Self-adaptive damping control strategy of virtual synchronous generator technology (VSG)-based inversion-type distributed power supply

Abstract

The invention relates to the technical field of control of an inversion-type distributed power supply, in particular to a self-adaptive damping control strategy of a virtual synchronous generator technology (VSG)-based inversion-type distributed power supply. An active power transfer function is built for a control system of the VSG-based inversion-type distributed power supply, the self-adaptivedamping control strategy is made by analyzing influence of a damping coefficient on system output, and the strategy is used for changing the damping coefficient to achieve adjustment n system responserate and reduce fluctuation of the system generated by disturbance according to deviation between an active power output from the inversion-type distributed power supply in real time and a set activepower reference value. By the self-adaptive damping control strategy, control of the grid-connected inversion-type distributed power supply can be achieved, the output characteristic of the inversion-type distributed power supply is more excellent by the control strategy, the interference of the system can be handled very well, stable output is maintained, the control strategy has higher dynamiccharacteristic, and an effective strategy is provided for control of the inversion-type distributed power supply in a power distribution network.

Description

technical field [0001] The invention relates to the technical field of inverter distributed power supply control, in particular to a VSG-based adaptive damping control strategy for inverter distributed power supply. Background technique [0002] Compared with traditional energy sources such as coal and petroleum, distributed generators (DG) have the characteristics of reasonable energy efficiency, low loss, less pollution, flexible operation, and good system economy. It is an important direction for the development of energy technology in the future world. Since the power characteristics of the distributed power supply are different from those of the traditional grid power supply, its output is mostly direct current or non-power frequency alternating current, and a grid-connected inverter must be used to connect to the grid, making inverter interfaced distributed generators (IIDG) a renewable One of the main types of energy. [0003] Different control strategies under diffe...

AI Technical Summary

Problems solved by technology

However, most of the research on VSG is currently limited to the simulation of traditional synchronous generators, while the actual control system has strong flexibility

Compared with the fixed damping coefficient, the damping coefficient adaptively changed according to the operating conditions can make the system obtain better dynamic performance, but there are still few researches on the control method of adaptive damping coefficient

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