CN111711159B - Method for preventing unbalanced current of capacitor of alternating current filter from flowing through compensation - Google Patents

Method for preventing unbalanced current of capacitor of alternating current filter from flowing through compensation Download PDF

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CN111711159B
CN111711159B CN202010590773.5A CN202010590773A CN111711159B CN 111711159 B CN111711159 B CN 111711159B CN 202010590773 A CN202010590773 A CN 202010590773A CN 111711159 B CN111711159 B CN 111711159B
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current
unbalanced
value
execute
protection
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CN111711159A (en
Inventor
吴晋波
洪权
刘志豪
李理
肖纳敏
熊尚峰
朱维钧
欧阳帆
刘伟良
梁文武
臧欣
蔡昱华
徐浩
余斌
李刚
严亚兵
许立强
王善诺
尹超勇
李振文
谢培元
周帆
姜新凡
胡迪军
叶健辉
李龙
王阳光
邓小亮
张宏
郑映斌
伍剑利
王天一
董国琴
吴雪琴
曾林俊
牟秀君
陈胜春
邹晓虎
王子奕
李燕飞
李林山
肖俊先
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State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Hunan Electric Power Co Ltd
State Grid Hunan Electric Power Co Ltd
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State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Hunan Electric Power Co Ltd
State Grid Hunan Electric Power Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H1/00—Details of emergency protective circuit arrangements
    • H02H1/0092—Details of emergency protective circuit arrangements concerning the data processing means, e.g. expert systems, neural networks
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H1/00—Details of emergency protective circuit arrangements
    • H02H1/04—Arrangements for preventing response to transient abnormal conditions, e.g. to lightning or to short duration over voltage or oscillations; Damping the influence of dc component by short circuits in ac networks
    • 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
    • H02H7/16—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 for capacitors
    • 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
    • H02J3/01—Arrangements for reducing harmonics or ripples
    • 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
    • H02J3/26—Arrangements for eliminating or reducing asymmetry in polyphase 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
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/40—Arrangements for reducing harmonics
    • 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
    • Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Artificial Intelligence (AREA)
  • Evolutionary Computation (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Power Conversion In General (AREA)

Abstract

The invention discloses a method for avoiding the over-compensation of unbalanced current of an alternating current filter capacitor, which comprises the steps of sequentially checking whether high-voltage direct current is in power failure or not, whether a detected alternating current filter is in power failure or not, whether the detected alternating current filter capacitor is adjusted in maintenance or not, whether the inherent unbalanced current compensation value of the detected alternating current filter is larger than a threshold value or not, and eliminating the original inherent unbalanced current compensation value by adopting a field experiment method before the capacitor is put into operation during annual maintenance; the experiment for removing the original unbalance compensation value is not carried out in the high-voltage direct-current operation period; and after the alternating current filter is put into operation, limiting the unbalanced current compensation value. According to the invention, the original unbalance current compensation value and the limited compensation value of the capacitor are cleared before the AC filter is put into operation, so that the unbalance current of the capacitor of the AC filter is prevented from being overcompensated, and the protection misoperation risk is reduced.

Description

Method for preventing unbalanced current of capacitor of alternating current filter from flowing through compensation
Technical Field
The invention relates to a control method of a high-voltage direct-current transmission alternating current filter, in particular to a method for avoiding over-compensation of unbalanced current of a capacitor of an alternating current filter.
Background
An ac filter is an essential device in high voltage dc transmission, and the operating state of the ac filter will directly affect the operation of the high voltage dc transmission. Capacitor imbalance protection is an important component of ac filter protection. The mechanism is that whether the capacitance on two sides of a bridge arm changes or not is judged by detecting the change trend of unbalanced current of the capacitor bank, and then whether the capacitor bank breaks down or not is judged. Inherent unbalanced current caused by inconsistent capacitance of capacitor banks on two sides of a bridge arm and changed along with load is a negative factor influencing the unbalanced protection accuracy of the capacitors. Therefore, according to the related standard requirement, the inherent unbalanced current of the capacitor which changes along with the load is compensated, so as to improve the accuracy of the unbalanced protection of the capacitor. The capacitor unbalance protection generally takes the absolute value of the capacitor unbalance current as a protection starting criterion, and takes the absolute value of the ratio of the capacitor unbalance current to the through current as a protection action criterion, as shown in formula (1).
