm according to the range of the operating short-circuit capacity ratio of the system may include: in response to the operating short-circuit capacity ratio of the system being greater than a predetermined threshold, determining that the operating short-circuit capacity ratio of the system is valid .

According to an embodiment of the present invention, the step of determining the proportional coefficient and the integral coefficient of the proportional-integral algorithm according to the range of the operating short-circuit capacity ratio of the system may include: determining different proportional coefficients when the operating short-circuit capacity ratio of the system is in a different range and different integral coefficients.

According to an embodiment of the present invention, when the operating short-circuit capacity ratio of the system is greater than the first predetermined value, the proportional coefficient and the integral coefficient of the proportional-integral algorithm may be determined to be the first proportional coefficient and the first integral coefficient respectively; when the operating short-circuit capacity ratio of the system is greater than When the second predetermined value is less than or equal to the first predetermined value, the proportional coefficient and integral coefficient of the proportional integral algorithm can be determined to be the second proportional coefficient and the second integral coefficient respectively; when the system operation short-circuit capacity ratio is greater than the third predetermined value and less than or equal to When the second predetermined value is used, the proportional coefficient and the integral coefficient of the proportional integral algorithm may be determined to be the third proportional coefficient and the third integral coefficient respectively.

According to an embodiment of the present invention, the step of using the proportional-integral algorithm based on the determined proportional coefficient and integral coefficient to control the reactive voltage may include: taking the deviation between the target value of the reactive voltage and the actual reactive voltage as the input of the proportional-integral algorithm, Calculate the control command of the reactive power source of the new energy station, and issue the control command to the reactive power source so that the reactive power voltage approaches the target value of the reactive power voltage.

According to another aspect of the present invention, a computer-readable storage medium is provided. The computer-readable storage medium stores instructions or codes. When the instructions or codes are executed by a processor, the above reactive voltage control method is implemented.

According to another aspect of the present invention, a reactive voltage control device is provided. The reactive voltage control device may include: a system operating short-circuit capacity ratio determination module configured to calculate the system operating short-circuit capacity and the rated power of the new energy station The system operating short-circuit capacity ratio; the coefficient determination module is configured to determine the proportional coefficient and the integral coefficient of the proportional-integral controller according to the range of the system operating short-circuit capacity ratio; the reactive voltage control module is configured to use the determined proportional coefficient based on The proportional-integral controller with integral coefficient performs reactive voltage control.

According to an embodiment of the present invention, the reactive voltage control device may further include: a detection module configured to obtain electrical information on the high-voltage side or low-voltage side of the new energy station; a calculation module configured to calculate the system based on the electrical information Operating short circuit capacity.

According to an embodiment of the present invention, the coefficient determination module may be further configured to: determine that the system operating short-circuit capacity ratio is valid in response to the system operating short-circuit capacity ratio being greater than a predetermined threshold.

According to an embodiment of the present invention, the coefficient determination module may be further configured to: in response to when the operating short-circuit capacity ratio of the system is greater than the first predetermined value, determine the proportional coefficient and the integral coefficient of the proportional-integral controller to be the first proportional coefficient and the first Integral coefficient; in response to when the system operating short-circuit capacity ratio is greater than the second predetermined value and less than or equal to the first predetermined value, the proportional coefficient and the integral coefficient of the proportional integral controller are determined to be the second proportional coefficient and the second integral coefficient respectively; in response to the system The operating short-circuit capacity ratio is greater than the third predetermined value and less than or equal to the second predetermined value, and the proportional coefficient and the integral coefficient of the proportional-integral controller are determined to be the third proportional coefficient and the third integral coefficient respectively.

According to another aspect of the present invention, a computing device is provided, the computing device includes a computer-readable storage medium and a processor, the computer-readable storage medium stores instructions or codes, and when the instructions or codes are executed by the processor, the above reactive voltage control method.

Additional aspects and/or advantages of the present general inventive concept will be partially set forth in the following description, and some will be clear from the description, or can be learned through practice of the present general inventive concept.

Description of drawings

The above and other objects and features of exemplary embodiments of the present invention will become more apparent from the following descriptions in conjunction with the accompanying drawings exemplarily showing the embodiments, in which:

1 is a flowchart showing a reactive voltage control method according to a first embodiment of the present invention;

FIG. 2 is a flowchart showing a reactive voltage control method according to a second embodiment of the present invention;

FIG. 3 is a flowchart showing a reactive voltage control method according to a third embodiment of the present invention;

Fig. 4 is a simplified equivalent circuit diagram of the power supply system of the new energy station.

