CN115133509A - Method and device for judging fault phase of converter control system with series compensation device - Google Patents

Method and device for judging fault phase of converter control system with series compensation device Download PDF

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CN115133509A
CN115133509A CN202210893452.1A CN202210893452A CN115133509A CN 115133509 A CN115133509 A CN 115133509A CN 202210893452 A CN202210893452 A CN 202210893452A CN 115133509 A CN115133509 A CN 115133509A
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fault
phase
sequence component
judging
control system
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刘玮
屠卿瑞
李一泉
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Guangdong Power Grid Co Ltd
Electric Power Dispatch Control Center of Guangdong Power Grid Co Ltd
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Guangdong Power Grid Co Ltd
Electric Power Dispatch Control Center of Guangdong Power Grid Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R25/00—Arrangements for measuring phase angle between a voltage and a current or between voltages or currents
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/08—Locating faults in cables, transmission lines, or networks
    • 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
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/76—Power conversion electric or electronic aspects

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  • General Physics & Mathematics (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

The application discloses a method and a device for judging fault phases of a converter control system with a series compensation device, wherein the method comprises the following steps: injecting a high-frequency harmonic signal into a converter control system to be tested; extracting harmonic current at the protection installation position of a converter control system to be tested, and extracting a positive sequence component, a negative sequence component and a zero sequence component of the harmonic current; and judging the fault phase by combining preset phase selection criteria according to the amplitudes and phase differences of the positive sequence component, the negative sequence component and the zero sequence component of the harmonic current. According to the method, the harmonic current at the protective installation position is extracted through the injection of the harmonic signal and the FFT algorithm, and the fault phase selection is carried out by utilizing the phase relation of the harmonic current sequence component. The capacitance reactance of the series compensation capacitor is reduced along with the increase of the frequency, and the line impedance and the synchronous machine impedance are increased along with the increase of the frequency, so that the fault phase judging method provided by the application has good performance in a system with a series compensation device.

Description

Method and device for judging fault phase of converter control system with series compensation device
Technical Field
The application relates to the technical field of relay protection, in particular to a method and a device for judging fault phases of a converter control system with a series compensation device.
Background
At present, large-capacity new energy field stations such as photovoltaic power stations and wind power stations in China are mostly located in western remote areas, and in order to improve the transmission capacity of the field stations, series compensation devices (series compensation devices) are often installed at the tail ends of transmission lines of the field stations. However, the conventional protection principle depends on the sequence impedance characteristics of the system, and unlike the transmission line and the synchronous machine whose equivalent sequence impedance is approximately 90 ° in phase, the series compensation device presents a significant capacitive reactance characteristic, which makes some conventional protection possible to have adaptability problems in the series compensation-containing system.
At present, the research on the influence of the series compensation device on the traditional protection is mainly focused on the distance protection. Part of the research indicates that the capacity of the series compensation device may cause the phenomenon of transient overtaking based on the power frequency distance protection, part of the research indicates the influence of the series compensation device access on the pilot protection, and a corresponding improvement scheme is provided. However, the influence of the access of the series compensation device on the phase selection element is not researched in the prior art. In practical application, whether the phase selection element is used for the sequence current or the sequence voltage, the protection principle of the phase selection element depends on the characteristic that the phase of the sequence impedance of the system element is approximately 90 degrees. This feature can be compromised when a string compensation device is present in the system. Therefore, when the conventional phase selection element contains a series compensation device, the normal phase of the system is easily judged as a fault phase. And no solution to this situation has emerged so far.
Disclosure of Invention
The present application aims to provide a method and a device for determining a faulty phase of a converter control system including a series compensation device, so as to solve the problem that the performance of a phase selection element in the existing converter control system including the series compensation device is reduced, and even a phase selection failure is easy to occur.
In order to achieve the above object, the present application provides a method for determining a fault phase of a converter control system including a series compensation device, including:
injecting a high-frequency harmonic signal into a converter control system to be tested;
extracting harmonic current at the protection installation position of a converter control system to be tested, and extracting a positive sequence component, a negative sequence component and a zero sequence component of the harmonic current;
and according to the amplitudes of the positive sequence component, the negative sequence component and the zero sequence component of the harmonic current and the phase difference between every two components, combining a preset phase selection criterion to judge the fault phase.
