摘要
一般模型对整流器动态响应分析不够精确,针对这个不足,根据开关函数及状态空间理论建立了三相电压型整流器的数学模型,并利用傅里叶分解将数学模型分解为高频和低频。对高频模型,通过公式推导分析了输入电流谐波与输出电压纹波跟系统参数之间的动态特性关系。对于低频模型,利用坐标旋转将模型变换到两相静止坐标系,简化了模型的分析和控制。为了实现高功率因数整流,控制策略采用双闭环控制。电流内环采用滞环控制,使得电流变化快速跟踪指令值。电压外环采用PI控制,以稳定直流侧电压。在MATLAB/Simulink中进行了仿真,验证了模型的正确性。
Because the general model of the rectifier has the problem of not enough precision on dynamic response, for this deficiency, depend on switching function and state space theory, a mathematical model of three-phase voltage rectifier is built, then use Fourier decomposition to decompose the mathematical model into two model of high frequency and low frequency. For high frequency model, through formula derivation, the dynamic response relationship between input current harmonic and voltage ripple and system parameters is analyzed. For low frequency model, the model is converted to two-phase stationary coordinate system through coordinate rotation so that its’ analysis and control is simplified. In order to achieve high power factor rectifier, a control strategy of double-closed-loop is used. Hysteretic control is used in the inner current loop, made current change tracking command value fast. Voltage loop uses PI control to let DC side voltage stable. Model’s Correctness is verified by simulation through Matlab/Simulink.
出处
《科学技术与工程》
北大核心
2014年第13期90-95,共6页
Science Technology and Engineering
基金
甘肃省自然科学基金(1308RJYA044)资助
关键词
高频模型
低频模型
傅里叶变换
dq变换
双闭环控制
仿真
high frequency model low frequency model fourier decomposition dq transformation double-closed loop control simulation
