CN114336669A

CN114336669A - Control method, device and equipment for rapid reactive compensation and storage medium

Info

Publication number: CN114336669A
Application number: CN202210244147.XA
Authority: CN
Inventors: 宋国伟; 李新娟; 秦玲; 王建光; 宋一鸣; 李姗姗; 李波
Original assignee: Dongfang Power Beijing Technology Co ltd
Current assignee: Dongfang Power Beijing Technology Co ltd
Priority date: 2022-03-14
Filing date: 2022-03-14
Publication date: 2022-04-12
Anticipated expiration: 2042-03-14
Also published as: CN114336669B

Abstract

The application provides a control method, a device, equipment and a storage medium for rapid reactive power compensation, and specifically comprises the following steps: collecting a three-phase electric signal sequence from a target power utilization system, selecting one phase electric signal sequence as a target electric signal sequence, and taking an analog-to-digital conversion result of the target electric signal sequence as basic control data; when reactive compensation is carried out, basic control data in the current half detection period are utilized to calculate a first power factor of the current half detection period; acquiring a second power factor of the first half of the detection period, and taking the sum of the first power factor and the second power factor as the actual power factor of the complete detection period; and controlling the switching state of the compensation device by judging whether the actual power factor is within the standard power factor interval of the target power utilization system. Therefore, through a half-wave detection mode, the response time of the compensation device can be shortened, and control errors caused by asymmetrical upper and lower waves of a system waveform and offset of a middle bit line are avoided.

Description

Control method, device and equipment for rapid reactive compensation and storage medium

Technical Field

The application relates to the technical field of reactive power compensation, in particular to a control method, a device, equipment and a storage medium for rapid reactive power compensation.

Background

Reactive compensation, also called reactive power compensation, is a technique for increasing the power factor of the grid, reducing the losses of the power supply transformer and the transmission line, so as to increase the power supply efficiency and improve the power supply environment in the power supply system. Therefore, the reactive compensation device is in an indispensable and very important position in the power supply system, the compensation device is reasonably controlled, the loss of the power grid can be reduced to the maximum extent, and the power supply efficiency and the power supply quality of the power grid are improved.

Currently, in passive compensation schemes, a contactor switch is often used to control the switching state of a compensation capacitor in a power system. Taking the scheme of switching the compensation capacitor by the contactor switch as an example, according to the traditional control algorithm, relevant control parameters such as active power, reactive power, power factor and the like of a power grid in the power utilization system can be obtained by calculation at least after voltage and current data of a whole cycle are detected in a whole-wave detection mode. At this time, the switching speed of the compensation capacitor is slow, usually in the order of seconds, and cannot meet the compensation requirements of part of application scenes (such as flying shear processes in the steel industry, spot welder operation in the automobile industry and other actual operation scenes) requiring rapid reactive compensation, so that the speed of reactive compensation is low.

Disclosure of Invention

In view of the above, an object of the present invention is to provide a method, an apparatus, a device and a storage medium for controlling fast reactive compensation, which can shorten the response time of a compensation apparatus and avoid control errors caused by asymmetry of upper and lower waves of a system waveform and offset of a median line in a half-wave detection manner, thereby increasing the speed and accuracy of reactive compensation on a target power system and meeting the demand of fast reactive compensation on the target power system.

In a first aspect, an embodiment of the present application provides a control method for fast reactive power compensation, where the control method is applied to a target controller, where the target controller is used to control a compensation device to provide reactive power compensation service for a target power utilization system; the control method comprises the following steps:

acquiring three-phase electric signals in the target power utilization system according to a preset sampling frequency to obtain a three-phase electric signal sequence; the three-phase electric signals are used for representing each corresponding voltage signal and current signal in three phases;

selecting one phase electric signal sequence from the three-phase electric signal sequences as a target electric signal sequence, and using an analog-to-digital conversion result of the target electric signal sequence as basic control data of the compensation device;

in the process that the compensation device provides reactive compensation service for the target power utilization system, calculating a first power factor in a current half detection period by using the basic control data acquired in the current half detection period; the period length of the complete detection period is determined according to the power utilization frequency of the target power utilization system;

acquiring a second power factor in the last half detection period, and taking the accumulated result of the first power factor and the second power factor as the actual power factor in the complete detection period; wherein the last half detection period and the current half detection period form one complete detection period;

and judging whether the actual power factor is within a standard power factor interval of the target power utilization system or not, and controlling the switching state of the compensation device in the target power utilization system according to a judgment result.

In an optional implementation manner, the controlling, according to the determination result, the switching state of the compensation device in the target power utilization system includes:

when the actual power factor is detected to be larger than a first target power factor or the actual power factor is detected to be negative, controlling the compensation device to execute the removal operation of the compensation capacity; wherein the first target power factor is used for characterizing the maximum value of the standard power factor in the standard power factor interval;

when the actual power factor is detected to be smaller than a second target power factor, controlling the compensation device to execute the input operation of compensation capacity; wherein the second target power factor is used for characterizing the minimum value of the standard power factors in the standard power factor interval;

and when the actual power factor is detected to be within the standard power factor interval, the switching state of the compensation device in the target power utilization system is not changed.

In an alternative embodiment, the controlling the compensating device to perform a compensating volume cut-off operation includes:

determining, from the compensation device, a first compensation capacity that the compensation device has currently been committed in the target electrical system;

taking unit compensation capacity as a prediction step length for carrying out stepped removal on the first compensation capacity, and carrying out stepped prediction on the current power factor in the target power utilization system according to the reactive power demand and the electric signal sampling angle deviation after removing one unit compensation capacity in the target power utilization system under the condition that one unit compensation capacity is removed in the first compensation capacity, so as to obtain a first prediction result of the power factor under each stepped prediction; the electrical signal sampling angle deviation is used for representing the phase deviation of the voltage signal and the current signal in the target electrical signal sequence, which is generated due to sampling time delay;

and when the first prediction result is detected to be within the standard power factor interval, ending the step of step-type prediction, and controlling the compensation device to cut off unit compensation capacity under a first quantity in the first prediction result from the target power utilization system.

