变速恒频电源闭环控制系统设计

 本文讨论了变速恒频电源闭环控制电路的设计。闭环控制电路的目的除保证变速恒频电源达到所要求的动、静态性能指标外,对其中交交变频器输出中存在的直流、次谐波及其它谐波分量要有强的抑制能力,以减小主电路滤波器的体积重量。为此,文中提出了采用微分反馈并联校正、比例积分串联校正及电压调节的闭环控制系统方案,并进行了一系列实验研究和验证。

THE CLOSED-LOOP CONTROL SYSTEM DESIGN OF VSCF ELECTRICAL POWER

This paper deals in detail with the design of feedback control system for variable speed constant frequency electrical power. The aim of designing a feedback control system is, besides assuring the power system of good dynamic and static characteristics, to suppress strongly the d.c, subharmonic and low harmonic components in the output voltage of cycloconverter, to reduce the weight of outpus filter and increase composed the system effi -ciency. For these purpose the control strategy composed of negative differential feedback parallel compensation, integral propotional series compensation and output voltage regulator is presented based on establishing the power circuit transfer function model. The design principle and methds of control circuit are describled and a series of experimental studies are carried out. The experiment results show that the proposed control strategy has a significant effect on the suppression of harmonics in the output with frequencies lower than 7 times of the fundermental frequency.The control strategy can also be used in d.c-a.c inverter.