考虑储能系统调度的交直流混合微电网中互联变流器容量配置

Capacity Configuration of Inter-Linking Converters in AC/DC Hybrid Micro-grid Considering Energy Storage Scheduling

互联变流器是交直流混合微电网中交直流两侧进行功率交换的关键设备,有协调分配交直流两侧功率和提高系统电能质量的作用,在微电网设计阶段,确定互联变流器的配置容量是工程建设的关键环节。文章针对交直流两侧分布式电源、储能系统及负荷在抽样时刻的状态,基于两侧储能系统的灵活调度分析了网间互联变流器的功率流动情况,得到抽样时刻互联变流器的理论传输功率约束。从经济性和电压偏差2个方面建立交直流混合微电网中互联变流器的双目标容量配置模型,采用多目标粒子群算法对其进行求解寻优,得到互联变流器的最佳容量。最后,通过MATLAB编程进行实例验算,验证了所提模型及求解方法的有效性。

Inter-linking converter is the key equipment for power exchange between AC and DC sides in AC/DC hybrid micro-grid.It can coordinate the power distribution between AC and DC sides and improve the power quality of the system.In the design stage of the micro-grid,determining the configuration capacity of inter-linking converter is the key step of engineering construction.Aiming at the state of distributed power generation,energy storage and load on both sides of AC and DC at the sampling time,the power flow of inter-linking converters is analyzed on the basis of flexible scheduling of energy storage on both sides,and the theoretical transmission power constraints of inter-linking converters at sampling time are obtained.The dual-objective capacity allocation model of inter-linking converters in AC/DC hybrid micro-grid is established from two aspects of economy and voltage deviation.The optimal capacity of inter-linking converters is obtained by using multi-objective particle swarm optimization algorithm.Finally,the validity of the proposed model and solution method is verified in a simulation example.