Self-starting control method of doubly-fed asynchronous wind turbine based on energy storage system

Abstract

The invention discloses an energy-storage system-based self-starting control method for a double-fed induction generator. The control method particularly comprises the steps as follows: (1) when a power network is in a low-voltage fault, a self-starting controller of the double-fed induction generator cuts off a network side load; an energy-storage system is merged into two ends of a direct-current capacitor; the energy-storage system charges the direct-current capacitor; and the control system adopts a PV voltage control strategy; (2) after network side voltage reaches the control range of rated voltage, a system load is connected; meanwhile, a frequency controller is started; the self-starting frequency of the generator is further controlled to ensure that the frequency of the system is stabilized within the rated frequency; and (3) after the controller detects stable frequency and voltage of the system, the system stably runs, cuts off the energy storage system, and is converted into a PQ power control mode to stably run; and the self-starting process of the generator is ended. Under the direct-current voltage support of the energy storage system, self-starting and running with the load of the generator are achieved; and stable voltage and frequency are ensured.

Description

technical field [0001] The invention relates to the operation control technology of a wind turbine, in particular to a self-starting control method for a doubly-fed asynchronous wind turbine based on an energy storage system. Background technique [0002] With the continuous improvement of the interconnection degree of the power grid, the structure of the power grid is becoming more and more complex, coupled with the use of long-distance power transmission, the impact load increases, and the security and stability of the power system are greatly challenged. Although the economy and reliability of power system operation have been greatly improved in recent years, it is still difficult to avoid large-scale power outages that may occur when severe faults occur. Therefore, after a major blackout occurs, backup energy needs to participate in the black start process of the system. [0003] Because the double-fed generator set (Double-Fed Induction Generator, referred to as DFIG) ...

AI Technical Summary

Problems solved by technology

This patent proposes a doubly-fed asynchronous wind turbine self-starting control technology based on an energy storage system, so that the doubly-fed asynchronous wind turbine can be self-started under the condition of grid-side voltage loss, so that it is possible to participate in the black start after a blackout process

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