一种无锁相环的单相电路谐波和无功电流检测方法

Detection Method without Phase-locked Loop for Single-phase Circuit Harmonic and Reactive Current

在电气化铁路中,电力机车是一个运行的、急剧变化的单相牵引负荷,当由其引起的电网电压波动较严重时,可能导致检测方法中使用的锁相环处于失锁状态而无法进行准确检测。在有功电流分离法的基础上,提出了一种无锁相环的单相电路谐波和无功电流检测方法。理论分析和仿真证明,该方法可以实时检测出单相电路谐波和无功电流,原理简单、易于实现。

In the electrification of the railway, the electric locomotive is a running and sharp change in the single - phase traction load. When the voltage fluctuations caused by it are in a more serious situation, it could lead to the phase -locked loop used in the detection method in a state of losing lock that cannot be accurately detected. Based on the active current separation method, a detection method without phase - locked loop is put forward for single - phase circuit harmonic and reactive current. Theoretical analysis and simulation show that the method can detect real - time single - phase circuit harmonic and reactive current, which is simple in principle and easy to achieve.