Further, as a preferred option, the determining the fault phase according to the amplitudes of the positive sequence component, the negative sequence component and the zero sequence component of the harmonic current and the phase difference between every two components in combination with a preset phase selection criterion includes:
the positive sequence component, the negative sequence component and the zero sequence component of the harmonic current are respectively recorded as
Figure BDA0003768470470000021
And
Figure BDA0003768470470000022
when in use
Figure BDA0003768470470000023
And
Figure BDA0003768470470000024
are all less than
Figure BDA0003768470470000025
When the fault rate is 5 percent, judging that the fault type is a three-phase symmetric fault;
when the temperature is higher than the set temperature
Figure BDA0003768470470000026
Is less than
Figure BDA0003768470470000027
And is
Figure BDA0003768470470000028
Amplitude greater than
Figure BDA0003768470470000029
If so, judging the fault type to be a first inter-phase fault;
when in use
Figure BDA00037684704700000210
Amplitude of (1) and
Figure BDA00037684704700000211
are all greater than
Figure BDA00037684704700000212
And if so, judging the fault type to be a single-phase fault or a second interphase fault.
Further, preferably, the method for determining a fault phase of a converter control system including a series compensation device further includes:
when the fault type is the first phase-to-phase fault, calculating
Figure BDA00037684704700000213
And
Figure BDA00037684704700000214
phase difference of (2):
if it is
Figure BDA00037684704700000215
Judging the fault type to be BC fault;
if it is
Figure BDA00037684704700000216
Judging the fault type to be a CA fault;
if it is
Figure BDA00037684704700000217
Judging the fault type to be AB fault;
when the fault type is single-phase fault or second inter-phase fault, calculating
Figure BDA00037684704700000218
And
Figure BDA00037684704700000219
and
Figure BDA00037684704700000220
phase difference of (a):
if it is
Figure BDA00037684704700000221
And is provided with
Figure BDA00037684704700000222
Judging the fault type to be AG fault;
if it is
Figure BDA0003768470470000031
And is
Figure BDA0003768470470000032
Judging the fault type to be BCG fault;
if it is
Figure BDA0003768470470000033
And is
Figure BDA0003768470470000034
Judging the fault type to be BG fault;
if it is
Figure BDA0003768470470000035
And is
Figure BDA0003768470470000036
Judging the fault type to be CAG fault;
if it is
Figure BDA0003768470470000037
And is
Figure BDA0003768470470000038
Judging the fault type to be CG fault;
if it is
Figure BDA0003768470470000039
And is
Figure BDA00037684704700000310
The fault type is determined to be an ABG fault.
Further, preferably, the injecting a high-frequency harmonic signal into the converter to be tested control system includes:
and superposing harmonic electric reference values in a PWM link of a converter control system to realize the injection of high-frequency harmonic signals.
Further, preferably, the method for determining a faulty phase in a converter control system including a series compensation device further includes:
decoupling control of the power frequency electrical quantity and the harmonic electrical quantity of the injected high-frequency harmonic signal in the converter control system is realized by utilizing the improved phase-locked loop; wherein the high-frequency harmonic signal is a high-frequency higher harmonic signal.
Further, preferably, a harmonic component of the harmonic current is extracted using a full-wave fourier algorithm.
Further, preferably, the extracting the positive sequence component, the negative sequence component and the zero sequence component of the harmonic current includes:
extracting a positive sequence component, a negative sequence component and a zero sequence component of the harmonic current by using park transformation; wherein the park transformation matrix C Park Comprises the following steps:
Figure BDA00037684704700000311
and theta is the common point voltage phase calculated by the phase-locked loop.
The application also provides a converter control system fault phase discriminating device that contains series compensation device, includes:
the high-frequency harmonic injection unit is used for injecting a high-frequency harmonic signal into the converter control system to be tested;
the harmonic component extraction unit is used for extracting the harmonic current at the protection installation position of the converter control system to be tested and extracting the positive sequence component, the negative sequence component and the zero sequence component of the harmonic current;
and the fault phase judging unit is used for judging a fault phase by combining preset phase selection criteria according to the amplitudes and phase differences between every two of the positive sequence component, the negative sequence component and the zero sequence component of the harmonic current.
