300MW雙饋風(fēng)電場(chǎng)STATCOM裝置容量配置的研究
[Abstract]:Due to the planning and construction of large-scale wind power system, the influence of grid connection of wind farm is more and more serious, including the problem of voltage stability of wind farm and network. In actual engineering construction, it is necessary for the configuration of reactive power compensator capacity of doubly-fed wind farm to meet the requirements of doubly-fed wind farm and to give consideration to economy. In this paper, STATCOM and DFIG are taken as the research objects, and the operation principle, mathematical model and control strategy of both are studied and analyzed in detail. Based on the mathematical model proposed in MATLAB/Simulink simulation environment, a doubly-fed wind farm model with STATCOM device is built, and a rotor side converter control model using stator flux linkage directional vector control is established. The grid-side converter control model, propeller pitch control model and STATCOM controller model including voltage control and reactive power control are adopted in this paper. On the basis of this, the grid-connected simulation analysis of DFIG and STATCOM devices is carried out, respectively. The correctness of the model is verified. This paper presents a method to determine the capacity of the STATCOM device in a doubly-fed wind farm. This method first estimates the reactive power loss of the doubly-fed wind farm, and then carries out a simplified power flow calculation based on the parameters of the doubly-fed wind farm. Thus, the configuration capacity of the STATCOM device is determined. On this basis, other factors affecting the capacity configuration of the STATCOM unit in a doubly-fed wind farm are further discussed, including wind farm output, grid voltage drop, transmission line length, And the variation of output reactive power when the STATCOM device with different capacity is configured. The results show that with the increase of wind farm output, the demand for reactive power of wind farm increases. To some extent, the voltage drop of power grid is linearly related to the reactive power required to maintain the voltage stability of PCC points. The demand for reactive power in the system increases with the length of transmission line and the increasing potential will slow down gradually. When the electrical characteristics of the power network are fixed, the output reactive power of the system will be approximately saturated with the increase of the configuration capacity of the STATCOM device. In this paper, a method is proposed to determine the capacity of the STATCOM device, and the correctness of the proposed method is verified by comparing it with the capacity of the actual 300MW doubly-fed wind farm. This paper further explores the other factors that affect the capacity configuration of the STATCOM unit in a doubly-fed wind farm, which provides a basis for the allocation of reactive power compensation capacity, and also provides guidance for improving the economy of the reactive power compensation scheme in a doubly-fed wind farm.
【學(xué)位授予單位】:昆明理工大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類(lèi)號(hào)】:TM614;TM761.12
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