1 Research and development overview
Figure 1 Circuit structure of hybrid compensation device
In the parallel hybrid compensation device, the main circuit of the active filter adopts a voltage source pulse width modulation (PWM) inverter with high efficiency and low loss. The function of the active filter is mainly to generate the current IC to compensate for the harmonic current, and the passive filter is mainly used to compensate for the reactive power and compensate for the harmonics of a specified order. The advantage of this arrangement is that the capacity of the parallel active filter can be greatly reduced, which is convenient for the application of the parallel active filter. In the series complex (hybrid) compensation device, the function of the active filter is to generate the voltage UC to compensate for the harmonic voltage, so that the power supply side and the nonlinear load can achieve harmonic isolation. Its advantage is that the capacity of the series active filter can be greatly reduced, and the passive filter can compensate for both reactive power and harmonics. Its disadvantage is that the safe isolation and protection of the series active filter applied to high voltage levels still has some technical difficulties, so it can only be applied to some low voltage and small capacity occasions [1]. Therefore, this project selected the development of a parallel hybrid active filter device suitable for high voltage and large capacity occasions.
Figure 2 Main circuit diagram of high and low voltage transformation structure
Figure 3 Spectrum analysis of the 10kV line current before and after the compensation device is put into operation
Figure 4 Changes in the total harmonic distortion rate of the 10kV bus voltage before and after the compensation device is put into operation
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