Topological structure of medium-voltage direct-hanging photovoltaic power generation system

Abstract

The invention relates to a topological structure of a medium-voltage direct-hanging photovoltaic power generation system, and the structure comprises a plurality of power modules, wherein each power module is internally composed of a photovoltaic module, a high-frequency isolation DC / DC converter module and a DC / AC converter module; the plurality of power modules are connected in parallel to form the overall topological structure through a cascade H-bridge structure, the power modules are independently designed, the input side of each power module is not connected with the common DC bus, and the output side adopts a series structure. The high-frequency isolation DC / DC converter is adopted in the topological structure, so that the size and weight of the whole machine are reduced, and the cost is reduced; the cascade H-bridge topology is adopted, the number of power electronic devices is reduced, redundancy design and seamless switching redundancy modes are conveniently achieved, and the operation safety and stability of the system are improved; the virtual synchronous motor is adopted for control, voltage and frequency support can be provided for a power grid, the inertia and damping of the system are increased, and safe and stable operation of the power grid can be supported more stably.

Description

technical field [0001] The invention relates to topology structure technology, in particular to a topology structure of a medium-voltage direct-mounted photovoltaic power generation system. Background technique [0002] Due to the depletion of energy surplus and serious environmental pollution caused by the massive development of fossil energy, the world is vigorously developing renewable energy power generation technology. As a large energy country, my country's development of renewable energy power generation technology is an important measure to promote energy production and transformation. Among the currently available renewable energy sources, solar energy is recognized as the mainstream direction of renewable energy development in the 21st century due to its large reserves, convenient equipment installation, and flexible scale. [0003] As a new type of photovoltaic power generation system structure, the medium-voltage direct-mounted photovoltaic power generation syst...

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Problems solved by technology

[0006] Therefore, the technical problem to be solved by the present invention is to overcome the problem of insufficient withstand voltage of a single power electronic device in the prior art and the problems of complex MMC structure system, large number of switching devices, and high cost, thereby providing a virtual synchronous motor Controlled medium-voltage direct-mounted photovoltaic power generation system topology

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