An intelligent centralized inverter and transformer photovoltaic power generation grid-connected system

Abstract

The invention relates to an intelligent and concentrated inversion voltage-variable photovoltaic power generation grid-connected system which comprises photovoltaic power generation units, direction-current power distribution cabinets, three grid-connected inverters, a voltage regulating transformer, a filtering device, rectifying devices and a control device, wherein the photovoltaic power generation units are electrically connected with the grid-connected inverters by virtue of the direction-current power distribution cabinets; the grid-connected inverters are electrically connected with the voltage-regulating transformer; the rectifying devices are positioned at the input ends and output ends of the grid-connected inverters; the filtering device is positioned at the output end of the voltage regulating transformer; the three grid-connected inverters are respectively connected by virtue of leads, each lead for connecting every two adjacent grid-connected inverters is provided with at least one control relay, and the control device is electrically connected with the direct-current power distribution cabinets, the grid-connected inverters, the voltage regulating transformer and the control relays. On one hand, the intelligent and concentrated inversion voltage-variable photovoltaic power generation grid-connected system is capable of improving the complexity of a traditional photovoltaic power generation grid-connected operation system, and on the other hand, electric energy provided by a photovoltaic system is integrated and modulated according to use demands.

Description

technical field [0001] The invention relates to a photovoltaic power generation grid-connected operation system, to be precise, an intelligent centralized inverter and transformer photovoltaic power generation grid-connected system. Background technique [0002] At present, photovoltaic power stations have been gradually promoted and applied, but due to the strong dispersion of photovoltaic power generation due to natural environmental factors, and the power generation of a single photovoltaic power generation device is relatively low, and the electric energy obtained by photovoltaic power generation is DC, it cannot Direct grid-connected operation with the power supply grid, therefore, in the actual operation of the current photovoltaic power generation system, it is often necessary to build a large number of inverters and rectifier systems. Rectification and inverter, so that it can effectively meet the needs of the operation of the power grid, but in practice, due to the ...

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Problems solved by technology

[0002] At present, photovoltaic power stations have been gradually promoted and applied, but due to the strong dispersion of photovoltaic power generation due to natural environmental factors, and the power generation of a single photovoltaic power generation device is relatively low, and the electric energy obtained by photovoltaic power generation is DC, it cannot Direct grid-connected operation with the power supply grid, therefore, in the actual operation of the current photovoltaic power generation system, it is often necessary to build a large number of inverters and rectifier systems. Rectification and inverter, so that it can effectively meet the needs of the operation of the power grid, but in practice, due to the low level of integration of the current inverter and rectification system, the structure of the current photovoltaic inverter and rectification system It is complex and needs to be equipped with a large number of inverters, transformers and other equipment, which on the one hand seriously reduces the flexibility and reliability of photovoltaic power generation operation, and on the other hand leads to higher construction and operating costs of photovoltaic power generation systems, which greatly limits The popularization and application of photovoltaic power generation system, so in view of this situation, it is urgent to develop an inventive photovoltaic power generation grid-connected system to meet the needs of actual use

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