5 is a block diagram showing a reactive voltage control device according to a first embodiment of the present invention;

FIG. 6 is a block diagram showing a reactive voltage control device according to a second embodiment of the present invention.

Detailed ways

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like parts throughout. The embodiments are described below in order to explain the present invention by referring to the figures.

According to the embodiment of the present invention, a fast PI control strategy is adopted to control the reactive voltage of the power supply system, and the overall control has the advantages of fast adjustment speed and high precision.

In addition, the present invention further considers the variability of the system operation mode, introduces the real-time system operation short-circuit capacity, and calculates the real-time system operation short-circuit capacity ratio of the new energy station according to the real-time system operation short-circuit capacity, so as to represent the strength of the system , and further divide the PI parameters as a whole according to the strength of the system, and carry out segmental control.

In the actual operation of the new energy power supply system, if there is a major change in the operation mode, it will be directly reflected in the system operating short-circuit capacity ratio, so that the system reactive voltage control parameters can be adjusted in real time in combination with the system operating short-circuit capacity ratio. Adjustment, which enables the PI control parameters to be corrected online, ensuring that the overall control can guarantee high precision and fast response speed in the entire time dimension, and at the same time, it also improves the applicability of the overall control algorithm and ensures the stability of the system operation control sex.

The reactive voltage control method and device according to the embodiments of the present invention can be used to control the reactive voltage of a new energy station such as a wind farm, but is not limited thereto. Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

Fig. 1 is a flow chart showing a reactive voltage control method according to a first embodiment of the present invention, Fig. 2 is a flow chart showing a reactive voltage control method according to a second embodiment of the present invention, and Fig. 3 is a flow chart showing A flowchart of a reactive voltage control method according to a third embodiment of the present invention is shown, and FIG. 4 is a simplified equivalent circuit diagram of a power supply system of a new energy station.

According to an embodiment of the present invention, the reactive voltage control method may include steps S110, S120 and S130.

In step S110, the operating short-circuit capacity ratio of the system is determined according to the operating short-circuit capacity of the system and the rated power of the new energy station.

As mentioned above, if the operation mode of the power supply system of the new energy station changes greatly, the operating short-circuit capacity ratio of the system will change accordingly. Therefore, the operating short-circuit capacity ratio of the system can reflect the above changes. Real-time adjustment is made to the control parameters (proportional-integral control parameters) of the reactive power and voltage of the system, which makes the proportional-integral (PI) control parameters (the PI control parameters here include coefficients or constants and integral terms of the proportional term of the PI algorithm or PI controller The coefficients or constants, hereinafter referred to as proportional coefficients and integral coefficients) can be corrected online.

The operating short-circuit capacity of the system can be calculated based on the electrical information of the high-voltage side or low-voltage side of the new energy station. The reactive voltage control method of the embodiment of the present invention may also include the step of obtaining the electrical information of the high-voltage side or the low-voltage side of the new energy station and the step of calculating the operating short-circuit capacity of the system based on the electrical information. The new energy field station here may be a wind farm station or a photovoltaic station, or a station including a wind power generation unit and/or a photovoltaic power generation system.

The electrical information of the high-voltage side or low-voltage side of the new energy station can be measured in real time by various sensors.

The system operating short-circuit capacity ratio can be obtained by dividing the system operating short-circuit capacity by the rated power of the new energy station, but is not limited thereto.

In step S120, the proportional coefficient and integral coefficient of the proportional-integral algorithm are determined according to the range of the operating short-circuit capacity ratio of the system. Specifically, when the operating short-circuit capacity ratio of the system changes within a certain range, the PI control parameter can be set to the same control parameter, that is, the proportional coefficient and the integral coefficient are also unchanged.

In step S130, reactive voltage control is performed using a proportional-integral algorithm based on the determined proportional coefficient and integral coefficient. Specifically, the step of using the proportional-integral algorithm based on the determined proportional coefficient and integral coefficient to control the reactive voltage may include: taking the deviation between the target value of the reactive voltage and the actual reactive voltage as the input of the proportional-integral algorithm, and calculating the new The reactive power source control command of the energy station, and the control command is issued to the reactive power source, so that the reactive voltage approaches the reactive voltage target value.

