Research on Distributed Photovoltaic Grid-connected Voltage Cooperative Control Strategy Considering Local Load

Xiaotian Xu¹, Xiao Lv¹, Xinyuan Zhang¹ and Xiaotian Xu^1,

¹Nanjing Normal University, Nanjing, Jiangsu, China

Cite this paper:
Xiaotian Xu, Xiao Lv, Xinyuan Zhang and Xiaotian Xu. Research on Distributed Photovoltaic Grid-connected Voltage Cooperative Control Strategy Considering Local Load. American Journal of Electrical and Electronic Engineering. 2020; 8(3):84-90. doi: 10.12691/ajeee-8-3-3

Abstract

The remaining capacity of the photovoltaic inverter has achieved good results in solving the problem of the voltage limit of the grid-connected point of the distributed photovoltaic power generation system. But at present, in order to increase the reactive power capacity of the inverter, related research mainly focuses on limiting the power output of the inverter, without considering the impact on the penetration rate of the distributed photovoltaic power generation system. This paper clarifies the mechanism of the voltage limit of the grid-connected point of the distributed photovoltaic power generation system, and proposes a coordinated control strategy for the voltage of the distributed photovoltaic grid-connected point that takes into account the local load. Use back-to-back converters to control the local load reactive power of photovoltaic power generation, and change the output power of photovoltaic power generation by controlling the working status of the grid-connected inverter. Set up the brake control link. When the limit is exceeded, the local load reactive power control will be given priority to adjust the grid-connected point voltage, thereby avoiding the impact on the photovoltaic power generation capacity of the distribution network. Finally, experiments based on Matlab/Simulink simulation platform verify the feasibility and effectiveness of the proposed control strategy.

Keywords:
PV grid inverter local load voltage limit brake control

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