CN109116138B - Parameter online measurement method for passive filter and reactive compensation device - Google Patents

Parameter online measurement method for passive filter and reactive compensation device Download PDF

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CN109116138B
CN109116138B CN201810757725.3A CN201810757725A CN109116138B CN 109116138 B CN109116138 B CN 109116138B CN 201810757725 A CN201810757725 A CN 201810757725A CN 109116138 B CN109116138 B CN 109116138B
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compensation device
passive filter
harmonic
voltage
current
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CN109116138A (en
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曾庆松
秦勇
李婷
白杰
丁留宝
潘冬寅
朱明星
陈中跃
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Guizhou Wanfeng Electric Power Co ltd
Anhui University
Nari Technology Co Ltd
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Guizhou Wanfeng Electric Power Co ltd
Anhui University
Nari Technology Co Ltd
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    • 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
    • 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
    • H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in 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
    • Y02E40/30—Reactive power compensation
    • 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

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  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
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Abstract

The invention discloses a parameter online measurement method of a passive filter and a reactive compensation device, which comprises the steps of firstly, online measuring the voltage and the current of a branch circuit of the passive filter and the reactive compensation device to be detected; performing single-cycle Fourier analysis on the measured voltage and current, and respectively calculating fundamental voltage, fundamental current, and each integer harmonic voltage and harmonic current; and obtaining the inductance value and the capacitance value of the passive filter and the reactive compensation device according to the obtained fundamental voltage, fundamental current, and harmonic voltage and harmonic current under the specific harmonic times. The method can simply and quickly obtain the operation parameters of the passive filter and the reactive power compensation device, so that the state analysis can be carried out on the passive filter and the reactive power compensation device, and the safe and stable operation of the device can be ensured.

