CN112769142A - Voltage sag control method, device, control equipment and storage medium - Google Patents

Voltage sag control method, device, control equipment and storage medium Download PDF

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Publication number
CN112769142A
CN112769142A CN202011638370.XA CN202011638370A CN112769142A CN 112769142 A CN112769142 A CN 112769142A CN 202011638370 A CN202011638370 A CN 202011638370A CN 112769142 A CN112769142 A CN 112769142A
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voltage
compensation
sag
voltage sag
type
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Inventor
莫文雄
周凯
王勇
许中
马智远
郭倩雯
饶毅
栾乐
马捷然
罗林欢
孙奇珍
唐宗顺
杨帆
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Guangzhou Power Supply Bureau of Guangdong Power Grid Co Ltd
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Guangzhou Power Supply Bureau of Guangdong Power Grid Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
    • H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
    • H02J3/48—Controlling the sharing of the in-phase component
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
    • H02J3/50—Controlling the sharing of the out-of-phase component
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/30—Reactive power compensation

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

Abstract

The application relates to a voltage sag control method, a voltage sag control device and a storage medium. The method comprises the following steps: acquiring a first type parameter and a second type parameter of voltage sag in a power grid; determining a compensation voltage based on the first type of parameters, wherein the compensation voltage enables phasors between load current of a power grid and compensated output voltage to be vertical to each other; and controlling the voltage of the voltage sag to be compensated according to the compensation voltage and the second type of parameter. By adopting the method and the device, the voltage sag can be prevented from damaging the equipment, and the service life of the equipment is prolonged.

