基于调相法的消弧线圈自动跟踪补偿的测量方法

摘要

A new method is proposed to measure the capacitive and impedance current of resonance grounding power networks based on phase modulation of zero-sequence voltage. For the arc suppression coil and damping resistance in parallel grounded power networks, the grid-to-earth capacitance and resistance can be calculated accurately through switching the parallel damping resistor to increase the damping rate, while adjusting the inductance of arc suppression coil to guarantee phase difference of zero sequence voltage be 90 degrees before and after the adjustment. The simulation model is established and experiments are carried out in MATLAB to verify the correctness of this tuning method. The tuning method is simple, implemented easily, and can be used in not only the follow-resonant arc-suppression but also the pre-resonant one.%提出了一种基于调相法的消弧线圈自动跟踪补偿测量方法。对于消弧线圈并阻尼电阻接地的配电网，通过投切并联在消弧线圈两端的阻尼电阻以增加系统的阻尼率，同时调节消弧线圈的电感量，保证调节前后零序电压的相位互差90°，即可根据已知信息计算出系统的对地电容和对地电导的精确值。通过在Matlab中建立仿真模型并进行仿真实验，验证了所提出的新型调谐方法的正确性。这种调谐新方法操作简单，易于实现，并且在预调式和随调式消弧线圈中均可使用。