基于零矢量嵌入的双向隔离型AC-DC矩阵变换器分段同步控制策略  

Piecewise Synchronous Control Strategy of Bidirectional Isolated Matrix AC-DC Converter Based on Zero Vector Embedded

作　　者：梅杨[1] 许策 鲁乔初 Mei Yang;Xu Ce;Lu Qiaochu(Inverter Technology Engineering Research Center of Beijing,North China University of Technology,Beijing,100144,China)

机构地区：[1]北方工业大学北京市变频技术工程技术研究中心,北京100144

出　　处：《电工技术学报》2021年第22期4784-4794,共11页Transactions of China Electrotechnical Society

基　　金：北京市自然科学基金(3192012);国家自然科学基金(51477003)资助项目。

摘　　要：针对双向隔离型AC-DC矩阵变换器,提出一种基于零矢量嵌入的分段同步控制策略。其中,前级3-1矩阵式变换电路采用对称双线电压调制法,以提高电压传输比;后级全桥电路采用互补控制,简单易实现;前后级电路之间分段同步,并通过在前级电路中嵌入零矢量以实现能量的双向传输。仿真和实验结果表明,网侧电流三相平衡正弦,功率因数接近于1,输出电压和电流平稳,纹波小,且电感电流峰峰值随直流侧电压增加呈先减小后增大的趋势,当nUo=√3U_(i)时,电感电流峰峰值最小,即电流应力最小。由此可见,采用该文提出的控制策略可实现双向隔离型AC-DC变换器能量的双向流动,保证了良好的输入输出性能。通过与传统控制策略的仿真与实验对比,采用所提出控制策略的双向隔离型AC-DC矩阵变换器在较低输出电压范围内具有更小的电感电流应力,有助于降低器件损耗,提高变换器效率,并提升系统可靠性。In this paper,a piecewise synchronous control strategy of the bidirectional isolated AC-DC matrix converter based on zero vector embedded is proposed.In this control strategy,a symmetrical double-line-voltage modulation is adopted for the front-stage three-phase to single-phase matrix converter(3-1MC),which improves the voltage transfer ratio;a complementary control is employed for the back-stage circuit full-bridge(FB)converter,which is simple and easy to implement.By embedding the zero vector into 3-1MC modulation,the 3-1MC and FB are piecewise synchronous,which enables the bidirectional power transfer.Simulation and experimental results verify that the isolated bidirectional AC-DC matrix converter features balanced sinusoidal currents at grid side,nearly unity input power factor,and stable DC output voltage/current with low ripples.The peak value of inductance current(current stress)decreases first and then increases with the increase of DC output voltage,which is at the minimum value while nUo=√3U_(i).Hence,the bidirectional power flow and good input/output performances of the bidirectional isolated AC-DC converter can be ensured under the proposed control strategy.Compared with the traditional control strategy,the bidirectional isolated AC-DC matrix converter with the proposed control strategy has smaller inductance current stress in the lower DC voltage range,which helps to reduce device losses,enhance efficiency and improve system reliability.

关 键 词：AC-DC变换器 矩阵变换器 分段控制 电流应力 

分 类 号：TM464[电气工程—电器]