Soft start pre-assembled sub-station room

Abstract

The invention discloses a soft-start pre-assembled substation house, which comprises a photovoltaic inverter, a transformer, an inverter room and a transformer room. The photovoltaic inverter is set in the inverter room, the transformer is set in the transformer room, and the inverter room and the transformer room are connected by copper bars. Among them, the photovoltaic inverter includes a DC circuit breaker, a voltage stabilizing capacitor, a three-phase inverter bridge, a filter and a thyristor. The input end of the thyristor is electrically connected to the output end of the filter, and the thyristor is set to control the conduction angle of the thyristor so that the output voltage of the photovoltaic inverter gradually increases from zero until the thyristor is fully turned on , the output voltage of the photovoltaic inverter reaches the maximum value. The soft-start pre-assembled sub-station house of the present invention can be debugged outside, the safety is guaranteed, and at the same time, excessive surge current can be avoided during the start-up process.

Description

technical field [0001] The invention relates to the field of solar energy, in particular to a soft-start pre-assembled substation building. Background technique [0002] Solar energy has the advantages of safety, cleanliness and resource universality, and can become the main renewable energy to replace fossil energy. Solar photovoltaic power generation has long been the focus of fierce competition among countries around the world in its development research, market development and industrialized manufacturing technology. [0003] 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). 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. [0004] The traditional pre-assembled sub-stat...

AI Technical Summary

Problems solved by technology

[0004] The traditional pre-assembled sub-station requires commissioning personnel to debug the inverter inside the equipment, which threatens the personal safety of personnel. At the same time, the direct start-up of photovoltaic inverters has the following defects:

[0005] ①. Since the photovoltaic inverter will generate a large inrush current when it is started, it will cause a large voltage flicker to the grid-side voltage of the power supply. The service life is shortened, which threatens the personal safety of on-site commissioning personnel;

[0006] ②. Photovoltaic power stations usually require the service life of electrical equipment to reach 25 years, which results in frequent use of circuit breakers, and the circuit breaker has been switched on and off for at least 18,000 times. Mechanical failures such as loose screws and contact wear are prone to occur during use, resulting in photovoltaic inverters. The outage of the inverter will increase the failure rate of the photovoltaic inverter, especially at the end of the equipment life, which will affect the power generation of the photovoltaic power station.

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