Energy-storage wind power generation system with squirrel-cage generator

Abstract

The invention discloses an energy-storage wind power generation system with a squirrel-cage generator. The energy-storage wind power generation system comprises a wind turbine, a generator, a stator frequency converter, a grid-connected inverter, a power grid, a transformer and a load, and further comprises an energy storage unit, wherein the energy storage unit comprises an energy storage battery and a charge-discharge circuit connected with the energy storage battery; and the charge-discharge circuit, actually a bi-directional DC converter, is connected in parallel between a DC capacitor and the grid-connected inverter. According to the invention, due to the adoption of the energy storage unit, the problem that the off-grid operation of a current wind power generation system is infeasible is effectively solved, and the low-voltage rid-through problem is also effectively solved. Moreover, compared with the current wind power generation system, as the squirrel-cage generator is adopted, the direct-driven wind power generation system has the advantages of simple structure, small size, light weight, low cost and convenience in maintenance, and improve the security and stability margin of a power grid.

Description

technical field [0001] The invention relates to a squirrel-cage generator direct-drive energy-storage wind power generation system, in particular to a direct-drive squirrel-cage generator direct-drive energy-storage wind power generation system with an energy storage function. Background technique [0002] The wind power generation system always hopes to absorb the most wind energy and convert it into electrical energy, and the utilization rate of wind energy is related to the ratio of wind speed and generator speed, so the rotor speed of the generator rotor in the wind power generation system must be able to change with the wind speed, and the output power of the system The frequency requirement is kept constant in line with the grid frequency. There are two main types of existing variable-speed constant-frequency wind power generation systems: doubly-fed asynchronous generators and direct-drive synchronous generators. The stator of the double-fed generator is directly co...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a squirrel-cage generator direct-drive energy-storage wind power generation system to solve the problem that the existing squirrel-cage generator direct-drive energy-storage wind power generation system cannot The problem of off-grid operation, and effectively solve the problem of low voltage ride through

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