本文選題：小水電機群 + 動態(tài)等值��； 參考：《電子科技大學》2014年碩士論文

【摘要】：水是清潔能源,而我國小水電資源的開發(fā)潛力躍居世界第一位,若能充分利用小水電就地發(fā)電、供電,以及就地成網的優(yōu)越性,將會對我國經濟和社會的可持續(xù)發(fā)展起到重要作用。眾多的小水電站接入電網之后,需要分析其對主網的影響�？紤]到小水電機群中機組數量較多,網絡結構較復雜,在仿真用電網模型中若詳盡的考慮每一臺小水電機組的具體參數,計算時可能會出現“維數災”問題,極大的降低仿真運算分析的效率。而且大量的小水電機組中可能會出現參數未知或不準確的情況,同時考慮到小水電機組出力受季節(jié)性影響較大,很難以用固定參數的模型去等值代替。所以,對區(qū)域小水電機群進行動態(tài)等值分析有著非常重要的現實意義,即把小水電機群當作外部系統(tǒng),視為一個整體分析其對研究系統(tǒng)的影響。本文中針對區(qū)域小水電機群集中上網的問題提出了一種動態(tài)等值建模方法,該方法是基于發(fā)電機同調等值和系統(tǒng)辨識的思想建立起小水電機群的等值模型,然后利用聯絡線上的動態(tài)潮流信息辨識出等值模型的參數,主要內容有以下幾點:(1)通過比較現有的動態(tài)等值方法和等值模型,針對區(qū)域小水電機群集中并網的問題,提出了一種動態(tài)等值建模方法,并詳細闡述了該方法的原理及思路。(2)通過歸納總結小水電機組的特點,提出了基于電氣距離的發(fā)電機群劃分方法,并建立了區(qū)域小水電機群的等值模型——虛擬同步發(fā)電機(VSG)模型,同時給出了模型的實用方程。(3)通過等值模型的數學方程,對模型參數的可辨識性進行了分析;提出了基于聯絡線動態(tài)潮流數據的參數辨識方法,詳細介紹了如何基于同步相量測量單元(PMU)的實測數據,轉換得到辨識所需的動態(tài)響應數據。(4)通過分析比較基本粒子群算法(PSO)中各參數的意義和作用,提出了一種采用更多粒子位置信息進行變異操作的改進粒子群優(yōu)化算法,利用改進的PSO辨識出VSG模型的參數;并通過編程得以實現,最后在單機系統(tǒng)中驗證了該算法的有效性。本文提出的動態(tài)等值建模方法已在IEEE10機39節(jié)點系統(tǒng)中進行了驗證,同時也對實際的四川電網區(qū)域小水電機群進行了仿真分析,結果表明了該建模方法的可行性,為區(qū)域發(fā)電機群的在線動態(tài)等值建模奠定了基礎。
[Abstract]:Water is a clean energy source, and the potential of small hydropower resources in China has leapt to the first place in the world. If we can make full use of small hydropower to generate electricity, supply electricity, and network locally, It will play an important role in the sustainable development of our economy and society. After many small hydropower stations are connected to the power grid, it is necessary to analyze its influence on the main network. Considering the large number of units in the small hydropower cluster and the complexity of the network structure, if the detailed parameters of each small hydropower unit are considered in detail in the simulation power network model, the problem of "dimension disaster" may occur in the calculation. The efficiency of simulation analysis is greatly reduced. Moreover, there may be unknown or inaccurate parameters in a large number of small hydropower units. Considering that the output force of small hydropower units is greatly affected by seasonality, it is difficult to replace it with the model with fixed parameters. Therefore, it is of great practical significance to analyze the dynamic equivalence of regional small hydropower cluster, that is, to treat the small hydropower cluster as an external system and as a whole to analyze its influence on the research system. In this paper, a dynamic equivalent modeling method is proposed to solve the problem of centralized access to the network of regional small hydropower cluster. This method is based on the idea of generator homology equivalence and system identification to establish the equivalent model of small hydropower cluster. Then the parameters of the equivalent model are identified by using the dynamic power flow information on the tie-line. The main contents are as follows: (1) by comparing the existing dynamic equivalence methods and equivalent models, we aim at the problem of centralized grid connection of regional small hydropower clusters. In this paper, a dynamic equivalent modeling method is proposed, and the principle and train of thought of this method are described in detail. By summing up the characteristics of small hydropower units, a method of generator group partition based on electrical distance is put forward. An equivalent model of regional small hydropower cluster, virtual synchronous generator (VSGG) model, is established. At the same time, the practical equation of the model is given, and the identifiability of the model parameters is analyzed through the mathematical equation of the equivalent model. A parameter identification method based on tie-line dynamic power flow data is proposed, and how to measure the measured data based on synchronous phasor measurement unit (PMU) is introduced in detail. By analyzing and comparing the significance and function of the parameters in PSO, an improved particle swarm optimization (PSO) algorithm using more information of particle position for mutation operation is proposed. The parameters of VSG model are identified by improved PSO, and realized by programming. Finally, the validity of the algorithm is verified in a single computer system. The dynamic equivalent modeling method proposed in this paper has been verified in the IEEE 10 machine 39 bus system. At the same time, the simulation analysis of the small hydropower cluster in Sichuan power network area has also been carried out. The results show that the method is feasible. It lays a foundation for online dynamic equivalent modeling of regional generator group.
【學位授予單位】：電子科技大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TV742;TV734

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本文編號：2041941