The present application further provides a terminal device, including:
one or more processors;
a memory coupled to the processor for storing one or more programs;
when the one or more programs are executed by the one or more processors, the one or more processors implement the method for determining the fault phase of the converter control system with the series compensation device as described in any one of the above.
The present application further provides a computer-readable storage medium, on which a computer program is stored, and the computer program, when executed by a processor, implements the method for determining a fault phase of a converter control system including a series compensation device according to any one of the above.
Compared with the prior art, the beneficial effects of this application lie in:
the method and the device comprehensively consider the characteristics of a fault sequence network containing a series compensation system, decoupling of the power frequency electrical quantity and the harmonic electrical quantity in active harmonic injection control and the influence of the harmonic frequency on the protection performance. Firstly, a control strategy capable of injecting harmonic waves into a power system is designed, then a fault total quantity network constructed by harmonic wave components is combined, the sequence component phase relation of current at protection installation positions under different fault types is deduced, and phase selection criteria are provided. When the system has a fault, the fault phase selection can be realized by calculating the phase difference of the harmonic current sequence component at the protective installation position.
The method and the device realize the injection of the harmonic signals by adjusting the control strategy of the converter, extract the harmonic current at the protective installation position by the FFT algorithm, and perform fault phase selection by utilizing the phase relation of the harmonic current sequence component. The capacitance reactance of the series compensation capacitor is reduced along with the increase of the frequency, and the line impedance and the synchronous machine impedance are increased along with the increase of the frequency, so that the fault phase judging method has good performance in a system with a series compensation device.
Drawings
In order to more clearly illustrate the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic flowchart of a method for determining a fault phase of a converter control system including a series compensation device according to an embodiment of the present disclosure;
fig. 2 is a schematic diagram of a 175MW photovoltaic system built in PSCAD software provided in an embodiment of the present application;
FIG. 3 is a control block diagram of active harmonic injection provided by an embodiment of the present application;
FIG. 4 is a flow diagram of a proposed phase element provided in an embodiment of the present application;
fig. 5 is a schematic structural diagram of a device for determining a faulty phase of a converter control system including a series compensation device according to an embodiment of the present application;
fig. 6 is a schematic structural diagram of a terminal device according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only some embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be understood that the step numbers used herein are for convenience of description only and are not intended as limitations on the order in which the steps are performed.
It is to be understood that the terminology used 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. As used in the specification of the present application and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
The terms "comprises" and "comprising" indicate the presence of the described features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
The term "and/or" refers to and includes any and all possible combinations of one or more of the associated listed items.
Referring to fig. 1, an embodiment of the present application provides a method for determining a fault phase of a converter control system including a series compensation device. As shown in fig. 1, the method for determining a fault phase of a converter control system including a series compensation device includes steps S10 to S30. The method comprises the following steps:
and S10, injecting high-frequency harmonic signals into the converter to be tested control system.
Referring to fig. 2, fig. 2 provides a schematic diagram of a 175MW photovoltaic system built in PSCAD software, including a converter station system (converter control system) and a synchronous machine system. In this step, during a system fault, a harmonic voltage signal, that is, a harmonic electrical reference value, is superimposed in a Pulse Width Modulation (PWM) link of the converter control system to inject a high-frequency harmonic signal.
Further, fig. 3 illustrates a proposed active harmonic control block diagram, based on the control strategy shown in fig. 3, injecting harmonic signals to the converter control system during a fault. Wherein
Figure BDA0003768470470000061
Figure BDA0003768470470000062
Respectively are power frequency signal components of a common point of the converter station; the superscript denotes the reference value of the corresponding component;
Figure BDA0003768470470000063
and
Figure BDA0003768470470000064
representing the reference value of the positive and negative sequence components of the power frequency voltage; u. of k Representing the injected harmonic component reference value.
In one embodiment, decoupling control of the electrical quantity at the operating frequency and the electrical quantity at the harmonics of the injected high frequency harmonic signal in the inverter control system is accomplished using an improved phase locked loop. Preferably, the high-frequency harmonic signal is a high-frequency higher harmonic signal, so that the influence of a series compensation device in a line on the protection performance is reduced.