Description

Parameter online measurement method for passive filter and reactive compensation device
Technical Field
The invention relates to the technical field of harmonic filtering and reactive power compensation of an electric power system, in particular to a parameter online measurement method of a passive filter and a reactive power compensation device.
Background
With the rapid development of power electronic technology, the application of power electronic devices is becoming more and more extensive, so that harmonic and reactive problems are attracting more and more attention. The passive filter and the reactive compensation device mainly inhibit harmonic waves and reactive power problems, and in recent years, the problems that the passive filter or the reactive compensation device has operation faults and even electric power accidents in various national large power grids for many times, such as the accidents of reactor burning in Hubei Yuxian transformer substations, and the like, are solved, and the problems that the reactive compensation device has more problems in the links of design parameter selection, equipment structure design, installation and the like are exposed.
In practical engineering application, many users cannot provide actual parameters of the passive filter and the reactive compensation device, which brings unnecessary troubles for technical transformation or parameter optimization of the passive filter and the reactive compensation device, and the prior art is lack of such a solution.
Disclosure of Invention
The invention aims to provide a parameter online measurement method for a passive filter and a reactive power compensation device, which can simply and quickly obtain the operation parameters of the passive filter and the reactive power compensation device, so that the state analysis can be carried out on the passive filter and the reactive power compensation device to ensure the safe and stable operation of the device.
The purpose of the invention is realized by the following technical scheme:
a method for online parameter measurement of a passive filter and a reactive power compensation device, the method comprising:
step 1, measuring the voltage and current of a passive filter to be detected and a reactive compensation device branch on line;
step 2, performing single-cycle Fourier analysis on the measured voltage and current, and respectively calculating fundamental voltage, fundamental current, and each integer harmonic voltage and harmonic current;
and 3, obtaining the inductance value and the capacitance value of the passive filter and the reactive power compensation device according to the obtained fundamental voltage, fundamental current and harmonic voltage and harmonic current under the specific harmonic times.
According to the technical scheme provided by the invention, the method can simply and quickly obtain the operation parameters of the passive filter and the reactive power compensation device, so that the state analysis can be carried out on the passive filter and the reactive power compensation device, and the safe and stable operation of the device can be ensured.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
Fig. 1 is a schematic flow chart of a parameter online measurement method for a passive filter and a reactive compensation device according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an online measurement test point provided in an embodiment of the present invention;
FIG. 3 is a diagram of a power distribution system impedance model provided by an embodiment of the present invention;
fig. 4 is a schematic diagram of harmonic current coefficients obtained by simulation in an example according to the embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the present invention will be further described in detail with reference to the accompanying drawings, and as shown in fig. 1, a schematic flow chart of a parameter online measurement method for a passive filter and a reactive power compensation device provided by the embodiment of the present invention is shown, where the method includes:
step 1, measuring the voltage and current of a passive filter to be detected and a reactive compensation device branch on line;
as shown in fig. 2, which is a schematic diagram of an online measurement test point provided in the embodiment of the present invention, in a specific implementation, if the voltages and currents of the passive filter and the reactive compensation device branch cannot be directly measured, for example, the field conditions are not allowed (i.e., the voltages and currents of the passive filter and the reactive compensation device branch cannot be measured), the voltages and currents of the passive filter and the reactive compensation device branch are obtained by measuring the voltage and current data of the main incoming line and the load feeder line and performing phasor superposition.
Step 2, performing single-cycle Fourier analysis on the measured voltage and current, and respectively calculating fundamental voltage, fundamental current, and each integer harmonic voltage and harmonic current;
and 3, obtaining the inductance value and the capacitance value of the passive filter and the reactive power compensation device according to the obtained fundamental voltage, fundamental current and harmonic voltage and harmonic current under the specific harmonic times.
The process of the step specifically comprises the following steps:
the passive filter and the reactive power compensation device satisfy the following two relations under the conditions of fundamental wave and h harmonic wave:
Figure BDA0001727118890000031
wherein the content of the first and second substances,
Figure BDA0001727118890000032
is the fundamental voltage;
Figure BDA0001727118890000033
is the fundamental current;
Figure BDA0001727118890000034
the harmonic current at a specific harmonic order (in the present embodiment, the harmonic current may be a relatively large value); h is a specific harmonic number;
Figure BDA0001727118890000035
is the corresponding harmonic voltage;
Figure BDA0001727118890000036
is a virtual unit.
Further, the fundamental wave inductive reactance of the passive filter and the reactive power compensation device is obtained and expressed as:
Figure BDA0001727118890000037
and the fundamental wave capacitive reactance of the passive filter and the reactive compensation device is expressed as follows:
Figure BDA0001727118890000038
and then, the inductance values of the passive filter and the reactive power compensation device are obtained as follows:
Figure BDA0001727118890000039
and the capacitance values of the passive filter and the reactive compensation device are as follows:
Figure BDA00017271188900000310
where f is the fundamental frequency.
In addition, after obtaining the inductance and capacitance values of the passive filter and the reactive compensation device, the method further includes:
constructing a system harmonic impedance model according to the obtained inductance value, capacitance value and system impedance;
and performing harmonic current coefficient simulation according to the established system harmonic impedance model, and analyzing the running state of the passive filter and the reactive power compensation device.
The process of building the system harmonic impedance model specifically comprises the following steps:
setting the rated voltage of a bus where the passive filter and the reactive power compensation device are positioned as UNBus short circuit capacity of SdThen the system impedance is expressed as:
zSh＝hRS+(hRP//jhXs)
wherein the content of the first and second substances,
Figure BDA0001727118890000041
RP＝40XS
h in the formula is a specific harmonic number; xS、RS、RpIs a system impedance parameter.
Then at the h harmonic the impedance of the passive filter and reactive compensation device is expressed as:
Figure BDA0001727118890000042
the filter branch of the filter is connected in parallel with the impedance of the system, and the harmonic current coefficient is expressed as:
Figure BDA0001727118890000043
in the above formula IhH harmonic currents generated for nonlinear loads; i isshIs h harmonic current flowing into the system; zlhImpedance of a passive filter or a reactive compensation device; zshIs the system impedance.
Then obtaining a series resonance point in the harmonic current coefficient according to the expression of the harmonic current coefficient;
if the passive filter is to be detected, comparing the series resonance point with the actually designed tuning times of the passive filter; if the reactive compensation device is to be detected, comparing the series resonance point with the tuning times corresponding to the series reactance rate of the reactive compensation device;
if the difference between the two is large, judging that the running state of the passive filter or the reactive power compensation device to be detected is not good;
and if the two are close, judging that the running state of the passive filter or the reactive power compensation device to be detected is good.
The above process is described in detail with reference to specific examples, the numerical values used in this example are only examples, and a user may make corresponding changes according to actual requirements.
Measuring voltage u and current i at 10kV bus side, and obtaining fundamental voltage through single-cycle Fourier decomposition
Figure BDA0001727118890000044
Fundamental current I1Greater harmonic current (410.42 & 113 deg.A)
Figure BDA0001727118890000045
Harmonic voltage of corresponding order
Figure BDA0001727118890000046
If the specific harmonic number h is 7, the inductance and the capacitance of the passive filter obtained by the method are respectively as follows:
Figure BDA0001727118890000047
Figure BDA0001727118890000048
further, 10kV system short-circuit capacity Sd555.97MVA, then
Figure BDA0001727118890000049
Figure BDA0001727118890000051
RPFig. 3 shows an impedance model diagram of a power distribution system provided in an embodiment of the present invention, the obtained parameters are substituted into the impedance model shown in fig. 3, and a harmonic current coefficient obtained through simulation is shown in fig. 4, where the passive filter mainly filters 7-th harmonic current (according to the design and application guide rule of the GBT 26868-2011 high-voltage filter device, the actual tuning frequency is α h), and the number of series resonance in actual simulation is 6.95, and since the number of series resonance is very close to the number of filtering times of the passive filter, it is determined that the resonance point of the passive filter device is set reasonably, the device has no aging problem, and the operation effect is better, and it needs to be noted that the passive filter amplifies 5.61-th harmonic current most obviously, which reaches 24.81 times.
It is noted that those skilled in the art will recognize that embodiments of the present invention are not described in detail herein.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (3)

