基于单片机和大容量存储器组合的 特定消谐式电动车用变压变频系统

特定消谐技术应用于以单片机83C552和大容量存储器27PC040为核心的电动车用变压变频调速系统。通过对控制信号的调整，系统可实现变压、变频、稳压、稳频的闭环控制。由特定消谐技术得到的开关角所确定的控制规律可以用较低的开关频率消除较多的低次谐波，使变压变频调速系统输出高质量的正弦波。该系统有效地实现了变压变频调速并且改善了电动车的运行性能。

A Selective Harmonic Elimination VVVF System for Electric Vehicles Based on the Combination of a Microprocessor and a Bulky Memory

Selective harmonic elimination technology was applied to VVVF(Variable Voltage Variable Frequency) timing systems for electric vehicles whose cores were singlechip 83C552 and big capacity memorizer 27PC040. By adjustment to control signal, systems might realize variable voltage, variable frequency, steady voltage, steady frequency closed loop control. Control rule which was decided by switch angles which were gained by the selective harmonic elimination technology might eliminate more low order harmonics by lower switch frequency, which made VVVF timing systems output excellent sine wave. Systems effectively realize VVVF timing and improve the run performance of electric vehicles.