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基于相对动能的电力系统暂态稳定实时紧急控制方案

DOI: 10.13334/j.0258-8013.pcsee.2014.07.011, PP. 1095-1102

Keywords: 暂态稳定,广域测量,紧急控制,相对动能,响应控制

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Abstract:

为了实现基于响应的电力系统暂态稳定实时紧急控制,提出了一种基于相对动能概念的紧急控制方案。该方案通过转速差相对功角差变化趋势实时辨识电网暂态稳定性,当判断出系统将会失去功角稳定时,基于两机系统中相对动能的概念计算剩余加速面积,进而同步得到切机措施量。考虑了控制动作延迟时间的影响,使得计算结果更加可靠。该方案脱离了电力系统的元件模型和运行方式的计算,只需利用系统的动态响应曲线,适应任意复杂的运行方式和故障形式。计算仅使用实测的发电机功角和转速量,计算量小,使用方便灵活。通过新英格兰10机39节点算例验证了该方案的有效性。仿真结果表明,该方案可以防止系统进一步恶化甚至造成大停电事故,加强了电网安全稳定防御体系,具有很好的工程实用价值。

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