Here, the deviation between the reactive voltage target value and the actual reactive voltage is used as the input of the proportional integral algorithm. The variables are jointly controlled.

It should be noted that the PI algorithm or PI controller of the present invention can also be regarded as a PID algorithm or a PID controller, wherein the differential coefficient is zero.

The step of acquiring the electrical information of the high-voltage side or the low-voltage side of the new energy station may include: acquiring electrical information at different times, specifically, acquiring the electrical information at the current moment and the electrical information at the previous moment. In this case, the step of calculating the system operating short-circuit capacity based on the electrical information may include: calculating the system operating short-circuit capacity S _kOSC based on the acquired electrical information at the current moment and the electrical information at the previous moment.

Specifically, as shown in FIG. 2 , according to an embodiment of the present invention, the reactive voltage control method may include steps S210 , S220 , S230 and S240 .

In step S210, the electrical information at the current moment (for example, time k) and the electrical information at the previous moment (for example, k-1 time) are acquired. As an example, the electrical information may include the high-voltage side of the new energy station or Active power, reactive power and voltage on the low-voltage side. That is, the amount of electrical information at the current moment (for example, time k) and the amount of electrical information at the previous moment (for example, time k-1) of the high-voltage side or low-voltage side of the new energy station can be obtained.

As an example, the typical OSCR value of the system can be obtained through tuning or simulation according to a specific site, so that the optimal PI control parameters can be obtained through simulation or actual project debugging. The optimal PI control parameters here can be used as initial values or default values.

In step S220, the operating short-circuit capacity of the system is calculated based on the acquired electrical information at the current moment and the electrical information at the previous moment.

The following will describe how to determine the operating short-circuit capacity ratio of the system based on the amount of electrical information and the rated power of the new energy station in conjunction with Figure 4.

Specifically, as shown in Figure 4, the equivalent potential of the system during operation is E=E _x +jE _y , the equivalent impedance of the system is Z=R+jX, and the main transformer of the new energy station (for example, a wind farm) has a high voltage The voltage amplitude on the side is V, the active power is P, the reactive power is Q, and the operating short-circuit capacity of the system is S _OSC .

At time k, the equivalent potential of the system is E _k ＝E _kx +jE _ky , the equivalent impedance is Z _k ＝R _k +jX _k , the voltage amplitude of the main transformer high voltage side of the new energy station (for example, wind farm) is V _k , the active power is P _k , the reactive power is Q _k , and the operating short-circuit capacity of the system is S _kOSC .

According to the active power, reactive power and voltage, the current value of the system at time k can be calculated, as described in Equation 1 below.

After sorting, the following formula can be obtained:

That is, the following formula 2 can be obtained:

At time k-1, the equivalent potential of the system is E _k-1 ＝E _(k-1)x +jE _(k-1)y , and the equivalent impedance is Z _k-1 ＝R _k-1 +jX _{k- 1.} The voltage amplitude on the high voltage side of the main transformer is V _k-1 , the active power is P _k-1 , and the reactive power is Q _k-1 .

Then the following formula 3 can be obtained:

According to the operating characteristics of the system, the following formulas hold for k time and k-1 time:

Among them, E _kx , E _ky , E _(k-1)x , and E _(k-1)y are the real part of the equivalent potential at time k, the imaginary part of the equivalent potential at time k, and the equivalent potential at time k-1 The real part of , the imaginary part of the equivalent potential at time k-1, R _k , X _k , R _k-1 , and X _k-1 are the resistance of the system at time k, the reactance of the system at time k, and the Resistance, reactance of the system at time k-1, formula (2), formula (3), formula (4) are combined to obtain formula 5, and then E _kx , E _ky , R _k , X _k can be solved, have:

make:

|H|＝(-V _k Q _(k-1) +V _(k-1) Q _k ) ² +(V _k P _(k-1) -V _(k-1) P _k ) ²

|B|＝V _k V _(k-1) (V _(k-1) -V _k )(Q _k Q _(k-1) +Q _(k-1) P _k )

And then get:

It can be obtained that the operating short-circuit capacity of the system at time k is:

Since the voltage level of the access system is generally high, R _k can take the value of 0 in the calculation process, then the formula (7) can be changed into:

It should be noted that since the voltage level of the access system is generally high, _Rk can take the value of 0 during the calculation process, which is determined by the system characteristics. In practical applications, the voltage and current values of the high-voltage side or low-voltage side of the new energy station are also selected to calculate the system operating capacity according to actual needs.