Figure BDA0002556169380000011
In the formula (1), Δ IubThe capacitor transient unbalance current is the value after the inherent unbalance current is compensated; i istroFor capacitor through current, Δ IubqbThe transient state unbalanced starting value is set inside the device without setting; Δ KubzbThe transient imbalance protection is fixed.
The unbalanced protection is provided with three stages of protection, specifically as follows:
i section: when the absolute value of the ratio of the unbalanced current to the through current of any phase capacitor is greater than K1, delaying for 10s to alarm;
and II, section: when the unbalanced current of any phase is larger than K2, delaying 120min to trip;
stage III: when the unbalanced current of any phase is larger than K3, the action of delaying 200ms is performed on the gate.
However, in the actual operation process, after the capacitor of the ac filter is replaced, an accident of protection malfunction caused by excessive inherent unbalanced current overcompensation occurs, which affects the normal operation of the ac filter and even the high-voltage dc transmission.
Therefore, a method for preventing the unbalanced current of the ac filter capacitor from being overcompensated is needed to reduce the risk of protection malfunction. There are a number of existing methods and systems related to hvdc transmission ac filters, but there is essentially no compensation related to unbalance current. For example, chinese patent application No. 201910842858.5 discloses an on-line monitoring method for unbalanced current of an ac filter, which is used for monitoring each unbalanced current at present, but does not relate to a method related to unbalanced current compensation.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: the invention provides a method for preventing the unbalanced current of the capacitor of the alternating current filter from overcompensating, aiming at the problems in the prior art.
In order to solve the technical problems, the invention adopts the technical scheme that:
a method of avoiding over-compensation of an ac filter capacitor imbalance current, comprising:
1) judging whether the high-voltage direct current has power failure, and if so, skipping to execute the step 2); otherwise, the unbalance compensation value is not changed, and the step 6) is executed;
2) judging whether the detected AC filter has power failure, if so, skipping to execute the step 3); otherwise, the unbalance compensation value is not changed, and the step 6) is executed;
3) judging whether the capacitor of the alternating current filter to be detected is adjusted during maintenance, and if so, skipping to execute the step 4); otherwise, the unbalance compensation value is not changed, and the step 6) is executed;
4) judging whether the inherent unbalanced current compensation value of the alternating current filter to be detected is larger than a threshold value, and if so, skipping to execute the step 5); otherwise, the unbalance compensation value is not changed, and the step 6) is executed;
5) eliminating original inherent unbalanced current compensation value by using a field experiment method;
6) putting the alternating current filter bank to be detected into operation to be electrified;
7) judging whether the new inherent unbalanced current of the alternating current filter to be detected is larger than a threshold value, and if so, skipping to execute the step 8); otherwise, skipping to execute the step 10);
8) the detected AC filter bank is out of operation and power cut;
9) readjusting the capacitor capacity of the detected alternating current filter bank, and executing the step 6) again;
10) and the protection of the alternating current filter is carried out for unbalance current compensation, a new unbalance compensation value is set, and the process is finished.
Optionally, the threshold value in step 4) and step 7) is a difference between the unbalanced protection iii-stage protection action fixed value and the unbalanced protection ii-stage protection action fixed value.
