变频感应加热炉电网频率波动下低压智能断路器过流保护控制

Overcurrent Protection Control of Low-voltage Intelligent Circuit Breaker Under Frequency Fluctuations in the Power Grid of Variable Frequency Induction Heating Furnace

电网频率波动会导致电流波形在短时间内发生变化,从而影响过流保护控制的响应速度。为了保障电网频率波动下低压智能断路器过流保护控制的稳定可靠性,提高变频感应加热炉电力系统的保护性能,提出变频感应加热炉电网频率波动下低压智能断路器过流保护控制方法。利用PCL-818L数据采集卡,采集变频感应加热炉供电系统中的电压电流信号;通过强化学习Q-Learning算法,消除信号中的电网频率波动,提高断路器的稳定性;采用引入滑动时间窗口的三段电流保护方法,实现低压智能断路器的过流保护控制。实验结果表明,所提方法能够在有效消除电网频率波动干扰的情况下,提高断路器过流保护控制精度、效率以及稳定性。

Frequency fluctuations in the power grid can cause changes in the current waveform in a short period of time,thereby affecting the response speed of overcurrent protection control.In order to ensure the stability and reliability of low-voltage intelligent circuit breaker overcurrent protection control under frequency fluctuations in the power grid,and improve the protection performance of the variable frequency induction heating furnace power system,a low-voltage intelligent circuit breaker overcurrent protection control method is proposed for variable frequency induction heating furnace power grid frequency fluctuations.PCL-818L data acquisition card is used to collect voltage and current signals in the power supply system of variable frequency induction heating furnace;By using reinforcement learning Q-Learning algorithm,eliminate grid frequency fluctuations in signals and improve the stability of circuit breakers;Adopting a three-stage current protection method that introduces a sliding time window,the overcurrent protection control of low-voltage intelligent circuit breakers is achieved.The experimental results show that the proposed method can improve the accuracy,efficiency,and stability of circuit breaker overcurrent protection control while effectively eliminating the interference of power grid frequency fluctuations.