CN109030964B - Unbalance degree calculation method without phase measurement in three-phase four-wire system - Google Patents

Unbalance degree calculation method without phase measurement in three-phase four-wire system Download PDF

Info

Publication number
CN109030964B
CN109030964B CN201710428516.XA CN201710428516A CN109030964B CN 109030964 B CN109030964 B CN 109030964B CN 201710428516 A CN201710428516 A CN 201710428516A CN 109030964 B CN109030964 B CN 109030964B
Authority
CN
China
Prior art keywords
phase
voltage component
sequence voltage
unbalance
calculating
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.)
Active
Application number
CN201710428516.XA
Other languages
Chinese (zh)
Other versions
CN109030964A (en
Inventor
徐志鹏
陈劲游
彭昭煌
蔡春元
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.)
Zhongshan Power Supply Bureau of Guangdong Power Grid Co Ltd
Original Assignee
Zhongshan Power Supply Bureau of Guangdong Power Grid Co 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 Zhongshan Power Supply Bureau of Guangdong Power Grid Co Ltd filed Critical Zhongshan Power Supply Bureau of Guangdong Power Grid Co Ltd
Priority to CN201710428516.XA priority Critical patent/CN109030964B/en
Publication of CN109030964A publication Critical patent/CN109030964A/en
Application granted granted Critical
Publication of CN109030964B publication Critical patent/CN109030964B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
    • G01R29/16—Measuring asymmetry of polyphase networks

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Supply And Distribution Of Alternating Current (AREA)
  • Testing Relating To Insulation (AREA)

Abstract

The invention relates to an unbalance degree calculating method without phase measurement in a three-phase four-wire systemThe method comprises the following steps: s1, collecting three phase voltages Ua、Ub、UcAnd any two line voltages Uab、UacBased on Ua、Ub、Uc、Uab、UacCalculating a positive sequence voltage component U in a three-phase system1Negative sequence voltage component U2Zero sequence voltage component U0(ii) a S2, based on positive sequence voltage component U1Negative sequence voltage component U2Zero sequence voltage component U0Calculating the degree of negative sequence unbalance εu2Zero sequence unbalance epsilonu0。

Description

Unbalance degree calculation method without phase measurement in three-phase four-wire system
Technical Field
The invention relates to the technical field of electricity, in particular to an unbalance degree calculation method without phase measurement in a three-phase four-wire system.
Background
The three-phase unbalance is one of the important indexes for measuring the power quality in the three-phase system. In the algorithm given by the national standard GB/T15543-2009 and the international standard IEC-6100-4-27, if the three-phase unbalance is obtained, complex phasor operation is required. The magnitude and phase of each phase voltage need to be measured and phasor calculated to obtain the imbalance. The above method must therefore use a phase measuring device. Meanwhile, when the phase measuring device measures a large phase error, the calculation method has low calculation precision.
Disclosure of Invention
The invention provides the unbalance degree calculation method without phase measurement for solving the defect that the amplitude and the phase of each phase voltage are required to be used in the calculation process of the three-phase unbalance degree calculation method provided by the prior art.
In order to realize the purpose, the technical scheme is as follows:
the method for calculating the unbalance degree without phase measurement in the three-phase four-wire system comprises the following steps of:
s1, collecting three phase voltages Ua、Ub、UcAnd any two line voltages Uab、UacBased on Ua、Ub、Uc、Uab、UacCalculating a positive sequence voltage component U in a three-phase system1Negative sequence voltage component U2Zero sequence voltage component U0；
S2, based on positive sequence voltage component U1Negative sequence voltage component U2Zero sequence voltage component U0Calculating the degree of negative sequence unbalance εU2Zero sequence unbalance epsilonU0：
Figure BDA0001316811650000011
Compared with the prior art, the invention has the beneficial effects that:
the method provided by the invention uses the phase voltage U in the calculation of the unbalance degreea、Ub、UcAnd any two line voltages Uab、UacAnd a phase measuring device is not needed to be used for phase measurement, so that the cost of equipment can be reduced to a certain extent.
Drawings
FIG. 1 is a schematic flow diagram of a method.
Detailed Description
The drawings are for illustrative purposes only and are not to be construed as limiting the patent;
the invention is further illustrated below with reference to the figures and examples.
Example 1
As shown in fig. 1, the method provided by the present invention specifically includes the following steps:
s1, collecting three phase voltages Ua、Ub、UcAnd any two line voltages Uab、UacBased on Ua、Ub、Uc、Uab、UacCalculating a positive sequence voltage component U in a three-phase system1Negative sequence voltage component U2Zero sequence voltage component U0；
S2, based on positive sequence voltage component U1Negative sequence voltage component U2Zero sequence voltage component U0Calculating the degree of negative sequence unbalance εU2Zero sequence unbalance epsilonU0：
Figure BDA0001316811650000021
Example 2
This example compares the calculated positive sequence voltage component U of example 11Negative sequence voltage component U2Zero sequence voltage component U0The specific process specifically includes the following contents:
order to
Figure BDA0001316811650000022
Wherein a, x, y, m, n represent intermediate variables;
Figure BDA0001316811650000023
gy(Ua,Ub,Uab)＝-2S1/a
Figure BDA0001316811650000024
gn(Ua,Uc,Uac)＝-2S2/a
in the above formula, the first and second carbon atoms are,
Figure BDA0001316811650000031
Figure BDA0001316811650000032
namely, it is
Figure BDA0001316811650000033
Wherein
Figure BDA0001316811650000034
Figure BDA0001316811650000035
Figure BDA0001316811650000036
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims (1)

