混合五电平逆变器的单载波双调制波调制策略
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摘要
以电容箝位型混合五电平逆变器为研究对象,在分析其工作原理及电容电压平衡控制的基础上,提出了一种适用于该混合五电平逆变器的单载波双调制波脉冲宽度调制(PWM)策略。通过控制一个载波周期内电容的充放电量相等来保持其电压平衡,同时只需数字信号处理器(DSP)上的一个ePWM模块即可实现该混合五电平逆变器的控制,降低了控制难度,最大限度地节约了DSP片上资源。实验结果验证了所提调制策略的正确性和可行性。
Based on analyzing the working principle of the capacitor-clamped hybrid five-level inverter and the voltage balance control of capacitor,a single-carrier and dual-modulation waves PWM( Pulse Width Modulation) strategy applied to the capacitor-clamped hybrid five-level inverter is introduced. By controlling the charging capacity equal to the discharging capacity in one carrier period,the voltage balance of capacitor is kept,and the control of the hybrid five-level inverter is achieved with only one ePWM module of DSP( Digital Signal Processor),which reduces the control difficulty and minimizes the DSP consumption. Experimental results verify the correctness and feasibility of the proposed strategy.
Based on analyzing the working principle of the capacitor-clamped hybrid five-level inverter and the voltage balance control of capacitor,a single-carrier and dual-modulation waves PWM( Pulse Width Modulation) strategy applied to the capacitor-clamped hybrid five-level inverter is introduced. By controlling the charging capacity equal to the discharging capacity in one carrier period,the voltage balance of capacitor is kept,and the control of the hybrid five-level inverter is achieved with only one ePWM module of DSP( Digital Signal Processor),which reduces the control difficulty and minimizes the DSP consumption. Experimental results verify the correctness and feasibility of the proposed strategy.
引文
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[15]陈仲,许亚明,刘亚云,等.不对称两单元H桥级联逆变器的混合载波PWM方法[J].中国电机工程学报,2016,36(20):5584-5593.CHEN Zhong,XU Yaming,LIU Yayun,et al. A PWM method based on the hybrid carriers for an asymmetric inverter with two cascaded h-bridge cells[J]. Proceedings of the CSEE,2016,26(20):5584-5593.
[16]XU Shuai,ZHANG Jianzhong,HU Xing,et al. A novel hybrid fivelevel voltage source converter based on T-type topology for high-efficiency applications[C]∥2016 IEEE Energy Conversion Congress and Exposition. Milwaukee,USA:IEEE,2017:1-8.
[17]付家才,郭松林,沈显庆.基于双调制波的单相三电平并网逆变器及电流优化控制[J].电工技术学报,2012,27(3):159-163.FU Jiacai,GUO Songlin,SHEN Xianqing. Dual-modulation waves based single-phase three-level grid-connected inverter and current improvement control[J]. Transactions of China Electrotechnical Society,2012,27(3):159-163.
[2]MALINOWSKI M,GOPAKUMAR K,RODRIGUEZ J,et al. A survey on cascaded multilevel inverters[J]. IEEE Transactions on Industrial Electronics,2010,57(7):2197-2206.
[3]何大清,蔡旭.模块化多电平变流器的限幅控制和混合调制[J].电力自动化设备,2012,32(4):63-66.HE Daqing,CAI Xu. Limitation control and hybrid modulation of modularized multilevel converter[J]. Electric Power Automation Equipment,2012,32(4):63-66.
[4]章勇高,熊健.级联多电平H桥逆变器的同相层叠型SPWM脉冲分配方法[J].电力自动化设备,2017,37(7):148-154.ZHANG Yonggao,XIONG Jian. Pulse distribution strategy for IPDSPWM of cascaded multi-level H-bridge inverter[J]. Electric Power Automation Equipment,2017,37(7):148-154.
[5]BATSCHAUER A L,MUSSA S A,HELDWEIN M L. Three-phase hybrid multilevel inverter based on half-bridge modules[J]. IEEE Transactions on Industrial Electronics,2011,59(2):668-678.