Optionally, the step 5) of eliminating the original inherent unbalanced current compensation value by using a field experiment method comprises the following steps:
5.1) removing the optical fiber of the combining unit of the unbalanced current transformer to the telecontrol module, and skipping to execute the step 5.2);
5.2) determining a secondary loop for measuring the through current of the capacitor, disconnecting the wiring of the transformer side of the through current secondary loop at the terminal block of the I/O interface cabinet of the alternating current filter protection equipment, and skipping to execute the step 5.3);
5.3) calculating the rated through current value I when the alternating current filter is put into operation0Applying a secondary signal of a through current corresponding to a primary value equal to a rated through current value I to the I/O interface cabinet terminal block of the AC filter protection device by using a dosing device with specified precision on the side of the through current secondary loop protection device0Skipping to execute step 5.4);
5.4) applying an unbalanced current secondary signal to the unbalanced current transformer merging unit by using a direct current protection tester and a standby telecontrol module, and skipping to execute the step 5.5);
5.5) applying an unbalanced current secondary signal with a primary value of 0A, observing a display value of the protection equipment of the alternating current filter, if the display value is consistent with a primary value corresponding to the applied value, carrying out inherent unbalanced current compensation adjustment, eliminating an original inherent unbalanced current compensation value, and skipping to execute the step 5.6);
5.6) after the compensation adjustment of the inherent unbalanced current, gradually increasing the secondary signal of the unbalanced current until the I-section action of the unbalanced protection, and recording the primary current value I corresponding to the secondary signal of the unbalanced current at the moment1If the primary current value I1A first specified multiple which is larger than the action value of the I section of the unbalanced protection and a second specified multiple which is smaller than the action value of the I section of the unbalanced protection jump to execute the step 5.7); otherwise, re-executing the step 5.5); the first specified multiple is less than 1, and the second specified multiple is greater than 1;
5.7) continuously and gradually increasing the secondary unbalanced current signal until the action of the second unbalanced protection section, and recording the primary current value I corresponding to the secondary unbalanced current signal at the moment2If the primary current value I2A first specified multiple which is larger than the action value of the unbalance protection II section and a second specified multiple which is smaller than the action value of the unbalance protection II section jump to execute the step 5.8); otherwise, the operation is resumedStep 5.5) is executed;
5.8) removing the secondary unbalanced current signal until the protection signal returns, and skipping to execute the step 5.9);
5.9) applying an unbalanced current secondary signal, the corresponding primary current value I3Equal to the second designated multiple of the unbalanced protection III section action value, checking whether the unbalanced protection acts instantaneously or not, if the unbalanced protection acts instantaneously, verifying that the original inherent unbalanced current compensation value is eliminated, ending the field experiment, and skipping to execute the step 6); otherwise step 5.5) is re-executed.
Optionally, the specified precision in step 5.3) is 0.05% precision.
Optionally, the first specified multiple is 0.95 times.
Optionally, the second specified multiple is 1.1 times.
In addition, the present invention also provides a system for avoiding the over-compensation of the unbalanced current of the capacitor of the ac filter, comprising:
the first power failure judgment program unit is used for judging whether the high-voltage direct current has power failure or not, and if so, skipping to execute the second power failure judgment program unit; otherwise, skipping to execute the live commissioning program unit without changing the unbalance compensation value;
the second power failure judgment program unit is used for judging whether the alternating current filter to be detected has power failure or not, and if so, skipping to execute the capacitor maintenance inspection program unit; otherwise, skipping to execute the live commissioning program unit without changing the unbalance compensation value;
the capacitor overhauling and checking program unit is used for judging whether the capacitor of the alternating current filter to be detected is adjusted during overhauling, and if so, skipping to execute the first threshold value comparison program unit; otherwise, skipping to execute the live commissioning program unit without changing the unbalance compensation value;
a first threshold value comparison program unit for judging whether the inherent unbalance current compensation value of the alternating current filter to be detected is greater than the threshold value, if so, skipping to execute the unbalance elimination program unit; otherwise, skipping to execute the live commissioning program unit without changing the unbalance compensation value;
the unbalance eliminating program unit is used for eliminating the original inherent unbalance current compensation value by adopting a field experiment method;
the electrified commissioning program unit is used for commissioning the alternating current filter bank to be tested to be electrified;
the second threshold value comparison program unit is used for judging whether the new inherent unbalanced current of the alternating current filter to be detected is larger than the threshold value or not, and if so, skipping execution and quitting the operation program unit; otherwise, skipping to execute the unbalance compensation program unit;
the exit running program unit is used for exiting the detected alternating current filter bank from running and power failure;
a readjusting program unit for readjusting the capacitor capacity of the AC filter bank to be tested and re-executing the live commissioning program unit;
and the unbalance compensation program unit is used for carrying out unbalance current compensation by the protection of the alternating current filter, setting a new unbalance compensation value and ending.
