采用广域测量信号的互联电网区间阻尼控制

在大型互联电力系统中，区间模式的低频振荡是限制传输能力的严重瓶颈之一，而经典阻尼控制(如PSS)因限于局部测量不能很好地解决这个问题。迅速发展的广域测量系统能在全网范围内精确测量和高速传递机组相对功角和角频率等量，使得采用广域测量信号构成全局性的区间阻尼控制系统成为可能，进而为提高互联电网的功角稳定性和传输容量提供了契机。文中在一个简单的2区4机电力系统中，研究了采用广域测量信号实现励磁控制器区间阻尼控制环节的设计原理、实现方法和仿真效果，说明了基于广域测量系统的区间阻尼控制能有效抑制区间低频振荡和提高互联系统的传输容量，而且可工程实现。同时就设计适用于复杂电力系统的广域阻尼控制系统提出了一些关键性理论和实际问题，以供进一步深入研究。

INTER-AREA DAMPING CONTROL OF INTERCONNECTED POWER SYSTEMS USING WIDE-AREA MEASUREMENTS

Inter-area low-frequency oscillation often is a serious bottleneck for increasing power transfer across interconnected power system, while existing damping controllers, such as PSS, provide inferior performance in dealing with this problem. The rapid development of wide-area measurement system, or WAMS, paves the way to accurately measure and quickly transfer relative power angles and rotor speeds of generators over the distance of a whole power system, and thus makes it possible to construct global inter-area damping control by using wide-area measurements. This presents a great potential in enhancing power-angle stability and transfer capability. For a simple two-area four-machine power system, this paper studied the designing principle, implementation method and simulation result of an inter-area damping control loop for generators' excitation controllers, thereby demonstrating the effectiveness of WAMS-based inter-area damping control and its possible realization in practical engineering. With regard to developing wide-area damping control for large-scale power systems, some key issues in both theory and practice are put forward for further research.