变换器无滞后模型及准连续控制电流调节器差分设计方法  

Delayless Model of Converters and Quasi-continuous Current Regulator Design Method Based on Difference-equations

作　　者：马小亮 MA Xiaoliang(Tianjin Research Institute of Electric Science Co.,Ltd.,Tianjin 300180,China)

机构地区：[1]天津电气科学研究院有限公司(原名--天津电气传动设计研究所),天津300180

出　　处：《电气传动》2019年第1期3-11,共9页Electric Drive

摘　　要：电力电子系统动态性能最基础的制约因素是变换器滞后。变换器存在1/2开关周期滞后(工程模型),并据此按工程设计方法计算电流内环调节器参数。变换器的频率特性说明:连续控制的变换器,例如晶闸管整流器(含交-交、LCI等变频器)和自然采样PWM变换器等,是一个无滞后的比例环节(无滞后模型)。变换器无滞后的系统无法按工程设计方法计算电流调节器参数。建议采用调节器差分设计方法,系统2个开关周期到稳态(2拍响应)且超调不大,抗扰动性能好,能消除三相交流电流控制系统的交叉耦合。仿真和变频调速样机的试验结果证实所提模型及设计方法可行。样机中采用FPGA实现电流环及PWM的准连续控制。The most essential restricting factor of power electronic system dynamic performance is the converter delay time.Almost all of documents told that converters are considered as delay or inertia units with half switching period T0/2(engineering model),then regulator parameters of current loops are calculated by using engineering designing method.A different opinion is explained with the aid of frequency characteristics that many continuous controlled converters,for example thyristor rectifiers(including cycloconverters and LCI)and natural sampled PWM converters etc,are proportional units without delay time(delayless models).The regulator parameters of the current loops adopting delayless models can not to be calculated using the engineering method as usual.The regulator design method based on difference-equations was proposed,it made system reach steady state only through 2 switching periods(2 step response)with accepted overshoot,had good anti-disturb ability and eliminate the crossing-coupling of 3-phase AC current control system.The feasibility of the proposed model and design method was verified by simulations and testing results of an inverter-fed motor drive prototype,where its quasi-continuous current control loop and PWM were realized by using FPGA.

关 键 词：无滞后模型 差分设计方法 准连续电流控制 2拍响应 交叉耦合 

分 类 号：TM921[电气工程—电力电子与电力传动]