Virtual synchronous control method and rotor-side frequency converter controller

Abstract

The invention relates to a virtual synchronous control method and a rotor-side frequency converter controller. The method comprises the steps of determining a virtual inert mass response state constraint factor of a doubly-fed wind turbine generator according to a system frequency change of the doubly-fed wind turbine generator; correcting a rotation speed of a virtual synchronous machine of the doubly-fed wind turbine generator by use of a correction equation for the rotation speed of the virtual synchronous machine of the doubly-fed wind turbine generator; and performing virtual synchronouscontrol on the doubly-fed wind turbine generator according to the corrected rotation speed of the virtual synchronous machine, wherein the correction equation for the rotation speed of the virtual synchronous machine of the doubly-fed wind turbine generator is determined according to the virtual inert mass response state constraint factor of the doubly-fed wind turbine generator. According to themethod provided by the invention, for the problem of reduction of inertia of a grid-connected system caused by grid connection of the large-scale doubly-fed wind turbine generators, the anti-interference capability and stability of the doubly-fed wind turbine grid-connected system can be improved.

Description

technical field [0001] The invention relates to the technical field of new energy power generation control, in particular to a virtual synchronous control method and a rotor-side inverter controller. Background technique [0002] In response to the energy crisis and environmental pressure, renewable energy sources such as wind energy and solar energy have received extensive attention. Due to the mature development and utilization technology of wind power, it has developed rapidly in recent years. In particular, doubly-fed wind turbines can greatly improve the conversion efficiency of wind energy, reduce the mechanical stress of the unit, realize the decoupling of the mechanical part and the electrical part, and realize active power generation. The decoupling control of power and reactive power improves the adjustment ability and stability of the grid-connected system, and has become one of the main models currently in commercial operation. However, since doubly-fed wind tur...

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Problems solved by technology

[0005] The invention provides a virtual synchronous control method and a rotor-side frequency converter controller, the purpose of which is to solve the problem of inertial decline of the grid-connected system caused by the grid-connection of large-scale doubly-fed wind turbines, and to provide a method that can improve the performance of the doubly-fed wind power grid-connected system. Anti-interference ability and system stability method

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