Self-adaptive damping control method of virtual synchronous generator

Abstract

The invention relates to a self-adaptive damping control method of a virtual synchronous generator. The self-adaptive damping control method comprises the steps of: acquiring relevant parameters of avirtual synchronous generator system; judging whether low-frequency oscillation occurs in the virtual synchronous generator system according to the relevant parameters, if not, returning to the previous step to acquire data continuously, and if so, adjusting a virtual damping value in the virtual synchronous generator system in a self-adaptive manner according to the acquired relevant parameters;and realizing frequency adjustment of the virtual synchronous generator system according to the virtual damping value. Compared with the prior art, the self-adaptive damping control method has the advantage of being capable of effectively suppressing the low-frequency oscillation of the system.

Description

technical field [0001] The invention relates to the field of inverter control, in particular to an adaptive damping control method for a virtual synchronous generator. Background technique [0002] With the increasing problem of fossil energy, distributed generation (Distributed Generation, DG) with new energy as the main body has begun to attract people's attention. Distributed energy sources dominated by photovoltaics and wind power use power electronic inverters as interfaces when they are connected to the grid. Compared with traditional synchronous generators, they have the characteristics of fast transient response. However, due to the lack of inertia of power electronic devices, and the characteristics of poor overload capacity and small output impedance, the power parameters of the system respond too quickly when disturbances or faults occur, which is not conducive to the stability of the system. Traditional power systems are mostly powered by large synchronous gener...

AI Technical Summary

Problems solved by technology

However, for a single machine infinite system with VSG, when the system parameters are constant, although the VSG introduces the rotor motion equation of the synchronous machine to make it contain a certain amount of inertia and damping, but because the inertia and damping it introduces are relatively large compared to the entire system If it is relatively small, negative damping may occur in other parts of the system to offset the original positive damping in the system, making the total damping of the system small or even negative, resulting in low-frequency oscillations in the system and affecting the stability of the system

Images