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降低直流输电换相失败概率的改进拓扑及其控制策略

DOI: 10.13334/j.0258-8013.pcsee.2015.04.007, PP. 811-820

Keywords: 电网换相高压直流输电,换相失败,新型可控子模块,子模块控制,最优充电初始电压

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Abstract:

为了降低电网换相高压直流输电(line-commutated-converterhighvoltagedirectcurrent,LCC-HVDC)的换相失败概率,提出一种LCC-HVDC改进拓扑。该拓扑从增大换流阀换相电压的角度出发,在原阀臂中串联接入新型可控子模块,以辅助换相。首先介绍该拓扑中子模块的3种工作状态,并分析子模块开关管的电压和电流。然后设计改进拓扑的控制策略,提出“最优充电初始电压”这一概念,并对其进行优化计算。PSCAD/EMTDC仿真结果表明,该拓扑能灵活切换子模块的工作状态,提高了LCC-HVDC防御换相失败的能力;所提出“最优充电初始电压”的优化计算方法效果良好,对该拓扑的换相失败防御能力有进一步的提升作用。

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