Modified one-cycle-controlled three-phase pulse-width modulation rectifiers under low-output DC voltage conditions
Modified one-cycle-controlled three-phase pulse-width modulation rectifiers under low-output DC voltage conditions
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DOI：
10.1049/iet-pel.2013.0214
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发表时间：
2014-04
影响因子：
2
通讯作者：
Zheng Wei;Jie Chen;Xin Chen;Chunying Gong;Yi Fan
中科院分区：
文献类型：
--
作者：
Zheng Wei;Jie Chen;Xin Chen;Chunying Gong;Yi Fan
本文提出了一种基于单周控制（OCC）的三相PWM整流器的鞍形脉宽调制（PWM）控制策略，该方法通过在三相输入电流采样值中注入三次谐波电流来实现。此外，针对三相维也纳整流器等三电平升压型中点箝位结构整流器，分析了改进OCC策略下中点电位的波动。所提出的控制方案不仅可以提高直流母线电压的利用率和转换器的效率，而不牺牲传统的OCC方案的优点，如没有锁相环和恒定的开关频率，但也是有益的，以抑制直流母线电压的涟漪。此外，在OCC方案中增加了中点电压环，并采用中点电压控制器来控制由于元件参数不均匀而引起的核电厂直流电压不平衡。基于5 kW样机的系统仿真和实验结果验证了理论分析的正确性和改进OCC策略的可行性。
The saddle pulse-width modulation (PWM) that can be obtained by injecting third harmonic current into sampled three-phase input currents is proposed to introduce in the conventional one-cycle control (OCC) strategy-based three-phase PWMrectifier on this study. In addition, for the three-level boost-type neutral-point-clamped structure rectifiers such as three-phase Vienna rectifier, the fluctuation in the neutral-point-potential (NPP) is analysed under modified OCC strategy. The proposed control scheme can not only improve the utilisation of DC bus voltage and the efficiency of converter without sacrificing the advantages of the conventional OCC scheme, such as no phase-locked loop and constant switching frequency, but also is beneficial to suppress the ripple in the DC-link voltage. Moreover, the neutral-point voltage loop is added in the proposed OCC scheme, and the neutral-point voltage controller is employed for controlling the unbalance DC voltage in the NPP which caused by the non-uniformity of parameters of components. The validity of the theoretical analysis and feasibility of the modified OCC strategy are verified by system simulation and experimental results based on a 5-kW prototype.