Furthermore, the invention also provides a system for avoiding the over-compensation of the unbalanced current of the capacitor of the alternating current filter, comprising a computer device programmed or configured to execute the steps of the method for avoiding the over-compensation of the unbalanced current of the capacitor of the alternating current filter.
Furthermore, the present invention also provides a system for avoiding an over-compensation of an unbalanced current of a capacitor of an ac filter, comprising a computer device comprising at least a microprocessor and a memory, in which a computer program is stored which is programmed or configured to perform the method for avoiding an over-compensation of an unbalanced current of a capacitor of an ac filter.
Furthermore, the present invention also provides a computer readable storage medium having stored therein a computer program programmed or configured to perform the method of avoiding an over-compensation of an alternating current filter capacitor unbalance current.
Compared with the prior art, the invention has the following beneficial effects: the method comprises the following implementation steps: and eliminating the original inherent unbalanced current compensation value by adopting a field experiment method before commissioning in the annual overhaul period, not carrying out an experiment for eliminating the original unbalanced current compensation value in the high-voltage direct-current operation period, and limiting the unbalanced current compensation value after commissioning the alternating-current filter. According to the invention, the original unbalance current compensation value and the limited compensation value of the capacitor are cleared before the AC filter is put into operation, so that the unbalance current of the capacitor of the AC filter is prevented from being overcompensated, and the protection misoperation risk is reduced.
Drawings
FIG. 1 is a schematic diagram of a basic flow of an exemplary method of the present invention.
Detailed Description
As shown in fig. 1, the method for avoiding the unbalanced current of the capacitor of the ac filter to flow through compensation in the present embodiment includes:
1) judging whether the high-voltage direct current has power failure, and if so, skipping to execute the step 2); otherwise, the unbalance compensation value is not changed, and the step 6) is executed;
2) judging whether the detected AC filter has power failure, if so, skipping to execute the step 3); otherwise, the unbalance compensation value is not changed, and the step 6) is executed;
3) judging whether the capacitor of the alternating current filter to be detected is adjusted during maintenance, and if so, skipping to execute the step 4); otherwise, the unbalance compensation value is not changed, and the step 6) is executed;
4) judging whether the inherent unbalanced current compensation value of the alternating current filter to be detected is larger than a threshold value, and if so, skipping to execute the step 5); otherwise, the unbalance compensation value is not changed, and the step 6) is executed;
5) eliminating original inherent unbalanced current compensation value by using a field experiment method;
6) putting the alternating current filter bank to be detected into operation to be electrified;
7) judging whether the new inherent unbalanced current of the alternating current filter to be detected is larger than a threshold value, and if so, skipping to execute the step 8); otherwise, skipping to execute the step 10);
8) the detected AC filter bank is out of operation and power cut;
9) readjusting the capacitor capacity of the detected alternating current filter bank, and executing the step 6) again;
10) and the protection of the alternating current filter is carried out for unbalance current compensation, a new unbalance compensation value is set, and the process is finished.
In this embodiment, the threshold value in step 4) and step 7) is a difference between the unbalanced protection iii-stage protection action fixed value and the unbalanced protection ii-stage protection action fixed value, that is:
a threshold value is equal to an unbalanced protection III-section protection action fixed value-an unbalanced protection II-section protection action fixed value,
the meaning expressed by the above formula is that before the unbalanced current before compensation reaches the fixed value of the second section, the unbalanced current after compensation can not cause the protection action of the third section.
