基于模糊逻辑的电力系统电压崩溃警报系统

Power System Voltage Collapse Alarm System Using Fuzzy Logic

文中建立了一个既考虑静态传输能力极限又考虑动态负荷特性的电压崩溃警报系统,给出不同级别的警报,指出电压崩溃将有可能发生。警报级别越高,电压崩溃发生的可能性越大。系统故障和负荷缓慢增长都可引发电压崩溃,文中针对后者。该系统通过模糊逻辑实现,擅长处理不确定性和非线性问题。考虑了引起电压崩溃的2个主要因素:传输能力极限和负荷动态特性,前者由线路稳定因子LQP表示,后者由dQ/dt和dP/dt指示。经模糊系统得到动态电压稳定指数(DVSI),并划分成不同的警报级别,即电压稳定水平VSL。其可行性和有效性由IEEE 39节点系统验证,动态负荷为电动机。

Considering both static power transfer limit and dynamic load characteristics a voltage collapse alarm system,which raises different alarm levels of voltage collapse,is proposed to warn that voltage collapse will occur possibly.The higher the alarm level,the more possibly the voltage collapse occurs.Both system fault and slow load growth can lead to voltage collapse,and the proposed alarm system is designed for the latter.The proposed alarm system is implemented by fuzzy logic and it excels at processing problems of uncertain and nonlinear problems.Two main factors leading to voltage collapse,namely the static power transfer limit that is represented by line stability factor（LQP） and the dynamic load characteristics that are reflected by dQ/dt and dP/dt,are considered.By means of fuzzy processing dynamic voltage stability indices are attained and divided into different alarm levels,i.e.,the voltage stability level.The feasibility and effectiveness of the proposed alarm system are verified by IEEE 39-bus system,in which electric motors are taken as dynamic load.