摘要
基于支路潮流分析,由电压的二次方程有解的条件提出了一种新的电压稳定指标——LSI(Line Stability Index)。该指标可利用支路潮流和支路发送端母线电压相量计算得到,其取值在0到1之间,与1的距离反映了该支路的电压稳定的裕度。将系统中所有支路中最小的一个LSI指标值作为系统的电压稳定指标,该最小指标值对应的支路为系统中的最弱支路,弱支路的受端节点为电压不稳定节点。这样LSI不仅能够确定电压不稳定节点,还能够确定系统的最弱传输路径。IEEE14-Bus系统的仿真计算证明该指标的有效性。
A new voltage stability index LSI was proposed based on branch power flow under the condition of that quadratic equation of voltage has discriminant. The LSI can be gotten by calculating the phasor of branch power flow and branch outlet bus voltage, which is between 0 and 1 and the distance from LSI to 1 is called the margin of the branch voltage stability, and the minimum LSI in all branches of the system is defined as the voltage stability index in the system so that the branch relevant to the minimum LSI is the weakest branch in the system, the inlet nodal point of the weakest branch is the unstable voltage node. Thus, the LSI not only ascertain the unstable voltage node, but also confirm the weakest transmission path in the system. The simulation calculation results with IEEE14 -BUS system showed that the LSI is effective and feasible.
出处
《黑龙江电力》
CAS
2007年第4期252-254,262,共4页
Heilongjiang Electric Power
关键词
电压稳定
支路潮流
LSI
voltage stability
power flow
line stability index （LSI）