1. A method for online parameter measurement of a passive filter and a reactive power compensation device is characterized by comprising the following steps:
step 1, measuring the voltage and current of a passive filter to be detected and a reactive compensation device branch on line;
step 2, performing single-cycle Fourier analysis on the measured voltage and current, and respectively calculating fundamental voltage, fundamental current, and each integer harmonic voltage and harmonic current;
step 3, obtaining the inductance value and the capacitance value of the passive filter and the reactive power compensation device according to the obtained fundamental voltage, fundamental current and harmonic voltage and harmonic current under the specific harmonic times;
further, after obtaining the inductance and capacitance values of the passive filter and the reactive compensation device, the method further includes:
constructing a system harmonic impedance model according to the obtained inductance value, capacitance value and system impedance; performing harmonic current coefficient simulation according to the established system harmonic impedance model, and analyzing the running state of the passive filter and the reactive power compensation device;
the process of building the system harmonic impedance model specifically comprises the following steps:
setting the rated voltage of a bus where the passive filter and the reactive power compensation device are positioned as UNBus short circuit capacity of SdThen the system impedance is expressed as:
zSh＝hRS+(hRP//jhXs)；
wherein the content of the first and second substances,
Figure FDA0002701612550000011
RP＝40XS；
h in the formula is a specific harmonic number; xS、RS、RpIs a system impedance parameter;
then at the h harmonic the impedance of the passive filter and reactive compensation device is expressed as:
Figure FDA0002701612550000012
the harmonic current coefficient is then expressed as:
Figure FDA0002701612550000013
wherein, IhH harmonic currents generated for nonlinear loads; i isshIs h harmonic current flowing into the system; zlhImpedance of the passive filter and the reactive compensation device; zshIs the system impedance;
based on the established model, the process of analyzing the running state of the passive filter and the reactive power compensation device specifically comprises the following steps:
obtaining a series resonance point in the harmonic current coefficient according to the expression of the harmonic current coefficient;
if the passive filter is to be detected, comparing the series resonance point with the actually designed tuning times of the passive filter; if the reactive compensation device is to be detected, comparing the series resonance point with the tuning times corresponding to the series reactance rate of the reactive compensation device;
if the difference between the two is large, judging that the running state of the passive filter or the reactive power compensation device to be detected is not good; and if the two are close, judging that the running state of the passive filter or the reactive power compensation device to be detected is good.
2. The method for online measuring the parameters of the passive filter and the reactive power compensation device according to claim 1, wherein in step 1, if the voltage and the current of the passive filter and the reactive power compensation device branch cannot be directly measured, the voltage and the current of the passive filter and the reactive power compensation device branch are obtained by measuring the voltage and the current data of the main incoming line and the load feeder line and then performing phasor superposition.
3. The method for online measuring the parameters of the passive filter and the reactive power compensation device according to claim 1, wherein the process of step 3 specifically comprises:
the passive filter and the reactive power compensation device satisfy the following two relations under the conditions of fundamental wave and h harmonic wave:
Figure FDA0002701612550000021
wherein the content of the first and second substances,
Figure FDA0002701612550000022
is the fundamental voltage;
Figure FDA0002701612550000023
is the fundamental current;
Figure FDA0002701612550000024
is the harmonic current at a specific harmonic number; h is a specific harmonic number;
Figure FDA0002701612550000025
is the corresponding harmonic voltage;
Figure FDA0002701612550000026
is a virtual unit;
further, the fundamental wave inductive reactance of the passive filter and the reactive power compensation device is obtained and expressed as:
Figure FDA0002701612550000027
and the fundamental wave capacitive reactance of the passive filter and the reactive compensation device is expressed as follows:
Figure FDA0002701612550000028
and then, the inductance values of the passive filter and the reactive power compensation device are obtained as follows:
Figure FDA0002701612550000029
and the capacitance values of the passive filter and the reactive compensation device are as follows:
Figure FDA0002701612550000031
where f is the fundamental frequency.
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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201341025Y (en) * 2008-12-04 2009-11-04 镇江中茂电子科技有限公司 Active power filtering and reactive power compensation device of distribution network
CN103199533A (en) * 2013-03-13 2013-07-10 南方电网科学研究院有限责任公司 Passive filter optimal design method based on two-point type working condition
CN104007321A (en) * 2014-06-17 2014-08-27 华北电力大学（保定） Method for online identification of parameters of reactive compensation capacitor bank
CN104362645A (en) * 2014-10-27 2015-02-18 西安交通大学 Active harmonic wave resistance control method of reactive compensation capacitor based on injection type
CN105140927A (en) * 2015-07-13 2015-12-09 四川大学 Capacity calculating method for power distribution network reactive compensation capacitor containing harmonic waves
CN105914760A (en) * 2016-06-22 2016-08-31 西安华瑞网电设备有限公司 Distribution network reactive power compensation control method and device capable of suppressing resonance

