Doubly-fed wind turbine generator participation power grid frequency modulation control system and control method thereof

Abstract

The invention discloses a doubly-fed wind turbine generator participation power grid frequency modulation control system and a control method thereof. The doubly-fed wind turbine generator participation power grid frequency modulation control system comprises a wind turbine generator active control system and an additional frequency modulation module, the additional frequency modulation module comprises a wind turbine generator inertia response module and a primary frequency modulation control module. The frequency control strategy of the wind turbine generator is designed through a method of combining inertia response and primary frequency modulation, and the two kinds of frequency control strategies are mutually coordinated and uniformly matched, so that the doubly-fed wind turbine generator has frequency response characteristics similar to those of a conventional synchronous generator. In a region with high wind power permeability, after the frequency control module is added to the doubly-fed wind turbine generator, the wind turbine generator can carry out inertia support and primary frequency modulation support according to different fluctuation conditions of power grid frequency, the output power of the generator is adjusted in time, that is instantaneous fluctuations of the output power and increases or decreases of the back-up power are responded to the grid frequency, thereby providing an auxiliary support function to the system frequency to enhance the stability of the grid frequency.

Description

technical field [0001] The invention relates to the technical field of new energy wind power generation, in particular to a control system and a control method for a doubly-fed wind generator set participating in power grid frequency modulation. Background technique [0002] With the application of wind power in my country is becoming more and more extensive, wind power continues to enter the power grid, and the scope, degree, and mode of mutual influence between wind power and power grid are deepening, which brings a series of integration problems, such as voltage Severe fluctuations, microcomputer protection malfunctions, frequency oscillations, etc. [0003] At present, the system frequency adjustment problem caused by wind power generation is increasingly concerned by people. Regarding the grid frequency problem caused by wind power, my country's "Technical Regulations for Connecting Wind Farms to the Power Grid" requires that wind farms have the ability to participate in...

AI Technical Summary

Problems solved by technology

[0004] Due to the unique decoupling control method of the doubly-fed wind turbine itself, there is no direct connection between the mechanical kinetic energy of the wind turbine and the grid frequency, and its moment of inertia is not applied to the grid, so the instantaneous fluctuation of the grid frequency increases

In addition, the randomness and volatility of the output power of wind farms make the power system require more reserve power to meet the requirements of one-time regulation of the grid frequency, which increases the operating cost of the system

Images