Since the reactive voltage control generally controls the high-voltage bus voltage of the new energy station, the optimal calculation point is the high-voltage side of the new energy station.

In step S230, the operating short-circuit capacity ratio of the system is determined according to the operating short-circuit capacity of the system and the rated power of the new energy station.

Specifically, the system operation short-circuit capacity ratio of the new energy station at time k is:

P _t =n×P _d (Formula 10)

P _t is the rated power of a new energy site (for example, a wind farm). When the site is a wind farm, p _d can be the rated power of a single wind turbine, and n is the number of wind turbines in the wind farm.

In step S240, the proportional coefficient and the integral coefficient of the proportional-integral algorithm are determined according to the range of the operating short-circuit capacity ratio of the system.

In step S250, reactive voltage control is performed using a proportional-integral algorithm based on the determined proportional coefficient and integral coefficient. Specifically, as described above, the deviation between the reactive voltage target value and the actual reactive voltage is used as the input of the proportional integral algorithm to calculate the control command of the reactive power source of the new energy station, and issue a command to the reactive power source The control instruction is to make the reactive voltage approach the reactive voltage target value.

The step of determining the proportional coefficient and the integral coefficient of the proportional integral algorithm according to the range of the operating short-circuit capacity ratio of the system (for example, step S240 ) may include: determining whether the operating short-circuit capacity ratio of the system is valid.

As an example, in response to the system operating short circuit capacity ratio being greater than a predetermined threshold (eg, the third predetermined value n3 mentioned below), it is determined that the system operating short circuit capacity ratio is valid. In response to the system operating short circuit capacity ratio being less than or equal to the third predetermined value, it is determined that the system operating short circuit capacity ratio is invalid.

Therefore, the step of determining the proportional coefficient and the integral coefficient of the proportional-integral algorithm according to the range in which the operating short-circuit capacity ratio of the system is located (for example, step S240) may include responding to the operating short-circuit capacity ratio of the system being greater than a predetermined threshold (for example, the first mentioned below 3. Predetermined value n3), the effective step of determining the operating short-circuit capacity ratio of the system.

Generally, the operating short-circuit capacity ratio of the system will not be less than or equal to the third predetermined value. If there is an extreme situation, the PI control parameters can be kept, and the reactive voltage can be controlled by other methods.

The step of determining the proportional coefficient and the integral coefficient of the proportional-integral algorithm according to the range of the operating short-circuit capacity ratio of the system (for example, step S240) may include or may further include: when the operating short-circuit capacity ratio of the system is in a different range, determine different proportional coefficients and different integral coefficients.

When the operating short-circuit capacity ratio of the system changes within a certain range, the PI control parameters can be set to the same control parameters, that is, the proportional coefficient and the integral coefficient remain unchanged. When the operating short-circuit capacity ratio of the system changes in another range, the PI control parameter can be set as another control parameter.

The following will describe a flow chart of segmented control of PI control parameters according to the ranges of the PI control parameters in conjunction with FIG. 3 . The step of determining the proportional coefficient and the integral coefficient of the proportional-integral algorithm (for example, step S240 ) according to the range of the operating short-circuit capacity ratio of the system may include steps S2401 , S2402 , S2403 and S2404 .

As shown in Figure 3, in step S2401, it can be judged whether the system operating short-circuit capacity ratio (OSCR) is greater than the first predetermined value (n1), if OSCR is greater than the first predetermined value, then the first set of PI parameters (or called PI control parameters), where n1 can be greater than or equal to 5, and can be set according to engineering applications. After actual engineering applications, the preferred recommended value is 5.

Specifically, when the operating short-circuit capacity ratio of the system is greater than the first predetermined value (n1), the proportional coefficient and the integral coefficient of the proportional-integral algorithm may be determined to be the first proportional coefficient and the first integral coefficient, respectively. In other words, when the operating short-circuit capacity ratio of the system changes within a range larger than the first predetermined value, the proportional coefficient can be kept as the first proportional coefficient, and the integral coefficient can be kept as the first integral coefficient.

