电压型四象限变流器的数值仿真

Numerical Simulation of the Voltage-source 4-quadrant Converter

针对电压型四象限变流器,提出了一种新的控制方法——瞬态电流控制法,建立了变流器系统的数学模型,并在MATLAB环境下进行了计算机仿真。仿真结果表明:在机车运行的两种典型工况即牵引和再生下,该方法不仅能使中间回路的直流电压基本保持恒定,供电接触网或牵引变压器一次侧的功率因数接近于1,而且在电网侧可获得一个近似正弦波的电流,减少对周围环境的电磁干扰,同时,可以在以上两种典型工况间实现平滑的转换。

According to 4-cpiardant converter, proposed a new kind of control strategy-transient current controlling, constitute the mathematic model of the system and carry out computer simulations in MATLAB. The results showed: under the two typical modes of the locomotives that is traction and regenerative modes, this strategy can maintain the voltage of the DC link being constant, the power factor on the line side being nearly unity, the waveform of the current on the line side being nearly sinusoidal, the electromagnetic interference to the ambient being reduced and the changes between the two modes being smoother.