本文選題：電壓暫降 + 動態(tài)電壓恢復器�。� 參考：《燕山大學》2014年碩士論文

【摘要】：隨著科學技術(shù)的突飛猛進和工業(yè)規(guī)模的發(fā)展壯大，大量精密復雜的敏感性用電設(shè)備已被廣泛的應(yīng)用到社會各個領(lǐng)域。電能質(zhì)量中任何問題都可能導致這些設(shè)備非正常工作，以致產(chǎn)生較大的經(jīng)濟損失。因此，有效地改善電能質(zhì)量是社會進步的必然要求。在眾多電能質(zhì)量問題中，電壓暫降對用電設(shè)備造成的危害最為普遍。動態(tài)電壓恢復器(Dynamic Voltage Restorer)能在幾個毫秒內(nèi)瞬間動作，快速消除電壓暫降的影響，保證負載可靠的運行。由于有著良好的動態(tài)性能和很高的性價比，動態(tài)電壓恢復器已成為改善電能質(zhì)量問題的最為有效、經(jīng)濟的電力裝置。 本文對動態(tài)電壓恢復器的工作原理和拓撲結(jié)構(gòu)做了詳細的分析，并且對電壓暫降的檢測方法和動態(tài)電壓恢復器的補償策略以及控制模式進行了深入的研究。通過采用基于瞬時無功理論及其改進方案來準確、快速地檢測不同類型電壓暫降的幅值和相位的變化，并且建立仿真模型驗證了這種方法能夠滿足檢測要求。針對動態(tài)電壓恢復器的逆變環(huán)節(jié)采用恒功率和恒壓恒頻兩種控制模式，并且結(jié)合正弦波脈寬調(diào)制技術(shù)(Sinusoidal Pulse With Modulation)來建立逆變器的仿真模型，使動態(tài)電壓恢復器輸出穩(wěn)定的正弦波電壓，保證其對系統(tǒng)的電壓暫降進行可靠補償。 根據(jù)動態(tài)電壓恢復器輸出電壓、電流及功率的關(guān)系，歸納出完全補償法、同相位補償法和最小能量補償法三種常見的補償策略，并且對最小能量補償法在不同的補償條件下進一步展開討論，最終得到了動態(tài)電壓恢復器輸出有功功率與負載功率因數(shù)之間的關(guān)系，即降低負載功率因數(shù)將可以減少動態(tài)電壓恢復器的有功輸出�；诖私Y(jié)論，對于補償系統(tǒng)的結(jié)構(gòu)加以改進，即在敏感負載端并聯(lián)一個帶有開關(guān)裝置的電抗器，當動態(tài)電壓恢復器對系統(tǒng)進行補償時投入使用，暫時減少負載功率因數(shù)，來保證動態(tài)電壓恢復器有效地補償。最后構(gòu)建仿真模型，，通過對仿真結(jié)果進行分析，驗證了并聯(lián)電抗器可以對負載功率因數(shù)進行控制，減少了動態(tài)電壓恢復器能量輸出，提高了補償范圍，延長了補償時間。
[Abstract]:With the rapid development of science and technology and the development of industrial scale, a large number of sophisticated sensitive electrical equipment has been widely used in various fields of society. Any problems in power quality may lead to abnormal operation of these devices, resulting in large economic losses. Therefore, the effective improvement of power quality is the inevitable requirement of social progress. Among many power quality problems, voltage sag is the most common hazard to electric equipment. Dynamic Voltage Restorer can be used in several milliseconds to eliminate the influence of voltage sag and ensure the reliable operation of the load. Because of its good dynamic performance and high performance-price ratio, dynamic voltage restorer has become the most effective and economical power device to improve power quality. In this paper, the working principle and topology of dynamic voltage restorer are analyzed in detail, and the detection method of voltage sag, compensation strategy and control mode of dynamic voltage restorer are studied deeply. Based on the instantaneous reactive power theory and its improved scheme, the amplitude and phase of different voltage sag are detected accurately and quickly, and the simulation model is established to verify that this method can meet the detection requirements. Two control modes, constant power and constant voltage and constant frequency, are adopted in the inverter of dynamic voltage restorer, and the simulation model of inverter is established by using sinusoidal pulse with modulation technology. The dynamic voltage restorer outputs a stable sinusoidal voltage to compensate the voltage sag reliably. According to the relationship among output voltage, current and power of dynamic voltage restorer, three common compensation strategies, complete compensation method, in-phase compensation method and minimum energy compensation method, are summarized. The relationship between the active power output of the dynamic voltage restorer and the load power factor is obtained by further discussing the minimum energy compensation method under different compensation conditions. That is to say, the active power output of the dynamic voltage restorer can be reduced by reducing the load power factor. Based on this conclusion, the structure of the compensation system is improved, that is, a reactor with switch device is connected at the sensitive load end, when the dynamic voltage restorer compensates the system, the load power factor is temporarily reduced. To ensure that the dynamic voltage restorer is effectively compensated. Finally, the simulation model is constructed and the simulation results are analyzed to verify that the parallel reactor can control the load power factor, reduce the energy output of the dynamic voltage restorer, improve the compensation range and prolong the compensation time.
【學位授予單位】：燕山大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TM761.12

【參考文獻】

相關(guān)期刊論文 前10條

1 葉傅華;陳國棟;宋晉峰;周悅;;10kV動態(tài)電壓恢復器及其整流控制策略[J];大功率變流技術(shù);2011年04期

2 孫醒濤;孫力;張云;康爾良;;一種新型電壓型逆變器拓撲結(jié)構(gòu)及其PWM控制方法[J];電工技術(shù)學報;2008年07期

3 張強;周暉;齊智平;;適用于動態(tài)電壓恢復器電壓檢測的濾波算法[J];電工技術(shù)學報;2009年08期

4 陶順;肖湘寧;;電力系統(tǒng)電能質(zhì)量評估體系架構(gòu)[J];電工技術(shù)學報;2010年04期

5 鄭常寶;陳權(quán);張力;王群京;;基于Delta逆變技術(shù)的三相動態(tài)電壓恢復器研制[J];電力電子技術(shù);2010年10期

6 曹長松;李曼;;逆變器SPWM載波頻率選取的計算方法[J];電力電子技術(shù);2012年05期

7 尹忠東,張衛(wèi)華,韓民曉;動態(tài)電壓恢復器注入變壓器過飽和抑制[J];電力系統(tǒng)自動化;2004年24期

8 王同勛;薛禹勝;S.S.CHOI;;動態(tài)電壓恢復器研究綜述[J];電力系統(tǒng)自動化;2007年09期

9 劉云潺;黃純;歐立權(quán);趙偉明;;基于dq變換的三相不平衡電壓暫降檢測方法[J];電力系統(tǒng)及其自動化學報;2007年03期

10 蔡林海;荊平;武守遠;李惠勛;;動態(tài)電壓恢復器控制策略研究[J];電力自動化設(shè)備;2007年11期

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