Wind turbine generator power control method and system based on virtual inertia simulation

Abstract

The present invention relates to a wind turbine generator power control method and system based on virtual inertia simulation. The method comprises: determining an output power of a wind turbine generator according to a real-time frequency of the power grid; and adjusting a real-time output power of the wind turbine generator to be an output power of the wind turbine generator. According to the technical scheme of the present invention, without affecting the wind power generation benefit, by setting the selection function and the parameters thereof, the wind turbine generator only responds tothe dynamic change of the system frequency, and the equivalent moment of inertia provided by the wind turbine generator for the system is increased; under the circumstance of system faults or disturbance, the wind turbine generator can block the excessive change of the frequency, raise the low point of the frequency change, and provide the reaction time for the other unit to perform primary frequency modulation; and at the same time, the problem of the secondary power drop caused by the primary frequency modulation of the wind turbine generator is avoided, and anti-disturbance of the system against the fast change of the power supply and load, and frequency stability of the high proportion wind power system are improved.

Description

technical field [0001] The present invention relates to the field of inertia and frequency regulation of wind power generation participating systems, in particular to a wind turbine power control method and system based on virtual inertia simulation. Background technique [0002] The variable-speed constant-frequency wind turbine realizes the decoupling control between the power generation system and the grid through the grid connection of the fast-controlled power electronic converter device. Compared with the conventional thermal power unit, it has the advantages of flexible control and fast response, but it is not active Responding to system frequency changes, it does not have the ability to actively support inertia and frequency. [0003] With the rapid development of wind power generation, the conventional synchronous generators in the power system have been largely replaced by wind power, the equivalent moment of inertia of the power system has been continuously reduce...

AI Technical Summary

Problems solved by technology

The traditional wind turbine virtual inertia frequency modulation control method based on rotor kinetic energy uses the additional control of the frequency deviation item to perform primary frequency modulation using the wind turbine rotor kinetic energy to support the system frequency. However, participating in the primary frequency modulation of the system requires a stable and lasting energy source. The limited kinetic energy of the rotor is used for frequency regulation. Since the release of rotor kinetic energy will lower the speed of the wind turbine, the end of the first frequency regulation will inevitably lead to a second drop in power, which is not conducive to the frequency stability of the power system.

[0005] At present, there is no reasonable and effective use of rotor kinetic energy, active response to system frequency changes, providing inertia support for the system, and improving the high-ratio wind power system to resist power without affecting the income of wind power generation, leaving no power reserve and external energy storage. Wind Turbine Active Power Control Method with Rapid Load Change Capability and System Stability Performance

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