CN102761132A - Method for calculating three-phase susceptance of reactive power compensation circuit - Google Patents

Method for calculating three-phase susceptance of reactive power compensation circuit Download PDF

Info

Publication number
CN102761132A
CN102761132A CN2012102550596A CN201210255059A CN102761132A CN 102761132 A CN102761132 A CN 102761132A CN 2012102550596 A CN2012102550596 A CN 2012102550596A CN 201210255059 A CN201210255059 A CN 201210255059A CN 102761132 A CN102761132 A CN 102761132A
Authority
CN
China
Prior art keywords
phase
compensation circuit
susceptance
reactive power
power compensation
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN2012102550596A
Other languages
Chinese (zh)
Inventor
张华军
陈方元
褚学征
尉强
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Wisdri Engineering and Research Incorporation Ltd
Original Assignee
Wisdri Engineering and Research Incorporation Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Wisdri Engineering and Research Incorporation Ltd filed Critical Wisdri Engineering and Research Incorporation Ltd
Priority to CN2012102550596A priority Critical patent/CN102761132A/en
Publication of CN102761132A publication Critical patent/CN102761132A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • 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

Landscapes

  • Supply And Distribution Of Alternating Current (AREA)

Abstract

The present invention relates to a kind of three-phase electrical susceptance of reactive compensation circuit calculation methods, specifically: (1) measuring A phase bus voltage amplitude U, unit volt; (2) A, B, C threephase load electric current are measured , , , unit ampere; (3) compensation circuit three-phase susceptance is calculated ,
Figure DEST_PATH_IMAGE010
,
Figure DEST_PATH_IMAGE012
; By above-mentioned steps, the calculating to three-phase electrical susceptance of reactive compensation circuit is realized. The present invention obtains electric current positive sequence negative phase-sequence zero-sequence component according to symmetrical component method and derives acquisition reactive power compensation circuit three-phase admittance value, being capable of accurate compensation load three-phase imbalance.

