MY176033A - Residual voltage computation circuit, power outage determination circuit, and system-linked device - Google Patents

Residual voltage computation circuit, power outage determination circuit, and system-linked device

Info

Publication number
MY176033A
MY176033A MYPI2016703833A MYPI2016703833A MY176033A MY 176033 A MY176033 A MY 176033A MY PI2016703833 A MYPI2016703833 A MY PI2016703833A MY PI2016703833 A MYPI2016703833 A MY PI2016703833A MY 176033 A MY176033 A MY 176033A
Authority
MY
Malaysia
Prior art keywords
phase
negative
positive
axis component
component
Prior art date
Application number
MYPI2016703833A
Inventor
Kunihiko Saiki
Original Assignee
Meidensha Electric Mfg 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 Meidensha Electric Mfg Co Ltd filed Critical Meidensha Electric Mfg Co Ltd
Publication of MY176033A publication Critical patent/MY176033A/en

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
    • 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)
  • Measurement Of Current Or Voltage (AREA)
  • Inverter Devices (AREA)

Abstract

RESIDUAL VOLTAGE COMPUTATION CIRCUIT, POWER OUTAGE DETERMINATION CIRCUIT, AND SYSTEM-LINKED DEVICE By and in a phase synchronization circuit (11), a positive-phase phase (?pos) and a negative-phase phase (?neg) are calculated on the basis of line voltages (Vrs and Vst) of a three-phase system. By and in DQ conversion units (12a,12b), a positive phase D-axis component (Vposd), a positive phase Q-axis component (Vposq), a negative phase D-axis component (Vnegd) and a negative phase Q-axis component (Vnegq) are calculated by performing rotation coordinate transformation of the line voltage (Vrs and Vst)by the positive-phase phase (?pos) and the negative-phase phase (?neg). By and in absolute value calculation units (13a and 13b), a positive phase component absolute value (Vpos) is calculated on the basis of the positive phase D-axis component (Vposd) and the positive phase Q-axis component (Vposq), and a negative phase component absolute value (Vneg) is calculated on the basis of the negative phase D-axis component (Vnegd) and the negative phase Q-axis component (Vnegq). By and in a differentiator (14), an asymmetrical residual voltage (Vdipa), which is a residual voltage that is not dependent on failure aspect upon occurrence of voltage drop, by calculating a difference between the positive phase component absolute value (Vpos) and the negative phase component absolute value (Vneg). With these processes, by and in a circuit interconnected with a three-phase system, the residual voltage can be estimated in any cases of the failure aspects upon occurrence of the voltage drop.
MYPI2016703833A 2014-04-25 2015-03-03 Residual voltage computation circuit, power outage determination circuit, and system-linked device MY176033A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2014090775A JP6269295B2 (en) 2014-04-25 2014-04-25 Residual voltage calculation circuit, power failure judgment circuit, and grid interconnection device

Publications (1)

Publication Number Publication Date
MY176033A true MY176033A (en) 2020-07-22

Family

ID=54332179

Family Applications (1)

Application Number Title Priority Date Filing Date
MYPI2016703833A MY176033A (en) 2014-04-25 2015-03-03 Residual voltage computation circuit, power outage determination circuit, and system-linked device

Country Status (3)

Country Link
JP (1) JP6269295B2 (en)
MY (1) MY176033A (en)
WO (1) WO2015163008A1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106329566B (en) * 2016-08-30 2019-01-29 中国科学院电工研究所 Inverter alternating voltage sensorless control method when network voltage asymmetry
CN107085136A (en) * 2017-03-15 2017-08-22 中国电力科学研究院 A kind of three-phase alternating voltage falls the determination methods and system of state
CN113376424B (en) * 2021-05-20 2022-04-22 国网湖北省电力有限公司电力科学研究院 Voltage sag detection method for cascade type electric energy quality comprehensive treatment device
CN113364060B (en) * 2021-06-04 2022-07-05 国网福建省电力有限公司经济技术研究院 Reactive power control method for direct-drive fan system during asymmetric drop of power grid voltage

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5644346A (en) * 1979-09-17 1981-04-23 Tokyo Shibaura Electric Co Failure detection relay
JP2004156986A (en) * 2002-11-06 2004-06-03 Fuji Electric Fa Components & Systems Co Ltd Power failure detection device
JP4470614B2 (en) * 2004-06-29 2010-06-02 富士電機ホールディングス株式会社 Power failure detection device

Also Published As

Publication number Publication date
JP2015210136A (en) 2015-11-24
WO2015163008A1 (en) 2015-10-29
JP6269295B2 (en) 2018-01-31

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