摘要
电压稳定已经被称为负荷稳定,为了研究负荷特性对电压稳定问题的影响,对一种负荷模型下的在线电压稳定性问题进行了研究。提出了一种基于时间断面上的局部等效方法,在所要研究的节点处,把电力网络局部等效成两节点系统,利用PMU测得的电压和电流相量,求出局部等效模型的参数。采用静态ZIP模型导出节点电压稳定指标表达式,可以较好评估系统的静态电压稳定性。通过对标准系统的测试,表明此方法得到的指标线性度更好,精度更高。
Voltage stability is called load stability. In order to research the effect of load characteristics on voltage stability, accordingly, online voltage stability of a type of load model is researched. This paper puts forward a local equivalent method which is based on time section. For a researched node, the power grid is equivalent to a two-node system which is composed of a load and a power generation, and the local equivalent model parameters are worked out by using PMU measured voltage and current phasor. Taking static ZIP model as load model, voltage stability index expression is derived, which will be better to evaluate static voltage stability of system. The test about standard system shows that index has better linearitv and higher orecision by this method.
出处
《电力系统保护与控制》
EI
CSCD
北大核心
2012年第6期113-118,共6页
Power System Protection and Control
关键词
电力系统
电压稳定
静态负荷
电压指标
负荷特性
power system： voltage stability
static load
voltage index： load characteristics
