CAJ | 학술논문

该文提出了一种基于相量测量单元(phasor measurement unit,PMU)采集动态测量数据在线评估多节点电压稳定性的方法.首先利用灵敏度和灵敏度变化率综合指标确定区域电网内薄弱节点,在薄弱节点上优化配置PMU,通过PMU获取的动态测量数据求解系统潮流方程,根据潮流方程中P-q、Q-q与Q-V的解耦关系,综合雅克比矩阵中JPq 与JQU子阵元素变化偏移量,并在此基础上定义了一种新的电压稳定判定指标.通过对沈阳地区电网电压稳定进行仿真分析,该指标能够反映电压稳定的变化趋势和变化幅度,并且有一个缓慢变化的过程,较灵敏度指标更直观,便于对电压稳定性进行控制.
해문제출료일충기우상량측량단원(phasor measurement unit,PMU)채집동태측량수거재선평고다절점전압은정성적방법.수선이용령민도화령민도변화솔종합지표학정구역전망내박약절점,재박약절점상우화배치PMU,통과PMU획취적동태측량수거구해계통조류방정,근거조류방정중P-q、Q-q여Q-V적해우관계,종합아극비구진중JPq 여JQU자진원소변화편이량,병재차기출상정의료일충신적전압은정판정지표.통과대침양지구전망전압은정진행방진분석,해지표능구반영전압은정적변화추세화변화폭도,병차유일개완만변화적과정,교령민도지표경직관,편우대전압은정성진행공제.
Based on dynamically measured data collected by phasor measurement unit (PMU), an online evaluation method for voltage stability in multi-node system is proposed. Firstly, utilizing aggregative index composed of sensitivity and change rate of sensitivity the weak nodes in regional power network are determined;secondly, optimally configuring PMU to weak nodes, power flow equations of power system are solved by dynamically measured data collected by PMU, and according to decoupling relations of P-θ, Q-θ and Q-V in power flow equations the changing offsets of elements in JPθand JQU sub-matrices of Jacobian matrix are synthesized; on this basis a new kind of voltage stability indices is defined. Results of simulation on voltage stability of Shenyang regional power network show that the proposed indices can reflect variation trend and variation amplitude of voltage stability, besides, the proposed indices change slowly, so they are more intuitional than sensitivity index and using the proposed indices it is more convenient to control voltage stability.