Description

Voltage sag control method, device, control equipment and storage medium
Technical Field
The present application relates to the field of power system technologies, and in particular, to a voltage sag control method, an apparatus, a control device, and a storage medium.
Background
In the operation process of the power system, transient power quality problems including sudden voltage rise, temporary voltage drop, short-time power failure and the like exist.
The voltage sag refers to a voltage drop, namely, an effective value of power frequency voltage at a certain point in the power system is temporarily reduced to 10% -90% of a rated voltage (namely, the amplitude is 0.1-0.9 (p.u.), and lasts for 10 ms-1 min, the system frequency is still a nominal value in the period, and then the system frequency is restored to a normal level.
Disclosure of Invention
In view of the above, it is necessary to provide a voltage sag control method, an apparatus, a control device, and a storage medium, which can avoid damage to a device due to voltage sag and prolong the service life of the device.
A voltage sag control method comprising:
acquiring a first type parameter and a second type parameter of voltage sag in a power grid;
determining a compensation voltage based on the first type of parameter, wherein the compensation voltage enables phasor between load current of the power grid and the compensated output voltage to be vertical to each other;
and controlling the voltage of the voltage sag to be compensated according to the compensation voltage and the second type of parameter.
In one embodiment, the first type of parameters include a load voltage before a voltage sag, a voltage sag depth, a phase change during voltage compensation, and a phase jump angle during the voltage sag;
the determining a compensation voltage based on the first class of parameters includes:
Figure BDA0002879229240000021
Figure BDA0002879229240000022
wherein U is the amplitude of the compensation voltage, theta is the phase angle of the compensation voltage, and UpThe load voltage before the voltage sag is obtained, delta U is the voltage sag depth, lambda is the phase change during voltage compensation, and beta is the phase jump angle during the voltage sag.
In one embodiment, after determining the compensation voltage based on the first type parameter, the method further includes:
and when the sag voltage of the power grid is in the same phase with the load current, determining the compensation voltage as a maximum compensation value.
In one embodiment, the determining that the compensation voltage is a maximum compensation value includes:
obtaining the system voltage after the voltage sag, the maximum depth of the voltage sag and the angle of a load power factor;
and calculating the maximum compensation value according to the system voltage after the voltage sag, the maximum depth of the voltage sag and the angle of the load power factor.
In one embodiment, the calculating the maximum compensation value according to the system voltage after the voltage sag, the maximum depth of the voltage sag, and the angle of the load power factor includes:
Figure BDA0002879229240000023
wherein, UmaxIs the maximum compensation value, URSystem voltage after voltage sag, Δ UmaxAnd alpha is the angle of the load power factor, which is the maximum depth of the voltage sag.
In one embodiment, the second type of parameters include a voltage amplitude before voltage sag, a voltage amplitude after voltage sag, a voltage sag occurrence time and a phase value; the controlling the voltage of the voltage sag to be compensated according to the compensation voltage and the second type of parameter includes:
calculating the difference value of the compensation voltage and the voltage of the voltage sag, and determining a modulation signal according to the difference value;
determining an abrupt change signal according to the voltage amplitude before the voltage sag, the voltage amplitude after the voltage sag, the voltage sag occurrence moment and the phase value;
determining a control signal according to the mutation signal and the modulation signal;
and controlling the voltage of the voltage sag to be compensated according to the control signal.
A voltage sag control device comprising:
the parameter acquisition module is used for acquiring a first type parameter and a second type parameter of voltage sag in a power grid;
the voltage determination module is used for determining a compensation voltage based on the first type of parameters, wherein the compensation voltage enables phasors between the load current of the power grid and the compensated output voltage to be vertical to each other;
and the voltage compensation module is used for controlling the compensation of the voltage sag according to the compensation voltage and the second type of parameter.
In one embodiment, the voltage sag control device further includes:
and the maximum value calculation module is used for determining the compensation voltage as a maximum compensation value when the sag voltage of the power grid is in the same phase with the load current after the voltage determination module determines the compensation voltage based on the first type of parameters.
A computer device comprising a memory and a processor, the memory storing a computer program, the processor implementing the following steps when executing the computer program:
acquiring a first type parameter and a second type parameter of voltage sag in a power grid;
determining a compensation voltage based on the first type of parameter, wherein the compensation voltage enables phasor between load current of the power grid and the compensated output voltage to be vertical to each other;
and controlling the voltage of the voltage sag to be compensated according to the compensation voltage and the second type of parameter.