In an alternative embodiment, the controlling the compensating device to perform a commissioning operation of the compensating capacity includes:

determining, from the compensation device, a second compensation capacity that the compensation device is not invested in the target power consumption system;

step-by-step prediction step length is carried out by taking unit compensation capacity as the second compensation capacity, and under the condition that one unit compensation capacity is put into the target power utilization system every time, the power factor in the target power utilization system is subjected to step-by-step prediction according to the reactive power demand and the electric signal sampling angle deviation after one unit compensation capacity is put into the target power utilization system every time, so that a second prediction result of the power factor under each step-by-step prediction is obtained;

and ending the step-type prediction when the second prediction result is detected to be within the standard power factor interval, and controlling the compensation device to input unit compensation capacity under a second quantity in the second prediction result into the target power utilization system.

In an alternative embodiment, before the controlling the compensating device to perform the commissioning of the compensating capacity, the controlling method further includes:

calculating a first reactive power demand of the target power utilization system in the complete detection period according to a calculation strategy which is the same as the actual power factor;

judging whether the ratio of the first reactive power demand to a target investment coefficient is larger than or equal to idle compensation capacity which is not invested in the compensation device or not; the target input coefficient is used for representing a compensation proportion of the compensation device for providing compensation for reactive power consumed in the target power utilization system; the value of the target input coefficient is in an incidence relation with the interval size of the standard power factor interval;

and when detecting that the ratio of the first reactive power demand to the target investment coefficient is larger than or equal to the idle compensation capacity, controlling the compensation device to execute investment operation of compensation capacity.

In an alternative embodiment, when the control device performs the operation of cutting off the compensation capacity, the reactive power demand of the target power system after the change of the compensation capacity is calculated by the following method:

determining, by the compensation device, a first compensation capacity difference before and after a change in compensation capacity put into the target power consumption system when the control unit controls the compensation device to perform a removal operation of the compensation capacity;

and calculating the sum of the first reactive power demand and the first compensation capacity difference, and taking the calculation result as the reactive power demand of the target power utilization system after the compensation capacity is changed.

In an alternative embodiment, when the control device performs the operation of putting the compensation capacity into operation, the reactive power demand of the target power system after the change of the compensation capacity is calculated by the following method:

determining, by the compensation device, a second compensation capacity difference before and after a change in compensation capacity put into the target power consumption system when the control of the compensation device performs the operation of putting the compensation capacity into operation;

calculating a coefficient difference value between the target input coefficient and a coefficient 1, and taking the product of the coefficient difference value and unit compensation capacity as a capacity return difference value of the target input coefficient; the coefficient 1 is used for representing that the compensation device provides proportional compensation service for reactive power consumed in the target power utilization system;

and when the difference between the first reactive power demand and the second compensation capacity difference is larger than or equal to the capacity return difference of the target input coefficient, taking the difference between the first reactive power demand and the second compensation capacity difference as the reactive power demand of the target power utilization system after the compensation capacity is changed.

In a second aspect, the embodiment of the present application provides a control device for fast reactive power compensation, where the control device is applied to a target controller, where the target controller is used to control a compensation device to provide a reactive power compensation service for a target power utilization system; the control device includes:

the sampling module is used for collecting three-phase electric signals in the target power utilization system according to a preset sampling frequency to obtain a three-phase electric signal sequence; the three-phase electric signals are used for representing each corresponding voltage signal and current signal in three phases;

the analog-to-digital conversion module is used for selecting one phase of electric signal sequence from the three-phase electric signal sequence as a target electric signal sequence and using an analog-to-digital conversion result of the target electric signal sequence as basic control data of the compensation device;

the first control module is used for calculating a first power factor under the current half detection period by using the basic control data acquired in the current half detection period in the process that the compensation device provides reactive compensation service for the target power utilization system; the period length of the complete detection period is determined according to the power utilization frequency of the target power utilization system;

the second control module is used for acquiring a second power factor in the last half detection period, and taking the accumulated result of the first power factor and the second power factor as the actual power factor in the complete detection period; wherein the last half detection period and the current half detection period form one complete detection period;

and the third control module is used for judging whether the actual power factor is positioned in a standard power factor interval of the target power utilization system or not so as to control the switching state of the compensation device in the target power utilization system according to a judgment result.

In a third aspect, an embodiment of the present application provides a computer device, which includes a memory, a processor, and a computer program stored on the memory and executable on the processor, where the processor implements the steps of the control method when executing the computer program.

In a fourth aspect, the present application provides a computer-readable storage medium, on which a computer program is stored, where the computer program is executed by a processor to execute the steps of the control method.

The technical scheme provided by the embodiment of the application can have the following beneficial effects:

according to the control method, the device, the equipment and the storage medium for the rapid reactive compensation, the three-phase electric signals in the target power utilization system are collected according to the preset sampling frequency, and a three-phase electric signal sequence is obtained; selecting one phase electric signal sequence from the three-phase electric signal sequences as a target electric signal sequence, and using an analog-to-digital conversion result of the target electric signal sequence as basic control data of the compensation device; in the process that the compensation device provides reactive compensation service for a target power utilization system, basic control data collected in the current half detection period are utilized to calculate a first power factor in the current half detection period; acquiring a second power factor in the last half detection period, and taking the accumulated result of the first power factor and the second power factor as an actual power factor in the complete detection period; and judging whether the actual power factor is within a standard power factor interval of the target power utilization system or not, and controlling the switching state of the compensation device in the target power utilization system according to a judgment result.