And S20, extracting the harmonic current at the protection installation position of the converter control system to be tested, and extracting the positive sequence component, the negative sequence component and the zero sequence component of the harmonic current.
In this step, a full-wave fourier algorithm is used to extract harmonic components of the harmonic current.
In a specific embodiment, the system power frequency signal is 50Hz, and the injected harmonic signal is 200 Hz. At this time, at least 20ms of time window is required to extract the 200Hz signal accurately, and the signal is extracted by full-wave fourier transform (FFT) algorithm.
Further, extracting a positive sequence component, a negative sequence component and a zero sequence component of the harmonic current by utilizing park transformation; wherein the park transformation matrix C Park Comprises the following steps:
Figure BDA0003768470470000071
and theta is the common point voltage phase calculated by the phase-locked loop.
And S30, according to the amplitudes and phase differences of the positive sequence component, the negative sequence component and the zero sequence component of the harmonic current, combining a preset phase selection criterion to judge the fault phase.
In the step, the phase difference is calculated by comparing the amplitudes of the positive sequence component, the negative sequence component and the zero sequence component, and the fault phase selection is completed by combining the criterion. The specific flow chart is shown in fig. 4, and specifically includes the following steps:
the positive sequence component, the negative sequence component and the zero sequence component of the harmonic current are respectively recorded as
Figure BDA0003768470470000072
And
Figure BDA0003768470470000073
when in use
Figure BDA0003768470470000074
And
Figure BDA0003768470470000075
are all less than
Figure BDA0003768470470000076
When the fault rate is 5 percent, judging that the fault type is a three-phase symmetric fault;
when in use
Figure BDA0003768470470000077
Is less than
Figure BDA0003768470470000078
And is
Figure BDA0003768470470000079
Amplitude greater than
Figure BDA00037684704700000710
If so, judging the fault type to be a first inter-phase fault;
when in use
Figure BDA00037684704700000711
Amplitude of (1) and
Figure BDA00037684704700000712
are all greater than
Figure BDA00037684704700000713
And if so, judging the fault type to be a single-phase fault or a second interphase fault.
In one specific embodiment, when the fault type is a first phase-to-phase fault, calculating
Figure BDA00037684704700000714
And
Figure BDA00037684704700000715
phase difference of (2):
if it is
Figure BDA00037684704700000716
Judging the fault type to be BC fault;
if it is
Figure BDA00037684704700000717
Judging the fault type to be a CA fault;
if it is
Figure BDA00037684704700000718
Judging the fault type to be AB fault;
in one embodiment, the calculation is performed when the fault type is a single-phase fault or a second interphase fault
Figure BDA00037684704700000719
And
Figure BDA00037684704700000720
and
Figure BDA00037684704700000721
phase difference of (2):
if it is
Figure BDA00037684704700000722
And is
Figure BDA00037684704700000723
Judging the fault type to be AG fault;
if it is
Figure BDA0003768470470000081
And is
Figure BDA0003768470470000082
Judging the fault type to be BCG fault;
if it is
Figure BDA0003768470470000083
And is
Figure BDA0003768470470000084
Judging the fault type to be BG fault;
if it is
Figure BDA0003768470470000085
And is provided with
Figure BDA0003768470470000086
Judging the fault type to be CAG fault;
if it is
Figure BDA0003768470470000087
And is
Figure BDA0003768470470000088
Judging the fault type to be CG fault;
if it is
Figure BDA0003768470470000089
And is
Figure BDA00037684704700000810
The fault type is determined to be an ABG fault.
In summary, the method for judging a fault phase of a converter control system including a series compensation device according to the embodiment of the present application implements injection of a harmonic signal by adjusting a control strategy of the converter, extracts a harmonic current at a protection installation position by an FFT algorithm, and performs fault phase selection by using a phase relationship of a harmonic current sequence component. The capacitance reactance of the series compensation capacitor is reduced along with the increase of the frequency, and the line impedance and the synchronous machine impedance are increased along with the increase of the frequency, so that the fault phase judging method has good performance in a system with a series compensation device.
