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| Cascade Negative Sequence Compensating Circuit Based on High Frequency Isolation |
| Jia Pengyu, Liu Jianqiang, Huang Yao, Zheng Qionglin |
| Beijing Jiaotong University Beijing 100044 China |
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Abstract A new topology of compensating three-phase negative-sequence current is given which can be cascaded for high voltage level. This contains three windings high frequency transformer which is the core of the system to realize negative sequence energy exchange in three-phase four-wire or three-phase three-wire system. Comparing to conventional APF based on wye-connected cascade multilevel inverter in high power field which consists of cascaded H-bridges, the new circuit conquers the difficulty of compensating negative sequence current and makes the energy exchange between phase and phase. It can also work as APF to compensate the reactive and harmonic currents. The system reduces DC-link voltage pulsation by using three windings high frequency transformer so as to reduce dc-link capacitance. The simulation results about two-level systems are given to verify the topology and at last the experiment results are also presented in a low power platform.
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Received: 26 October 2010
Published: 20 March 2014
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2012, Vol. 27 
