摘要
对一种应用于380V配电网无功补偿电容器组同步投切装置进行研究。选用磁保持继电器作为同步投切装置执行器件,并采用单片机输入捕捉加AD转化的方式,精确地检测出继电器端电压的过零点。将磁保持继电器的驱动电压从额定的9V提高到24V,保证磁保持继电器动作的一致性。提出了一种利用反馈电流结合PID算法来动态调整磁保持继电器动作时刻的方法,确保磁保持继电器在电压过零时投入,电流过零时切除。该方法自适应能力较强,即使磁保持继电器动作特性发生变化,装置依然能够正常工作。研制的产品样机经过20000次实验,涌流比均在2以下,稳定可靠。
This paper presents a synchronous switching device for reactive power compensation capacitor which is used in 380 V distribution network. Latching relay is used in the synchronous switching device. The terminal voltage crossing point of the relay is accurately detected by using input capture and AD converter technology in the MCU. In order to close and open the relay accurately, we pull the relay driving voltage from 9 V up to 24 V. The paper also proposes a novel way of using the feedback current and combining with the PID algorithm to adjust the relay action time, which makes sure that the relay is closed when the voltage is zero and opened when the current is zero. Even if the characteristic of the relay is changed, the device can close and open normally. The sample product has been tested about 20 000 times. And it is proved that the surge ratio of the relay is below 2 and the system is stable and reliable.
出处
《电力系统保护与控制》
EI
CSCD
北大核心
2012年第6期129-134,146,共7页
Power System Protection and Control
关键词
无功补偿
同步开关
磁保持继电器
电流闭环控制
涌流比
PID
reactive power compensation
synchronous switch
latching relay
closed-loop current control
surge ratio
PID
