基于CPLD的低压系统无功无级柔性补偿器

CPLD-based continuous flexible var compensator for low-voltage system

针对目前低压配电系统中的"过补"、"欠补"和投切振荡等问题介绍了基于CPLD低压系统无功无级柔性补偿器的设计,无功补偿系统中的时间间隔和工作频率的测量及晶闸管的触发脉冲的产生由CPLD完成,提高了系统运行的稳定性、控制的准确性,并节省了硬件资源。给出了时间间隔的测量及脉冲信号产生的仿真波形。系统中有关数据的运算、控制功能及显示电路以单片机为核心来实现。无级补偿模块的触发脉冲既可分相产生,又可三相同时产生,因而系统既可实现三相对称补偿,又可在一定范围内对不对称三相负荷实现柔性平衡补偿。

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.