
doi: 10.15589/smi20150208
The analysis of electromagnetic processes in a resonant inverter of the frequency converter with the modulation of the output voltage using high-frequency quasisinusoidal pulses has been conducted. The aim is to study the electrodynamics of the resonant inverter with nonlinear control and to derive the mathematical relationships for determination of the parameters of the storage elements of the converter. Using mathematical modeling and simulation, the processes in the power section of the converter were analyzed. The analytical time characteristics of the currents through the keys and the voltage at the resonant capacitor were received considering the energy losses in the circuit. The THD of the current (2.58%) and voltage (2.78 %) of the resonant elements of the inverter were calculated. A simplified description of the resonant voltage waveform was obtained. The relationship between the load voltage and the pulse frequency of the resonant capacitance voltage and the control characteristic were set. Energy relationships between the load and the storage elements of the resonant converter were obtained. The parameters of the storage elements which ensure the effective operation of the converter were determined. The research results can be applied to the design of the highly efficient secondary power sources with high electromagnetic compatibility. The simulation results confirmed the adequacy of the relationships. The low THD of the key current and resonant voltage allows using this solution for reducing the level of the high-frequency electromagnetic and conductive interference. It allows using the fundamental harmonic method for analysis of the processes in the frequency converters based on resonantinverters.
Выявлены преимущества использования резонансных инверторов с нелинейным регулированием в преобразователях частоты. Проведен анализ электромагнитных процессов в преобразователе при модуляции высокочастотных импульсов квазисинусоидальной формы и получены их регулировочные характеристики. Определены энергетические соотношения между нагрузкой и накопительными элементами преобразователя, необходимые для нахождения их параметров.
З’ясовано переваги використання резонансних інверторів з нелінійним регулюванням у перетворювачах частоти. Проведено аналіз електромагнітних процесів у перетворювачі при модуляції високочастотних імпульсів квазісинусоїдальної форми й отримано їхні регулювальні характеристики. Визначено енергетичні співвідношення між навантаженням і накопичувальними елементами перетворювача, які необхідні для знаходження їхніх параметрів.
преобразователь частоты; резонансный инвертор; регулировочная характеристика; энергетический баланс, перетворювач частоти; резонансний інвертор; регулювальні характеристики; енергетичний баланс, frequency converter; resonant inverter; control characteristics; energy balance
преобразователь частоты; резонансный инвертор; регулировочная характеристика; энергетический баланс, перетворювач частоти; резонансний інвертор; регулювальні характеристики; енергетичний баланс, frequency converter; resonant inverter; control characteristics; energy balance
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