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Soft start photovoltaic inverter and photovoltaic power generation system

A photovoltaic inverter and soft-start technology, applied in the field of solar energy, can solve problems such as the impact failure rate of electrical equipment and the large starting current of photovoltaic inverters, so as to save space, improve power supply quality and service life of equipment, and reduce startup The effect of current

Active Publication Date: 2018-04-27
CHINA POWER ENG CONSULTING GRP CORP EAST CHINA ELECTRIC POWER DESIGN INST
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a soft-start photovoltaic inverter to solve the problems of large starting current of photovoltaic inverter, obvious impact on electrical equipment and high failure rate

Method used

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  • Soft start photovoltaic inverter and photovoltaic power generation system

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Embodiment Construction

[0024] Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, so as to better understand the purpose, features and advantages of the present invention. It should be understood that the embodiments shown in the drawings are not intended to limit the scope of the present invention, but only to illustrate the essence of the technical solutions of the present invention.

[0025] Glossary

[0026] Circuit breaker: The designed opening and closing device can close, break and carry the current in normal state; and it can also perform closing, breaking and conducting and breaking within a certain period of time under abnormal operating conditions.

[0027] Photovoltaic inverter: Photovoltaic inverter connects resistors and capacitors through power electronic devices (MOSFET, IGBT, etc.), controls the on-off of the device in the form of pulse width modulation, converts the direct current transmitted by the combiner ...

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Abstract

The invention discloses a soft start photovoltaic inverter and a photovoltaic power generation system. The soft start photovoltaic inverter comprises a direct current breaker, a voltage stabilization capacitor, a three-phase inverter bridge, a filter and a thyristor. The direct current breaker, the voltage stabilization capacitor, the three-phase inverter bridge and the filter are electrically connected in sequence. An input end of the thyristor is electrically connected with an output end of the filter. The thyristor is configured in a way that by controlling a conduction angle of the thyristor, output voltage of the soft start photovoltaic inverter is enabled to be gradually increased from zero, and when the thyristor is fully conducted, the output voltage of the soft start photovoltaic inverter reaches the maximum value. The photovoltaic power generation system comprises a photovoltaic assembly, a combiner box, a box type transformer station, a boost station and the soft start photovoltaic inverter. The soft start photovoltaic inverter can reduce start current, reduce impact of starting of the photovoltaic inverter on a power grid, and improve the equipment integration degree.

Description

technical field [0001] The invention relates to the field of solar energy, in particular to a soft-start photovoltaic inverter and a photovoltaic power generation system. Background technique [0002] The photovoltaic power generation system is composed of five parts: photovoltaic array, combiner box, photovoltaic inverter, box-type substation and booster station. The traditional photovoltaic inverter uses an AC circuit breaker to directly connect the filter side of the inverter to the grid of rated voltage (direct start). figure 1 It is a topological structure diagram of an existing photovoltaic inverter. When the AC circuit breaker uses the current passing through the coil, the magnetic flux is generated in the electromagnet, and the iron core realizes the closing and opening of the main circuit due to the action of the electric field force. [0003] The defects of the direct start-up of the photovoltaic inverter are specifically manifested in: due to the large inrush cu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/36H02M7/5387H02J3/38H02S40/36
CPCY02E10/56
Inventor 刘志刚王振中胡益闫飞朝孙东海郭剑洪熊祥方军林涛
Owner CHINA POWER ENG CONSULTING GRP CORP EAST CHINA ELECTRIC POWER DESIGN INST
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