Referring to fig. 5, an embodiment of the present application further provides a device for determining a fault phase of a converter control system including a series compensation device, including:
the high-frequency harmonic injection unit 01 is used for injecting a high-frequency harmonic signal into the converter control system to be tested;
the harmonic component extraction unit 02 is used for extracting the harmonic current at the protection installation position of the converter control system to be tested and extracting the positive sequence component, the negative sequence component and the zero sequence component of the harmonic current;
and the fault phase judging unit 03 is configured to judge a fault phase according to the amplitudes of the positive sequence component, the negative sequence component, and the zero sequence component of the harmonic current and the phase difference between every two components, by combining a preset phase selection criterion.
In an embodiment, the faulty phase determination unit 03 is further configured to:
the positive sequence component, the negative sequence component and the zero sequence component of the harmonic current are respectively recorded as
Figure BDA00037684704700000811
And
Figure BDA00037684704700000812
when in use
Figure BDA0003768470470000091
And
Figure BDA0003768470470000092
are all less than
Figure BDA0003768470470000093
When the fault rate is 5 percent, judging that the fault type is a three-phase symmetric fault;
when the temperature is higher than the set temperature
Figure BDA0003768470470000094
Is less than
Figure BDA0003768470470000095
And is
Figure BDA0003768470470000096
Amplitude greater than
Figure BDA0003768470470000097
If so, judging the fault type to be a first inter-phase fault;
when the temperature is higher than the set temperature
Figure BDA0003768470470000098
Amplitude of (1) and
Figure BDA0003768470470000099
are all greater than
Figure BDA00037684704700000910
And if so, judging the fault type to be a single-phase fault or a second interphase fault.
When the fault type is the first phase-to-phase fault, calculating
Figure BDA00037684704700000911
And
Figure BDA00037684704700000912
phase difference of (2):
if it is
Figure BDA00037684704700000913
Judging the fault type to be BC fault;
if it is
Figure BDA00037684704700000914
Judging the fault type to be a CA fault;
if it is
Figure BDA00037684704700000915
Judging the fault type to be AB fault;
when the fault type isIn case of single-phase fault or second interphase fault, calculating
Figure BDA00037684704700000916
And
Figure BDA00037684704700000917
and
Figure BDA00037684704700000918
phase difference of (2):
if it is
Figure BDA00037684704700000919
And is
Figure BDA00037684704700000920
Judging the fault type to be AG fault;
if it is
Figure BDA00037684704700000921
And is
Figure BDA00037684704700000922
Judging the fault type to be BCG fault;
if it is
Figure BDA00037684704700000923
And is provided with
Figure BDA00037684704700000924
Judging the fault type to be BG fault;
if it is
Figure BDA00037684704700000925
And is
Figure BDA00037684704700000926
Judging the fault type to be CAG fault;
if it is
Figure BDA00037684704700000927
And is
Figure BDA00037684704700000928
Judging the fault type to be CG fault;
if it is
Figure BDA00037684704700000929
And is provided with
Figure BDA00037684704700000930
The fault type is determined to be an ABG fault.
In one embodiment, the high frequency harmonic injection unit 01 is further configured to superimpose a harmonic electrical reference value on a PWM segment of the inverter control system to implement injection of the high frequency harmonic signal.
In one embodiment, the high-frequency harmonic injection unit 01 is further configured to implement decoupling control of an operating frequency electrical quantity and a harmonic electrical quantity of an injected high-frequency harmonic signal in the converter control system by using an improved phase-locked loop; wherein the high-frequency harmonic signal is a high-frequency higher harmonic signal.
In one embodiment, the harmonic component extraction unit 02 is further configured to extract a harmonic component of the harmonic current by using a full-wave fourier algorithm.
In one embodiment, the harmonic component extracting unit 02 is further configured to extract a positive sequence component, a negative sequence component, and a zero sequence component of the harmonic current using park transformation; wherein the park transformation matrix C Park Comprises the following steps:
Figure BDA0003768470470000101
and theta is the common point voltage phase calculated by the phase-locked loop.
It can be understood that the converter control system fault phase determination device including the series compensation device provided in the embodiment of the present application is used to implement the converter control system fault phase determination method including the series compensation device according to any one of the embodiments described above, and achieve the same effect as that of the above embodiment, and further description is omitted here.