In this embodiment, the step 5) of eliminating the original inherent unbalanced current compensation value by using a field experiment method includes the following steps:
5.1) removing the optical fiber of the combining unit of the unbalanced current transformer to the telecontrol module, and skipping to execute the step 5.2);
5.2) determining a secondary circuit for measuring the through current of the capacitor, disconnecting the wiring of the transformer side of the through current secondary circuit at the terminal block of an I/O interface cabinet of an alternating current filter protection device (AFP for short), and skipping to execute the step 5.3);
5.3) calculating the rated through current value I when the alternating current filter is put into operation0Applying a secondary signal of a through current corresponding to a primary value equal to a rated through current value I to the I/O interface cabinet terminal block of the AC filter protection device by using a dosing device with specified precision on the side of the through current secondary loop protection device0Skipping to execute step 5.4);
5.4) applying an unbalanced current secondary signal to the unbalanced current transformer merging unit by using a direct current protection tester and a standby telecontrol module, and skipping to execute the step 5.5);
5.5) applying an unbalanced current secondary signal with a primary value of 0A, observing a display value of the protection equipment of the alternating current filter, if the display value is consistent with a primary value corresponding to the applied value, carrying out inherent unbalanced current compensation adjustment, eliminating an original inherent unbalanced current compensation value, and skipping to execute the step 5.6);
5.6) after the compensation adjustment of the inherent unbalanced current, gradually increasing the secondary signal of the unbalanced current untilThe I section of action of unbalanced protection records the primary current value I corresponding to the secondary signal of the unbalanced current at the moment1If the primary current value I1A first specified multiple which is larger than the action value of the I section of the unbalanced protection and a second specified multiple which is smaller than the action value of the I section of the unbalanced protection jump to execute the step 5.7); otherwise, re-executing the step 5.5); the first specified multiple is less than 1, and the second specified multiple is greater than 1;
5.7) continuously and gradually increasing the secondary unbalanced current signal until the action of the second unbalanced protection section, and recording the primary current value I corresponding to the secondary unbalanced current signal at the moment2If the primary current value I2A first specified multiple which is larger than the action value of the unbalance protection II section and a second specified multiple which is smaller than the action value of the unbalance protection II section jump to execute the step 5.8); otherwise, re-executing the step 5.5);
5.8) removing the secondary unbalanced current signal until the protection signal returns, and skipping to execute the step 5.9);
5.9) applying an unbalanced current secondary signal, the corresponding primary current value I3Equal to the second designated multiple of the unbalanced protection III section action value, checking whether the unbalanced protection acts instantaneously or not, if the unbalanced protection acts instantaneously, verifying that the original inherent unbalanced current compensation value is eliminated, ending the field experiment, and skipping to execute the step 6); otherwise step 5.5) is re-executed.
In this embodiment, the specified accuracy in step 5.3) is 0.05% accuracy.
In this embodiment, the first prescribed multiple is 0.95 times.
In this embodiment, the second designated multiple is 1.1 times.
In summary, the present embodiment discloses a method for avoiding an unbalanced current of an ac filter capacitor from being overcompensated, and the method of the present invention includes: 1) eliminating original inherent unbalanced current compensation values by adopting a field experiment method before commissioning in the annual overhaul period, 2) not carrying out an experiment for eliminating the original unbalanced current compensation values in the high-voltage direct-current operation period, and 3) limiting the unbalanced current compensation values after commissioning of the alternating-current filter. According to the invention, the original unbalance current compensation value and the limited compensation value of the capacitor are cleared before the AC filter is put into operation, so that the unbalance current of the capacitor of the AC filter is prevented from being overcompensated, and the protection misoperation risk is reduced.