Based on the control method, the response time of the compensation device can be shortened by a half-wave detection mode, and control errors caused by asymmetrical upper and lower waves of a system waveform and offset of a neutral line can be avoided, so that the speed and the precision of reactive compensation on a target power utilization system are improved, and the requirement of rapid reactive compensation of the target power utilization system is met.

In order to make the aforementioned objects, features and advantages of the present application more comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.

Fig. 1 is a schematic flow chart illustrating a control method for fast reactive compensation according to an embodiment of the present application;

fig. 2 is a schematic flowchart illustrating a method for controlling a switching state of a compensation device according to a determination result according to an embodiment of the present application;

FIG. 3 is a flow chart illustrating a method for controlling a compensation device to perform a compensation capacity cut-off operation according to an embodiment of the present disclosure;

FIG. 4 is a flow chart illustrating a method for controlling a compensation device to perform a compensation capacity commissioning operation according to an embodiment of the present application;

FIG. 5 is a flow chart illustrating a method for determining whether a commissioning operation can be performed according to an embodiment of the present disclosure;

fig. 6 shows a schematic structural diagram of a control device for fast reactive compensation provided by an embodiment of the present application;

fig. 7 is a schematic structural diagram of a computer device 700 according to an embodiment of the present application.

Detailed Description

In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it should be understood that the drawings in the present application are for illustrative and descriptive purposes only and are not used to limit the scope of protection of the present application. Additionally, it should be understood that the schematic drawings are not necessarily drawn to scale. The flowcharts used in this application illustrate operations implemented according to some embodiments of the present application. It should be understood that the operations of the flow diagrams may be performed out of order, and steps without logical context may be performed in reverse order or simultaneously. One skilled in the art, under the guidance of this application, may add one or more other operations to, or remove one or more operations from, the flowchart.

In addition, the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present application without making any creative effort, shall fall within the protection scope of the present application.

It should be noted that in the embodiments of the present application, the term "comprising" is used to indicate the presence of the features stated hereinafter, but does not exclude the addition of further features.

Based on this, the embodiment of the application provides a control method, a device, equipment and a storage medium for fast reactive compensation, and the three-phase electric signals in a target power utilization system are collected according to a preset sampling frequency to obtain a three-phase electric signal sequence; selecting one phase electric signal sequence from the three-phase electric signal sequences as a target electric signal sequence, and using an analog-to-digital conversion result of the target electric signal sequence as basic control data of the compensation device; in the process that the compensation device provides reactive compensation service for a target power utilization system, basic control data collected in the current half detection period are utilized to calculate a first power factor in the current half detection period; acquiring a second power factor in the last half detection period, and taking the accumulated result of the first power factor and the second power factor as an actual power factor in the complete detection period; and judging whether the actual power factor is within a standard power factor interval of the target power utilization system or not, and controlling the switching state of the compensation device in the target power utilization system according to a judgment result.

The following describes a control method, an apparatus, a device, and a storage medium for fast reactive power compensation provided in an embodiment of the present application in detail.

Referring to fig. 1, fig. 1 is a schematic flowchart illustrating a control method for fast reactive power compensation provided by an embodiment of the present application, where the control method is applied to a target controller, where the target controller is used to control a compensation device to provide reactive power compensation service for a target power consumption system; the control method includes steps S101-S105; specifically, the method comprises the following steps:

s101, collecting three-phase electric signals in the target power utilization system according to a preset sampling frequency to obtain a three-phase electric signal sequence.

In the embodiment of the present application, the target power utilization system is used to characterize a power utilization topology network composed of a plurality of power utilization devices used by a target enterprise in actual operation production, for example: a production power system a1 of the iron and steel enterprise a, a production power system b1 of the automobile enterprise b, and the like; the embodiment of the present application is not limited to a specific target enterprise type corresponding to a target power utilization system.

In the embodiment of the application, the compensation device is used for a capacitor bank with a switching switch, which is characterized by providing reactive compensation service for the target power utilization system.

Specifically, in the embodiment of the present application, the switch in the compensation device may be a thyristor switch (i.e., there is no electrical contact, and a semiconductor device is used instead of a traditional electrical contact switch).

Specifically, in actual industrial operation, most ac electric devices in the target electric system usually use three-phase ac power, and considering that each phase of ac power corresponds to a set of voltage signals and current signals, in step S101, the three-phase power signals are used to represent each corresponding voltage signal and current signal in three phases.

S102, selecting one phase electric signal sequence from the three-phase electric signal sequences as a target electric signal sequence, and using the analog-to-digital conversion result of the target electric signal sequence as basic control data of the compensation device.

Specifically, in an optional embodiment, the target controller may adopt a Digital signal processor DSP (Digital signal processing) developed by a TI texas instrument, a 12-bit Analog-to-Digital Converter ADC (Analog-to-Digital Converter) built in a C2000 series chip, and first, according to a preset sampling frequency (for example, a sampling frequency of 3.2 khz), the three-phase voltage and current signals in the target power consumption system are collected in real time to obtain an a-phase electrical signal sequence:

and B phase electrical signal sequence:

c-phase electrical signal sequence:

(ii) a Then, selecting one phase electric signal sequence as a target electric signal sequence (for example, using the B phase electric signal sequence as a target electric signal sequence); the ADC is used for carrying out analog-to-digital conversion on the target electric signal sequence, and the analog-to-digital conversion result is stored in a data buffer area of the target controller, so that the target controller can continuously acquire the target electric signal sequence and simultaneously carry out data calculation and processing on the acquired target electric signal sequence, and the work of realizing half-wave detection in the subsequent steps is realizedTechnical matting can be performed.

