基于分叉理论的动态负荷特性对电压稳定的影响研究

Research into the Effect of Dynamic Load Characteristics on Voltage Stability Based on Bifurcation Theory

电力系统非线性元件的动态特性对电压稳定有着重大的影响。本文以一个考虑详尽模型的三节点系统为例,研究了动态负荷特性对电压稳定的影响。研究结果表明:若系统受扰后仍能保持稳定,则有功、无功功率恢复时间常数越小,系统到达稳定状态速度越快;鞍结分叉和奇异诱导分叉会导致电压单调失稳,时间常数越小,电压崩溃速度越快;霍普夫分叉会导致电压振荡失稳,时间常数越小,振荡幅度越大。负荷暂态电压系数对扰动后系统的第一个运行点位置影响很大,较大参数值下的系统具有较强的维持电压稳定的能力。

The dynamic characteristics of nonlinear components in power systems have a significant impact on voltage stability.Adopt a three node power system with detailed models,research the effect of dynamic characteristics of the load on voltage stability.The results shows: If the system can maintain stability after disturbances,the smaller the active and reactive power recovery time constant,the faster the system reaches the steady state.Both Saddle node bifurcation and singularity induced bifurcation can result in monotonic voltage instability,the smaller the time constant,the faster the voltage collapse.Hopf bifurcation can lead to oscillatory voltage instability,a smaller time constant value causes larger amplitude.Load transient voltage coefficients have great influence on the first operating point after disturbance,the system has a stronger ability to maintain voltage stability when under the condition of larger parameter values.