Simulation modeling method for equivalent simulation of doubly-fed wind-power generator set

Abstract

The invention provides a simulation modeling method for equivalent simulation of a doubly-fed wind-power generator set. A frequency converter of the doubly-fed wind-power generator set is simulated by controlled source. The simulation modeling method includes the following steps of (1), building a model of a circuit of the doubly-fed wind-power generator set; (2) building an equivalent model of the doubly-fed wind-power generator set; (3) building a grid-integration testing system of the doubly-fed wind-power generator set; and (4) setting up a testing system for multiple wind-power generator sets, wherein in the step (2), the equivalent model of the doubly-fed wind-power generator set is built on the basis of characteristics of a controlled voltage source of an alternating-current side and a controlled current source of a direct-current side of the frequency converter of the doubly-fed wind-power generator set. By the aid of the simulation modeling method, transient-state characteristics of the doubly-fed wind-power generator set can be simulated accurately, and different characteristics and mutual affection among multiple wind-power generator sets can be computed. High-frequency on and off of fully-controlled devices cannot be taken into consideration, and simulation efficiency is improved greatly. The more the wind-power generator sets are simulated, the more evidently the efficiency is improved, simulation step-length can be increased on the premise of guaranteeing accuracy, and simulation efficiency is improved greatly.

Description

technical field [0001] The invention belongs to the field of power systems, and in particular relates to a simulation modeling method for equivalent simulation of a double-fed fan. Background technique [0002] Wind power: It is the abbreviation of wind power generation or wind power generation. Belong to renewable energy, clean energy. Wind power generation is an important form of wind energy utilization. Wind energy is a renewable, pollution-free, high-energy, and promising energy source. It is a strategic choice for all countries in the world to vigorously develop clean energy. The existing wind power market is rapidly developing from decentralized, small-scale development, and local consumption to large-scale, highly concentrated development, and long-distance, high-voltage transmission. However, due to the randomness of wind farm output and various operating modes, large-scale wind farms connected to the grid will have a negative impact on the power quality of the gri...

AI Technical Summary

Problems solved by technology

The wind farm is simulated by a single wind turbine, which cannot take into account the different characteristics and mutual influence between multiple wind turbines

Establish a detailed model including doubly-fed generators, frequency converters, and control systems. The simulation results are relatively accurate. However, due to the high switching frequency and slow calculation speed of the full-control devices in the frequency converter, the simulation consumes more power as the number of simulated fans increases. will grow non-linearly and rapidly

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