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Soft switch single-phase inverter starting method

A single-phase inverter and soft-switching technology, which is applied in the field of soft-switching single-phase inverter start-up, can solve problems such as soft-switching inverter failures, to ensure safe start-up, improve the operating environment, and avoid excessive voltage stress high effect

Active Publication Date: 2014-11-26
ZHEJIANG UNIV
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Problems solved by technology

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. Shutdown voltage spikes that can cause soft-switching inverters to malfunction during start-up

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  • Soft switch single-phase inverter starting method

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[0051] After the auxiliary starting circuit 1 is connected in parallel with the clamp capacitor Cc of the composite active clamp single-phase inverter, the clamp capacitor C C For the first charge, after the first charge, the clamp capacitor C C The voltage is 15V, which is less than the rated voltage value of 25V.

[0052] Such as Figure 5 As shown, the second charging is carried out through the auxiliary startup pulse sequence, and the clamping capacitor C C The voltage V Cc Reach the rated voltage value of 25V. The inverter bus voltage V dc For 450V conditions, t 4 Before the moment, the maximum actual tube pressure during the working process of the auxiliary start pulse sequence is 468V, while its theoretical minimum value is V dc +V CC0 =465V,t 4 After time, under the action of the PWM modulation driving signal of the soft-switching inverter, the maximum actual tube voltage at the initial stage of the inverter start-up phase is 481V, while the theoretical minimum...

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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.

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...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/36
CPCY02B70/10
Inventor 徐德鸿习江北陈烨楠陈敏谌平平何国锋
Owner ZHEJIANG UNIV
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