Control method of virtual synchronous power generation based on independent grid connection of solar and storage

Abstract

The invention discloses a virtual synchronous power generation control method based on independent grid connection of optical storage, including calculating the output active power and reactive power of the parallel port; calculating the output angular frequency of the virtual synchronous generator with the output active power of the parallel port; Calculate the output potential of the virtual synchronous generator from the output reactive power of the parallel port; calculate the voltage synthesis command of the virtual synchronous generator in the three-phase stationary coordinate system and obtain the control quantity of the energy storage inverter; obtain the DC voltage of the photovoltaic inverter The bus voltage command value and calculate the dq axis component command signal of the photovoltaic inverter; calculate the output signal in the three-phase static coordinates and obtain the control amount of the photovoltaic inverter. The method of the invention can make the parallel port simulate the characteristics of a virtual synchronous generator, actively participate in voltage and frequency adjustment; the grid-connected economy of the photovoltaic inverter is not affected, and can also actively participate in the task of reactive power output, reducing the energy storage inverter The burden of reactive power output to achieve reasonable power distribution.

Description

technical field [0001] The invention specifically relates to a virtual synchronous power generation control method based on independent grid connection of optical storage. Background technique [0002] With the development of economy and technology, environmental and energy problems have become increasingly prominent. Photovoltaic power generation is a world-recognized green power generation technology, which can solve environmental problems and energy problems well. Therefore, photovoltaic power generation technology has been greatly developed and researched in recent years. [0003] With the emergence of a large number of distributed photovoltaic power sources in my country's rural areas, the problems have become increasingly prominent: on the one hand, the power grid structure in rural areas is weak, the load density is low, the ability to accept photovoltaics and the ability to resist power fluctuations are weak; After the photovoltaic power supply is connected to the po...

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Problems solved by technology

[0007] A paper titled "A Virtual Synchronous Generator Structure and Its Dynamic Performance Analysis Applied to Photovoltaic Microgrid" (Proceedings of the Chinese Society for Electrical Engineering, 2017(37): p. 444-453) proposed a kind of The application of virtual synchronous generator structure and the corresponding control strategy, but this paper ignores the distribution control of reactive power, resulting in the inability of photovoltaic inverters to participate in reactive power output and voltage adjustment tasks

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