Method, device and system for controlling photovoltaic grid connection on basis of virtual synchronous machine
A virtual synchronous machine and control method technology, applied in the field of electrical engineering, can solve the problem that the photovoltaic grid-connected system cannot take into account the voltage control of the photovoltaic array terminal and the realization of the virtual synchronous machine function, etc.
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[0039] A photovoltaic grid-connected system based on a virtual synchronous machine, including a photovoltaic cell panel, a DC / DC converter, and a DC / AC inverter; the photovoltaic cell panel is connected to a DC bus; one end of the DC / DC converter is connected to the DC bus , one end is connected to the energy storage battery, the DC bus is connected to the DC side of the DC / AC inverter, and the AC side of the DC / AC inverter is connected to a transformer. Photovoltaic array power P pv and electromagnetic power P e It is sent to the grid through the inverter, and the inverter simulates the synchronous generator to output reactive power Q to the grid.
[0040] A photovoltaic grid-connected control method based on a virtual synchronous machine of the present invention, the method specifically includes the following steps:
[0041] 1) For DC / DC converter control steps: based on the double closed-loop control mode of power outer loop and current inner loop, establish a synchronous...
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