Modular photovoltaic grid-connected inverter structure

Abstract

The invention discloses a modular photovoltaic grid-connected inverter structure which comprises more than one unit cabinet, wherein each unit cabinet comprises a modular inversion module, an electrical plate, a filtration system, a cabinet body heat dissipation fan and a cabinet body mechanism; the inversion modules are arranged at the upper parts of the cabinet body mechanisms; the electrical plates are fixed in the cabinet body mechanisms and are vertically arranged at the middle lower parts of the cabinet body mechanisms; the electrical plates are provided with standard configuration electrical regions and optional circuit electrical regions; the standard configuration electrical regions are high-voltage regions and comprise direct current input modules and alternating current output modules; the optional circuit electrical regions can select system control modules and / or alternating current main output modules according to demands; direct current filtration modules in the filtration systems are arranged on the back surface sides of the electrical plates; reactor modules in the filtration systems are arranged in rear spaces of the electrical plates side by side. The modular photovoltaic grid-connected inverter structure has the advantages of easiness in maintenance and repair, small size, modulation, high generality, low large-scale cost and the like.

Description

technical field [0001] The invention mainly relates to the field of photovoltaic inverters, in particular to a modular photovoltaic grid-connected inverter structure. Background technique [0002] With the incentives of renewable energy policies and the large-scale development of the energy market, photovoltaic power generation occupies a larger and larger proportion of the utilization of renewable energy, and has achieved considerable marketization and commercialization, but the cost pressure has always been high The reliability needs to be further improved, and the pursuit of low cost, stable and reliable, and competitive with conventional energy has always been the direction and goal pursued by all walks of life in the industry. [0003] As an important part of the development of renewable energy technology, solar and wind energy grid-connected power generation technology has developed rapidly in recent years and has been widely used. In the solar photovoltaic grid-conne...

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Problems solved by technology

Each of the above two directions has its own advantages, but at the same time there are the following disadvantages: the unit module structure has poor versatility, which is not conducive to the versatility and scale of photovoltaic inverters of various power levels within a wide range of a company; It is necessary to re-optimize the design and manufacture of photovoltaic grid-connected inverters of each power level. The unit structure and versatility of the inverter device are not good, resulting in many types of equipment, which is not conducive to mass production; the inverter device poor scalability

[0006] As the core device of the photovoltaic power generation system, the photovoltaic grid-connected inverter still has many problems such as heat dissipation, maintenance, and low-cost manufacturing: 1), the cooling method of the photovoltaic grid-connected inverter cannot achieve the ideal effect; 2), the inverter The standardization and versatility of the 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 is inconvenient; 5) The control circuit part of the photovoltaic grid-connected inverter is mixed with the heating device, and problems such as electromagnetic interference are difficult to solve

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