摘要
该文提出了一种基于相量测量单元(phasor measurementunit,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-与Q-V的解耦关系,综合雅克比矩阵中JP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。
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-O, Q-O and Q-V in power flow equations the changing offsets of elements in Jeo and 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.
出处
《电网技术》
EI
CSCD
北大核心
2013年第6期1639-1644,共6页
Power System Technology
基金
辽宁省自然科学基金项目(20110012)
辽宁省博士启动基金资助项目(20111040)~~
关键词
电压稳定
相量测量单元
模拟评估
状态指标
voltage stability
phasor measurement unit
simulated evaluation
state index