In step S2402, when n1≥OSCR>n2 (the second predetermined value), the second set of PI parameters can be used. Here, n1>n2≥3 can be set according to engineering applications. After actual engineering applications, the optimal value of n2 The recommended value is 3.

Specifically, when the operating short-circuit capacity ratio of the system is greater than the second predetermined value (n2) and less than or equal to the first predetermined value (n1), it can be determined that the proportional coefficient and integral coefficient of the proportional-integral algorithm are the second proportional coefficient and the second integral coefficient.

In other words, when the operating short-circuit capacity ratio of the system varies within the range greater than the second predetermined value and less than or equal to the first predetermined value, the proportional coefficient can be kept as the second proportional coefficient, and the integral coefficient can be kept as the second integral coefficient.

In step S2403, when n2≥OSCR>n3 (the third predetermined value), the third group of PI parameters can be used. Here, n3 can be greater than or equal to 2, and n3 can be set according to engineering applications. After actual engineering applications, it is recommended The value is 2.

When the system operating short-circuit capacity ratio is greater than the third predetermined value (n3) and less than or equal to the second predetermined value (n2), the proportional coefficient and integral coefficient of the proportional integral algorithm can be determined to be the third proportional coefficient and the third integral coefficient respectively.

In other words, when the operating short-circuit capacity ratio of the system changes within the range between the third predetermined value and less than or equal to the second predetermined value, the proportional coefficient can be kept as the third proportional coefficient, and the integral coefficient can be kept as the third integral coefficient.

The first proportional coefficient, the second proportional coefficient, the third proportional coefficient, the first integral coefficient, the second integral coefficient and the third integral coefficient may be optimal PI control parameters of the OSCR within a corresponding range, and may be predetermined.

In step S2404, when the operating short-circuit capacity ratio of the system is less than or equal to the third predetermined value n3, the PI parameters may be kept different.

In step S250, the proportional integral algorithm based on the determined proportional coefficient and integral coefficient is used for reactive voltage control. Specifically, the deviation between the target value of reactive voltage and the actual reactive voltage can be used as the input of the proportional integral algorithm to calculate the new energy The control command of the reactive power source of the station, and sends the control command to the reactive power source, so that the reactive voltage approaches the reactive voltage target value.

The reactive voltage control method and device according to the embodiments of the present invention can adjust or control proportional-integral (PI) control parameters in sections based on the range of the operating short-circuit capacity ratio (OSCR) of the system, thereby adjusting the PI control parameters in real time to improve Reactive voltage control accuracy and adjustment speed.

The current reactive power and voltage control mostly adopts a fixed control method, that is, the system control fixed value parameters cannot be corrected immediately with the change of the system operation mode, which leads to the use of fixed value reactive voltage control when the system operation mode changes. The system cannot sense system changes in time, which makes the control effect of reactive power and voltage control of the station very good under the current time section, but once the system operation mode changes, the overall control effect is no longer ideal, and more seriously, the system The greater the change in the operation mode, the worse the overall control effect, and the change in the system operation mode is very common in the system, which brings great difficulties to the overall control to meet the control requirements in the entire time dimension, resulting in reactive voltage in the The expected effect cannot be achieved on the control process and goals, and ultimately the qualified rate of voltage control cannot be fundamentally improved.

According to the reactive voltage control method of the embodiment of the present invention, the PI control parameters can be adjusted in real time online, and the control rate, control accuracy and control effect are all better than the current reactive voltage control strategy of sampling fixed control mode.

FIG. 5 is a block diagram showing a reactive voltage control device according to a first embodiment of the present invention, and FIG. 6 is a block diagram showing a reactive voltage control device according to a second embodiment of the present invention.

According to an embodiment of the present invention, the reactive voltage control device 400 may include a system operation short circuit capacity ratio determination module 410 , a coefficient determination module 420 and a reactive voltage control module 430 . The reactive voltage control device 400 may also include a detection module 401 and a calculation module 402 .

The system operating short-circuit capacity ratio determination module 410 can calculate the system operating short-circuit capacity ratio according to the system operating short-circuit capacity and the rated power of the new energy station. The calculation methods of the system operating short-circuit capacity and the system operating short-circuit capacity ratio can be described above, and will not be repeated here. In addition, it should be noted that the above method of calculating the system operating short-circuit capacity and the system operating short-circuit capacity ratio is only an example, and the present invention is not limited thereto.

