基于全参量灵敏度的电网静态稳定实用判据

针对静态的功角稳定和电压稳定在概念上尚未统一,给稳定分析与控制带来不便的情形。从动力学角度出发,提出电网静态稳定实质是电磁有功功率牵引下的"源–网–荷"功率转化平衡性问题。电压只是这一过程的支撑,性质上属于非线性系统输出变量的有界性问题,而与稳定性没有必然关系。由此,推演最大有功传输及其在R-X坐标上的半圆边界特性。基于全参量灵敏度,给出一种广义的静态稳定实用判据,使静态稳定理论得到扩展。另外,给出电压支撑量化指标,衡量电压支撑水平。理论研究与多场景算例分析表明了新判据的有效性和合理性,在广域测量(wide-area measurement system,WAMS)环境下有望实现在线电网静态稳定监控。

Applied Criterion of Power System Static Stability Based on Comprehensive Parameters Sensitivity Technique

The concepts of static angle stability and voltage stability are inconsistent,which brings inconvenience to stability analysis and control.In the views of dynamics,this paper argues that the essence of the power system static stability is the balance during the source-network-load power transformation process,while voltage is just a physical quantity which supports the conversion process.The value of voltage has not necessary internal relationship with system static stability,and it is just a bounded problem of a non-linear power system output variable.Therefore,this paper deduced the maximum system active power transmission capability,and its semi-circular boundary in R-X coordinate.Based on comprehensive physical parameter sensitivities,an applied criterion of generalized static stability,which expanded the static stability theory,was presented.In addition,the voltage support level index was given to measure system voltage support capability.Theory analysis and various simulation examples show the validity and rationality of the newly developed criterion,and it is expected to realize on-line static stability monitoring in power system based on wide-area measurement system(WAMS).