【摘要】：隨著清潔能源的發(fā)展與風(fēng)電所占的比重增加,風(fēng)電基地對(duì)大電網(wǎng)的影響越來越大。動(dòng)態(tài)無功補(bǔ)償裝置發(fā)展歷史長,技術(shù)相對(duì)成熟。在風(fēng)電場中增加無功補(bǔ)償裝置能夠有效調(diào)節(jié)電網(wǎng)電壓,保持電網(wǎng)穩(wěn)定。低電壓是電網(wǎng)常出現(xiàn)的工況之一,故亟需一種控制策略,協(xié)調(diào)風(fēng)電基地中動(dòng)態(tài)無功補(bǔ)償和風(fēng)電場以適應(yīng)包括低電壓在內(nèi)的各種工況。 本研究從兩個(gè)角度切入：風(fēng)電基地與大電網(wǎng)出現(xiàn)各種工況的相互影響；風(fēng)電基地中,風(fēng)電機(jī)組與無功補(bǔ)償裝置的協(xié)調(diào)控制。 在靜態(tài)條件下,為滿足電網(wǎng)下達(dá)的電壓優(yōu)化曲線,明確酒泉風(fēng)電基地中無功補(bǔ)償裝置對(duì)電網(wǎng)的影響,在PSD-BPA中定量分析了配置的動(dòng)態(tài)無功補(bǔ)償裝置的容量與敦煌母線電壓之間的關(guān)系。在動(dòng)態(tài)條件下,明確幾種常見工況酒泉風(fēng)電基地中無功補(bǔ)償裝置對(duì)大電網(wǎng)的影響。在此基礎(chǔ)上,對(duì)不同無功補(bǔ)償裝置對(duì)大電網(wǎng)的影響的不同進(jìn)行定性分析,明確在三種典型工況中,低電壓情況下無功補(bǔ)償裝置的作用最為明顯,而在TCR/MCR型SVC, STATCOM三種無功補(bǔ)償中STATCOM的效果最好。 基于STATCOM的工作原理與雙饋風(fēng)機(jī)網(wǎng)側(cè)換流器的工作原理有相似之處,都能在一定的控制策略下向電網(wǎng)提供無功進(jìn)而調(diào)節(jié)電網(wǎng)電壓。故針對(duì)雙饋風(fēng)電場中STATCOM與低電壓穿越的影響提出協(xié)調(diào)控制策略,在PSCAD/EMTDC中建立仿真模型以驗(yàn)證協(xié)調(diào)控制策略能有效提高風(fēng)電場低電壓穿越能力。
[Abstract]:With the development of clean energy and the increasing proportion of wind power, wind power base has more and more influence on large power grid. Dynamic reactive power compensator has a long history and mature technology. Adding reactive power compensator in wind farm can effectively regulate the voltage of power grid and keep the power network stable. Low voltage is one of the most common conditions in power system, so a control strategy is urgently needed to coordinate dynamic reactive power compensation and wind farm in wind power base to adapt to all kinds of working conditions, including low voltage. In this paper, two aspects are discussed: the interaction between wind power base and large power grid, and the coordinated control between wind turbine and reactive power compensator in wind power base. Under static condition, in order to satisfy the voltage optimization curve of power grid, the influence of reactive power compensation device in Jiuquan wind power base on power grid is clarified. The relationship between the capacity of the dynamic reactive power compensator and the voltage of Dunhuang bus is quantitatively analyzed in PSD-BPA. Under dynamic conditions, the influence of reactive power compensation device on large power grid in several common conditions of Jiuquan wind power base is determined. On this basis, the effects of different reactive power compensators on large power grids are analyzed qualitatively. It is clear that in the three typical conditions, the effect of reactive power compensator is the most obvious in the case of low voltage. But in the TCR/MCR SVC, STATCOM three kinds of reactive power compensation, the best effect of STATCOM. The working principle based on STATCOM is similar to that of doubly-fed fan grid-side converter. Both of them can provide reactive power to the power network under certain control strategy and then adjust the network voltage. Therefore, a coordinated control strategy is proposed for the influence of STATCOM and low voltage traversing in doubly-fed wind farms, and a simulation model is established in PSCAD/EMTDC to verify that the coordinated control strategy can effectively improve the low-voltage traversing capability of wind farms.
【學(xué)位授予單位】：華北電力大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM614

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