Modularized photovoltaic grid-connected inverter integrating direct-current power distribution

Abstract

The invention discloses a modularized photovoltaic grid-connected inverter integrating direct-current power distribution, and belongs to the technical field of electric power and electronic device. The modularized photovoltaic grid-connected inverter comprises an alternating-current cabinet and a power cabinet, wherein a power unit is arranged in the power cabinet, and the modularized photovoltaic grid-connected inverter is characterized in that the power unit comprises a power assembly, a direct-current circuit breaker, an alternating-current contactor and an LC filter circuit, which are successively arranged from top to bottom; the alternating-current cabinet comprises a main controller, a first power distribution plate, an alternating-current circuit breaker, a second power distribution plate and an alternating-current filter which are successively arranged from top to bottom; the power cabinet is used for inverting direct-current power generated by a photovoltaic battery to alternating-current power; and the alternating-current cabinet is used for connecting the alternating-current power inverted by the power cabinet to a power grid. The direct-current circuit breaker is integrated into the power unit, and the power unit is designed in a modularization manner, so that the universality and capacity expandability are improved; and the power unit structure is reasonably optimized, so that the power unit of the entire photovoltaic grid-connected inverter has the characteristics of compact structure, high space utilization rate and easiness in maintenance.

Description

technical field [0001] The invention relates to the technical field of power electronic equipment, in particular to a modular photovoltaic grid-connected inverter integrated with DC power distribution. Background technique [0002] With the sharp increase of energy crisis and environmental protection pressure, solar energy has been vigorously developed as a new energy source with the characteristics of wide distribution and no pollution. Photovoltaic inverters, as one of the core components of photovoltaic grid-connected power generation, have maintained rapid growth in both domestic and foreign markets. [0003] The market determines the demand for inverters, and policies guide the development direction of inverters. Although the new installed capacity of domestic photovoltaic grid-connected inverters reached 15GW in 2015, the price continued to decline. This requires PV inverters to be low cost while possessing high standard performance. Due to the relatively harsh envi...

AI Technical Summary

Problems solved by technology

At present, there are many types of photovoltaic grid-connected inverters on the market. The maximum power level ranges from 50kW to 1MW. Technicians, manufacturing and production personnel, and operation and maintenance personnel are all under great pressure

[0004] As the core device of the photovoltaic power generation system, the photovoltaic grid-connected inverter, most of the products on the market have the following defects: 1. The photovoltaic grid-connected inverter is equipped with a separate DC power distribution cabinet, which wastes space and high cost; 2. Inverter The standardization and versatility of the power unit structure of the inverter device is not good, resulting in many types of equipment, which is not conducive to mass production; 3. The scalability of the inverter device is poor; 4. The installation and maintenance of the inverter device are inconvenient

[0008] The photovoltaic grid-connected inverter cabinet with integrated DC power distribution cabinet disclosed in this patent document needs to add a DC input power distribution cabinet separately, resulting in a large waste of space structure and high cost; the power cabinet and the DC input power distribution cabinet are independent of each other. It is not easy to expand the capacity; the structural layout of the power unit is unreasonable, and it is not convenient for the installation and maintenance of vulnerable parts

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