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 PDFInfo
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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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- 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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/01—Arrangements for reducing harmonics or ripples
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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- 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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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
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:
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:
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.
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:
wherein the content of the first and second substances,is the fundamental voltage;is the fundamental current;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;is the corresponding harmonic voltage;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:
and the fundamental wave capacitive reactance of the passive filter and the reactive compensation device is expressed as follows:
and then, the inductance values of the passive filter and the reactive power compensation device are obtained as follows:
and the capacitance values of the passive filter and the reactive compensation device are as follows:
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)
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:
the filter branch of the filter is connected in parallel with the impedance of the system, and the harmonic current coefficient is expressed as:
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 decompositionFundamental current I1Greater harmonic current (410.42 & 113 deg.A)Harmonic voltage of corresponding orderIf the specific harmonic number h is 7, the inductance and the capacitance of the passive filter obtained by the method are respectively as follows:
further, 10kV system short-circuit capacity Sd555.97MVA, then 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);
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:
the harmonic current coefficient is then expressed as:
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:
wherein the content of the first and second substances,is the fundamental voltage;is the fundamental current;is the harmonic current at a specific harmonic number; h is a specific harmonic number;is the corresponding harmonic voltage;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:
and the fundamental wave capacitive reactance of the passive filter and the reactive compensation device is expressed as follows:
and then, the inductance values of the passive filter and the reactive power compensation device are obtained as follows:
and the capacitance values of the passive filter and the reactive compensation device are as follows:
where f is the fundamental frequency.
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