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5539651A (en) * 1993-12-09 1996-07-23 Long Island Lighting Company Apparatus and method for determining the effects of harmonics on electric power systems
US8868364B2 (en) * 2011-04-29 2014-10-21 Analog Devices, Inc. Apparatus and method for real time harmonic spectral analyzer

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201341025Y (en) * 2008-12-04 2009-11-04 镇江中茂电子科技有限公司 Active power filtering and reactive power compensation device of distribution network
CN103199533A (en) * 2013-03-13 2013-07-10 南方电网科学研究院有限责任公司 Passive filter optimal design method based on two-point type working condition
CN104007321A (en) * 2014-06-17 2014-08-27 华北电力大学（保定） Method for online identification of parameters of reactive compensation capacitor bank
CN104362645A (en) * 2014-10-27 2015-02-18 西安交通大学 Active harmonic wave resistance control method of reactive compensation capacitor based on injection type
CN105140927A (en) * 2015-07-13 2015-12-09 四川大学 Capacity calculating method for power distribution network reactive compensation capacitor containing harmonic waves
CN105914760A (en) * 2016-06-22 2016-08-31 西安华瑞网电设备有限公司 Distribution network reactive power compensation control method and device capable of suppressing resonance

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
无功补偿电容器组参数在线辨识方法;牛胜锁等;《电力自动化设备》;20151130;第35卷(第11期);123-128 *

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