基于FPGA技术的三电平自然采样SPWM全数字化理论研究与实现  

Study and Implementation of Natural Sampling SPWM Digital Technologies for Three-level Inverter Based on FPGA Technology

作　　者：刘健[1] 张号[1] 曾华[1] 唐伟[1] 管增伦[2] 

机构地区：[1]武汉工程大学电气信息学院,湖北省武汉市430073 [2]中国中煤能源集团有限公司,北京市朝阳区100120

出　　处：《中国电机工程学报》2017年第5期1498-1506,共9页Proceedings of the CSEE

基　　金：国家科技支撑计划项目(2014BAA04B01);国家自然科学基金项目(51207117);湖北省教育厅科学研究计划(Q20141503)~~

摘　　要：数字化的正弦脉宽调制,能够提高脉宽控制信号输出精度,缩短控制响应时间,增加系统安全稳定性。该文结合高压大功率中性点箝位三电平逆变电路的特点,对其自然采样正弦脉宽调制(sinusoidal pulse width modulation,SPWM)数字化理论进行了研究。论文构建了基于现场可编程门阵列(field programmable gate array,FPGA)的三电平自然采样SPWM全数字化框架,并对三角载波形成、正弦调制波形成、开关状态组合配置,以及死区设置的数字化实现方法进行了研究。提出了一种基于FPGA技术的开关时间的超实时比较计算方法,该方法避免了自然采样SPWM中泰勒级数展开与收敛判断等复杂计算,相比目前数字化常用的规则采样而言,其输出波形谐波含量可以得到进一步降低。论文最后利用超高速集成电路硬件描述语言(very high speed integrated circuit hardware description language,VHDL)与FPGA芯片,对理论研究内容进行了编程实现,软件仿真与试验结果证明了该文数字化理论的正确性与可行性。With the application of digital sinusoidal pulse width modulation （SPWM） control technologies, the precision, responding time, security and stability of the pulse width gating signals can be improved conspicuously. The digital theory of natural sampling SPWM based on filed programmable gate array （FPGA） was studied with the combination of characteristics of high voltage and high power three-level neutral point clamped （NPC） inverter. A framework of full digital natural sampling SPWM was set up. The digital realization method of triangular carrier wave and sinusoidal modulation wave generation, switching states combination and dead time configuration were study in detail. And a FPGA based hyper-real-time duty cycle calculation method was presented, by using this method the Taylor series expansion and convergence judgment could be avoid. The output waveform by natural sampling has less harmonics, compared with that obtained by regular sampling. At last, the theory research has been realized by using very-high-speed integrated circuit hardware description language （VHDL） language and a FPGA chip. The correctness and the feasibility of the digitization theory is proved through both software simulation and experiment results.

关 键 词：三电平逆变器 正弦脉宽调制 自然采样 数字化 

分 类 号：TK228[动力工程及工程热物理—动力机械及工程]