In addition, the present embodiment further provides a system for avoiding an over-compensation of an unbalanced current of a capacitor of an ac filter, including:
the first power failure judgment program unit is used for judging whether the high-voltage direct current has power failure or not, and if so, skipping to execute the second power failure judgment program unit; otherwise, skipping to execute the live commissioning program unit without changing the unbalance compensation value;
the second power failure judgment program unit is used for judging whether the alternating current filter to be detected has power failure or not, and if so, skipping to execute the capacitor maintenance inspection program unit; otherwise, skipping to execute the live commissioning program unit without changing the unbalance compensation value;
the capacitor overhauling and checking program unit is used for judging whether the capacitor of the alternating current filter to be detected is adjusted during overhauling, and if so, skipping to execute the first threshold value comparison program unit; otherwise, skipping to execute the live commissioning program unit without changing the unbalance compensation value;
a first threshold value comparison program unit for judging whether the inherent unbalance current compensation value of the alternating current filter to be detected is greater than the threshold value, if so, skipping to execute the unbalance elimination program unit; otherwise, skipping to execute the live commissioning program unit without changing the unbalance compensation value;
the unbalance eliminating program unit is used for eliminating the original inherent unbalance current compensation value by adopting a field experiment method;
the electrified commissioning program unit is used for commissioning the alternating current filter bank to be tested to be electrified;
the second threshold value comparison program unit is used for judging whether the new inherent unbalanced current of the alternating current filter to be detected is larger than the threshold value or not, and if so, skipping execution and quitting the operation program unit; otherwise, skipping to execute the unbalance compensation program unit;
the exit running program unit is used for exiting the detected alternating current filter bank from running and power failure;
a readjusting program unit for readjusting the capacitor capacity of the AC filter bank to be tested and re-executing the live commissioning program unit;
and the unbalance compensation program unit is used for carrying out unbalance current compensation by the protection of the alternating current filter, setting a new unbalance compensation value and ending.
In addition, the present embodiment also provides a system for avoiding the over-compensation of the unbalanced current of the capacitor of the ac filter, which includes a computer device programmed or configured to execute the steps of the method for avoiding the over-compensation of the unbalanced current of the capacitor of the ac filter.
In addition, the present embodiment also provides a system for avoiding the over-compensation of the unbalanced current of the capacitor of the ac filter, which includes a computer device at least including a microprocessor and a memory, wherein the memory stores a computer program programmed or configured to execute the method for avoiding the over-compensation of the unbalanced current of the capacitor of the ac filter.
Furthermore, the present embodiment also provides a computer-readable storage medium having stored therein a computer program programmed or configured to perform the aforementioned method of avoiding an over-compensation of an ac filter capacitor unbalance current.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-readable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein. The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks. These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks. These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.

Claims (9)

1. A method for avoiding over-compensation of an unbalanced current in a capacitor of an ac filter, comprising:
1) judging whether the high-voltage direct current has power failure, and if so, skipping to execute the step 2); otherwise, the unbalance compensation value is not changed, and the step 6) is executed;
2) judging whether the detected AC filter has power failure, if so, skipping to execute the step 3); otherwise, the unbalance compensation value is not changed, and the step 6) is executed;
3) judging whether the capacitor of the alternating current filter to be detected is adjusted during maintenance, and if so, skipping to execute the step 4); otherwise, the unbalance compensation value is not changed, and the step 6) is executed;
4) judging whether the inherent unbalanced current compensation value of the alternating current filter to be detected is larger than a threshold value, and if so, skipping to execute the step 5); otherwise, the unbalance compensation value is not changed, and the step 6) is executed;
5) eliminating original inherent unbalanced current compensation value by using a field experiment method;
6) putting the alternating current filter bank to be detected into operation to be electrified;
7) judging whether the new inherent unbalanced current of the alternating current filter to be detected is larger than a threshold value, and if so, skipping to execute the step 8); otherwise, skipping to execute the step 10);
8) the detected AC filter bank is out of operation and power cut;
9) readjusting the capacitor capacity of the detected alternating current filter bank, and executing the step 6) again;
10) the protection of the alternating current filter is carried out for unbalance current compensation, a new unbalance compensation value is set, and the process is finished;
