Virtual synchronous generator control method and device for energy storage converter

Abstract

The invention discloses a virtual synchronous generator control method and device for an energy storage converter, which can achieve a purpose that the damping power only acts in the dynamic process of frequency fluctuation, the damping power after a steady state is constant to be zero, the deviation of the steady-state active power cannot be affected due to change of the damping coefficient, and it is guaranteed that the active power tracks the instruction value according to the set droop proportion while power oscillation is restrained. Besides, while the energy storage converter can provide inertia support and grid-connected and off-grid seamless switching, the device has the capability of quickly controlling a voltage and current loop, quickly controls an output current through the current loop, facilitates reduction of current distortion, and improves the electric energy quality of the energy storage converter during grid-connected and island mode operation.

Description

technical field [0001] The invention relates to the field of power electronics, in particular to a virtual synchronous generator control method and control device for an energy storage converter. Background technique [0002] With the popularization of renewable energy such as photovoltaic power generation and wind power generation, the penetration rate of distributed power sources based on power electronic devices in power systems is gradually increasing. The increase of distributed power generation units with new energy as the main body reduces the inertia of the power system and causes fluctuations in frequency and power. However, the current grid-connected converter is mainly based on the current source mode, which does not have the function of adjusting the frequency and voltage of the power system. Therefore, adding energy storage devices to the microgrid can greatly reduce the grid frequency and voltage fluctuations caused by distributed generation. The most critica...

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Problems solved by technology

[0005] The purpose of the present invention is to address the existing PQ / VF control method of the energy storage converter. There is a problem that mode switching needs to be performed when the grid is connected to the grid. However, the existing virtual synchronous generator control method cannot control the current, and In the current situation of poor power sharing performance in island parallel operation, a virtual synchronous generator control method and control device for energy storage converters are proposed

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