Specifically, in another optional embodiment, after the three-phase voltage and current signals in the target power utilization system are acquired in real time according to a preset sampling frequency to obtain the a-phase electric signal sequence, the B-phase electric signal sequence and the C-phase electric signal sequence, the three-phase electric signal sequence may be subjected to analog-to-digital conversion by using an analog-to-digital converter ADC to obtain analog-to-digital conversion results corresponding to the three-phase electric signal sequence; then, from the analog-to-digital conversion results corresponding to the three-phase electric signal sequences, an analog-to-digital conversion result corresponding to one-phase electric signal sequence (for example, the analog-to-digital conversion result of the B-phase electric signal sequence) is selected as the basic control data of the compensation device.

It should be noted that, based on the two alternative embodiments, in the embodiment of the present application, the implementation order between the "analog-to-digital conversion step" and the "selection step of the target electrical signal sequence" is not limited in any way.

It should be noted that, the one-phase electrical signal sequence is used as the target electrical signal sequence in step S102 only to shorten the response time of the compensation device as much as possible, and meanwhile, a two-phase current transformer can be omitted, so that the hardware resource and the material cost of the compensation device are saved; that is, it is also possible to use the three-phase electrical signal sequence as the target electrical signal sequence in step S102, and this is not limited in the embodiment of the present application.

And S103, calculating a first power factor in the current half detection period by using the basic control data acquired in the current half detection period in the process that the compensation device provides reactive compensation service for the target power utilization system.

Here, the period length of the complete detection period is determined according to the power frequency of the target power system, and taking the power frequency 50 hz (i.e. 50 voltage changes per second) commonly used by domestic power grids as an example, the period length of the complete detection period is 20 ms (i.e. 20 ms)

Seconds).

In the embodiment of the present application

Representing the number of electrical signals collected during the current half detection period (i.e., 10 ms), the first power factor under the current half detection period can be calculated by the following formula

Specifically, the method comprises the following steps:

；

；

；

wherein the content of the first and second substances,

representing the analog-to-digital conversion result of a voltage signal sequence in a target electric signal sequence acquired in the current half detection period;

representing the analog-to-digital conversion result of a current signal sequence in a target electric signal sequence acquired in the current half detection period;

representing the active power of the target power utilization system in the current half detection period;

representing the reactive power of the target power utilization system in the current half detection periodAnd (4) power.

It should be noted that, taking the sampling frequency preset in step S101 as 3.2 khz as an example, the number N of electrical signals that can be acquired within 20 ms of a complete detection period is 64 (i.e., 3.2 khz/50 hz = 64/period).

And S104, acquiring a second power factor in the last half detection period, and taking the accumulated result of the first power factor and the second power factor as the actual power factor in the complete detection period.

Here, the first half detection period and the current half detection period form one complete detection period, that is, taking a complete detection period of 20 ms as an example, the first half detection period is the first 10 ms of a complete detection period, and the current half detection period is the last 10 ms of a complete detection period.

Specifically, the calculation method of the second power factor is the same as the calculation method of the first power factor in step S104, and repeated parts are not described herein again.

It should be noted that the step S103 and the step S104 are implemented in a segmented manner, which is essentially equivalent to splitting the whole wave (i.e. the complete voltage waveform and the complete current waveform) data in the original complete detection period into 2 half-wave detection data for calculating the power factor according to the half detection period. Therefore, compared with a mode of calculating according to whole wave data in the prior art, on one hand, synchronous implementation of data acquisition and data processing can be realized according to half waves as units, waiting time between the data processing and the data acquisition is saved (namely, at least one complete detection period needs to be waited between the data processing and the data acquisition in the prior art), and the response time of the compensation device is favorably shortened, so that the speed and the efficiency of reactive compensation on a target power utilization system are improved, and the requirement of rapid reactive compensation of the target power utilization system is met; on the other hand, in the actual engineering, the waveform distortion is caused by the influence of the harmonic wave, and even the extreme case of asymmetric upper and lower waves may occur, so that the bit line in the waveform may be shifted in the actual engineering, and a data processing error may occur; in the half-wave detection mode in the embodiment of the application, even if the waveform is not completely symmetrical, the problem of the offset of the neutral line cannot be caused, and further, the control error caused by the asymmetry of the upper and lower waves of the system waveform and the offset of the neutral line can be avoided, so that the control on the compensation device is more stable and accurate.

And S105, judging whether the actual power factor is within a standard power factor interval of the target power utilization system, and controlling the switching state of the compensation device in the target power utilization system according to a judgment result.

Here, the standard power factor interval is used for representing a standard interval range in which the power factor of the target power utilization system does not need to be compensated; the specific interval value and the specific interval length of the standard power factor interval can be adjusted according to the actual compensation requirement of the target power utilization system, and the embodiment of the application is not limited at all. In an alternative implementation, as shown in fig. 2, fig. 2 is a schematic flow chart illustrating a method for controlling a switching state of a compensation device according to a determination result, provided by an embodiment of the present application, where, when step S105 is executed, the method includes steps S201 to S203; specifically, the method comprises the following steps:

s201, when the actual power factor is detected to be larger than a first target power factor or the actual power factor is detected to be a negative number, controlling the compensation device to execute the removal operation of the compensation capacity.

Here, the first target power factor is used to characterize a maximum value of the standard power factor in the standard power factor interval; if the actual power factor is a negative number, the reactive power in the current target power utilization system is represented to be capacitive, namely, the compensation capacity in the current target power utilization system is excessive; at this time, it is necessary to control the compensation device to cut off the compensation capacity that has been already put into the current target power system, so that the power factor in the target power system is restored to be within the standard power factor interval after the excess compensation capacity is cut off.

And S202, controlling the compensation device to carry out the operation of putting the compensation capacity into operation when the actual power factor is detected to be smaller than a second target power factor.

