本文選題：孤島 + 風(fēng)電機(jī)組�。� 參考：《中國電力科學(xué)研究院》2017年碩士論文

【摘要】：傳統(tǒng)的孤島研究大多關(guān)注的是光伏發(fā)電系統(tǒng)的孤島在線識別,目前光伏發(fā)電系統(tǒng)孤島在線識別無論是理論上還是實際設(shè)備生產(chǎn)技術(shù)上都已經(jīng)比較成熟。但人們對風(fēng)電機(jī)組的孤島保護(hù)關(guān)注很少。本文首先通過實驗驗證主流風(fēng)電機(jī)組單機(jī)和混合系統(tǒng)在輸出功率、電網(wǎng)阻抗特性變化條件下所發(fā)生的孤島現(xiàn)象,分析風(fēng)電機(jī)組發(fā)生孤島運行前后輸出有功、無功、電壓、頻率等電氣量變化特性,以說明對風(fēng)電機(jī)組孤島在線識別策略研究的必要性。并且針對風(fēng)電機(jī)組的孤島問題提出一種基于無功功率擾動的適用于全功率變頻風(fēng)電機(jī)組和雙饋風(fēng)電機(jī)組孤島在線識別方法,該方法不僅對傳統(tǒng)注入定量無功功率擾動的方法進(jìn)行了改進(jìn),并且為了解決持續(xù)注入無功功率帶來的電能質(zhì)量惡化問題而引入無功功率注入的觸發(fā)信號——利用風(fēng)電機(jī)組輸出端電壓信號的總諧波畸變率的變化率作為觸發(fā)信號,實驗及仿真結(jié)果都驗證了該觸發(fā)信號的可行性。并且通過仿真驗證了該無功功率擾動方法應(yīng)用于全功率變頻風(fēng)電機(jī)組和雙饋風(fēng)電機(jī)組能夠快速對孤島進(jìn)行在線識別。然而,由于風(fēng)電機(jī)組裝機(jī)容量的不斷增加和我國風(fēng)電建設(shè)的集中式特點,此針對單機(jī)的孤島在線識別方法應(yīng)用于風(fēng)電場時可能由于不同風(fēng)電場間主動無功功率擾動參數(shù)的不同而導(dǎo)致孤島在線識別失敗,所以本文又仿真研究了更適用于風(fēng)電場的阻抗孤島在線識別方法,首先驗證了主動注入諧波擾動的方法在風(fēng)電場孤島在線識別中的適用性,然后又提出一種基于諧波阻抗測量的孤島在線識別方法,該方法對風(fēng)電場并網(wǎng)點處電壓電流不同頻率的分量進(jìn)行測量,并通過計算風(fēng)電場并網(wǎng)點諧波阻抗幅值對孤島進(jìn)行在線識別。
[Abstract]:The traditional islanding research mostly focuses on the islanding identification of photovoltaic power generation system. At present, the islanding identification of photovoltaic power generation system is mature both in theory and in practical equipment production technology. But people pay little attention to isolated island protection of wind turbine. In this paper, the phenomenon of isolated island occurred in the condition of output power and power grid impedance characteristics is verified by experiments, and the active power, reactive power and voltage of wind turbine are analyzed before and after the isolated island operation. The characteristics of frequency and other electrical variables are used to illustrate the necessity of on-line identification strategy for isolated islands of wind turbines. Aiming at the islanding problem of wind turbine, a method of island identification for wind turbine and doubly-fed wind turbine based on reactive power disturbance is proposed, which is suitable for full power conversion wind turbine and doubly-fed wind turbine. This method not only improves the traditional method of injecting quantitative reactive power disturbance, In order to solve the problem of power quality deterioration caused by continuous reactive power injection, the trigger signal of reactive power injection is introduced-the change rate of total harmonic distortion rate of output voltage signal of wind turbine is used as trigger signal. Both experimental and simulation results verify the feasibility of the trigger signal. The simulation results show that the proposed method can quickly identify isolated islands in full power variable frequency wind turbine and doubly-fed wind turbine. However, due to the increasing installed capacity of wind turbines and the centralized characteristics of wind power construction in China, When this method is applied to wind farm, it may lead to the failure of islanding on-line identification because of the different parameters of active reactive power disturbance among different wind farms. So this paper simulates and studies the impedance islanding identification method which is more suitable for wind farm. Firstly, the applicability of active injection harmonic disturbance method in wind farm islanding online identification is verified. Then a method of on-line identification of isolated islands based on harmonic impedance measurement is proposed. The method measures the components of different frequencies of voltage and current at the node of a wind farm. On-line identification of isolated islands is carried out by calculating wind farm and dot harmonic impedance amplitude.
【學(xué)位授予單位】：中國電力科學(xué)研究院
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TM614

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本文編號：2050751