针对光储并网的中低压配电网分层优化控制策略

Hierarchical Optimization Control Strategy of Medium and Low Voltage Distribution Network for Optical Storage Grid Connection

为解决大规模分布式能源并网导致配电网运行产生波动,以及传统配电网中低压层的控制策略相互独立,仅依靠配电网功率信息实现单层控制,其电压控制效果已经逐渐不能满足负荷侧需求的问题,通过分别建立配电网中压层集中式控制模型,低压层分布式控制模型,提出中压层集中式-低压层分布式的分层协调控制的方法,研究如何提升含大比例光伏及储能系统接入的配电网的稳定性,优化控制策略。结果表明:通过二阶锥优化算法与CPLEX求解器运算,得出调控指令并传递至相应节点,通过能量流、信息流、控制流的多流联合作用实现优化控制,实现减少线路损耗,提升配电网稳定性的优化目标。可见中压层集中式-低压层分布式的分层协调控制策略的有效性。

The centralized control model of the middle-voltage layer and the distributed control model of the low-voltage layer,respectively,were established to address the issues that the large-scale distributed energy connected to the grid causes to fluctuate in the distribution network's operation,that the low-voltage layer's control strategies in the traditional distribution network were independent of each other,that single-layer control can only be realized by depending on the distribution network's power information,and that the voltage control effect was gradually failed to meet the load side s demand.To optimize the control strategy and increase the stability of the distribution network that was heavily accessed by photovoltaic and energy storage systems.To achieve this,a hierarchical and coordinated control method of distributed low-voltage layer and centralized middle-voltage layer was proposed.The findings demonstrate that the optimization goal of lowering line losses and enhancing distribution network stability is attained through the utilization of the second-order cone optimization algorithm and CPLEX solver to obtain and transmit control instructions to the appropriate nodes.The optimization control is then accomplished through the multi-flow joint action of energy flow,information flow,and control flow.It is evident that the dispersed low-pressure layer and centralized middle-pressure layer hierarchically coordinated control technique works well.