基于功率时空协同的交直流混合配电网调度计划日内修正策略

交直流混合配电网既可通过配置在线路间的电压源换流器(VSC)实现功率在空间维度上的灵活转移,还可通过配置在系统中的储能实现功率在时间维度上的灵活转移.对此,提出一种基于功率时空协同的交直流混合配电网调度计划日内修正策略,通过VSC与储能的协调优化实现资源的时空互补,有效应对负荷与新能源的随机波动.在优化模型中,采用灵敏度方法简化常规潮流约束,并引入支路损耗变化量修正线性灵敏度法的近似误差,保证了功率潮流约束的准确性,显著提高了求解效率.最后,通过仿真算例验证了所提方法的有效性.

Intra-day Correction Strategy of Dispatching Plan for AC/DC Hybrid Distribution Network Based on Spatio-Temporal Power Coordination

AC/DC hybrid distribution network can realize the flexible transfer of power through the voltage source converters (VSCs) in the space dimension. In the meantime, the energy storage configuration in the system can realize the power transfer in the time dimension. An intra-day correction strategy of optimal dispatching plan for AC/DC hybrid distribution network considering the coordination of spatio-temporal power regulation is proposed. In the intra-day correction, the coordinated optimization of VSCs and energy storage is utilized to effectively cope with the random fluctuations of the loads and renewable energy resources. In the optimization model, the sensitivity method is used to simplify the conventional power flow constraints, and the variation of branch loss is introduced to correct the approximate error of the linear sensitivity method, to ensure the accuracy of power flow constraints and significantly improve the solving efficiency. Finally, the effectiveness of the proposed method is verified by simulation cases.