基于Delta型级联H桥的APQC-ESS系统分析与控制用于同相铁路供电系统

To address the high energy consumption and power quality (PQ) issues in railway power systems (PS), a delta-connected cascaded H-bridge (CHB) based active power quality conditioner integrating energy storage system (APQC-ESS) for co-phase RPS is proposed. First, the operating principles of APQC-ESS for regenerative braking energy (RBE) utilization, reactive power compensation, and negative sequence current (NSC) suppression are analyzed. Then, a multiobjective decoupled control strategy based on sequence component decomposition is developed to achieve independent control of above multiobjectives. On this basis, a collaborative energy management strategy is investigated to enable real-time multiobjective cooperative control for APQC-ESS under fluctuating traction loads. Specifically, the collaborative energy management categorizes RPS operating conditions into two types based on the NSC severity. Subsequently, a three-stage optimization strategy is employed to allocate APQC-ESS capacity to meet various compensation targets, while comprehensively considering capacity limitations and unbalanced power flow within the CHB branches. Finally, the effectiveness and feasibility of the proposed APQC-ESS and its control strategy is validated through experimental results and a filed data case study. The traction energy consumption reduction rate and RBE utilization rate are 26.6% and 27.6% higher than conventional compensation method.