Abstract
Due to the instability of photovoltaic power generation, device aging and other factors, the PI parameters of the original PI controller were no longer applicable. So a grid-connected control strategy of photovoltaic energy storage with PI controller parameters optimized by an algorithm was proposed to realize the smooth suppression of photovoltaic power fluctuations. Firstly, the PI controller parameters of the energy storage control part were optimized by using the algorithm, and the optimization process was designed. Then, the second-order low-pass filter was used to distribute the photovoltaic power, and the energy control mode of the energy storage part was designed. Finally, the PI parameter effects of the optimized energy storage control part were displayed by comparing the DC bus voltage in the isolated state, and the power suppression effects under grid-connected condition were displayed by the mixed energy storage power. The rationality of the control mode of the energy storage part was verified by the SOC state diagram of the mixed energy storage. The results showed that the control strategy could effectively suppress pv power fluctuation.
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