低压智能电容器自适应过零投切技术的研究

Research on Adaptive Zero-Crossing Switching Technology of Low Voltage Intelligent Power Capacitor

提出了一种用于智能电容器的基于电压零点闭环控制的自适应过零同步投切技术。采用模拟电路检测电压零点以及反馈投切时刻,改进磁保持继电器驱动电路,简化采样计算环节,提高了磁保持继电器动作一致性和自适应控制的准确性、稳定性。试验结果表明,该技术具有稳定、可靠的自适应控制效果及对低压电容器投入涌流的限制作用。

An adaptive zero-crossing switching technology for intelligent power capacitor based on closed loop control of zero voltage was presented.Analog circuits were applied for catching zero point of voltage and feeding back switching time.The drive circuits of magnetic latching relay were improved so that its action time has greater consistency.By simplifying the process of sampling and calculating,the stability and accuracy of adaptive control have been improved.The experimental results show that this technology has a stable and reliable effect on adaptive control as well as the result of limiting the inrush current of switching power capacitor.