Description

Reactive power compensation circuit three-phase susceptance computational methods
Technical field
The present invention relates to power system reactive power compensation and harmonic wave control field in the iron and steel metallurgical industry, relate in particular to a kind of reactive power compensation circuit three-phase susceptance computational methods.
Background technology
In the Ferrous Metallurgy electric power system because the influence of impact loads such as milling train, arc furnace; Cause electric power system to have the three-phase imbalance phenomenon; When the load of this dynamic change is compensated; Can not adopt conventional method that the three-phase compensating circuit is carried out same admittance adjustment, and need carry out corresponding adjustment separately according to each circuitry phase susceptance of load.
Therefore, be necessary to provide a kind of novel method, so that overcome the defective that traditional method exists.
Summary of the invention
Technical problem to be solved by this invention is: a kind of reactive power compensation circuit three-phase susceptance computational methods are provided, and this method can accurately calculate each phase susceptance value of compensating circuit according to load.
The present invention solves its technical problem and adopts following technical scheme:
Reactive power compensation circuit three-phase susceptance computational methods provided by the invention, specifically:
(1) measures A phase busbar voltage amplitude U, unit volt;
(2) measure A, B, C threephase load electric current
Figure 2012102550596100002DEST_PATH_IMAGE001
,
Figure 346452DEST_PATH_IMAGE002
,
Figure 2012102550596100002DEST_PATH_IMAGE003
, unit ampere;
(3) according to the following formula to calculate the phase compensation circuit susceptance ,
Figure 2012102550596100002DEST_PATH_IMAGE005
,
Figure 327363DEST_PATH_IMAGE006
:
Figure 2012102550596100002DEST_PATH_IMAGE007
，
In the formula: U is the three-phase voltage effective value; The imaginary part of symbol " Im " expression plural number,
Figure 662530DEST_PATH_IMAGE008
;
Through above-mentioned steps, realize calculating to reactive power compensation circuit three-phase susceptance.
In calculating reactive power compensation circuit three-phase susceptance process, as long as load does not change, the compensating circuit three-phase susceptance that is drawn just remains unchanged.
It compared with prior art has following main advantage the present invention:
Obtain the derivation of electric current positive sequence negative phase-sequence zero-sequence component according to symmetrical component method and obtain reactive power compensation circuit three-phase admittance value, accurately compensating load three-phase imbalance.
Description of drawings
Fig. 1 is for utilizing the principle of reactor, capacitor compensation reactive power in the three-phase circuit system.
Fig. 2 is A, B, C three-phase current curve.
Embodiment
Below in conjunction with embodiment and accompanying drawing the present invention is described further, but does not limit the present invention.
Embodiment 1: reactive power compensation circuit three-phase susceptance computational methods
Present embodiment 1 adopts the method that may further comprise the steps:
At first; Utilize reactor in the three-phase circuit system; The principle of capacitor compensation reactive power is as shown in Figure 1; A wherein; B; The C phase voltage is respectively
Figure 2012102550596100002DEST_PATH_IMAGE009
;
Figure 984927DEST_PATH_IMAGE010
;
Figure 2012102550596100002DEST_PATH_IMAGE011
;
Figure 532583DEST_PATH_IMAGE012
; ;
Figure 624035DEST_PATH_IMAGE014
is respectively the admittance between mutually of A and B in the load system; B and the C admittance between mutually; C and the A admittance between mutually;
Figure 2012102550596100002DEST_PATH_IMAGE015
;
Figure 395682DEST_PATH_IMAGE016
; is respectively the admittance between mutually of A and B in the bucking-out system; B and the C admittance between mutually; C and the A admittance between mutually
Three-phase voltage satisfies following relational expression:
Figure 815162DEST_PATH_IMAGE018
（1）
In the formula: U is the three-phase voltage effective value, writes for ease following to be write a Chinese character in simplified form into U.
Load triple line electric current is respectively:
Figure 291143DEST_PATH_IMAGE020
（2）
According to the symmetrical component principle, can get load current A phase positive sequence component , negative sequence component , zero-sequence component
Figure 2012102550596100002DEST_PATH_IMAGE023
and be:
Figure 55017DEST_PATH_IMAGE024
（3）
In like manner, can get load current B phase positive sequence component
Figure 2012102550596100002DEST_PATH_IMAGE025
, negative sequence component
Figure 492951DEST_PATH_IMAGE026
, zero-sequence component
Figure 2012102550596100002DEST_PATH_IMAGE027
is:
Figure 507044DEST_PATH_IMAGE028
（4）
C-phase load current positive sequence component
Figure 2012102550596100002DEST_PATH_IMAGE029
, negative sequence component
Figure 448455DEST_PATH_IMAGE030
, zero-sequence component
Figure 2012102550596100002DEST_PATH_IMAGE031
is:
Figure 561904DEST_PATH_IMAGE032
（5）
Relatively formula (3)-(5) can know that the every phase negative-sequence current of load satisfies following relation:
Figure 2012102550596100002DEST_PATH_IMAGE033
（6）
Analyzing formula (6) can know, as long as A phase load negative-sequence current component is zero, then B phase and C phase load electric current negative sequence component are zero too.Therefore, consider that only need A phase negative-sequence current component be adjusted into zero when reactive power compensation transposition three-phase susceptance calculates just can realize that whole three-phase electric power system negative sequence component is zero.
In conjunction with formula (2) and (3) can know reactive power compensator A mutually positive sequence, negative phase-sequence, zero-sequence component can use following equation expression:
Figure 80610DEST_PATH_IMAGE034
（7）
Figure 304918DEST_PATH_IMAGE004
in the formula (7);
Figure 366415DEST_PATH_IMAGE005
;
Figure 119608DEST_PATH_IMAGE006
is compensating circuit A; B; Susceptance between the C three-phase.According to above-mentioned analysis,, then satisfy following relation if electric power system A phase current negative sequence component is zero:
（8）
In the compensation negative-sequence current component, reactive power compensator also need be adjusted into 1 with the electric power system power factor simultaneously, and therefore, A circuitry phase forward-order current component satisfies following relation:
Figure 532134DEST_PATH_IMAGE036
（9）
The imaginary part of oeprator " Im " the expression plural number in the formula (9).Simultaneous formula (8), (9) can get following relational expression:
Figure 2012102550596100002DEST_PATH_IMAGE037
（10）
Formula (3) substitution formula (10) can be got
Figure 153609DEST_PATH_IMAGE007
（11）
According to above-mentioned analysis, it is following to calculate reactive power compensation circuit three-phase susceptance step:
(1) measures A phase busbar voltage amplitude U;
(2) measure A, B, C threephase load electric current
Figure 335191DEST_PATH_IMAGE001
, ,
Figure 893529DEST_PATH_IMAGE003
; Its curve is seen Fig. 2; Can know that by Fig. 2 the three-phase current amplitude has nothing in common with each other, and exists the threephase load energy imbalance.
(3) according to the formula (11) for calculating compensation circuit three-phase electrical admittance
Figure 459639DEST_PATH_IMAGE004
,
Figure 354783DEST_PATH_IMAGE005
,
Figure 715357DEST_PATH_IMAGE006
.
Embodiment 2
Present embodiment 2 is an example with a load system on domestic certain 6.5kV of steel mill bus, comes the present invention is described further.
Through measuring; Three-phase current on the 6.5kV of this steel mill bus is respectively
Figure 102476DEST_PATH_IMAGE038
;
Figure 941119DEST_PATH_IMAGE040
。
With
Figure 831715DEST_PATH_IMAGE008
,
Figure 2012102550596100002DEST_PATH_IMAGE041
substitution formula can get following result in (11):
Figure 222245DEST_PATH_IMAGE042
（12）
Formula (12) is got imaginary part can be got:
Figure 2012102550596100002DEST_PATH_IMAGE043
（13）
Can be calculated according to the above-mentioned phase compensation circuit susceptance
Figure 831080DEST_PATH_IMAGE004
,
Figure 473414DEST_PATH_IMAGE005
, is:
。
Can know by calculating compensating circuit three-phase susceptance in the foregoing description 2; Reactive power compensation circuit three-phase susceptance computational methods provided by the invention can utilize the current amplitude that measures and phase place carry out simple matrix multiple can obtain accurately the three-phase compensation point by, satisfy the demand of compensation precision and computational speed fully.

