摘要
在综合考虑波形特性、开关损耗、电压利用率及易实现性的基础上,提出一种新的最优移相脉宽调制(PWM)控制策略。从线电压出发,指出电压利用率的提高实质上是一个非线性规划问题,并就此非线性规划问题分8种情况进行讨论,系统地分析了谐波注入正弦脉宽调制(SPWM)电压利用率可以达到的极限值。采用数字仿真得出易于现场可编程门阵列(FPGA)实现的最优移相PWM调制波数据,并对其进行频谱分析。论证了移相法和堆波法在开关损耗上的一致性,以及移相法具有开关动作均匀、易于FPGA实现的特点。最后给出了最优移相PWM策略MATLAB仿真波形以及在SIGA(system in gate array)多电平高压变频器模型机中应用的实验波形。
A novel optimal phase-shifting multilevel PWM algorithm is developed with a balanced consideration of four factors including less harmonic contents, lower switching frequency, fuller DC voltage utilization and easier realization. The algorithm treats the DC voltage utilization as a nonlinear planning problem and the solution is found for 8 cases. Fourier analysis is also made of the optimal modulating waveforms. This paper compares the phase-shifting technique and carrier-based technique to show the advantages of the former. The algorithm is successfully integrated in the FPGA with the prototype machine and output waveform examples also presented.
出处
《电力系统自动化》
EI
CSCD
北大核心
2004年第19期61-64,共4页
Automation of Electric Power Systems
关键词
变频调速
脉宽调制
现场可编程门阵列
多电平
逆变器
frequency speed control
pulse width modulation (PWM)
field programmable gate arrays (FPGA)
multilevel
inverter
