Voltage source type full-power wind turbine generator set control method based on energy storage coordination control

Abstract

The invention discloses a voltage source type full-power wind turbine generator set control method based on energy storage coordination control, which simulates inertia and frequency modulation and voltage regulation characteristics of a synchronous generator, so that a full-power wind turbine generator set has the capability of supporting weak power grid voltage and frequency. According to the method, the spontaneous angle of the grid-side converter is obtained by dynamically adjusting the voltage of the direct-current bus, so that the grid-side converter is synchronized with the power grid,and the stability problem caused by the fact that a phase-locked loop achieves power grid synchronization under the condition of a weak power grid in traditional grid-connected control is avoided. Meanwhile, the direct-current side external energy storage device provides energy for the wind turbine generator set for standby application. The problem that due to limited kinetic energy of a wind turbine rotor, wind turbine generator rotation reserve is insufficient is solved. Coordinated operation of grid-side converter direct-current bus voltage dynamic virtual synchronous control and an energystorage device is expected to be achieved, so that the stability of a wind turbine generator under a weak power grid is improved, and the primary frequency modulation and voltage regulation capacity is improved.

Description

technical field [0001] The invention relates to the field of wind power generation, and specifically proposes a voltage source type full-power wind turbine control method based on energy storage coordinated control. Background technique [0002] With the global energy crisis and environmental problems becoming more and more prominent, wind power technology, as a clean energy source, has been widely concerned and developed. With the increasing demand for wind power generation, large-capacity and high-proportion wind power systems are continuously integrated into the grid, the proportion of traditional synchronous generators is gradually reduced, and the rotating reserve capacity and moment of inertia of the power system are relatively reduced. The wind turbines exhibit the characteristics of current sources to the outside. Under weak grid conditions, large-scale wind turbines are likely to cause problems such as voltage instability and lack of inertia when they are connected ...

AI Technical Summary

Problems solved by technology

[0006] 1. In the traditional grid-connected control, the dynamic performance of the phase-locked loop deteriorates under weak grid conditions, which brings stability problems to the system;

[0007] 2. In the traditional grid-connected control, the wind turbines exhibit the characteristics of current sources to the outside, and cannot provide inertia and damping for the system. The wind turbines do not have the ability to adjust frequency and voltage;

[0008] 3. Most of the existing voltage source control schemes use the kinetic energy of the fan rotor as energy backup. The kinetic energy of the rotor is limited, and the wind turbine does not have the ability to participate in a frequency modulation

Images