OLTC对静态电压稳定极限影响的研究

摘要

For problems that voltage stability phenomenons caused by OLTC action and load dynamic characteristics are complicated and grasped hardly, the paper analyzed and researched influence of transformation ratio adjustment of OLTC on static voltage stability limit through Pmax-(ψ) and Vcr-(ψ) curves and critical transformation ratio corresponding to OLTC adjustment, so as to get conclusions as following:the Pmax-(ψ) and Vcr-(ψ) curves gradually shift upward with continuous increment of transformation ration of OLTC; the Pmax-(ψ) and Vcr-(ψ) curves gradually shift down with continuous decrease of transformation ration of OLTC; during adjustment of transformation ratio of OLTC, the adjustment range cannot exceed adjustment area determined by critical transformation ratio. The result of an example simulation proved that Pmax-(ψ) and Vcr-(ψ) curves can well describe influence of OLTC adjustment on static voltage stability limit.%针对OLTC动作和负荷动态特性引起的电压稳定现象复杂且不容易把握的问题,利用Pmax 、曲线分析研究了OLTC变比调整对静态电压稳定极限的影响以及OLTC调整时对应的临界变比,即OLTC连续增大变比时,P 曲线将逐渐上移;OLTC连续减小变比时,曲线将逐渐下移;在OLTC变比调整过程中,其调整幅度不能超出临界变比确定的调整区域.算例仿真结果表明,利用曲线能很好地阐述OLTC调整对静态电压稳定极限的影响.