step 5) the method for eliminating the original inherent unbalanced current compensation value by adopting a field experiment method comprises the following steps:
5.1) removing the optical fiber of the combining unit of the unbalanced current transformer to the telecontrol module, and skipping to execute the step 5.2);
5.2) determining a secondary loop for measuring the through current of the capacitor, disconnecting the wiring of the transformer side of the through current secondary loop at the terminal block of the I/O interface cabinet of the alternating current filter protection equipment, and skipping to execute the step 5.3);
5.3) calculating the rated through current value when the alternating current filter is put into operationI 0Applying a secondary signal of a through current corresponding to a primary value equal to a rated through current value to a secondary circuit protection device side of the through current of the I/O interface cabinet terminal block of the AC filter protection device by using a dosing device with specified precisionI 0Skipping to execute step 5.4);
5.4) applying an unbalanced current secondary signal to the unbalanced current transformer merging unit by using a direct current protection tester and a standby telecontrol module, and skipping to execute the step 5.5);
5.5) applying an unbalanced current secondary signal with a primary value of 0A, observing a display value of the protection equipment of the alternating current filter, if the display value is consistent with a primary value corresponding to the applied value, carrying out inherent unbalanced current compensation adjustment, eliminating an original inherent unbalanced current compensation value, and skipping to execute the step 5.6);
5.6) after the compensation adjustment of the inherent unbalanced current, gradually increasing the secondary signal of the unbalanced current until the I-section action of the unbalanced protection, and recording the primary current value corresponding to the secondary signal of the unbalanced current at the momentI 1If the primary current valueI 1A first specified multiple which is larger than the action value of the I section of the unbalanced protection and a second specified multiple which is smaller than the action value of the I section of the unbalanced protection jump to execute the step 5.7); otherwise, re-executing the step 5.5); the first specified multiple is less than 1, and the second specified multiple is greater than 1;
5.7) continuously and gradually increasing the secondary unbalanced current signal until the action of the second unbalanced protection section, and recording the primary current value corresponding to the secondary unbalanced current signal at the momentI 2If the primary current valueI 2A first specified multiple which is larger than the action value of the unbalance protection II section and a second specified multiple which is smaller than the action value of the unbalance protection II section jump to execute the step 5.8); otherwise, re-executing the step 5.5);
5.8) removing the secondary unbalanced current signal until the protection signal returns, and skipping to execute the step 5.9);
5.9) applying an unbalanced current secondary signal, the corresponding primary current valueI 3Equal to the second designated multiple of the unbalanced protection III section action value, checking whether the unbalanced protection acts instantaneously or not, if the unbalanced protection acts instantaneously, verifying that the original inherent unbalanced current compensation value is eliminated, ending the field experiment, and skipping to execute the step 6); otherwise step 5.5) is re-executed.
2. The method according to claim 1, wherein the threshold value in step 4) and step 7) is a difference between a fixed value of the protection action in the third section of the unbalanced protection and a fixed value of the protection action in the second section of the unbalanced protection.
3. Method for avoiding an over-compensation of an unbalanced current of an ac filter capacitor according to claim 1, characterized in that the specified accuracy in step 5.3) is 0.05% accuracy.
4. A method for avoiding over-compensation of an unbalanced current in an ac filter capacitor as recited in claim 1, wherein said first specified multiple is 0.95 times.
5. A method for avoiding over-compensation of an unbalanced current in an ac filter capacitor according to claim 1, wherein the second specified multiple is 1.1 times.
6. A system for avoiding over-compensation of an unbalanced current in a capacitor of an ac filter, comprising:
the first power failure judgment program unit is used for judging whether the high-voltage direct current has power failure or not, and if so, skipping to execute the second power failure judgment program unit; otherwise, skipping to execute the live commissioning program unit without changing the unbalance compensation value;
the second power failure judgment program unit is used for judging whether the alternating current filter to be detected has power failure or not, and if so, skipping to execute the capacitor maintenance inspection program unit; otherwise, skipping to execute the live commissioning program unit without changing the unbalance compensation value;
the capacitor overhauling and checking program unit is used for judging whether the capacitor of the alternating current filter to be detected is adjusted during overhauling, and if so, skipping to execute the first threshold value comparison program unit; otherwise, skipping to execute the live commissioning program unit without changing the unbalance compensation value;
a first threshold value comparison program unit for judging whether the inherent unbalance current compensation value of the alternating current filter to be detected is greater than the threshold value, if so, skipping to execute the unbalance elimination program unit; otherwise, skipping to execute the live commissioning program unit without changing the unbalance compensation value;
