Multi-resource Cooperative Voltage Control Method for AC-DC Distribution Networks Considering Wind and Photovoltaic Output Uncertainties

Under the background of continuously promoting energy transition, AC-DC distribution network makes it more convenient for distributed generation and energy storage to access, which can efficiently consume new energy and is the future development trend. However, the uncertainty brought by massive distributed generation may lead to voltage fluctuation and overrun of AC-DC distribution network. In order to realize voltage stability control, this paper establishes a model of AC-DC distribution network and its controllable resources, then carries out scenario generation and reduction considering the output uncertainty of wind and photovoltaic. Based on the typical scenarios and their probabilities, a voltage control method with joint active-reactive power optimization is proposed, which is solved by an improved particle swarm optimization. Finally, an AC-DC hybrid distribution network simulation model is built based on the IEEE 33-node standard case. The results show that the proposed method can solve the voltage overrun problem and smooth down the voltage fluctuation under low wind and photovoltaic curtailment rate by realizing the cooperation between DC sub-network and multiple controllable resources.