| 引用本文: | 周净轩,罗隆福,王海龙.基于双星型多电平潮流控制器与YNvd变压器的同相供电系统[J].电力系统保护与控制,2019,47(8):9-16. |
| ZHOU Jingxuan,LUO Longfu,WANG Hailong.Co-phase power supply system based on double star multilevel power flow controller and YNvd transformer[J].Power System Protection and Control,2019,47(8):9-16 |
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| 摘要: |
| 针对高速电气化铁路领域中存在的负序、谐波与电分相问题，提出了一种基于双星型多电平潮流控制器与YNvd平衡变压器的新型铁路同相供电系统。该双星型多电平潮流控制器为交交变换结构，由四个多电平级联型H桥子模块链节组成，无需直流母线电容。与潮流控制器两端均通过降压隔离变压器连接于变压器二次侧的传统作法不同，该系统将双星型多电平潮流控制器的一侧连接于YNvd平衡变压器二次侧b相分接头，减少了一个降压隔离变压器的成本。分析了该同相供电系统的拓扑结构与工作原理，提出了一种综合控制策略，最后通过仿真验证了所提方案的可行性与有效性。 |
| 关键词: 同相供电系统 潮流控制器 模块化多电平 平衡变压器 负序电流 谐波 |
| DOI：10.7667/PSPC180557 |
| 分类号: |
| 基金项目:国家自然科学基金资助项目(51477046) |
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| Co-phase power supply system based on double star multilevel power flow controller and YNvd transformer |
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ZHOU Jingxuan,LUO Longfu,WANG Hailong
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(College of Electrical and Information Engineering, Hunan University, Changsha 410082, China)
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| Abstract: |
| In order to solve the problem of negative sequence current, harmonic current and electric phase splitting in high-speed railway power supply system, a novel co-phase power supply system based on Double Star Multilevel Power Flow Controller (DS-MPFC) and YNvd balanced transformer is proposed in this paper. This DS-MPFC which consists of four H-Bridge links is AC-AC conversion circuit structure and no direct current bus capacitance is required. Different from the conventional power flow controller based co-phase power supply systems, this system integrates DS-MPFC into the phase-β side flexible taps of YNvd balance transformer instead of into phase-b side via a step-down and isolation transformer, thus the costs are reduced significantly. The topology structure and the working principle are analyzed, furthermore, a synthetical control strategy is proposed. The simulation results show the feasibility and effectiveness of the proposed method. This work is supported by National Natural Science Foundation of China (No. 51477046). |
| Key words: co-phase power supply system power flow controller (PFC) modular multilevel converter (MMC) balanced transformer negative sequence current harmonic |