Claims (2)

1. reactive power compensation circuit three-phase susceptance computational methods is characterized in that:
(1) measures A phase busbar voltage amplitude U, unit volt;
(2) measure A, B, C threephase load electric current
Figure 2012102550596100001DEST_PATH_IMAGE002
,
Figure 2012102550596100001DEST_PATH_IMAGE004
,
Figure 2012102550596100001DEST_PATH_IMAGE006
, unit ampere;
(3) according to the following formula to calculate the phase compensation circuit susceptance
Figure 2012102550596100001DEST_PATH_IMAGE008
,
Figure 2012102550596100001DEST_PATH_IMAGE010
,
Figure 2012102550596100001DEST_PATH_IMAGE012
:
Figure 2012102550596100001DEST_PATH_IMAGE014
，
In the formula: U is the three-phase voltage effective value; The imaginary part of symbol " Im " expression plural number, ;
Through above-mentioned steps, realize calculating to reactive power compensation circuit three-phase susceptance.
2. reactive power compensation circuit three-phase susceptance computational methods according to claim 1 is characterized in that the compensating circuit three-phase susceptance that is drawn just remains unchanged as long as load does not change.
CN2012102550596A 2012-07-23 2012-07-23 Method for calculating three-phase susceptance of reactive power compensation circuit Pending CN102761132A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2012102550596A CN102761132A (en) 2012-07-23 2012-07-23 Method for calculating three-phase susceptance of reactive power compensation circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2012102550596A CN102761132A (en) 2012-07-23 2012-07-23 Method for calculating three-phase susceptance of reactive power compensation circuit

Publications (1)

Publication Number Publication Date
CN102761132A true CN102761132A (en) 2012-10-31

Family

ID=47055489

Family Applications (1)

