LCC谐振式永磁机构储能电容恒流充电控制

Constant Current Charging Control of LCC Resonant Permanent Magnet Mechanism Energy Storage Capacitor

针对真空断路器永磁机构分合闸储能电容恒流充电问题,在分析LCC谐振变换器谐振电流断续模式(DCM)输出特性的基础上,采用模糊恒流控制算法。为解决LCC谐振变换器随着充电电压上升,传统PFM控制难以维持恒流输出从而导致电能传输能力下降问题,采用临界断续频率追踪控制思想,提出一种无需通过精确测量寄生电容参数建立精准数学模型的临界断续频率追踪方法,建立模糊控制器并结合实时临界断续频率实现零电流关断和反向谐振电流同步续流,以提高电能传输效率,实现对永磁机构储能电容的快速恒流充电。实验结果表明,该文提出的模糊恒流控制算法和临界断续频率追踪方法实现了储能电容的恒流充电,并具有工程可行性。

Aiming at the problem of constant current charging of the on-off storage capacitors of the permanent magnet mechanism of the vacuum circuit breaker,based on the analysis of the output characteristics of the resonant current discontinuous mode(DCM)of the LCC resonant converter,a fuzzy constant current control algorithm was used.In order to solve the LCC resonant converter with charging voltage rise,traditional PFM control unable to maintain a constant current output and lead to power transmission loss of the defect,in this paper,by applying the idea of critical intermittent frequency tracking control,eliminating the accurate measurement of the parasitic capacitance parameter,the mathematical model of the critical frequency of intermittent tracking method was presented,and the fuzzy controller was established combining the real-time critical intermittent and reverse the resonant frequency to realize current zero cut-off and synchronous stream,and improve the efficiency of the power transmission,realize the energy storage capacity of permanent magnetic actuator for fast charging with constant current.The experimental results show that the fuzzy constant current control algorithm and the critical interrupted frequency tracking method proposed in this paper realize the constant current charging of the storage capacitor and have engineering feasibility.