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Данная работа посвящена оценке энергоэффективности частотно-регулируемого асинхронного электропривода с трехуровневым и двухуровневым преобразователями. Описаны принципы работы автономных инверторов напряжения с широтно-импульсной модуляцией. Дана оценка потерям в силовых ключах инверторов при работе на различные нагрузки (вентиляторная, постоянная мощность) в зависимости от частоты вращения ротора асинхронного двигателя. Дана оценка мощности, потребляемой электроприводом из сети, и зависимости его КПД и КПД преобразователей от частоты вращения.
This work is devoted to the evaluation of energy efficiency of variable frequency asynchronous drive with three-level and two-level converters. The principles of operation of autonomous voltage inverters with pulse-width modulation were described. It was presented the estimation of losses in power switches of the inverters during operating on a variety of load (fan load, constant power) depending on the rotor speed of the asynchronous drive. It was done the estimation of the power, is consumed by drive from power network, and its dependence on its efficiency factor and the efficiency factor of the converters dependence on frequency revolution.
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