A soft-switching single-phase inverter start-up method

A single-phase inverter, soft-switching technology, applied in output power conversion devices, climate sustainability, high-efficiency power electronic conversion, etc. The effect of avoiding excessive voltage stress and improving the operating environment
CN104167913BActive Publication Date: 2016-06-29ZHEJIANG UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
ZHEJIANG UNIV
Publication Date
2016-06-29

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Abstract

The invention discloses a soft switch single-phase inverter starting method. A clamping capacitor of a soft switch inverter is connected in parallel with an auxiliary starting circuit. First-time charging is carried out on the clamping capacitor through the auxiliary starting circuit. After first-time charging, the voltage of the clamping capacitor is smaller than a nominal voltage value. Then, an auxiliary staring impulse sequence for charging the clamping capacitor is applied to the inverter, the inverter is driven, the inverter is subjected to a soft switch process, second-time charging is carried out on the clamping capacitor in the inverter, the clamping capacitor is charged to have a nominal voltage value, and then an inverter control time sequence is converted into soft switch inverter PWM modulation driving signals. According to the method, soft switch operation is achieved at the starting stage of the soft switch single-phase inverter, the voltage stress of an inverter power device during a starting process is greatly lowered, and starting can be carried out safely and reliably under high direct-current bus voltage.
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Description

technical field

[0001] The invention relates to a method for starting an inverter, in particular to a method for starting a soft-switching single-phase inverter. Background technique

[0002] The inverter is a power conversion device widely used in distributed photovoltaic power generation. The compound active clamp technology is applied to the single-phase inverter, which can realize the zero-voltage switching of the device, increase the switching frequency of the inverter, and reduce the Switching loss can effectively improve the power density of the inverter and the efficiency of electric energy conversion. When the soft-switching inverter is started according to the traditional method, because the initial voltage of the clamp capacitor is zero, the soft-switching condition of the inverter cannot be satisfied at the initial stage of the start-up stage, and the inverter still works in the hard-switching state, and the power device has a high voltage during operation. Shut...

Claims

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