不可控整流回路参数优化设计的研究

Parameter Optimun Design of Uncontrolled Rectifying Circuit

三相不可控整流回路的参数设计基本上依赖于经验公式,因此往往造成由滤波电感和储能电容构成的滤波回路参数数值偏大。为解决这一问题,本文从电路的实际工作过程出发,得出了电路在电流连续状况下的工作模态,并在模态分析的基础上得出了电流连续的条件、电流的表达式和网侧功率因数表达式。从本文的推导可知,一旦电路中的电流处于连续状态,网侧的功率因数就会超过0.8,根据这一结论,提出了三相不可控整流回路的优化设计原则。另外,为验证所推导公式的正确性,以网侧功率因数为分析对象,对比了理论计算结果和实验结果。对比结果表明,理论计算结果和实验结果的误差小于2%,因此可以采用所提出的设计公式和设计曲线对三相不可控整流回路进行优化设计。

At present,the parameter design of uncontrolled rectifier circuit depends on experiential equations and their conclusions mostly, which brings on the value of filter composed of energy storing inductor and filter capacitance, bigger than actual needed.In order to solve the problems,the working modes are gotten according to the actual working process of three phase uncontrolled rectifier circuit, which works at continuous state.Based on the modes analysis, the continuous condition of circuit current, the expressions of circuit current and power factor are derived.By the expressions deduced in this paper, it is shown that if three phase uncontrolled rectifier circuit works in continuous state, the power factor of line is more than 0.8.According to the conclusion,the parameters optimun design principle is presented in the paper.In addition,in order to verify the expressions and equations, a comparison between the experimental and calculative results of line power factor are carried out,and indicated that the error is less than 2% .Obviously, the expressions and equations are validated and the parameter optimun design of uncontrolled rectifier circuit will be carried out by the conclusions in the paper.