CAJ | 학술논문

为实现对电压稳定的实时在线监测，亟需研究具有良好精确度、线性度和计算快速性的电压稳定在线评估指标，为此提出一种新的基于支路电压方程可行解域的静态电压稳定Lu指标。该指标可由PMU的局部量测信息快速计算获得。进而，为了消除冗余量测信息对指标精确度的影响，提出了仅利用PMU电压量测信息的Lu改进指标Lu.pro。最后，通过仿真算例验证了Lu及Lu.pro指标具有很好的准确性和线性度，并进一步验证了Lu.pro指标在三相不对称情况下的适用性和有效性。结果表明，Lu指标以及改进的Lu.pro指标能够反映系统中电压稳定的薄弱节点及区域，适用于电压稳定的在线监测与评估。
위실현대전압은정적실시재선감측，극수연구구유량호정학도、선성도화계산쾌속성적전압은정재선평고지표，위차제출일충신적기우지로전압방정가행해역적정태전압은정Lu지표。해지표가유PMU적국부량측신식쾌속계산획득。진이，위료소제용여량측신식대지표정학도적영향，제출료부이용PMU전압량측신식적Lu개진지표Lu.pro。최후，통과방진산례험증료Lu급Lu.pro지표구유흔호적준학성화선성도，병진일보험증료Lu.pro지표재삼상불대칭정황하적괄용성화유효성。결과표명，Lu지표이급개진적Lu.pro지표능구반영계통중전압은정적박약절점급구역，괄용우전압은정적재선감측여평고。
To realize online monitoring of system voltage stability, it is in urgent need of proposing a voltage stability index with ideal accuracy, linearity and computation speed. This paper proposes a new voltage stability index ofLu based on the feasible solution domain of branch voltage equation which can be fast calculated using the local measurement information of PMU. Moreover, in order to eliminate the error produced by redundant measurement information, the improved indexLu.pro is proposed which can be calculated merely with the voltage measurement information of PMU. Simulations are made to prove thatLu andLu.pro are ideal voltage stability indexes with good accuracy and linearity. Furthermore, it is also demonstrated by simulations thatLu.procan be used to evaluate the voltage stability of three-phase unbalanced system. Simulation results show that indexes ofLu andLu.pro can indicate the weak nodes and areas of voltage stability which can be used in online monitoring and evaluation of voltage stability.