Coordinated frequency modulation method of wind, diesel and load for high-penetration renewable energy microgrids

Abstract

The invention relates to a wind-driven generator and diesel engine load coordinated frequency modulation method applicable to a high-permeability renewable energy micro power grid. The method includesfollowing steps: 1) establishing a micro power grid model containing a double-feed asynchronous wind driven generator, a diesel engine and a controllable load; 2) obtaining coordinated frequency modulation characteristics of various frequency modulation micro sources containing a high-permeability wind power micro power grid; and 3) obtaining a wind driven generator and diesel engine load coordinated frequency modulation mode applicable to the high-permeability renewable energy micro power grid according to the micro power grid model and the coordinated frequency modulation characteristics, namely, the double-feed asynchronous wind driven generator and the diesel engine preferably participate in frequency modulation, the controllable load participates in frequency modulation only when anabrupt change amount of the load is greater than a standby capacity of the wind driven generator and the diesel engine, and coordinated frequency modulation is realized through coordination of frequency modulation parameters of the wind driven generator, the diesel engine and the controllable load. Compared with the prior art, the method is advantageous in that the frequency modulation capabilities of the wind driven generator and the diesel engine are fully utilized, the frequency modulation pressure of the controllable load is reduced, and the reliability of power supply of a demand side isguaranteed.

Description

technical field [0001] The invention relates to the technical field of power system frequency control, in particular to a method for coordinated frequency regulation of wind, firewood and load suitable for high-permeability renewable energy microgrids. Background technique [0002] With the continuous improvement of the development level of wind power, the penetration rate of renewable energy in the micro-grid is increasing, and the impact on the frequency regulation of the micro-grid is becoming more and more obvious. Doubly-fed induction generator (DFIG) is the mainstream type of wind turbine. Due to its characteristics of decoupling active and reactive power, the system frequency is decoupled from the rotor speed, and the wind turbine cannot respond to system frequency changes. Excessive participation of demand-side controllable loads in frequency regulation will affect the reliability of microgrid power supply. Therefore, there is an urgent need to rationally coordinate...

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Problems solved by technology

[0004] The impact of high-penetration renewable energy on the frequency regulation control of the power system cannot be ignored. After a high proportion of wind power is connected, it will have a greater impact on the inertia of the independent system and primary frequency regulation. There is a high probability that the maximum frequency deviation and static frequency deviation will exceed the safe allowable range.

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