Here, the second target power factor is used to represent a minimum value of the standard power factor in the standard power factor interval, that is, a phenomenon that a compensation capacity in the current target power utilization system is insufficient; at this time, it is necessary to control the compensation device to put the partial compensation capacity into the current target power consumption system again so that the power factor in the target power consumption system is restored to within the standard power factor range after the partial compensation capacity is put into operation.

S203, when the actual power factor is detected to be within the standard power factor range, the switching state of the compensation device in the target power utilization system is not changed.

At this time, when the actual power factor is within the standard power factor interval, it may be determined that the power factor in the current target power utilization system does not need to be compensated, that is, neither the removal operation nor the input operation needs to be performed, and only the next determination result needs to be waited.

In the embodiment of the present application, for the specific implementation process of the foregoing steps S201 to S202, in an optional embodiment, the compensation device may perform step-type reactive compensation on the target power system according to a preset unit compensation capacity.

Illustratively, taking a unit compensation capacity of 100kvar (kilo VAR, a unit of capacity commonly used as a reactive power compensation device) as an example, a compensation capacity output list is stored in the compensation device in advance, wherein, as shown in table 1 below, the compensation capacity output list describes a compensation capacity index corresponding to each gradient in the compensation device, and a stepped output combination of compensation capacities at different gradients; specifically, the method comprises the following steps:

table 1 list of compensated capacity outputs:

at this time, taking table 1 as an example, when it is detected that the actual power factor is higher than the standard power factor interval, the target controller may control the compensation device to perform step-wise removal of the currently-input compensation capacity in the target power system according to the compensation capacity output list shown in table 1, with 100kvar as the unit compensation capacity; when the actual power factor is detected to be lower than the standard power factor interval, the target controller may control the compensation device to perform stepped input on the currently-input compensation capacity in the target power utilization system according to the compensation capacity output list shown in table 1, with 100kvar as the unit compensation capacity.

Based on the above stepped reactive compensation method, the following detailed descriptions are respectively made for the specific implementation processes of the above steps S201 to S202 in the embodiment of the present application:

in an alternative embodiment, as shown in fig. 3, fig. 3 is a flow chart illustrating a method for controlling a compensation device to perform a compensation capacity cutting operation according to an embodiment of the present application, wherein, when step S201 is performed, the method includes steps S301 to S303; specifically, the method comprises the following steps:

s301, determining a first compensation capacity currently charged in the target power system by the compensation device from the compensation device.

In an exemplary description, taking the output list of compensation capacities shown in table 1 as an example, the "stepwise output combination of compensation capacities" currently used by the compensation device is obtained from the compensation device, and if the "stepwise output combination of compensation capacities" currently used by the compensation device is obtained, the following steps are performed: c1 × 3; determining that the first compensation capacity which is currently put into the target power utilization system by the compensation device is as follows: 3 capacitor combinations with a capacity of 100 kvar.

And S302, taking unit compensation capacity as a prediction step length for carrying out stepped removal on the first compensation capacity, and carrying out stepped prediction on the current power factor in the target power utilization system according to the reactive power demand and the electric signal sampling angle deviation after removing one unit compensation capacity in the target power utilization system under the condition that one unit compensation capacity is removed in the first compensation capacity, so as to obtain a first prediction result of the power factor under each stepped prediction.

Here, the electrical signal sampling angle deviation is used to characterize a phase deviation of the voltage signal and the current signal in the target electrical signal sequence due to a sampling time delay.

Here, after determining that the control of the compensation device to perform the cut-out operation, specifically, since the execution of the cut-out operation may cause the compensation capacity put into the target power system to decrease, based on this, when the control of the compensation device to perform the cut-out operation of the compensation capacity, that is, when the compensation capacity put into the target power system decreases, step S302 may calculate the reactive power demand of the target power system after the compensation capacity is changed by:

step 1, when the compensation device is controlled to execute the removal operation of the compensation capacity, determining a first compensation capacity difference value before and after the change of the compensation capacity input into the target power utilization system through the compensation device.

And 2, calculating a sum of the difference between the first reactive power demand and the first compensation capacity, and taking a calculation result as the reactive power demand of the target power utilization system after the compensation capacity is changed (namely reduced).

Specifically, for the implementation of the above steps 1 and 2, the capacitance value of the unit compensation capacity is used as the capacitance value

For example, the reactive power demand after cutting off one unit of compensation capacity in the target power system

The calculation can be made according to the following formula:

；

；

；

wherein the content of the first and second substances,

the method is used for representing the reactive power of the target power utilization system in the last half detection period;

the method is used for representing the reactive power of a target power utilization system in the current half detection period;

the method is used for representing the reactive power of the target power utilization system in the current complete detection period, namely for representing the removal of one unit compensation capacity in the target power utilization system

Previous reactive power demand;

for characterizing the compensated capacity due to the removal of one unit

And the reactive power variation amount causes the reactive power in the target power utilization system to vary;

method for cutting off one unit of compensation capacity in target power utilization system

The subsequent reactive power demand.

Here, for

Need to make sure thatThe first compensation capacity difference represents a difference between the compensation capacity after the compensation capacity put into the target power consumption system has occurred and the compensation capacity before the compensation capacity has changed, and therefore, the first compensation capacity difference is based on the unit compensation capacity

When the stepwise prediction is performed, the first compensation capacity difference is equivalent to the number of stepwise predictions and the unit compensation capacity

The product of (a) such as: first stepwise prediction (i.e. cutting off one unit of compensation capacity)

) First compensation capacity difference before and after the change of compensation capacity put into the target power consumption system

In the second stepwise prediction, the first compensation capacity difference before and after the change of the compensation capacity put into the target power consumption system

。

In addition, the above description is given

And

and the above step S103

The same, the repetition is not repeated herein.

