Decoupling control method based on virtual synchronous generator and decoupling control device thereof

Abstract

The invention provides a decoupling control method based on a virtual synchronous generator and a decoupling control device thereof. The decoupling control method based on the virtual synchronous generator comprises the steps that an LC filter equation of the virtual synchronous generator is established; the coordinate system of the LC filter equation is transformed into a dq coordinate system so that the expression of the LC filter equation in the dq coordinate system is obtained; the d-axis component of current, the q-axis component of current, the d-axis component of voltage and the q-axis component of voltage are respectively acquired according to the expression of the filter equation in the dq coordinate system; and auto-disturbance-rejection decoupling control is performed on the d-axis component of current, the q-axis component of current, the d-axis component of voltage and q-axis component of voltage. According to the technical scheme, real voltage and current dq decoupling control can be realized, and robustness and adaptability of a microgrid system are better.

Description

technical field [0001] The invention relates to the field of electrical control, in particular to a decoupling control method and device based on a virtual synchronous generator. Background technique [0002] With the increasing global energy problems and increasing environmental pressure, people's focus has shifted from the field of traditional power generation technology to the field of new energy, distributed power generation technology, micro-grid technology, and the penetration of distributed power in power systems. rate keeps increasing. The output of distributed generation is mostly direct current, which needs to be connected to the distribution network through a grid-connected inverter. Conventional distributed grid-connected power generation control mostly adopts the power electronic grid-connected inverter mode, which has a very fast response speed and negligible moment of inertia, so it cannot participate in grid regulation and cannot guarantee grid stability. ...

AI Technical Summary

Problems solved by technology

The dq decoupling of voltage and current can be achieved by using the traditional PI control algorithm, but in the traditional PI controller, there will be perturbation in the resistance parameters and filter inductance, so there is a difference between the parameters set by the controller, and the feed-forward It is a kind of compensation control that weakens the coupling, and it cannot achieve decoupling in the true sense, and the effect is not ideal

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