摘要
与广泛使用的固定开关频率脉宽调制(CSFPWM)策略相比,采用可变开关频率脉宽调制(VSFPWM)可在一定程度上消减电流功率谱密度尖峰,从而降低电机的窄带噪声和系统的传导电磁干扰(EMI)。该文首先基于坐标变换推导出感应电机定子电流纹波峰值的解析表达式,在此基础上提出一种减少开关损耗的VSFPWM策略:在满足最大纹波峰值的约束条件下,根据定子电流纹波与调制比及相位的关系,得到一种可变开关频率的确定方法,通过改变开关频率降低逆变器开关损耗。最后对所提出的调制策略进行理论分析和仿真验证,并搭建了15kW感应电机对拖实验平台,通过分析定子电流及MOSFET的温升情况,验证了可变开关频率脉冲宽度调制(PWM)策略的可行性和有效性。
Compared with the widely used constant switching frequency pulse-width-modulation(CSFPWM)method,variable switching frequency pulse width modulation(VSFPWM)can be used to reduce current power spectral density(PSD)peak values to a certain extent,thereby reducing the narrowband noise of induction motor and suppressing the conducted EMI.In this paper,the analytical expression of stator current ripple peak of induction motor is derived based on coordinate transformation.According to the expression,a VSFPWM strategy for reducing switching loss is proposed,that is,the switching frequency varies within a fundamental cycle to reduce the switching loss of a two-level inverter while maintaining the current ripple peak value within a predefined limit.The theoretical analysis and simulation are carried out,and a 15kW induction motor control platform is built.By analyzing the stator current and the temperature rise of MOSFETs,the feasibility and effectiveness of the variable switching PWM modulation strategy are verified.
作者
黄鹏
刘和平
苗轶如
游逍遥
郭强
Huang Peng;Liu Heping;Miao Yiru;You Xiaoyao;Guo Qiang(State Key Laboratory of Power Transmission Equipment&System Security and New Technology Chongqing University,Chongqing 400044 China;Energy Internet Engineering Research Center of Chongqing Chongqing University of Technology,Chongqing 400054 China)
出处
《电工技术学报》
EI
CSCD
北大核心
2020年第20期4373-4383,共11页
Transactions of China Electrotechnical Society
基金
重庆市教委科学技术研究资助项目(KJ1600944)。
关键词
感应电机
可变开关频率脉宽调制
电流纹波
开关损耗
Induction motor
variable switching frequency pulse width modulation
current ripple
switching losses
