China Electric Power Research Institute
The centralized control model of the middle-voltage layer and the distributed control model of the low-voltage layer, respectively, are 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 are 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 has gradually failed to meet the load side's demand.The study aims to optimize the control strategy and increase the stability of the distribution network that is 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 is 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.
刘科研,李昭,毛润宇,等. 针对光储并网的中低压配电网分层优化控制策略[J]. 科学技术与工程, , ():复制