Control method and control circuit of three-phase four-wire system static VAR generator

A three-phase four-wire system, static var technology, applied in circuit devices, AC network circuits, reactive power adjustment/elimination/compensation, etc., can solve the problems of poor compensation accuracy, increased output current distortion rate, power grid harmonics pollution and other issues
CN107994589APending Publication Date: 2018-05-04深圳市海思瑞科电气技术有限公司
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
深圳市海思瑞科电气技术有限公司
Publication Date
2018-05-04

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Abstract

The invention discloses a control method and a control circuit of a three-phase four-wire system static VAR generator. The control method includes respectively subjecting 0-axis rotational coordinateinductance real-time current value and 0-axis current directive value to robust control algorithm and repetitive control algorithm to obtain 0-axis current loop control output value; subjecting d-axiscurrent loop and q-axis current loop to PI control algorithm respectively to obtain d-axis current loop control output value and q-axis current loop control output value; calculating to obtain rotational coordinate modulation wave real-time value according to the d-axis current loop output value, the q-axis current loop control output value, the 0-axis current loop control output value, power grid voltage fundamental wave positive sequence angular velocity, rotational coordinate power grid real-time voltage value and the rotational coordinate inductance real-time current value, generating a real-time modulation signal by means of reverse-Park transform algorithm according to the rotational coordinate modulation wave real-time value and the power grid voltage fundamental wave positive sequence angular velocity, and according to the real-time modulation signal, effectively suppressing neutral conductor current harmonics injected into the power grid from the three-phase four-wire systemstatic VAR generator.
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Description

technical field

[0001] The invention relates to the technical field of reactive power compensation for distribution networks, in particular to a control method and a control circuit for a three-phase four-wire static var generator. Background technique

[0002] The three-phase four-wire static var generator is an active power electronic device. The three-phase four-wire static var generator is used to compensate the reactive power of the distribution network, which can realize real-time fast and stepless compensation compensation. At the same time, it has the advantages of improving power factor and maintaining grid voltage stability. And with the advancement of technology and the reduction of the cost of core components, in my country's three-phase four-wire power supply system, the three-phase four-wire static var generator has a tendency to gradually replace the traditional capacitor compensation device.

[0003] In the civil three-phase four-wire power supply mode, ther...

Claims

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