【摘要】：隨著電力電子技術(shù)的快速發(fā)展,電網(wǎng)中的敏感負(fù)荷日益增多,電力用戶對電能質(zhì)量的要求也越來越高。電能質(zhì)量的保障是電網(wǎng)安全經(jīng)濟(jì)生產(chǎn)的前提,而電壓暫降則是電網(wǎng)中頻發(fā)的電能質(zhì)量問題,波及范圍廣,危害程度高。目前,動態(tài)電壓恢復(fù)器是抑制電壓暫降問題的最有效的手段之一。首先,本文根據(jù)動態(tài)電壓恢復(fù)器的工作原理,對動態(tài)電壓恢復(fù)器拓?fù)浣Y(jié)構(gòu)進(jìn)行了研究。其中,主要介紹了動態(tài)電壓恢復(fù)器的幾種典型拓?fù)?并分析不同類型的拓?fù)涞奶攸c及應(yīng)用場合。在此基礎(chǔ)上,對動態(tài)動態(tài)電壓恢復(fù)器進(jìn)行數(shù)學(xué)描述,建立相應(yīng)的數(shù)學(xué)模型,從而得到動態(tài)電壓恢復(fù)器的等效傳遞函數(shù)。其次,在電壓檢測方面,采用基于求導(dǎo)法的單相αβ-dq派克變換電壓幅值和相角的檢測方法,這種算法適用于單相電壓的檢測,計算量較小。在正負(fù)零序電壓的分離方面,基于雙向旋轉(zhuǎn)的派克變換對正負(fù)序分離進(jìn)行了分離,對于零序分離采用了三相疊加法。在鎖相技術(shù)方面,分別對開環(huán)鎖相和閉環(huán)鎖相技術(shù)原理進(jìn)行了分析。然后,對于動態(tài)電壓恢復(fù)器的控制回路,采用比例諧振控制器控制下的復(fù)合控制策略,通過該控制策略的頻域特性曲線,分析了該控制策略的優(yōu)點。同時,對比例諧振控制器進(jìn)行了改進(jìn),使其選頻特性更加靈活,從而具有諧波補(bǔ)償功能。最后,通過MATLAB/Simulink建模仿真,在復(fù)合控制策略的基礎(chǔ)上,分別對電網(wǎng)電壓跌落、相位移動、諧波干擾等的補(bǔ)償問題進(jìn)行了模擬實驗,驗證了該控制策略的合理性。與此同時,結(jié)合實際工程的DVR應(yīng)用現(xiàn)狀,說明DVR在實際抑制電壓暫降問題的實用型和經(jīng)濟(jì)性。
[Abstract]:With the rapid development of power electronics technology, the sensitive load in power grid is increasing day by day. The guarantee of power quality is the premise of safe and economical production of power grid, and voltage sag is a frequent power quality problem in the power network, which has a wide range of spread and high degree of harm. At present, dynamic voltage restorer is one of the most effective methods to restrain voltage sag. Firstly, according to the principle of dynamic voltage restorer, the topology of dynamic voltage restorer is studied. Among them, several typical topologies of dynamic voltage restorer are introduced, and the characteristics and applications of different types of topologies are analyzed. On this basis, the mathematical description of the dynamic voltage restorer is carried out, and the corresponding mathematical model is established, and the equivalent transfer function of the dynamic voltage restorer is obtained. Secondly, in the aspect of voltage detection, the single-phase 偽 尾 -dq Parker transform voltage amplitude and phase angle detection method based on the derivation method is adopted. This algorithm is suitable for the detection of single-phase voltage, and the calculation is relatively small. For the separation of positive and negative zero-sequence voltages, the positive-negative sequence separation is separated based on the bidirectional rotation Pike transform, and the three-phase superposition method is used for the zero-sequence separation. In the aspect of phase locking technology, the principle of open loop phase locking and closed loop phase locking are analyzed respectively. Then, for the control loop of dynamic voltage restorer, the compound control strategy under the control of proportional resonance controller is adopted, and the advantages of the control strategy are analyzed through the frequency domain characteristic curve of the control strategy. At the same time, the proportional resonance controller is improved to make its frequency selection more flexible, so it has harmonic compensation function. Finally, through MATLAB/Simulink modeling and simulation, based on the compound control strategy, the simulation experiments of voltage drop, phase shift and harmonic interference compensation are carried out respectively, and the rationality of the control strategy is verified. At the same time, combined with the application status of DVR in practical engineering, the practical and economical application of DVR in restraining voltage sag is demonstrated.
【學(xué)位授予單位】：華北電力大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TM714.2;TM761

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