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A non -frequency difference control method and device based on virtual synchronous machine

A technology of a virtual synchronous machine and a control method, applied in the direction of reducing/preventing power oscillation, etc., can solve problems such as output frequency offset

Active Publication Date: 2019-01-25
XIANGTAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Wherein, the method can realize frequency-difference-free control, which solves the problem of output frequency offset existing in the existing droop control

Method used

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  • A non -frequency difference control method and device based on virtual synchronous machine
  • A non -frequency difference control method and device based on virtual synchronous machine
  • A non -frequency difference control method and device based on virtual synchronous machine

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Embodiment Construction

[0076] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0077] image 3 It is a flowchart of a control method based on a virtual synchronous machine without frequency difference provided by an embodiment of the present invention. Such as image 3 As shown, the non-frequency difference control method based on the virtual synchronous machine provided by an embodiment of the present invention includes:

[0078] In step S101, the output voltage, inductor current and output current of the virtual synchronous machine a...

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Abstract

The invention discloses a method and device for no-frequency-difference control based on a virtual synchronous machine. Wherein, the method includes: obtaining the output voltage, inductor current and output current of the virtual synchronous machine; calculating the average active power and average reactive power of the virtual synchronous machine according to the output voltage and output current; according to the preset active power reference value , the preset no-load angular frequency reference value and average active power to calculate the phase angle of the virtual synchronous machine; according to the preset no-load output voltage amplitude reference value and average reactive power to calculate the output voltage of the virtual synchronous machine Amplitude; According to the output voltage amplitude, output voltage, inductor current and output current, the voltage and current double closed-loop control is performed to obtain the control signal of the virtual synchronous machine; according to the phase angle and control signal, the frequency-free control based on the virtual synchronous machine is realized. The invention can solve the frequency offset problem existing in the existing droop control.

Description

technical field [0001] The present invention relates to the control field of micro-grid inverters, in particular to a method and device for frequency-difference-free control based on a virtual synchronous machine. Background technique [0002] Microgrid inverters have two working modes: grid-connected and isolated. During grid-connected operation, the microgrid inverter provides power transmission to the main grid; during isolated grid operation, the microgrid inverter is connected in parallel with other distributed micro-sources to provide voltage and frequency support for the microgrid system. Droop control, as a peer-to-peer control, does not require interconnection communication lines, can realize grid-connected and isolated grid operation of micro-grid inverters, and can realize power distribution between inverters, which is a good choice for micro-grid inverters . However, microgrid inverters with droop control do not have the rotational inertia of conventional synch...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/24
CPCH02J3/24
Inventor 刘勇阳建
Owner XIANGTAN UNIV
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