Large-scale energy storage and permanent magnet wind power generation coordination control system and method thereof

Abstract

The invention provides a large-scale energy storage and permanent magnet wind power generation coordination control system and a method thereof, wherein the system comprises a direct-drive permanent magnet wind power generator, a machine side converter, a machine side converter control system, a machine side torque controller, a network side converter, a network side converter control system, a large-scale energy storage and control system, a battery management system and a double coordination control layer; according to the method, the rotational kinetic energy stored in a turbine blade is released, staged inertia control is provided through a torque limit curve, the problem of frequency instability caused by the fact that a wind power plant is connected to a power grid is solved, and temporary adjustment of system frequency is achieved; wind energy captured by the blades is utilized, and the DC-DC controller realizes bidirectional energy circulation; an energy storage system and a wind power generation system are coordinated and controlled, the problem of secondary frequency reduction is solved, the rotor speed recovery of the wind power generator is accelerated, the temporary frequency modulation capacity and the system inertia response capacity are improved, and the power grid fluctuation caused by wind power generation is stabilized to the maximum extent; and a energy storage unit is kept in a reasonable operation range.

Description

[0001] technical background [0002] The invention belongs to the technical field of wind power generation, and in particular relates to a large-scale energy storage and permanent magnet wind power generation coordinated control system and method for improving system frequency modulation capability. Background technique [0003] Nowadays, due to the decoupling between rotor speed and grid frequency of PMSM through the power converter and the gradual replacement of traditional synchronous generators resulting in inertia reduction, the variable speed wind turbines of large-scale permanent magnet synchronous generators are increasingly Popularity leads to a decline in the system's frequency regulation capability. However, permanent magnet synchronous generators have a large amount of kinetic energy stored in the rotating turbine blades, and this valuable energy can be effectively used to enhance the overall inertia of the power system by controlling the power converter. Large-sc...

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Problems solved by technology

[0003] Nowadays, due to the decoupling between rotor speed and grid frequency of PMSM through the power converter and the gradual replacement of traditional synchronous generators resulting in inertia reduction, the variable speed wind turbines of large-scale permanent magnet synchronous generators are increasingly Popularity leads to a decline in system frequency adjustment capabilities

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