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电网技术  2015 

基于组合方式的多端柔性直流输电系统控制策略

DOI: 10.13335/j.1000-3673.pst.2015.06.019, PP. 1586-1592

Keywords: 多端直流,电压源型换流器,自律分散,电压裕度控制,电压倾斜控制,组合控制

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Abstract:

分析基于电压源型换流器的多端直流输电系统(voltagesourcedconvertermulti-terminalDC,VSC-MTDC)现有控制策略(电压裕度控制与电压倾斜控制)的特点与不足,提出一种新的基于自律分散思想的控制方法。该方法结合了上述二种控制方法的优点,并相互弥补了各自的缺点。正常运行时,主导站定直流电压控制,辅助站定功率控制。一旦主导站因故障丢失,辅助站能够快速并稳定地切换到定电压控制。由于倾斜特性的引入,各换流站的传输功率始终随直流电压的变化而变化,且保持固定的比例关系。因此直流电压不会因电压裕度的选取而产生不同程度的过调量。此后辅助站将作为多端系统的平衡节点,吸收/发出其余端子的功率差额,使系统重新找到新的运行点(预先设定的最优运行点)。在整个暂态过程中,其余端子能够始终不受扰动的影响而保持正常运行,使扰动对直流系统的影响最小化。文中基于PSCAD/EMTDC分别设计这3种控制器,并对其暂稳态特性进行仿真分析与详细比对。仿真结果表明组合控制改善了系统的暂态特性,并能够保证系统在扰动前后都始终运行在最优点。

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