Specifically, one unit of compensation capacity is cut off in the target power utilization system

After reactivePower demand

Then, the angle deviation of the electrical signal sampling in the current complete detection period can be continuously obtained

To obtain the removal of one unit of compensation capacity

Then, the predicted value of the power factor in the target power utilization system is as follows:

；

；

wherein the content of the first and second substances,

the active power detection method is used for representing the active power of the target power utilization system in the last half detection period;

the active power of the target power utilization system in the current half detection period is represented;

the method is used for representing the active power of the target power utilization system in the current complete detection period, namely for representing the removal of one unit of compensation capacity in the target power utilization system

The previous active power;

the method is used for representing the sampling angle deviation of the electric signal in the current complete detection period;

for characterizing the removal of one unit of compensation volume

And then, predicting the power factor in the target power utilization system.

It should be noted that the unit compensation capacity

Whether to switch or not does not change the active power in the target power utilization system

、

And

。

in addition, the above description is given

And

and the above step S103

The same, the repetition is not repeated herein.

And S303, when the first prediction result is detected to be located in the standard power factor interval, ending the step of step-type prediction, and controlling the compensation device to cut off the unit compensation capacity of the first prediction result under the first quantity from the target power utilization system.

By way of example, and also taking the above example as an example, the first compensation capacity currently put into the target power system by the compensation device is: 3 capacitor combinations with a capacity of 100kvar, the capacity is compensated in units of 100kvar as the predicted step size of the stepwise cut-off (i.e., the predicted step size of the stepwise cut-off) according to the embodiment of step S302 above

=100 kvar), under the condition that one 100kvar unit compensation capacity is cut from the first compensation capacity, the reactive power demand (i.e. the reactive power demand after one unit compensation capacity is cut from the target power system) is determined according to the amount of the reactive power demand

Calculated when =100kvar

) And electrical signal sampling angle deviation

And carrying out step-type prediction on the power factor in the current target power utilization system to obtain a first prediction result of the power factor under the first step-type prediction

(ii) a If the first prediction result is detected

And if the first prediction result is within the standard power factor interval, determining that the first quantity in the first prediction result is 1 unit of compensation capacity, namely, controlling the compensation device to cut 1 capacitor of 100kvar from 3 capacitors of 100kvar already put into the target power utilization system.

In an alternative embodiment, as shown in fig. 4, fig. 4 is a flow chart illustrating a method for controlling a compensation device to perform a commissioning operation of compensating capacity according to an embodiment of the present application, wherein, when performing step S202, the method includes steps S401-S403; specifically, the method comprises the following steps:

s401, determining a second compensation capacity, which is not input into the target power consumption system, from the compensation device.

For example, according to the embodiment of step S301, if it is determined that the first compensation capacity currently charged by the compensation device in the target power utilization system is: 3 capacitor combinations with the capacity of 100kvar can determine that all the capacitors in the compensation device except the 3 capacitor combinations with the capacity of 100kvar are the second compensation capacity which is not put into the target power utilization system by the compensation device.

S402, taking unit compensation capacity as the second compensation capacity to carry out step-type input prediction step length, and carrying out step-type prediction on the current power factor in the target power system according to the reactive power demand and the electric signal sampling angle deviation after one unit compensation capacity is input in the target power system under the condition that one unit compensation capacity is input in the target power system, so as to obtain a second prediction result of the power factor under each step-type prediction.

Here, considering that the demand of the target power system for reactive power compensation may be different in different industrial application scenarios, for example, some target enterprises may desire how much reactive power demand in the target power system and how much the control compensation device compensates for compensation capacity in the target power system; however, some target enterprises allow the reactive power demand in the target power system to be more than the compensation capacity of the compensation device in the target power system (i.e., allow a certain amount of reactive power to be reserved in the target power system).

Based on the implementation of the step S302 and the step S402, in the embodiment of the present application, no matter what the determination result in the step S105 is, the method is essentially equivalent to a "pre-switching" method, that is, before the actual control compensation device performs the input/cut-off operation of the capacitor, the result after the input/cut-off (i.e., the power factor in the target power system) is predicted, and compared with the prior art in which the control method for determining the actual power factor after the input/cut-off operation is performed first, the embodiment of the present application adopts the "pre-switching" method, so that at least the following beneficial effects can be achieved, specifically:

(1) the compensation device can be controlled to realize accurate compensation, and the compensation device can be put in place in one step, so that repeated switching is avoided;

(2) switching times can be reduced, and the service life of a power device is prolonged;

(3) and adverse effects on the safety and stability of the target power utilization system due to frequent switching impact on the target power utilization system are avoided.

Based on this, in an alternative embodiment, as shown in fig. 5, fig. 5 is a flowchart illustrating a method for determining whether a commissioning operation can be performed according to an embodiment of the present application, wherein, when step S402 is performed, before controlling the compensation device to perform the commissioning operation of the compensation capacity, the control method includes steps S501 to S503; specifically, the method comprises the following steps:

s501, calculating a first reactive power demand of the target power utilization system in the complete detection period according to a calculation strategy which is the same as the actual power factor.

Specifically, the method for calculating the first reactive power requirement in step S501 and the method in step S302

The same, the repetition is not repeated herein.

And S502, judging whether the ratio of the first reactive power demand to a target investment coefficient is larger than or equal to the idle compensation capacity which is not invested in the compensation device.

Here, the target input coefficient is used to represent a compensation proportion of the compensation device for providing compensation for the reactive power consumed in the target power utilization system, that is, a value range of the target input coefficient is greater than or equal to 1; when the target input coefficient value is 1, the target input coefficient value indicates that the target enterprise expects the reactive power demand in the target power utilization system, and the control compensation device compensates the compensation capacity in the target power utilization system.