Application Number Title Priority Date Filing Date
CN2012102550596A Pending CN102761132A (en) 2012-07-23 2012-07-23 Method for calculating three-phase susceptance of reactive power compensation circuit

Country Status (1)

Country Link
CN (1) CN102761132A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104377711A (en) * 2014-11-24 2015-02-25 国网四川省电力公司遂宁供电公司 Dynamic reactive power compensation method
CN104953602A (en) * 2014-08-22 2015-09-30 广东天月德电力科技有限公司 Optimization method of automatic balance adjusting parameter of three-phase load
CN112398149A (en) * 2020-11-04 2021-02-23 国网北京市电力公司 Load compensation method and system based on superposition principle

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
童国力等: "基于对称分量法的负荷补偿新方法", 《太原理工大学学报》 *
翟莎: "平衡不对称负荷的静止无功补偿器的研究", 《中国优秀硕士学位论文全文数据库》 *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104953602A (en) * 2014-08-22 2015-09-30 广东天月德电力科技有限公司 Optimization method of automatic balance adjusting parameter of three-phase load
CN104953602B (en) * 2014-08-22 2018-06-19 广东天月德电力科技有限公司 A kind of optimization method of threephase load Automatic Balance Regulation parameter
CN104377711A (en) * 2014-11-24 2015-02-25 国网四川省电力公司遂宁供电公司 Dynamic reactive power compensation method
CN104377711B (en) * 2014-11-24 2016-08-24 国网四川省电力公司遂宁供电公司 A kind of dynamic reactive compensating method
CN112398149A (en) * 2020-11-04 2021-02-23 国网北京市电力公司 Load compensation method and system based on superposition principle

Similar Documents

Publication Publication Date Title
KR101998916B1 (en) Frequency-conversion differential protection method for output transformer of static frequency convertor system
CN102735938A (en) Quick detection method of grid voltage fundamental wave positive sequence phase angle
CN205910263U (en) Earth -free distribution network capacitance current measurement system of neutral point
CN100508325C (en) Three-phase unbalance load compensation method
CN105140927B (en) The computational methods of distribution network var compensation condenser capacity containing harmonic wave
CN104730416A (en) Electric transmission line single-terminal ranging method with sudden change of current as polarizing quantity
CN111600318B (en) Current detection method for realizing target three-phase unbalance
CN102403721A (en) Method for adjusting super real-time coincidence time sequence based on transient power angle stability margin
CN102738790A (en) Method for calculating positive sequence, negative sequence and zero sequence components of current in power system
CN102761132A (en) Method for calculating three-phase susceptance of reactive power compensation circuit
CN103926451A (en) Extracting method of reference voltage of dynamic voltage restorer in isolated neutral system
CN103424622A (en) Detecting and determining method of fractional harmonic source
CN105610145B (en) Power feedback active full-harmonic arc extinction control method and system
Orts-Grau et al. Discussion on useless active and reactive powers contained in the IEEE standard 1459
Segui-Chilet et al. Approach to unbalance power active compensation under linear load unbalances and fundamental voltage asymmetries
CN104917458A (en) Method and circuit for detecting output current in absence of sensor
CN104678219A (en) Capacitance compensation matching method based on high-current test system
Al-Naimi et al. Fast detection technique for voltage unbalance in three-phase power system
CN106981880B (en) Quantitative calculation method for unbalanced responsibility at public coupling point in power distribution system
CN110120655A (en) A kind of frequency-tracking system and method for frequency converter back end current channel
CN104730417B (en) It is a kind of using negative-sequence current as the transmission line of electricity method of single end distance measurement of amount of polarization
CN110137925A (en) The method for adjusting the neutral point displacement voltage of grounding transformer
CN106571623A (en) Static synchronous compensator compensation current detection method
CN209562144U (en) A kind of frequency tracking apparatus for frequency converter back end current channel
CN105242174B (en) Based on impedance mapping function amplitude characteristic line single phase grounding failure distance measuring method

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C02 Deemed withdrawal of patent application after publication (patent law 2001)
WD01 Invention patent application deemed withdrawn after publication

Application publication date: 20121031