A computer-readable storage medium, on which a computer program is stored which, when executed by a processor, carries out the steps of:
acquiring a first type parameter and a second type parameter of voltage sag in a power grid;
determining a compensation voltage based on the first type of parameter, wherein the compensation voltage enables phasor between load current of the power grid and the compensated output voltage to be vertical to each other;
and controlling the voltage of the voltage sag to be compensated according to the compensation voltage and the second type of parameter.
According to the voltage sag control method, the voltage sag control device, the control equipment and the storage medium, based on the first type of parameters and the second type of parameters related to voltage sag in the power grid, the compensation voltage is determined according to the first type of parameters, and voltage compensation is performed according to the compensation voltage and the second type of parameters, so that real-time compensation is performed on the voltage of the voltage sag, the influence of the voltage sag on the operation of the equipment is reduced, the damage of the voltage sag on the equipment is avoided, and the service life of the equipment is prolonged.
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In order to more clearly illustrate the technical solutions in the embodiments or the conventional technologies of the present application, the drawings used in the descriptions of the embodiments or the conventional technologies will be briefly introduced below, it is obvious that the drawings in the following descriptions are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flow diagram illustrating a voltage sag control method according to an embodiment;
FIG. 2 is a schematic diagram illustrating an embodiment of a process for compensating a voltage of a voltage sag based on a compensation voltage and a second type parameter;
fig. 3 is a block diagram of a voltage sag control device according to an embodiment.
Detailed Description
To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Embodiments of the present application are set forth in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
It will be understood that, as used herein, the terms "first," "second," and the like may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another.
It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or be connected to the other element through intervening elements. Further, "connection" in the following embodiments is understood to mean "electrical connection", "communication connection", or the like, if there is a transfer of electrical signals or data between the connected objects.
As used herein, the singular forms "a", "an" and "the" may include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises/comprising," "includes" or "including," etc., specify the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.
In one embodiment, as shown in fig. 1, there is provided a voltage sag control method, for example, the method is applied to a control device of a power grid, and the method includes:
s110: and acquiring a first type parameter and a second type parameter of voltage sag in the power grid.
The first type of parameter and the second type of parameter are related parameters in the power grid when a voltage sag occurs in the power grid, and may include various data. Specifically, the first type of parameter and the second type of parameter may be acquired by a parameter acquisition device and then transmitted to the control device, or may be acquired by other methods, for example, acquired by a user and then input to the control device through an input device.
S130: the compensation voltage is determined based on a first type of parameter.
The compensation voltage enables phasor between load current of the power grid and the compensated output voltage to be vertical to each other.
S150: and controlling the voltage of the voltage sag to be compensated according to the compensation voltage and the second type of parameter.
Specifically, the voltage compensation device may be controlled to inject voltage into the power grid for voltage compensation.
According to the voltage sag control method, based on the first type of parameters and the second type of parameters related to voltage sag in the power grid, the compensation voltage is determined according to the first type of parameters, and voltage compensation is performed according to the compensation voltage and the second type of parameters, so that real-time compensation is performed on the voltage of the voltage sag, the influence of the voltage sag on the operation of equipment is reduced, the damage of the voltage sag on the equipment is avoided, and the service life of the equipment is prolonged.
In one embodiment, the first type of parameter includes load voltage before a voltage sag, voltage sag depth, phase change during voltage compensation, and phase jump angle during a voltage sag.
The compensation voltage includes an amplitude and a phase angle. Specifically, step S130 includes:
Figure BDA0002879229240000061
Figure BDA0002879229240000062
wherein U is the amplitude of the compensation voltage, theta is the phase angle of the compensation voltage, UpThe load voltage before voltage sag is shown, Δ U is the voltage sag depth, λ is the phase change during voltage compensation, and β is the phase jump angle during voltage sag.
The amplitude of the compensation voltage is obtained by calculation according to formula 1, the phase angle of the compensation voltage is obtained by calculation according to formula 2, and the compensation voltage is obtained more accurately by calculation according to the relevant parameters of the voltage sag.
