Research on Voltage Reactive Power Control of Distributed PV Which Access to Distribution Network

Considering that distributed photovoltaic power stations connect to low voltage distribution network in situ. Small capacity of distributed photovoltaic power station access to the power grid can make voltage fluctuate when the photovoltaic array is affected by the illumination. In order to improve the voltage quality of the grid-connected point, from the perspective of hierarchical control, this paper uses SCADA to mark the collected electrical parameters as the pre-correction parameters, and the integrated control strategy is used to adjust the step-up transformer tap and the reactive power compensation device to form the outer control, so as to obtain the post-correction electrical parameters. The post-correction electricity parameter and inverter control constitute the inner control. Through the design of filters, step-up transformer, and parameters such as reactive power compensation device, in the simulation and calculation, the results show that the hierarchical control strategy can implement the automatic control of voltage reactive power regulation, using closed-loop control of inverter for the grid current track of grid voltage, ensure that the system did not produce resonance peak, To reduce the impact of grid voltage to current at the same time make the grid voltage and current with good sine degrees.