Research method of influence of doubly-fed wind turbines on low-frequency oscillation of interconnected power system
A technology for doubly-fed wind turbines and power systems, which is used in wind power generation, reducing/preventing power oscillation, and electrical digital data processing.
Active Publication Date: 2015-12-02
STATE GRID CORP OF CHINA +4
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As far as we know, so far, there have been no reports on the overall research on the influence of factors such as transmission distance and inter-regional power transmission on the low-frequency oscillation characteristics of power systems after wind power grid-connected
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[0015] The research method of the impact of double-fed wind turbines on the low-frequency oscillation characteristics of interconnected power systems is based on the calculation of characteristic roots and dynamic time-domain simulation under different operating conditions, including the following steps:
[0016] Step1: Divide the transmission side and the power receiving side in the regional interconnection system. Based on the simple interconnection system composed of two equivalent generators, the speed increment and power angle increment of the two generators are sinusoidal at the same frequency and anti-phase when the system is in low-frequency oscillation. Oscillation characteristics, calculation of low-frequency characteristics of simple interconnected systems;
[0017] Step2: Based on the complete detailed model of the doubly-fed wind turbine system, derive the state space equation of the interconnected power system when the wind farm is connected to the transmission si...
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The invention relates to a research method for the influence of a doubly-fed wind turbine generator set on interconnected electric power system low frequency oscillation. The research method comprises the steps of (1) simplifying regional systems into a simple interconnected system composed of two equivalent electric generators, dividing an electricity sending side and an electricity receiving side, and determining the low frequency characteristic of the interconnected system; (2) on the basis of two mass module shafting models, analyzing a transmission system model of the doubly-fed wind turbine generator set; (3) on the basis of the complete model of the doubly-fed wind turbine generator set, qualitatively analyzing the damping characteristic changing situation of the two regional interconnected systems before and after wind turbine generator set grid connection; (4) according to an overhead power transmission line, designing technical specifications, researching the influence of different wind electricity access network transmission distances on damping characteristics, and researching the influence of the doubly-fed wind turbine generator set on interconnected electric power system low frequency oscillation characteristics by the adoption of a characteristic root analysis and dynamic time-domain simulation method. According to the research method for the influence of the doubly-fed wind turbine generator set on the interconnected electric power system low frequency oscillation, a reference is provided for interconnected system wind power plant access network planning and design and comprehensive and systematic inter-regional oscillating characteristic analysis.
Description
technical field [0001] The invention relates to a research method for studying the influence of a doubly-fed wind generator set on low-frequency oscillation characteristics of an interconnected power system. Background technique [0002] Since the implementation of the interconnection project between large regional power systems in 2001, the Northeast-North China, Sichuan-Chongqing-Central China, Fujian-East China, Northeast-North China-Central China-Sichuan-Chongqing-Shandong and other interconnection projects have been put into operation. Enter the stage of rapid development. At the same time, wind energy has been highly valued by countries all over the world for its advantages in alleviating the energy crisis, protecting the environment, and promoting sustainable development of energy and the environment. Wind power technology is gradually becoming mature, and more and more large Medium-sized wind farms have been built one after another and connected to the power system....
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IPC IPC(8): H02J3/38H02J3/24G06F19/00
CPCY02E10/763Y02E10/76
Inventor 林因和萍文福拴
Owner STATE GRID CORP OF CHINA