Referring to fig. 6, an embodiment of the present application provides a terminal device, including:
one or more processors;
a memory coupled to the processor for storing one or more programs;
when the one or more programs are executed by the one or more processors, the one or more processors implement the method for determining the fault phase of the converter control system with the series compensation device.
The processor is used for controlling the overall operation of the terminal equipment so as to complete all or part of the steps of the method for judging the fault phase of the converter control system with the series compensation device. The memory is used to store various types of data to support operation at the terminal device, and these data may include, for example, instructions for any application or method operating on the terminal device, as well as application-related data. The Memory may be implemented by any type of volatile or non-volatile Memory device or combination thereof, such as Static Random Access Memory (SRAM), Electrically Erasable Programmable Read-Only Memory (EEPROM), Erasable Programmable Read-Only Memory (EPROM), Programmable Read-Only Memory (PROM), Read-Only Memory (ROM), magnetic Memory, flash Memory, magnetic disk, or optical disk.
In an exemplary embodiment, the terminal Device may be implemented by one or more Application Specific 1 integrated circuits (AS 1C), a Digital Signal Processor (DSP), a Digital Signal Processing Device (DSPD), a Programmable Logic Device (PLD), a Field Programmable Gate Array (FPGA), a controller, a microcontroller, a microprocessor, or other electronic components, and is configured to perform the method for determining the fault phase of the inverter control system including the string compensation Device according to any one of the embodiments described above, and achieve the technical effects consistent with the above method.
In another exemplary embodiment, a computer readable storage medium including a computer program is further provided, where the computer program is executed by a processor to implement the steps of the method for determining a fault phase of a converter control system including a series compensation device according to any one of the above embodiments. For example, the computer readable storage medium may be the above-mentioned memory including a computer program, and the above-mentioned computer program may be executed by a processor of a terminal device to perform the method for determining the fault phase of the converter control system including the series compensation device according to any one of the above-mentioned embodiments, and achieve the technical effects consistent with the above-mentioned method.
The foregoing is a preferred embodiment of the present application, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present application, and these modifications and decorations are also regarded as the protection scope of the present application.

Claims (10)

1. A method for judging a fault phase of a converter control system with a series compensation device is characterized by comprising the following steps: injecting a high-frequency harmonic signal into a converter control system to be tested;
extracting harmonic current at the protection installation position of a converter control system to be tested, and extracting a positive sequence component, a negative sequence component and a zero sequence component of the harmonic current;
and according to the amplitudes of the positive sequence component, the negative sequence component and the zero sequence component of the harmonic current and the phase difference between every two components, combining a preset phase selection criterion to judge the fault phase.
2. The method for judging the fault phase of the converter control system with the series compensation device according to claim 1, wherein the step of judging the fault phase according to the amplitudes and phase differences of the positive sequence component, the negative sequence component and the zero sequence component of the harmonic current in combination with a preset phase selection criterion comprises the following steps:
the positive sequence component, the negative sequence component and the zero sequence component of the harmonic current are respectively recorded as
Figure FDA0003768470460000011
And
Figure FDA0003768470460000012
when in use
Figure FDA0003768470460000013
And
Figure FDA0003768470460000014
are all less than
Figure FDA0003768470460000015
When the fault rate is 5 percent, judging that the fault type is a three-phase symmetric fault;
when in use
Figure FDA0003768470460000016
Is less than
Figure FDA0003768470460000017
And is
Figure FDA0003768470460000018
Amplitude greater than
Figure FDA0003768470460000019
If so, judging the fault type to be a first inter-phase fault;
when in use
Figure FDA00037684704600000110
Amplitude of (1) and
Figure FDA00037684704600000111
are all greater than
Figure FDA00037684704600000112
And if so, judging the fault type to be a single-phase fault or a second interphase fault.
