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.
Highlights
As a large number of distributed photovoltaic power generation systems are connected to the grid, the proportion of photovoltaic power generation capacity in the total system capacity is increasing, and the impact on the power system is gradually increasing
Aiming at the deficiencies of the above research, this paper proposes a distributed photovoltaic grid-connected voltage coordinated control strategy that takes into grid-connected point voltage U'point of common coupling (PCC) is: U 'PC=C
When the UPCC deviation value is less than UT1, the grid-connected inverter control is in the braking range, and the local load reactive power control takes priority, and the local load absorbs reactive power to effectively stabilize the UPCC
Summary
As a large number of distributed photovoltaic power generation systems are connected to the grid, the proportion of photovoltaic power generation capacity in the total system capacity is increasing, and the impact on the power system is gradually increasing. It can be seen from formula (4) that the grid connection point voltage is affected by factors such as the impedance parameters of the transmission line, the voltage of the distribution network, the local load power and the output power of photovoltaic power generation. Adopting the coordinated control strategy of adjusting the local load power of the photovoltaic grid-connected and American Journal of Electrical and Electronic Engineering changing the working state of the grid-connected inverter can effectively reduce the occurrence of voltage over-limit phenomenon at the grid-connected point and maximize the consumption of photovoltaic power generation by the distribution network ability
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