the unbalance eliminating program unit is used for eliminating the original inherent unbalance current compensation value by adopting a field experiment method;
the electrified commissioning program unit is used for commissioning the alternating current filter bank to be tested to be electrified;
the second threshold value comparison program unit is used for judging whether the new inherent unbalanced current of the alternating current filter to be detected is larger than the threshold value or not, and if so, skipping execution and quitting the operation program unit; otherwise, skipping to execute the unbalance compensation program unit;
the exit running program unit is used for exiting the detected alternating current filter bank from running and power failure;
a readjusting program unit for readjusting the capacitor capacity of the AC filter bank to be tested and re-executing the live commissioning program unit;
the unbalanced compensation program unit is used for carrying out unbalanced current compensation by the protection of the alternating current filter, setting a new unbalanced compensation value and ending;
the unbalance eliminating program unit adopts a field experiment method to eliminate the original inherent unbalance current compensation value and comprises the following steps:
5.1) removing the optical fiber of the combining unit of the unbalanced current transformer to the telecontrol module, and skipping to execute the step 5.2);
5.2) determining a secondary loop for measuring the through current of the capacitor, disconnecting the wiring of the transformer side of the through current secondary loop at the terminal block of the I/O interface cabinet of the alternating current filter protection equipment, and skipping to execute the step 5.3);
5.3) calculating the rated through current value when the alternating current filter is put into operationI 0Applying a secondary signal of a through current corresponding to a primary value equal to a rated through current value to a secondary circuit protection device side of the through current of the I/O interface cabinet terminal block of the AC filter protection device by using a dosing device with specified precisionI 0Skipping to execute step 5.4);
5.4) applying an unbalanced current secondary signal to the unbalanced current transformer merging unit by using a direct current protection tester and a standby telecontrol module, and skipping to execute the step 5.5);
5.5) applying an unbalanced current secondary signal with a primary value of 0A, observing a display value of the protection equipment of the alternating current filter, if the display value is consistent with a primary value corresponding to the applied value, carrying out inherent unbalanced current compensation adjustment, eliminating an original inherent unbalanced current compensation value, and skipping to execute the step 5.6);
5.6) after the compensation adjustment of the inherent unbalanced current, gradually increasing the secondary signal of the unbalanced current until the I-section action of the unbalanced protection, and recording the primary current value corresponding to the secondary signal of the unbalanced current at the momentI 1If the primary current valueI 1A first specified multiple which is larger than the action value of the I section of the unbalanced protection and a second specified multiple which is smaller than the action value of the I section of the unbalanced protection jump to execute the step 5.7); otherwise, re-executing the step 5.5); the first specified multiple is less than 1, and the second specified multiple is greater than 1;
5.7) continuously and gradually increasing the secondary unbalanced current signal until the action of the second unbalanced protection section, and recording the primary current value corresponding to the secondary unbalanced current signal at the momentI 2If the primary current valueI 2A first specified multiple which is larger than the action value of the unbalance protection II section and a second specified multiple which is smaller than the action value of the unbalance protection II section jump to execute the step 5.8); otherwise, re-executing the step 5.5);
5.8) removing the secondary unbalanced current signal until the protection signal returns, and skipping to execute the step 5.9);
5.9) applying an unbalanced current secondary signal, the corresponding primary current valueI 3Equal to the second designated multiple of the unbalanced protection III section action value, checking whether the unbalanced protection acts instantaneously or not, if the unbalanced protection acts instantaneously, verifying that the original inherent unbalanced current compensation value is eliminated, ending the field experiment, and skipping to execute the step 6); otherwise step 5.5) is re-executed.
7. A system for avoiding overcompensation of an alternating current filter capacitor unbalance current, comprising a computer device, characterized in that the computer device is programmed or configured to perform the steps of the method for avoiding overcompensation of an alternating current filter capacitor unbalance current according to any one of claims 1 to 5.
8. A system for avoiding over-compensation of an unbalanced current of an AC filter capacitor, comprising a computer device comprising at least a microprocessor and a memory, wherein the memory has stored therein a computer program programmed or configured to perform the method for avoiding over-compensation of an unbalanced current of an AC filter capacitor according to any of claims 1 to 5.
9. A computer-readable storage medium having stored thereon a computer program programmed or configured to perform the method of avoiding an over-compensation of an AC filter capacitor imbalance current of any one of claims 1 to 5.
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