1. The method for calculating the unbalance degree without phase measurement in the three-phase four-wire system is characterized by comprising the following steps of: the method comprises the following steps:
s1, collecting three phase voltages Ua、Ub、UcAnd any two line voltages Uab、UacBased on Ua、Ub、Uc、Uab、UacCalculating a positive sequence voltage component U in a three-phase system1Negative sequence voltage component U2Zero sequence voltage component U0；
S2, based on positive sequence voltage component U1Negative sequence voltage component U2Zero sequence voltage component U0Calculating the degree of negative sequence unbalance εU2Zero sequence unbalance epsilonU0：
Figure FDA0002437314520000011
The step S1 calculates a positive sequence voltage component U1Negative sequence voltage component U2Zero sequence voltage component U0The specific process is as follows:
order to
Figure FDA0002437314520000012
Wherein a, x, y, m, n represent intermediate variables;
Figure FDA0002437314520000013
gy(Ua，Ub，Uab)＝-2S1/a
Figure FDA0002437314520000014
gn(Ua，Uc，Uac)＝-2S2/a
in the above formula, the first and second carbon atoms are,
Figure FDA0002437314520000015
Figure FDA0002437314520000016
namely, it is
Figure FDA0002437314520000021
Wherein
Figure FDA0002437314520000022
Figure FDA0002437314520000023
Figure FDA0002437314520000024
CN201710428516.XA 2017-06-08 2017-06-08 Unbalance degree calculation method without phase measurement in three-phase four-wire system Active CN109030964B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201710428516.XA CN109030964B (en) 2017-06-08 2017-06-08 Unbalance degree calculation method without phase measurement in three-phase four-wire system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201710428516.XA CN109030964B (en) 2017-06-08 2017-06-08 Unbalance degree calculation method without phase measurement in three-phase four-wire system

Publications (2)

Publication Number Publication Date
CN109030964A CN109030964A (en) 2018-12-18
CN109030964B true CN109030964B (en) 2020-06-09

Family

ID=64629508

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201710428516.XA Active CN109030964B (en) 2017-06-08 2017-06-08 Unbalance degree calculation method without phase measurement in three-phase four-wire system

Country Status (1)

