State Grid Hubei Electric Power Research Institute

Li Wan

Tao Wang

Guanqun Sun

Liangyi Zhang

Haiguang Liu

Erxi Wang

Zuowei Wang

Wenna Wang

Defu Cai

Kunpeng Zhou

Xiaohui Li

Rusi Chen

Disclosed is an optimal power flow-based hierarchical control method for a distributed energy storage system (ESS), where the method divides control of an energy storage cluster into three layers, performs primary and secondary control to realize intra-cluster control, and performs tertiary control to realize inter-cluster control. In the primary control, droop coefficients are set to realize intra-cluster basic power distribution. In the secondary control, a frequency/voltage shift and uneven power distribution that are caused by a droop are compensated for based on a consistency algorithm. In the tertiary control, a central controller is set, a solution of an optimal power flow is calculated and delivered to each cluster as a control signal, and the control signal is tracked in real time through the secondary control and the primary control. The method adjusts a reference voltage of each energy storage cluster without requiring a common bus.

Optimal power flow-based hierarchical control method for distributed energy storage system (ESS)

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Hubei, China

Li Wan