In one embodiment, after step S130, the method further includes the step of determining a maximum compensation value: and when the sag voltage of the power grid is in the same phase with the load current, determining the compensation voltage as the maximum compensation value.
The voltage sag is a voltage drop of the voltage sag. Specifically, the maximum compensation value determining step may be performed before step S150, and after determining the maximum compensation value, the maximum compensation value is adopted as the compensation voltage, and then step S150 controls the voltage of the voltage sag to be compensated according to the maximum compensation value and the second type parameter.
In one embodiment, the step of determining the compensation voltage as the maximum compensation value comprises: obtaining the system voltage after the voltage sag, the maximum depth of the voltage sag and the angle of a load power factor; and calculating a maximum compensation value according to the system voltage after the voltage sag, the maximum depth of the voltage sag and the angle of the load power factor. The system voltage after the voltage transient can be collected by a voltage collecting device, such as a voltage sensor. The maximum depth of the voltage sag may be calculated according to the voltage values before and after the voltage sag, or may be preset by a user. The angle of the load power factor can be calculated after the angle measuring device measures the relevant angle, or can be input into the control equipment through an input device after being obtained by a user.
In one embodiment, calculating the maximum compensation value according to the system voltage after the voltage sag, the maximum depth of the voltage sag and the angle of the load power factor comprises:
Figure BDA0002879229240000071
wherein, UmaxIs the maximum compensation value, URSystem voltage after voltage sag, Δ UmaxAlpha is the angle of the load power factor for the maximum depth of the voltage sag.
By adopting the formula 3, the maximum compensation value is calculated according to the system voltage after the voltage sag, the maximum depth of the voltage sag and the angle of the load power factor, and the accuracy is high.
In one embodiment, the second type of parameter includes a voltage amplitude before a voltage sag, a voltage amplitude after a voltage sag, a voltage sag occurrence time and a phase value. Specifically, as shown in fig. 2, step S150 includes step S151 to step S157.
S151: and calculating the difference value of the compensation voltage and the voltage of the voltage sag, and determining a modulation signal according to the difference value.
The voltage of the voltage sag refers to the voltage dropped by the voltage sag of the power grid. Specifically, the difference between the magnitude of the compensation voltage and the magnitude of the voltage sag is calculated. The modulation signal may be a signal indicating the compensation value.
S153: and determining the abrupt change signal according to the voltage amplitude before the voltage sag, the voltage amplitude after the voltage sag, the voltage sag occurrence moment and the phase value.
The abrupt change signal is a signal for indicating an action parameter of the voltage compensation, and comprises an action direction, an action duration and the like. For example, the action direction indicates whether voltage compensation is performed by voltage increase or decrease, and the action duration indicates the duration of the voltage compensation.
S155: the control signal is determined based on the burst signal and the modulation signal.
S157: and controlling the voltage of the voltage sag to be compensated according to the control signal.
The control signal is used for controlling voltage compensation. Specifically, the voltage compensation device may be controlled to inject voltage into the power grid according to the control signal to perform voltage compensation. The modulation signal and the mutation signal are determined, the control signal is determined according to the modulation signal and the mutation signal, and the voltage of the voltage sag is compensated based on the control signal, so that the effective voltage compensation effect is realized, and the damage of the voltage sag to equipment is avoided.
According to the method, voltage is injected, the injected voltage is orthogonal to load current, only reactive power is used for compensation, active power consumption does not exist, and when the voltage sag depth exceeds a boundary condition, certain active power needs to be injected into a power grid system to maintain compensation.
It should be understood that although the various steps in the flowcharts of fig. 1-2 are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least some of the steps in fig. 1-2 may include multiple steps or multiple stages, which are not necessarily performed at the same time, but may be performed at different times, which are not necessarily performed in sequence, but may be performed in turn or alternately with other steps or at least some of the other steps or stages.
In one embodiment, as shown in fig. 3, there is provided a voltage sag control apparatus including: a parameter acquisition module 310, a voltage determination module 330, and a voltage compensation module 350, wherein:
the parameter obtaining module 310 is configured to obtain a first type parameter and a second type parameter of a voltage sag in a power grid.
The voltage determination module 330 is configured to determine a compensation voltage based on the first type of parameter, where the compensation voltage makes phasors between a load current of the power grid and the compensated output voltage perpendicular to each other.
The voltage compensation module 350 is used for compensating the voltage of the voltage sag according to the compensation voltage and the second type parameter control.