The coefficient determination module 420 can determine whether the system operating short circuit capacity ratio is valid. If the short-circuit capacity ratio of the system is effective, it can be controlled by segmented control. If the short-circuit capacity ratio of the system is invalid, the PI control parameters can be maintained or other control strategies can be adopted.

The coefficient determining module 420 may determine that the system operating short circuit capacity ratio is valid in response to the system operating short circuit capacity ratio being greater than a predetermined threshold.

The coefficient determination module 420 can determine the proportional coefficient and integral coefficient of the proportional-integral controller according to the range of the operating short-circuit capacity ratio of the system. Specifically, the coefficient determination module 420 can determine different The proportional coefficient and different integral coefficients can also keep the PI control parameters constant in response to the system operating short-circuit capacity ratio changing within a certain continuous range.

It is possible to detect the amount of electrical information in real time, or receive the amount of electrical information from other modules.

As an example, the reactive power and voltage control device 400 may also include a detection module 401 and a calculation module 402. The detection module 401 can obtain the electrical information of the high-voltage side or the low-voltage side of the new energy station, and the calculation module 402 can be based on the electrical information calculation system. Operating short circuit capacity. The detection module 401 may include various sensors, and the calculation module 402, the coefficient determination module 420, and the system operation short-circuit capacity ratio determination module 410 can all be realized by software and/or hardware.

As an example, the detection module 401 can obtain the electrical information amount at the current moment (for example, k moment) and the electrical information amount at the previous moment (for example, k-1 moment), and the calculation module 402 can be based on the obtained electrical information amount at the current moment And the amount of electrical information at the last moment is used to calculate the operating short-circuit capacity of the system.

The specific calculation method is as described above. The system operating short-circuit capacity and the system operating short-circuit capacity ratio can be calculated according to the electrical information such as active power, reactive power, and voltage of the high-voltage side or low-voltage side of the new energy station.

The coefficient determining module 420 may determine the proportional coefficient and the integral coefficient of the proportional-integral controller as the first proportional coefficient and the first integral coefficient respectively in response to the system operating short-circuit capacity ratio being greater than the first predetermined value. That is, if the OSCR is greater than the first predetermined value, the coefficient determination module 420 may employ the first set of PI parameters. In other words, when the operating short-circuit capacity ratio of the system changes within a range greater than the first predetermined value, the coefficient determination module 420 may maintain the proportional coefficient as the first proportional coefficient and maintain the integral coefficient as the first integral coefficient.

The coefficient determination module 420 may determine the proportional coefficient and the integral coefficient of the proportional-integral controller as the second proportional coefficient and the second integral coefficient respectively in response to the system operating short-circuit capacity ratio being greater than the second predetermined value and less than or equal to the first predetermined value.

That is to say, when n1≧OSCR>n2 (the second predetermined value), the coefficient determination module 420 can adopt the second set of PI parameters. That is, when the operating short-circuit capacity ratio of the system changes within a range greater than the second predetermined value and less than or equal to the first predetermined value, the coefficient determination module 420 may maintain the proportional coefficient as the second proportional coefficient, and maintain the integral coefficient as the second Integral factor.

The coefficient determining module 420 may determine the proportional coefficient and the integral coefficient of the proportional-integral controller as the third proportional coefficient and the third integral coefficient respectively in response to the system operating short-circuit capacity ratio being greater than the third predetermined value and less than or equal to the second predetermined value.

That is, if n2≧OSCR>n3 (the third predetermined value), the coefficient determination module 420 can adopt the third set of PI parameters. That is, when the operating short-circuit capacity ratio of the system changes within the range of the third predetermined value and less than or equal to the second predetermined value, the coefficient determination module 420 may maintain the proportional coefficient as the third proportional coefficient, and maintain the integral coefficient as the third integral coefficient.

The reactive voltage control module 430 may use a proportional integral controller based on the determined proportional coefficient and integral coefficient to perform reactive voltage control, where the proportional integral controller controls a part of the reactive voltage control module 430 .

