Control method of quasi-virtual synchronous machine

Abstract

A control method of a quasi-virtual synchronous machine comprises the steps of connecting a proportional controller in parallel with an inertial link of a virtual synchronous machine to form an activepower loop PI regulator and a reactive power loop PI regulator, converting characteristic of an original integral regulator to characteristic of the PI regulator, generating angle information of thevirtual synchronous machine by an active power controller taking the active power loop PI regulator as a core, generating voltage amplitude information of the virtual synchronous machine by a reactivepower controller taking the reactive power loop PI regulator as a core, and modulating to drive a three-phase bridge-arm insulated gate bipolar transistor (IGBT) to act after Park reverse conversionon the angle information and the amplitude information. Indifference control of an active power and a reactive power can be achieved during grid-connected running and when the voltage amplitude and the frequency of a power grid are normal, inertia and a primary regulation function can be provided when the power grid amplitude and the frequency are abnormal, and power equalization can be easily achieved during off-grid running.

Description

Technical field [0001] The invention relates to a control method of a pseudo-virtual synchronous machine, in particular to a control method of a pseudo-virtual synchronous machine with an active power loop PI regulator and a reactive power loop PI regulator. Background technique [0002] In recent years, with the rapid development of distributed renewable energy and microgrid, the virtual synchronous machine control technology that virtualizes the converter into a synchronous generator can make the converter present a voltage source with inertia and damping characteristics. Widespread concern. However, as a power electronic device, the converter's ability to withstand transient power fluctuations and short-term overload is very limited, which can cause system oscillations, and damage to converter equipment. [0003] The existing virtual synchronous machine controller usually needs to adjust the damping parameter in order to reduce the power oscillation. "CN201610474093-Virtual Sy...

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at the defect that the damping characteristic of the existing virtual synchronous machine becomes invalid when the primary frequency modulation is disabled in grid connection, and proposes a quasi-virtual synchronous machine control method

Solved the problem of power oscillation caused by insufficient damping when the virtual synchronous machine is connected to the grid

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