[6]MANJREKAR M D,LIPO T A. A hybrid multilevel inverter topology for drive applications[C]∥Applied Power Electronics Conference and Exposition,1998. Anaheim,USA:IEEE,1998:523-529.
[7]丁凯,邹云屏,蔡政英,等.一种新型单相不对称五电平逆变器[J].中国电机工程学报,2004,24(11):116-120.DING Kai,ZOU Yunping,CAI Zhengying,et al. A novel singlephase asymmetric 5-level inverter[J]. Proceedings of the CSEE,2004,24(11):116-120.
[8]孙醒涛,孙力,吴凤江,等.新型单电源混合不对称多电平变换器拓扑及控制方法[J].中国电机工程学报,2009,29(33):8-14.SUN Xingtao,SUN Li,WU Fengjiang,et al. Topology and control of single power source hybrid asymmetrical multilevel converter[J].Proceedings of the CSEE,2009,29(33):8-14.
[9]RUIZ-CABALLERO D A,RAMOS-ASTUDILLO R M,MUSSA S A,et al. Symmetrical hybrid multilevel DC-AC converters with reduced number of insulated DC supplies[J]. IEEE Transactions on Industrial Electronics,2010,57(7):2307-2314.
[10]SILVA E R C D,MUNIZ J H G,SANTOS E C D,et al. Capacitor balance in a five-level based halfbridge converter by use of a mixed active-cell[C]∥2013 IEEE Energy Conversion Congress and Exposition. Denver,USA:IEEE,2013:414-419.
[11]杨兴武,高淳,姜建国.混合多电平逆变器调制技术研究[J].电力自动化设备,2011,31(10):47-51.YANG Xingwu,GAO Chun,JIANG Jianguo. Modulation technology of hybrid multi-level inverter[J]. Electric Power Automation Equipment,2011,31(10):47-51.
[12]张云,孙力,赵克,等.混合H桥级联型多电平逆变器调制策略优化控制[J].电力自动化设备,2010,30(5):63-66.ZHANG Yun,SUN Li,ZHAO Ke,et al. Optimized control of modulation strategy for hybridH-bridge cascaded multilevel inverter[J].Electric Power Automation Equipment,2010,30(5):63-66.
[13]张云,孙力,吴凤江,等.五开关五电平逆变器的载波交错SPWM控制方法[J].电工技术学报,2010,25(2):101-106.ZHANG Yun,SUN Li,WU Fengjiang,et al. Carriers-staggered SPWM control method based on a five-switch five-level inverter[J].Transactions of China Electrotechnical Society,2010,25(2):101-106.
[14]张云.非对称混合多电平逆变器调制策略及功率均衡控制研究[D].哈尔滨:哈尔滨工业大学,2010.ZHANG Yun. Research on modulation strategies and power balance control of asymmetric hybrid multilevel inverter[D]. Harbin:Harbin Institute of Technology,2010.
[15]陈仲,许亚明,刘亚云,等.不对称两单元H桥级联逆变器的混合载波PWM方法[J].中国电机工程学报,2016,36(20):5584-5593.CHEN Zhong,XU Yaming,LIU Yayun,et al. A PWM method based on the hybrid carriers for an asymmetric inverter with two cascaded h-bridge cells[J]. Proceedings of the CSEE,2016,26(20):5584-5593.
[16]XU Shuai,ZHANG Jianzhong,HU Xing,et al. A novel hybrid fivelevel voltage source converter based on T-type topology for high-efficiency applications[C]∥2016 IEEE Energy Conversion Congress and Exposition. Milwaukee,USA:IEEE,2017:1-8.
[17]付家才,郭松林,沈显庆.基于双调制波的单相三电平并网逆变器及电流优化控制[J].电工技术学报,2012,27(3):159-163.FU Jiacai,GUO Songlin,SHEN Xianqing. Dual-modulation waves based single-phase three-level grid-connected inverter and current improvement control[J]. Transactions of China Electrotechnical Society,2012,27(3):159-163.