Specifically, the standard power factor interval is used for representing a standard interval range in which the power factor of the target power utilization system does not need to be compensated; moreover, similar to the target input coefficient, the specific interval value and the specific interval length of the standard power factor interval may also be adjusted according to the actual compensation requirement of the target power utilization system, so in the embodiment of the present application, there is an association relationship between the value of the target input coefficient and the interval size of the standard power factor interval.

It should be noted that the association does not represent a specific formula conversion class relationship, for example, the association may also be simply represented as: when the interval length of the standard power factor interval is larger, the specific value of the target input coefficient is also larger.

And S503, when the ratio of the first reactive power demand to the target input coefficient is detected to be larger than or equal to the idle compensation capacity, controlling the compensation device to execute input operation of compensation capacity.

In this case, if it is detected that the ratio of the first reactive power demand to the target input coefficient is greater than or equal to the idle compensation capacity, the idle compensation capacity remaining in the compensation device indicates that the reactive power in the target power system can be supplemented to the extent desired by the user (i.e., within the standard power factor interval), and the compensation device may be controlled to perform the input operation of the compensation capacity.

And S403, when the second prediction result is detected to be within the standard power factor interval, ending the step of step-type prediction, and controlling the compensation device to input unit compensation capacity with a second quantity in the second prediction result into the target power utilization system.

Here, after it is determined that the control of the compensation device to perform the commissioning operation increases the compensation capacity to be commissioned in the target power system due to the commissioning operation, based on which, when the compensation device is controlled to perform the commissioning operation of the compensation capacity, that is, when the compensation capacity to be commissioned in the target power system increases, unlike step S302, with respect to the specific implementation process of the above-described steps S402 to S403, the reactive power demand amount of the target power system after the compensation capacity changes can be calculated by:

and a step a of determining a second compensation capacity difference before and after the change of the compensation capacity put into the target power consumption system by the compensation device when the compensation device is controlled to carry out the putting operation of the compensation capacity.

Specifically, for the specific implementation of the step a, the compensation capacity put into the target power utilization system is the unit compensation capacity

For example, the second compensation capacity difference before and after the change of the compensation capacity put into the target power consumption system

。

The second compensation capacity difference represents a difference between the compensation capacity after the generation of the compensation capacity put into the target power consumption system and the compensation capacity before the change, and is therefore based on the unit compensation capacity

When the stepwise prediction is performed, the second compensation capacity difference is equivalent to the number of stepwise predictions and the unit compensation capacity

The product of (a) such as: in the first stepwise prediction, a second compensation capacity difference before and after a change in compensation capacity put into the target power consumption system

And a second compensation capacity difference before and after the change of the compensation capacity inputted to the target power consumption system in the second stepwise prediction

。

And b, calculating a coefficient difference value between the target input coefficient and a coefficient 1, and taking the product of the coefficient difference value and the unit compensation capacity as a capacity return difference value of the target input coefficient.

Here, the value range of the target input coefficient is greater than or equal to a coefficient 1; the coefficient 1 is used for representing that the compensation device provides proportional compensation service for reactive power consumed in the target power utilization system; the specific value of the target input coefficient can be determined according to the actual reactive compensation requirement in the target power utilization system.

Exemplary illustrations of the target input coefficients are

For example, the value of the capacity back-off of the target input coefficient

。

And c, when the difference between the first reactive power demand and the second compensation capacity difference is larger than or equal to the capacity return difference of the target input coefficient, taking the difference between the first reactive power demand and the second compensation capacity difference as the reactive power demand of the target power system after the compensation capacity is changed (namely increased).

Here, the first reactive power demand amount calculation method and the above-mentioned step S302

The same, the repetition is not repeated herein.

Specifically, the first reactive power demand is

The compensation capacity put into the target power system is a unit compensation capacity

For example, the first lost workThe difference between the rate demand and the second compensated capacity difference is:

；

when detecting that

Capacity back-off value of not less than target input coefficient

When, i.e. when, detecting

When the idle compensation capacity is not less than 0, the idle compensation capacity which is not input by the current compensation device is enough to meet the reactive compensation requirement of the target power utilization system; in this case, the reactive power demand of the target power system after the compensation capacity is increased

(corresponding to a reduction in the need for reactive power compensation in the target power system after the compensation capacity has been placed).

Specifically, one unit of compensation capacity is put into the target power utilization system

Subsequent reactive power demand

To obtain the input of one unit compensation capacity

；

；

wherein the content of the first and second substances,

the method is used for representing the active power of the target power utilization system in the current complete detection period, namely, the method is used for representing the unit compensation capacity put into the target power utilization system

The previous active power;

for characterizing the input one unit compensation capacity

And then, predicting the power factor in the target power utilization system.

It should be noted that the unit compensation capacity

、

And

。

in addition, the above description is given

And

and the above step S103

The same, the repetition is not repeated herein.

According to the control method provided by the embodiment of the application, the three-phase electric signals in the target power utilization system are collected according to the preset sampling frequency, and a three-phase electric signal sequence is obtained; selecting one phase electric signal sequence from the three-phase electric signal sequences as a target electric signal sequence, and using an analog-to-digital conversion result of the target electric signal sequence as basic control data of the compensation device; in the process that the compensation device provides reactive compensation service for a target power utilization system, basic control data collected in the current half detection period are utilized to calculate a first power factor in the current half detection period; acquiring a second power factor in the last half detection period, and taking the accumulated result of the first power factor and the second power factor as an actual power factor in the complete detection period; and judging whether the actual power factor is within a standard power factor interval of the target power utilization system or not, and controlling the switching state of the compensation device in the target power utilization system according to a judgment result.

Based on the same inventive concept, a control device corresponding to the control method for fast reactive power compensation in the foregoing embodiment is also provided in the embodiment of the present application, and since the principle of solving the problem of the control device in the embodiment of the present application is similar to that of the control method in the foregoing embodiment of the present application, the implementation of the control device may refer to the implementation of the foregoing control method, and repeated details are omitted.

