交直流配电网的交换功率灵活性提升方法研究

Method of improving exchange power flexibility between AC/DC distribution network and transmission network

分布式电源(DG)的大规模接入增加了配电网运行的不确定性,主动配电网要求网络具有较强的可观可控性,交直流混合配电网运行方式更加灵活可靠,是未来配电网的发展趋势。文中考虑主动配电网的网络重构、DG无功补偿等措施,建立基于二阶锥规划的交直流配电网与主网交换功率评估模型,求解配电网与主网的交换功率灵活性范围,该范围可为配电网和主网的运行调度提供技术参考。94节点算例验证了模型的有效性,结果表明交直流混合配电网相比传统交流配电网,与主网的交换功率灵活性范围更大,同时电压源换流器容量、DG出力水平等因素与该灵活性范围相关。

With large-scale distributed generation access to distribution network, the uncertainty of network operation increases, active distribution network requires high observability and controllability of the network, AC/DC hybrid distribution network’s operation is more flexible and reliable, it’s the development trend of distribution network in the future. In this paper, network reconfiguration and DG reactive power compensation of active distribution network are considered.The exchange power evaluation model between AC/DC distribution network and transmission network based on second-order cone programming is established. So the exchange power flexibility range between distribution network and transmission network is solved. This range can provide a certain technical reference for the operation and dispatch of the distribution network and transmission network. Solution of 94-node example verifies the validity of the model. The results show that the AC/DC hybrid power distribution network has a larger flexible range than AC distribution network, VSC capacity and DG output level are related to the flexible range.