Specifically, the reactive voltage control module 430 can use the deviation between the target value of reactive voltage and the actual reactive voltage as the input of the proportional integral algorithm, calculate the control command of the reactive power source of the new energy station, and issue the command to the reactive power source The control instruction is to make the reactive voltage approach the target value of the reactive voltage.

The various operations of the above steps can be written as software programs or instructions, therefore, the feedforward control method according to the exemplary embodiment of the present invention can be implemented via software, and the computer-readable storage medium of the exemplary embodiment of the present invention can store A computer program, when the computer program is executed by a processor, implements the reactive voltage control method as described in the above exemplary embodiments.

According to various embodiments of the present disclosure, means (such as modules or their functions) or methods may be implemented by programs or instructions stored in computer-readable storage media. When the instruction is executed by the processor, the processor may perform the function corresponding to the instruction or execute the method corresponding to the instruction. At least a portion of a module may be implemented (eg, executed) by a processor. At least a portion of the programming modules may include modules, programs, routines, sets of instructions, and procedures for performing at least one function. In one example, instructions or software include machine code (such as that produced by a compiler) for direct execution by one or more processors or computers. In another example, instructions or software comprise higher-level code that is executed by one or more processors or computers using an interpreter. Instructions or software may be written using any programming language based on the block diagrams and flowcharts shown in the drawings and the corresponding descriptions in the specification.

Computer-readable storage media include magnetic media such as floppy disks and magnetic tapes, optical media (including compact disc (CD) ROMs and DVD ROMs), magneto-optical media such as floppy disks, devices such as ROM, RAM, etc. designed to store and execute program commands hardware device and flash memory. The program commands include language codes executable by a computer using an interpreter and machine language codes generated by a compiler. The above-described hardware devices may be realized by one or more software modules for performing operations of various embodiments of the present disclosure.

A module or programming module of the present disclosure may include at least one of the aforementioned components with some components omitted or other components added. The operations of the modules, programming modules, or other components may be performed sequentially, in parallel, in a loop, or heuristically. Additionally, some operations may be performed in a different order, omitted, or augmented with other operations.

The computer-readable storage medium and/or the reactive voltage control device of the exemplary embodiments of the present invention may be part of a computing device, a controller, or a control system.

For example, an exemplary embodiment of the present invention may provide a computing device, which may include: a processor (not shown) and a memory (not shown, which may be a computer-readable storage medium), wherein the memory stores There is a computer program (code or instruction), and when the computer program is executed by the processor, the reactive voltage control method as described in the above exemplary embodiments is realized.

According to the reactive voltage control method and reactive voltage control device of the embodiments of the present invention, PI control parameters can be adjusted in real time online, and the control speed and control accuracy of reactive voltage control are improved.

While a few exemplary embodiments of the present invention have been shown and described, it should be understood by those skilled in the art that such modifications may be made without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents. Embodiments are modified, for example, technical features of different embodiments may be combined.

Claims (10)

