基于宽禁带器件的新型配网三相功率调节装置的设计与研究

Study on Design of Wide Band Gap Device-based Three-phase Power Regulation Device for New Distribution Networks

大量分布式新能源接入配电系统后,其出力不确定性使配电网功率分布复杂,三相功率不平衡问题突出。目前国内主流的三相有源不平衡治理装置硬件受系统限制,无法从根本上解决发热和开关频率问题,而新型碳化硅宽禁带开关器具有耐压、低损耗等优势,可以有效应用于配网三相有源不平衡治理。因此,开展新型配网三相功率调节装置研究,首先提出了一种基于四辅助开关的谐振门极驱动电路,并针对桥臂串扰现象提出了一种新型多电平组合驱动电路。其次分析了碳化硅MOSFET开关振荡形成机理并提出了相应抑制方法。最后设计了基于宽禁带器件的新型配网三相功率调节装置,给出了总体方案、硬件电路、软件程序设计方案,并通过基于所提方法研发的功率协调控制器实验样机挂网测试结果,验证了装置的有效性。

Large-scale integration of distributed new energy sources have resulted in complicated power distribution and prominent three-phase power imbalance of power networks owing to output stochasticity of new energy generations.Currently prevailing domestic three-phase active unbalance control devices have hardware limited by the system,and cannot fundamentally solve the problem of heating and switching frequency.The newly developed silicon carbide wide band gap switches,are nevertheless advantegeous with withstand voltage and low loss,and can be effectively applied to the three-phase active unbalance control of distribution networks.Therefore a new three-phase power regulation device for distribution network was studied in this paper.First a resonant gate drive circuit based on four auxiliary switches was proposed,and a new multilevel combined drive circuit was proposed to solve the crosstalk phenomenon of bridge arms.Then the mechanism of switching oscillation of SIC MOSFET was analyzed and the corresponding suppression methods were proposed.Finally a three-phase power regulation device for new distribution networks based on wide band gap devices was designed and the overall scheme,hardware circuit and software program were determine.The effectiveness of the design was verified by the test results of the experimental prototype of the power coordination controller developed based on the method proposed in this paper.