Research on Transaction Clearing Method for Power Distribution Network Considering Reactive Power Support Ability of Renewable Energy

In order to solve the transaction clearing problem caused by the insufficient reactive power support ability of renewable energy, the reactive power regulation characteristics of renewable energy are studied and a power distribution network transaction clearing method considering renewable energy reactive power support ability is proposed. Wind power, photovoltaic and other renewable energy sources are generally connected to the power grid through power electronic equipment. Within the capacity control range, there are two adopted control modes including constant voltage and constant reactive power. According to the operation needs of power distribution network, a transaction clearing model aiming at the lowest power energy purchase cost is proposed. A transaction clearing method based on reactive power relaxation is proposed to improve the solving efficiency. Finally, a case study based on the REDS-32 buses system shows that the transaction clearing method can effectively consider the reactive power support ability of renewable energy sources, which could ensure that the transaction clearing results are close to the actual operation requirements and avoid the problem of bus voltage overruns affecting the safe operation of power distribution network.