1. A reactive voltage control method, characterized in that, comprising: Determine the system operating short-circuit capacity ratio according to the ratio of the system operating short-circuit capacity to the rated power of the new energy station; Determine the proportional coefficient and integral coefficient of the proportional-integral algorithm according to the range in which the operating short-circuit capacity ratio of the system is located; The reactive power voltage control is performed using the proportional-integral algorithm based on the determined proportional coefficient and integral coefficient, Wherein, the operating short-circuit capacity of the system is the short-circuit capacity of the system of the new energy station during operation, Wherein, the operating short-circuit capacity ratio of the system is the operating short-circuit ratio of the system, Wherein, the step of determining the proportional coefficient and the integral coefficient of the proportional integral algorithm according to the range in which the operating short-circuit capacity ratio of the system is located includes: When the operating short-circuit capacity ratio of the system is greater than the first predetermined value, determine the proportional coefficient and the integral coefficient of the proportional integral algorithm as the first proportional coefficient and the first integral coefficient respectively, When the operating short-circuit capacity ratio of the system is greater than the second predetermined value and less than or equal to the first predetermined value, the proportional coefficient and the integral coefficient of the proportional integral algorithm are determined to be the second proportional coefficient and the second integral coefficient respectively, When the operating short-circuit capacity ratio of the system is greater than the third predetermined value and less than or equal to the second predetermined value, the proportional coefficient and the integral coefficient of the proportional integral algorithm are determined to be the third proportional coefficient and the third integral coefficient respectively, Wherein, the first predetermined value is greater than the second predetermined value, the second predetermined value is greater than the third predetermined value, and the second predetermined value is 3. 2. The reactive voltage control method according to claim 1, further comprising: Obtain the electrical information of the high-voltage side or low-voltage side of the new energy station; The operating short-circuit capacity of the system is calculated based on the amount of electrical information. 3. The reactive voltage control method according to claim 2, characterized in that, The step of obtaining the electrical information of the high-voltage side or the low-voltage side of the new energy station includes: obtaining the electrical information of the high-voltage side or the low-voltage side of the new energy station at the current moment and the electrical information of the previous moment. The amount of information includes active power, reactive power and voltage; The step of calculating the operating short-circuit capacity of the system based on the amount of electrical information includes: calculating the operating short-circuit capacity of the system based on the acquired electrical information amount at the current moment and the amount of electrical information at the previous moment. 4. The reactive voltage control method according to any one of claims 1 to 3, characterized in that the step of determining the proportional coefficient and the integral coefficient of the proportional integral algorithm according to the range in which the operating short-circuit capacity ratio of the system is located is further The method includes: determining that the system operating short-circuit capacity ratio is valid in response to the system operating short-circuit capacity ratio being greater than a predetermined threshold. 5. The reactive voltage control method according to claim 1, characterized in that, the step of using the proportional-integral algorithm based on the determined proportional coefficient and integral coefficient to carry out reactive voltage control comprises: using the reactive voltage target value and the actual reactive voltage The deviation of the work voltage is used as the input of the proportional integral algorithm to calculate the control command of the reactive power source of the new energy station, and issue the control command to the reactive power source so that the reactive power voltage approaches the desired value. The reactive voltage target value mentioned above. 6. A computer-readable storage medium, characterized in that the computer-readable storage medium stores instructions or codes, and when the instructions or codes are executed by a processor, any one of claims 1 to 5 is implemented. The reactive voltage control method described above. 7. A reactive voltage control device, characterized in that it comprises: The system operating short-circuit capacity ratio determination module is configured to calculate the system operating short-circuit capacity ratio according to the ratio of the system operating short-circuit capacity to the rated power of the new energy station; The coefficient determination module is configured to determine the proportional coefficient and the integral coefficient of the proportional-integral controller according to the range in which the operating short-circuit capacity ratio of the system is located; a reactive voltage control module configured to perform reactive voltage control using a proportional integral controller based on the determined proportional and integral coefficients, Wherein, the operating short-circuit capacity of the system is the short-circuit capacity of the system of the new energy station during operation, Wherein, the operating short-circuit capacity ratio of the system is the operating short-circuit ratio of the system, Wherein, the coefficient determination module is further configured as: In response to the operating short-circuit capacity ratio of the system being greater than a first predetermined value, determining the proportional coefficient and the integral coefficient of the proportional-integral controller to be the first proportional coefficient and the first integral coefficient respectively; In response to the system operating short-circuit capacity ratio being greater than a second predetermined value and less than or equal to a first predetermined value, determining the proportional coefficient and integral coefficient of the proportional-integral controller to be a second proportional coefficient and a second integral coefficient, respectively; In response to the system operating short-circuit capacity ratio being greater than a third predetermined value and less than or equal to a second predetermined value, determining the proportional coefficient and integral coefficient of the proportional-integral controller to be a third proportional coefficient and a third integral coefficient, respectively, Wherein, the first predetermined value is greater than the second predetermined value, the second predetermined value is greater than the third predetermined value, and the second predetermined value is 3. 8. The reactive voltage control device according to claim 7, further comprising: The detection module is configured to obtain the electrical information of the high-voltage side or the low-voltage side of the new energy station; A calculation module configured to calculate the operating short-circuit capacity of the system based on the electrical information. 9. The reactive power voltage control device according to claim 7 or 8, wherein the coefficient determining module is further configured to: determine that the system operating short circuit capacity ratio is greater than a predetermined threshold Capacity ratio is effective. 10. A computing device, characterized in that it comprises: a computer-readable storage medium and a processor, the computer-readable storage medium stores instructions or codes, and when the instructions or codes are executed by the processor, the The reactive voltage control method according to any one of claims 1 to 5.

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