The voltage sag control device determines the compensation voltage according to the first type of parameters and the second type of parameters related to the voltage sag in the power grid based on the first type of parameters and the second type of parameters, and performs voltage compensation according to the compensation voltage and the second type of parameters, so that the voltage of the voltage sag is compensated in real time, the influence of the voltage sag on the operation of equipment is reduced, the damage of the voltage sag on the equipment is avoided, and the service life of the equipment is prolonged.
In one embodiment, the first type of parameter includes load voltage before a voltage sag, voltage sag depth, phase change during voltage compensation, and phase jump angle during a voltage sag. The voltage determination module 330 follows the formula:
Figure BDA0002879229240000091
Figure BDA0002879229240000092
and calculating the amplitude and the phase of the compensation voltage. Wherein U is the amplitude of the compensation voltage, theta is the phase angle of the compensation voltage, UpThe load voltage before voltage sag is shown, Δ U is the voltage sag depth, λ is the phase change during voltage compensation, and β is the phase jump angle during voltage sag.
In one embodiment, the voltage sag control apparatus further includes a maximum value calculating module (not shown) configured to determine the compensation voltage as a maximum compensation value when the sag voltage of the grid is in phase with the load current after the voltage determining module 130 determines the compensation voltage based on the first type of parameter.
In one embodiment, the maximum value calculation module is specifically configured to obtain a system voltage after voltage sag, a maximum depth of voltage sag, and an angle of a load power factor; and calculating a maximum compensation value according to the system voltage after the voltage sag, the maximum depth of the voltage sag and the angle of the load power factor.
In one embodiment, the maximum calculation module is based on the formula:
Figure BDA0002879229240000101
and calculating to obtain the maximum compensation value. Wherein, UmaxIs the maximum compensation value, URSystem voltage after voltage sag, Δ UmaxAlpha is the angle of the load power factor for the maximum depth of the voltage sag.
In one embodiment, the second type of parameter includes a voltage amplitude before a voltage sag, a voltage amplitude after a voltage sag, a voltage sag occurrence time and a phase value. Specifically, the voltage compensation module 350 includes a modulation signal determination unit, a sudden change signal determination unit, a control signal determination unit, and a compensation unit.
The modulation signal determining unit is used for calculating the difference value of the compensation voltage and the voltage of the voltage sag and determining the modulation signal according to the difference value. The abrupt change signal determining unit is used for determining an abrupt change signal according to the voltage amplitude before the voltage sag, the voltage amplitude after the voltage sag, the voltage sag occurrence moment and the phase value. The control signal determining unit is used for determining a control signal according to the sudden change signal and the modulation signal. The compensation unit is used for compensating the voltage of the voltage sag according to the control signal control.
For the specific limitation of the voltage sag control device, reference may be made to the above limitation of the voltage sag control method, and details thereof are not repeated herein. The modules in the voltage sag control device can be wholly or partially implemented by software, hardware and a combination thereof. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules. It should be noted that, in the embodiment of the present application, the division of the module is schematic, and is only one logic function division, and there may be another division manner in actual implementation.
In an embodiment, a control device is provided, comprising a memory and a processor, the memory having stored therein a computer program, the processor implementing the steps of the above-described method embodiments when executing the computer program.
The control equipment can realize the voltage sag control method, and similarly, the influence of the voltage sag on the operation of the equipment can be reduced, the damage of the voltage sag on the equipment is avoided, and the service life of the equipment is prolonged.
In an embodiment, a computer-readable storage medium is provided, on which a computer program is stored, which computer program, when being executed by a processor, carries out the steps of the above-mentioned method embodiments.
The computer readable storage medium can realize the voltage sag control method, and similarly, can reduce the influence of the voltage sag on the operation of the equipment, avoid the damage of the voltage sag on the equipment, and prolong the service life of the equipment.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, database or other medium used in the embodiments provided herein can include at least one of non-volatile and volatile memory. Non-volatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical storage, or the like. Volatile Memory can include Random Access Memory (RAM) or external cache Memory. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM), among others.
In the description herein, references to the description of "some embodiments," "other embodiments," "desired embodiments," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, a schematic description of the above terminology may not necessarily refer to the same embodiment or example.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (10)