Referring to fig. 6, fig. 6 is a schematic structural diagram illustrating a control apparatus for fast reactive power compensation according to an embodiment of the present application; the control device is applied to a target controller, wherein the target controller is used for controlling a compensation device to provide reactive compensation service for a target power utilization system; the control device includes:

the sampling module 601 is configured to collect three-phase electrical signals in the target power consumption system according to a preset sampling frequency to obtain a three-phase electrical signal sequence; the three-phase electric signals are used for representing each corresponding voltage signal and current signal in three phases;

an analog-to-digital conversion module 602, configured to select one of the three-phase electrical signal sequences as a target electrical signal sequence, and use an analog-to-digital conversion result of the target electrical signal sequence as basic control data of the compensation device;

a first control module 603, configured to calculate a first power factor in a current half detection period by using the basic control data acquired in the current half detection period in a process in which the compensation device provides a reactive compensation service for the target power utilization system; the period length of the complete detection period is determined according to the power utilization frequency of the target power utilization system;

a second control module 604, configured to obtain a second power factor in a last half of a detection period, and use an accumulated result of the first power factor and the second power factor as an actual power factor in the complete detection period; wherein the last half detection period and the current half detection period form one complete detection period;

and a third control module 605, configured to determine whether the actual power factor is within a standard power factor range of the target power utilization system, so as to control a switching state of the compensation device in the target power utilization system according to a determination result.

In an optional implementation manner, when the switching state of the compensation device in the target power utilization system is controlled according to the determination result, the third control module 605 is configured to:

In an alternative embodiment, when the control device performs the compensation capacity cutting operation, the third control module 605 is configured to:

In an alternative embodiment, when the controlling the compensating device performs the commissioning of the compensating capacity, the third control module 605 is configured to:

In an alternative embodiment, before the controlling the compensating device to perform the commissioning of the compensating capacity, the third control module 605 is further configured to:

In an alternative embodiment, when the control device performs the compensation capacity cutting operation, the third control module 605 is configured to calculate the reactive power demand of the target power system after the compensation capacity is changed by the following method:

In an alternative embodiment, when the control device performs the operation of putting the compensation capacity into operation, the third control module 605 is configured to calculate the reactive power demand of the target power system after the compensation capacity is changed by the following method:

As shown in fig. 7, an embodiment of the present application provides a computer device 700 for executing the control method for fast reactive power compensation in the present application, the device includes a memory 701, a processor 702, and a computer program stored in the memory 701 and executable on the processor 702, wherein the processor 702 implements the steps of the control method for fast reactive power compensation when executing the computer program.

Specifically, the memory 701 and the processor 702 may be general-purpose memory and processor, and are not limited in particular, and when the processor 702 runs a computer program stored in the memory 701, the control method for fast reactive power compensation can be executed.

Corresponding to the control method for fast reactive power compensation in the present application, an embodiment of the present application further provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and the computer program, when executed by a processor, performs the steps of the control method for fast reactive power compensation.

In particular, the storage medium can be a general-purpose storage medium, such as a removable disk, a hard disk, or the like, and when a computer program on the storage medium is executed, the control method for fast reactive power compensation can be executed.

In the embodiments provided in the present application, it should be understood that the disclosed system and method may be implemented in other ways. The above-described system embodiments are merely illustrative, and for example, the division of the units is only one logical functional division, and there may be other divisions in actual implementation, and for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection of systems or units through some communication interfaces, and may be in an electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, functional units in the embodiments provided in the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.

The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application or portions thereof that substantially contribute to the prior art may be embodied in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus once an item is defined in one figure, it need not be further defined and explained in subsequent figures, and moreover, the terms "first", "second", "third", etc. are used merely to distinguish one description from another and are not to be construed as indicating or implying relative importance.

Finally, it should be noted that: the above-mentioned embodiments are only specific embodiments of the present application, and are used for illustrating the technical solutions of the present application, but not limiting the same, and the scope of the present application is not limited thereto, and although the present application is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope disclosed in the present application; such modifications, changes or substitutions do not depart from the spirit and scope of the present disclosure, which should be construed in light of the above teachings. Are intended to be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. The control method of the rapid reactive power compensation is applied to a target controller, wherein the target controller is used for controlling a compensation device to provide reactive power compensation service for a target power utilization system; the control method comprises the following steps:

2. The control method according to claim 1, wherein the controlling the switching state of the compensation device in the target power utilization system according to the determination result comprises:

3. The control method according to claim 2, wherein the controlling the compensation device to perform a compensation capacity cut-off operation includes:

4. The control method according to claim 2, wherein the controlling the compensation device to perform a commissioning operation of compensating the capacity includes:

5. The control method according to claim 2, characterized in that before the control of the compensation device to perform a commissioning operation of compensating capacity, the control method further comprises:

6. The control method according to claim 5, wherein, when the control device performs the operation of cutting off the compensation capacity, the reactive power demand of the target power system after the change of the compensation capacity is calculated by:

7. The control method according to claim 5, wherein, when the control device performs the operation of putting the compensation capacity into operation, the reactive power demand of the target power system after the change in the compensation capacity is calculated by:

8. The control device for the rapid reactive power compensation is applied to a target controller, wherein the target controller is used for controlling the compensation device to provide reactive power compensation service for a target power utilization system; the control device includes:

9. An electronic device, comprising: a processor, a memory and a bus, the memory storing machine-readable instructions executable by the processor, the processor and the memory communicating over the bus when the electronic device is operating, the machine-readable instructions when executed by the processor performing the steps of the control method of any of claims 1 to 7.

10. A computer-readable storage medium, characterized in that a computer program is stored on the computer-readable storage medium, which computer program, when being executed by a processor, performs the steps of the control method according to one of claims 1 to 7.