Country Link
CN (1) CN109030964B (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109991481B (en) * 2019-03-14 2021-06-08 南京工程学院 Three-phase unbalance measurement method based on sequence components and measurement values
CN110346656B (en) * 2019-05-21 2023-08-11 中国电力科学研究院有限公司 Method and device for determining three-phase voltage unbalance degree of wind turbine generator
CN110850200B (en) * 2019-10-28 2021-07-30 深圳供电局有限公司 Method, estimation device and system for acquiring load current unbalance degree
CN112379217A (en) * 2020-11-06 2021-02-19 山东大学 Fault location method and system based on line voltage measurement
CN117783704A (en) * 2024-02-23 2024-03-29 天津华凯电气有限公司 Three-phase asymmetric monitoring method, device, medium and equipment for bidirectional converter

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101789604A (en) * 2010-03-10 2010-07-28 深圳市禾望电气有限公司 Method for judging severity of grid voltage dip
CN104133189A (en) * 2014-07-15 2014-11-05 广东电网公司中山供电局 Method and device for detecting electric quantity return and supplement error at voltage loss of one phase of three-phase four-wire electric energy meter

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101789604A (en) * 2010-03-10 2010-07-28 深圳市禾望电气有限公司 Method for judging severity of grid voltage dip
CN104133189A (en) * 2014-07-15 2014-11-05 广东电网公司中山供电局 Method and device for detecting electric quantity return and supplement error at voltage loss of one phase of three-phase four-wire electric energy meter

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
三相不平衡度算法的比较研究;周林;《华东电力》;20100228;第38卷(第2期);第0210-0215页 *

Also Published As

Publication number Publication date
CN109030964A (en) 2018-12-18

Similar Documents

Publication Publication Date Title
CN109030964B (en) Unbalance degree calculation method without phase measurement in three-phase four-wire system
CN102735938A (en) Quick detection method of grid voltage fundamental wave positive sequence phase angle
CN102495389B (en) Electrical measurement instrument model calibrating method and system
CN105425171A (en) Method for detecting voltage drop of low voltage ride-through power source of frequency converter
CN105958621A (en) Capacitor bank bridge difference protection unbalance current leveling method
CN108982949A (en) A method of based on line voltage, phase voltage acquiring size its phasor
CN104502703B (en) Electric power signal synchronous phasor measuring method based on Domain Dynamic model
CN103472301A (en) Method and system for extracting positive sequence component and negative sequence component of network voltage
CN105162137A (en) Reactive and harmonic current detection algorithm in complex power network
CN103605038A (en) Protective error detecting and verifying system of electronic current transformer
CN109991481A (en) It is a kind of that method is measured based on the three-phase imbalance of order components and measuring value
CN109188181B (en) Virtual connection judgment method for neutral line of secondary circuit of power grid voltage transformer
CN104020350B (en) A kind of voltage fundamental component detection method overcoming frequency to perturb
Alfonso-Gil et al. Measurement system for a power quality improvement structure based on IEEE Std. 1459
CN105203865B (en) The method of work of the Online Transaction Processing of distributed electrical source grid-connected inverter and electric capacity
CN205384360U (en) BMS current parameter calibrating device
CN109581265B (en) Method for detecting direct current resistance of current transformer based on power error
CN114384312A (en) Method for calculating protective phasor of variable frequency motor
CN107991563B (en) Wind-solar complementary simulation experiment device for power supply and distribution and grid-connected experiment and working method
CN102761132A (en) Method for calculating three-phase susceptance of reactive power compensation circuit
CN104133090B (en) Benefit electricity error detection method and system is moved back during three-phase three-wire electric energy meter decompression
CN103995205B (en) A kind of electric capacity stable state on-line checking method of work and detection device
CN106096278A (en) Train subordinate inverter output calculates method and system
CN105510653A (en) Quadrature signal generator system based on self-adaptive least mean square algorithm
Brusilowicz et al. Reactive power compensation of nonlinear load

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant