CPLD-based continuous flexible var compensator for low-voltage system
Guowen Hu · Dianli zidonghua shebei · 2007
Aiming at the over-and under-compensation and the on-off oscillation,the design of a continuous flexible var compensator based on CPLD is introduced for low-voltage system.The measurement of time interval and power frequency and the generation of trigger pulse are implemented by CPLD,which improves the system stability,simplicity and control veracity.The timing sequences of time interval measurement and pulse generation are provided.The data operations,control functions and display are implemented by singlechip.As the trigger pulse of continuous var compensation module can be generated for 3 phases separately or synchronously,the compensator can realize both 3-phase symmetric compensation and 3-phase balance compensation for dissymmetric loads.