基于失谐量的消弧线圈跟踪调谐方法

New type of automatic tuning arc-suppression coil based on detuning size

为实现消弧线圈的跟踪调谐,提出基于失谐量(ωCΣ-1/(ωL))的消弧线圈跟踪调谐方法。对于消弧线圈并阻尼电阻接地的配电网,改变消弧线圈并联阻尼电阻的大小,测量中性点电压的幅值和相位。通过相位的变化便可判断消弧线圈的补偿状态,根据中性点电压的幅值、阻尼电导和现有的消弧线圈电感值即可计算失谐量,以此失谐量作为反馈量可求出线路对地电容的大小,进而调节消弧线圈可实现电网无功电流的跟踪控制补偿。通过Matlab进行相应的仿真计算,表明变阻尼测量对系统运行影响小,在预调式和随调式消弧线圈中均可使用。

A measurement method named new type automatic tuning arc-suppression coil based on detuning size is proposed to achieve the tracking of the arc-suppression coil tuning. The damping resistor of arc-suppression coil with parallel resistance is changed, and the phase position and amplitude of the neutral voltage are measured. The compensation status of the arc-suppression coil can be identified through the phase change. According to the neutral point voltage amplitude, the damping conductance and existing arc-suppression coil inductance value, the detuning size can be calculated. Taking detuning size as a feedback, the system ground capacitance is calculated, and then by adjusting the arc-suppression coil the tracking compensation for reactive current can be achieved. The corresponding simulation is carried out by using MATLAB. Simulation results show that change damping measurement has little effect on the system and can be used both in the control of a follow-resonant or pre-resonant arc-suppression coil.