Research on Topology of Modular Multilevel Optical Storage Integrated Grid Connected Inverters
At present,the system structure of large-scale photovoltaic grid connection is relatively single,mostly consisting of low-voltage DC output inverter boost to medium voltage AC collection grid connection.Its structure is complex and there are many conversion links,resulting in complex later operation and maintenance,and relatively high operation and maintenance costs.For large-scale centralized photovoltaic power plants with a capacity of 100 megawatts,both existing AC and DC collection schemes are difficult to achieve active support capabilities of the power grid.This article adopts the modular multilevel(MMC)technology route to construct a new type of integrated high-capacity converter technology for optical storage.The decentralized access scheme is changed to a centralized access method,significantly reducing the number of grid connected inverters and constructing a new generation of grid connected systems that are easy to achieve active support functions for the power grid.Propose a topology structure,photovoltaic array,connection between energy storage devices and integrated photovoltaic energy storage converters for decentralized DC access,and a grid connected main wiring topology to form a converter and system main circuit design scheme suitable for grid connection of 100 MW level photovoltaic power plants.Research was conducted on the key technologies involved,and two MMC topology design methods for energy storage coupling in decentralized measurement and access systems were analyzed,laying the foundation for the design of modular multi-level optical storage integrated inverters.
grid connected inverterintegrated optical storagemodular multilevelDC side coupling
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