1. A method of voltage sag control, comprising:
acquiring a first type parameter and a second type parameter of voltage sag in a power grid;
determining a compensation voltage based on the first type of parameter, wherein the compensation voltage enables phasor between load current of the power grid and the compensated output voltage to be vertical to each other;
and controlling the voltage of the voltage sag to be compensated according to the compensation voltage and the second type of parameter.
2. The voltage sag control method according to claim 1, wherein the first type of parameter includes a load voltage before a voltage sag, a voltage sag depth, a phase change at voltage compensation, and a phase jump angle at voltage sag;
the determining a compensation voltage based on the first class of parameters includes:
Figure FDA0002879229230000011
Figure FDA0002879229230000012
wherein U is the amplitude of the compensation voltage, theta is the phase angle of the compensation voltage, and UpThe load voltage before the voltage sag is obtained, delta U is the voltage sag depth, lambda is the phase change during voltage compensation, and beta is the phase jump angle during the voltage sag.
3. The method according to claim 1, wherein after determining the compensation voltage based on the first type of parameter, further comprising:
and when the sag voltage of the power grid is in the same phase with the load current, determining the compensation voltage as a maximum compensation value.
4. The voltage sag control method according to claim 3, wherein the determining the compensation voltage as a maximum compensation value comprises:
obtaining the system voltage after the voltage sag, the maximum depth of the voltage sag and the angle of a load power factor;
and calculating the maximum compensation value according to the system voltage after the voltage sag, the maximum depth of the voltage sag and the angle of the load power factor.
5. The method according to claim 4, wherein the calculating the maximum compensation value according to the system voltage after the voltage sag, the maximum depth of the voltage sag, and the angle of the load power factor comprises:
Figure FDA0002879229230000021
wherein, UmaxIs the maximum compensation value, URSystem voltage after voltage sag, Δ UmaxAnd alpha is the angle of the load power factor, which is the maximum depth of the voltage sag.
6. The voltage sag control method according to claim 1, wherein the second type of parameters include a voltage amplitude before the voltage sag, a voltage amplitude after the voltage sag, a voltage sag occurrence time and a phase value; the controlling the voltage of the voltage sag to be compensated according to the compensation voltage and the second type of parameter includes:
calculating the difference value of the compensation voltage and the voltage of the voltage sag, and determining a modulation signal according to the difference value;
determining an abrupt change signal according to the voltage amplitude before the voltage sag, the voltage amplitude after the voltage sag, the voltage sag occurrence moment and the phase value;
determining a control signal according to the mutation signal and the modulation signal;
and controlling the voltage of the voltage sag to be compensated according to the control signal.
7. A voltage sag control device, comprising:
the parameter acquisition module is used for acquiring a first type parameter and a second type parameter of voltage sag in a power grid;
the voltage determination module is used for determining a compensation voltage based on the first type of parameters, wherein the compensation voltage enables phasors between the load current of the power grid and the compensated output voltage to be vertical to each other;
and the voltage compensation module is used for controlling the compensation of the voltage sag according to the compensation voltage and the second type of parameter.
8. The voltage sag control device according to claim 7, further comprising:
and the maximum value calculation module is used for determining the compensation voltage as a maximum compensation value when the sag voltage of the power grid is in the same phase with the load current after the voltage determination module determines the compensation voltage based on the first type of parameters.
9. A control device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor realizes the steps of the method of any one of claims 1 to 6 when executing the computer program.
10. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method of any one of claims 1 to 6.
CN202011638370.XA 2020-12-31 2020-12-31 Voltage sag control method, device, control equipment and storage medium Pending CN112769142A (en)

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Cited By (2)

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Publication number Priority date Publication date Assignee Title
CN114928059A (en) * 2022-05-31 2022-08-19 嘉兴正弦电气有限公司 Method and system for solving voltage sag problem
CN116418122A (en) * 2023-06-12 2023-07-11 深圳市利业机电设备有限公司 Power distribution method and device and full-digital intelligent comprehensive power distribution cabinet

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Publication number Priority date Publication date Assignee Title
CN114928059A (en) * 2022-05-31 2022-08-19 嘉兴正弦电气有限公司 Method and system for solving voltage sag problem
CN116418122A (en) * 2023-06-12 2023-07-11 深圳市利业机电设备有限公司 Power distribution method and device and full-digital intelligent comprehensive power distribution cabinet
CN116418122B (en) * 2023-06-12 2023-09-08 深圳市利业机电设备有限公司 Power distribution method and device and full-digital intelligent comprehensive power distribution cabinet

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