Abstract：Independent power supply in dc side is effective to restrain the zero sequence current of hybrid inverter. Taken the ac drive system powered by hybrid inverters as the object, based on the energy exchange relationship between inverters and motor load, this paper has presented a capacity voltage control strategy. In addition, a master-slave vector control system in rotating coordinates has been established in combination with master-slave control structure and asynchronous motor vector control strategy. Simulation and experimental results show that: through increasing the active current reference associated with capacitance voltage fluctuations in the primary inverter current control, capacitor voltage can be effectively stabilized. Meanwhile, on the premise of capacitance voltage stability, the slave inverter can dynamically compensate the primary harmonic current produced by main inverter, making the motor current distortion rate less than 5%.
[1] John G Ciezki, Robert W Ashton. The control of parallel-connected inverters for U.S. navy shipboard applications[D]. California: Naval Postgraduate School, 2001. [2] Kwak S, Toliyat H. A hybrid converter system for high performance large induction motor drives[C]// Applied Power Electronics Conference, Anaheim, 2004: 2349-2354. [3] Attaianese C, Nardi V, Tomasso G. VSI parallel operation for active filtering in high power motor drive[C]//International Electrical Machine and Drives Conference, San Antonio Texas, 2005: 809-814. [4] Trzynadlowski M, Patriciu N, Blaabjerg F, et al. A hybrid, current-source/voltage-source power inverter circuit[J]. IEEE Transaction on Power Electronics, 2001, 16(6): 866-871. [5] Gilead Tadmor. Control of a combined GTO/IGBT drive system for low torque ripple in a large permanent magnet synchronous motor[J]. IEEE Transactions on Control Systems Technology, 2004, 12(1): 21-35 [6] Ye Z, Boroyevich D, Choi J Y, et al. Control of circulating current in two parallel three-phase boost rectifiers[J]. IEEE Transactions on Power Electronics, 2002, 17(5): 609-615. [7] Xing K, Lee F C, Boroyevich D, et al. Interleaved PWM with discontinuous space-vector modulation[J]. IEEE Transactions on Power Electronics, 1999, 14(5): 906-917. [8] Attaianese C, Nardi V, Tomasso G. Active filtering for exploiting of high power synchronous drives[C]// 2006 IEEE International Symposium on Industrial Electronics, Montreal, Que., Canada, 2006: 2349- 2354. [9] 胡维昊, 王跃, 姚为正, 等. 直驱型变速恒频风力发电系统中零序环流的研究[J]. 中国电机工程学报, 2009, 29(27): 99-105. Hu Weihao, Wang Yue, Yao Weizheng, et al. Zero- sequence current in direct drive variable-speed constant-frequency wind energy conversion system[J]. Proceedings of the CSEE, 2009, 29(27): 99-105. [10] 张树全, 戴珂, 谢斌, 等. 并联型有源电力滤波器按容量比例分频段补偿并联控制策略[J]. 电工技术学报, 2010, 25(9): 115-121. Zhang Shuquan, Dai Ke, Xie Bin, et a1. Parallel control of shunt active power filters with capacity proportion frequency allocation compensation[J]. Transactions of China Electrotechnical Society, 20l0, 25(9): 115-121. [11] 曹武, 刘康礼, 赵剑锋. 有源滤波输出限幅的需求分析和实现策略[J]. 电工技术学报, 2015, 30(14): 405-411. Cao Wu, Liu Kangli, Zhao Jianfeng. The analysis of the conditions in which APF need output-limitation and its implementation scheme[J]. Transactions of China Electrotechnical Society, 2015, 30(14): 405-411. [12] 李哲, 吴正国, 夏立, 等. 并联有源滤波器两步预测控制方法研究[J]. 电机与控制学报, 2013, 17(2): 23-27. Li Zhe, Wu Zhengguo, Xia Li, et al. Research on two-sample-period-ahead predictive control for active power filter[J]. Electric Machines and Control, 2013, 17(2): 23-27. [13] 汤赐, 罗安, 赵特, 等. 新型注入式混合有源滤波器的数学模型及电流控制方法[J]. 电工技术学报, 2008, 23(3): 72-79. Tang Ci, Luo An, Zhao Te, et al. Study on mathematic modeling and current control method of new injection type hybrid active power filter[J]. Transactions of China Electrotechnical Society, 2008, 23(3): 72-79. [14] 魏永清, 张晓锋, 乔鸣忠. 用于电机传动系统的多逆变器并联控制技术[J]. 电机与控制学报, 2010, 14(2): 84-88. Wei Yongqing, Zhang Xiaofeng, Qiao Mingzhong. Parallel control technique of multiple inverters based reference voltage regulation[J]. Electric Machines and Control, 2010, 14(2): 84-88. [15] 魏永清, 贺慧英, 向东, 等. 交流传动系统的混合型逆变器控制技术研究[J]. 电工技术学报, 2015, 30(14): 320-324. Wei Yongqing, He Huiying, Xiang Dong, et al. Control technology of hybrid inverters for ac drive system[J]. Transactions of China Electrotechnical Society, 2015, 30(14): 320-324.
2017, Vol. 32 
