本文關(guān)鍵詞：含風(fēng)電場(chǎng)電網(wǎng)的概率電壓穩(wěn)定性研究　出處：《上海電力學(xué)院》2014年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 風(fēng)力發(fā)電機(jī)組 小干擾電壓穩(wěn)定 概率特征根 電壓穩(wěn)定相關(guān)比

【摘要】：隨著風(fēng)力發(fā)電技術(shù)的不斷進(jìn)步，風(fēng)電場(chǎng)在系統(tǒng)中的比例不斷增加，風(fēng)電對(duì)電網(wǎng)電壓穩(wěn)定性的影響也越來(lái)越明顯。由于風(fēng)能的間歇性、隨機(jī)性等特點(diǎn)，電力系統(tǒng)處于不斷變化的運(yùn)行方式下，此時(shí)傳統(tǒng)的確定性分析方法已經(jīng)無(wú)法全面描述系統(tǒng)的電壓穩(wěn)定性。因此，本文采用概率法評(píng)估風(fēng)電并網(wǎng)對(duì)系統(tǒng)的電壓穩(wěn)定性的影響是十分有意義的。 含風(fēng)電場(chǎng)電力系統(tǒng)的概率潮流計(jì)算是概率電壓穩(wěn)定性研究的基礎(chǔ)，考慮了節(jié)點(diǎn)功率變化的系統(tǒng)多運(yùn)行方式，通過(guò)一次計(jì)算可以得到系統(tǒng)潮流的概率分布。在IEEE3機(jī)9節(jié)點(diǎn)系統(tǒng)上，本文用雙饋風(fēng)電機(jī)組組成的等值風(fēng)電場(chǎng)替代某輸出功率相同的同步發(fā)電機(jī)組，采用半不變量法進(jìn)行了概率潮流計(jì)算，并將潮流計(jì)算結(jié)果與蒙特卡羅模擬法計(jì)算結(jié)果進(jìn)行了比較分析。 本文采用小干擾分析法研究含風(fēng)電場(chǎng)電壓穩(wěn)定性，應(yīng)用PMT建模技術(shù)建立了適用于電力系統(tǒng)小干擾穩(wěn)定分析的電力系統(tǒng)網(wǎng)絡(luò)、負(fù)荷、同步發(fā)電機(jī)組和DFIG風(fēng)電機(jī)組完整模型，簡(jiǎn)化了電力網(wǎng)絡(luò)的狀態(tài)矩陣的形成過(guò)程。特別是雙饋感應(yīng)風(fēng)力發(fā)電機(jī)組部分，詳細(xì)推導(dǎo)和建立了其適用于小干擾穩(wěn)定分析的機(jī)電暫態(tài)線性化模型，包括感應(yīng)發(fā)電機(jī)模型、交直交變頻器模型、軸系模型、槳距角控制模型，以及其他文獻(xiàn)較少涉及的最大風(fēng)能跟蹤的風(fēng)功率模型和完整的變頻器控制系統(tǒng)模型。 在小干擾穩(wěn)定分析基礎(chǔ)上，采用概率法求出系統(tǒng)狀態(tài)矩陣所對(duì)應(yīng)的特征根的概率分布，找出系統(tǒng)的概率失穩(wěn)模式。本文提出電壓穩(wěn)定相關(guān)比，作為失穩(wěn)模式下區(qū)分電壓失穩(wěn)和功角失穩(wěn)的判據(jù)，將概率特征根分析法拓展到電壓穩(wěn)定性研究中。通過(guò)電壓失穩(wěn)模式系數(shù)找到電力系統(tǒng)電壓薄弱點(diǎn)，并在電壓薄弱點(diǎn)增設(shè)魯棒的SVC改善系統(tǒng)的電壓穩(wěn)定性。 最后，分別在IEEE3機(jī)9節(jié)點(diǎn)系統(tǒng)和八機(jī)系統(tǒng)上進(jìn)行了仿真分析，結(jié)果表明風(fēng)電場(chǎng)的接入增加了電力系統(tǒng)小干擾電壓失穩(wěn)的概率，，增設(shè)SVC可以在一定程度上改善系統(tǒng)的電壓穩(wěn)定性。
[Abstract]:With the development of wind power generation technology, the proportion of wind farm in the system is increasing, and the influence of wind power on the voltage stability of power grid is becoming more and more obvious. Under the changing operation mode of power system, the traditional deterministic analysis method can not fully describe the voltage stability of the system. In this paper, the probabilistic method is used to evaluate the influence of wind power grid connection on the voltage stability of the system. Probabilistic power flow calculation with wind farm power system is the basis of probabilistic voltage stability research. The probabilistic distribution of the system power flow can be obtained by one calculation. In the 9-bus system of IEEE3 generator, the equivalent wind farm composed of doubly-fed wind turbines is used to replace a synchronous generator set with the same output power. The semi-invariant method is used to calculate the probabilistic power flow, and the results of power flow calculation are compared with the results of Monte Carlo simulation. In this paper, the small disturbance analysis method is used to study the voltage stability of wind farm, and the PMT modeling technology is used to establish the power system network and load suitable for the small disturbance stability analysis of power system. The complete model of synchronous generator and DFIG wind turbine simplifies the forming process of state matrix of power network, especially the part of doubly-fed induction wind turbine. The electromechanical transient linearization model, including induction generator model, AC-DC converter model, shafting model and pitch angle control model, is derived and established in detail. And the wind power model of maximum wind tracking and the complete control system model of frequency converter are seldom mentioned in other literatures. On the basis of the small disturbance stability analysis, the probability distribution of the characteristic root corresponding to the state matrix of the system is obtained by using the probability method, and the probabilistic instability mode of the system is found. In this paper, the voltage stability correlation ratio is proposed. As a criterion to distinguish the voltage instability from the power angle instability in the unstable mode, the probabilistic eigenvalue analysis method is extended to the study of voltage stability. The voltage weakness of the power system is found by the voltage instability mode coefficient. A robust SVC is added to the voltage weakness to improve the voltage stability of the system. Finally, the simulation analysis is carried out on IEEE3 9-bus system and eight-bus system respectively. The results show that the access of wind farm increases the probability of small disturbance voltage instability in power system. The addition of SVC can improve the voltage stability of the system to some extent.
【學(xué)位授予單位】：上海電力學(xué)院
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM712

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