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通用变频器能量回馈PWM控制系统是一种采用有源逆变方式把电动机减速制动时产生的再生能量回馈电网的装置。它可以克服通用变频器传统制动电阻方式低效、难以满足快速制动和频繁正反转的不足,使通用变频器可在四象限运行。本文首先回顾了变频调速能量回馈控制技术的发展历史及现状,并介绍了常见的两个方案。
Universal inverter energy feedback PWM control system is a kind of use of active inverter mode deceleration of the motor regenerative energy generated when the power back to the power grid. It can overcome the traditional inverter braking resistor inefficient way, it is difficult to meet the rapid braking and frequent reversal of the deficiencies so that the universal inverter can run in four quadrants. This paper first reviews the history and status quo of the development of energy feedback control technology based on frequency control and introduces two common schemes.