A virtual synchronous generator control method and control device for an energy storage converter

Abstract

The invention discloses a virtual synchronous generator control method and control device for an energy storage converter, which realizes that the damping power only works in the dynamic process of frequency fluctuation, and the damping power must be zero after the steady state, and it will not be affected by damping. The change of the coefficient affects the deviation of the steady-state active power, which ensures that the active power can track the command value according to the set droop ratio while suppressing the power oscillation; in addition, the energy storage converter can provide inertial support and off-grid At the same time of seamless switching, it has the ability of rapid control of the voltage and current loop, and the rapid control of the output current through the current loop is beneficial to reduce the current distortion and improve the power quality of the energy storage converter in 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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