No-load cutting-in modeling and experimental method of double-fed type wind-driven generator

Abstract

The embodiment of the invention provides a no-load cutting-in modeling and experimental method of a double-fed type wind-driven generator. The modeling method comprises the following concrete steps: firstly, establishing a mathematical model for no-load cutting-in control of the double-fed type wind-driven generator; simulating a small-step cutting-in switch element in the double-fed type wind-driven generator by utilizing a valve switch which is controlled by binary control words in a real-time digital simulator (RTDS) of an electric power system; and realizing the simulation control of the double-fed type wind-driven generator from the no-load state to the cutting-in state by controlling the switching-on and the switching-off of the valve switch. The technical scheme of the invention can be implemented to realize the real-time simulation process of the double-fed type wind-driven generator from the no-load state to the cutting-in state, and the simulation model is used for carrying out the no-load cutting-in experiment on a variable-flow controller system of a practical double-fed type wind-driven generator, thereby providing real and accurate simulation environment and improving the verifying accuracy.

Description

technical field [0001] The invention relates to the field of wind power generation systems, in particular to a method for modeling and experimenting with no-load grid-connected doubly-fed wind power generators. Background technique [0002] At present, doubly-fed wind power generators are used in doubly-fed wind power generation systems. Compared with traditional DC excitation synchronous generators and common asynchronous generators, the grid connection process is different. There is a "rigid connection" between the synchronous generator and the power system. The output frequency of the generator depends entirely on the speed of the prime mover and has nothing to do with its excitation; After grid connection, the speed must also be strictly kept constant; the grid connection of the usual asynchronous generator does not require high speed regulation accuracy of the unit, and it will not oscillate and lose synchronization after grid connection, but requires grid connection op...

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Problems solved by technology

[0004] In the existing technology, the research on the principle and process of no-load grid connection has made some progress, but many researches are based on general simulation software, such as MATLAB or PSCAD, but these researches and simulations are only It can perform offline simulation, but it cannot verify the external actual control equipment, nor can it verify the no-load grid connection of the actual doubly-fed wind turbine, lacking the corresponding accuracy

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