3. The method according to claim 2, further comprising:
when the fault type is the first phase-to-phase fault, calculating
Figure FDA00037684704600000113
And
Figure FDA00037684704600000114
phase difference of (2):
if it is
Figure FDA00037684704600000115
Judging the fault type to be BC fault;
if it is
Figure FDA00037684704600000116
Judging the fault type to be a CA fault;
if it is
Figure FDA00037684704600000117
Judging the fault type to be AB fault;
when the fault type is single-phase fault or second interphase fault, calculating
Figure FDA00037684704600000118
And
Figure FDA00037684704600000119
and
Figure FDA00037684704600000120
phase difference of (2):
if it is
Figure FDA0003768470460000021
And is provided with
Figure FDA0003768470460000022
Judging the fault type to be AG fault;
if it is
Figure FDA0003768470460000023
And is
Figure FDA0003768470460000024
Judging the fault type to be BCG fault;
if it is
Figure FDA0003768470460000025
And is provided with
Figure FDA0003768470460000026
Judging the fault type to be BG fault;
if it is
Figure FDA0003768470460000027
And is provided with
Figure FDA0003768470460000028
Judging the fault type to be CAG fault;
if it is
Figure FDA0003768470460000029
And is
Figure FDA00037684704600000210
Judging the fault type to be CG fault;
if it is
Figure FDA00037684704600000211
And is
Figure FDA00037684704600000212
The fault type is determined to be an ABG fault.
4. The method according to claim 1, wherein the injecting a high-frequency harmonic signal into the converter control system to be tested comprises:
and superposing harmonic electric reference values in a PWM link of a converter control system to realize the injection of high-frequency harmonic signals.
5. The method according to claim 4, further comprising:
decoupling control of the power frequency electrical quantity and the harmonic electrical quantity of the injected high-frequency harmonic signal in the converter control system is realized by utilizing the improved phase-locked loop; wherein the high-frequency harmonic signal is a high-frequency higher harmonic signal.
6. The method according to claim 1, wherein the harmonic component of the harmonic current is extracted by a full-wave fourier algorithm.
7. The method according to claim 1, wherein the extracting a positive sequence component, a negative sequence component and a zero sequence component of the harmonic current comprises:
extracting a positive sequence component, a negative sequence component and a zero sequence component of the harmonic current by using park transformation; wherein the park transformation matrix C Park Comprises the following steps:
Figure FDA0003768470460000031
and theta is the common point voltage phase calculated by the phase-locked loop.
8. A converter control system fault phase discriminating device containing a series compensation device is characterized by comprising:
the high-frequency harmonic injection unit is used for injecting a high-frequency harmonic signal into the converter control system to be tested;
the harmonic component extraction unit is used for extracting the harmonic current at the protective installation position of the converter control system to be tested and extracting a positive sequence component, a negative sequence component and a zero sequence component of the harmonic current;
and the fault phase judging unit is used for judging a fault phase by combining preset phase selection criteria according to the amplitudes and phase differences between every two of the positive sequence component, the negative sequence component and the zero sequence component of the harmonic current.
9. A terminal device, comprising:
one or more processors;
a memory coupled to the processor for storing one or more programs;
when executed by the one or more processors, cause the one or more processors to implement the method for determining a fault phase in a converter control system including a series compensation apparatus according to any one of claims 1 to 7.
10. A computer-readable storage medium, on which a computer program is stored, wherein the computer program, when executed by a processor, implements a method for determining a faulty phase in a converter control system including a series compensation device according to any one of claims 1 to 7.
CN202210893452.1A 2022-07-27 2022-07-27 Method and device for judging fault phase of converter control system with series compensation device Pending CN115133509A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115882432A (en) * 2023-03-02 2023-03-31 山东大学 Active injection type harmonic current differential protection method and system for power distribution network containing IIDG
CN116754899A (en) * 2023-08-21 2023-09-15 深圳市德兰明海新能源股份有限公司 Grid fault detection method and device for micro-grid-connected system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115882432A (en) * 2023-03-02 2023-03-31 山东大学 Active injection type harmonic current differential protection method and system for power distribution network containing IIDG
CN116754899A (en) * 2023-08-21 2023-09-15 深圳市德兰明海新能源股份有限公司 Grid fault detection method and device for micro-grid-connected system
CN116754899B (en) * 2023-08-21 2023-10-17 深圳市德兰明海新能源股份有限公司 Grid fault detection method and device for micro-grid-connected system

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