本文選題：諧波電流 + 瞬時功率理論��； 參考：《蘭州交通大學》2014年碩士論文

【摘要】：隨著電力電子技術的發(fā)展，電網(wǎng)中的非線性負荷越來越多，電流波形畸變也日益嚴重，如果不加以治理將嚴重影響電力系統(tǒng)的安全、穩(wěn)定運行。因此，對電力系統(tǒng)諧波電流采取實時檢測和必要地抑制措施，是保證電力系統(tǒng)安全、穩(wěn)定運行亟待解決的重要課題之一。 為了系統(tǒng)地研究基于瞬時功率理論的諧波電流檢測及抑制方法，論文首先分析了電力系統(tǒng)諧波的概念、表示形式、衡量指標、危害以及電網(wǎng)中的主要諧波源。在此基礎上，引入瞬時功率理論的定義和相關結(jié)論，并將瞬時功率理論應用于諧波電流檢測法，從而得到p-q檢測法和ip-iq檢測法。論文分別采用理論推導和仿真實驗的方法研究了p-q檢測法在電網(wǎng)電壓有、無畸變的三相三線制系統(tǒng)和ip-iq檢測法在電網(wǎng)電壓有畸變的三相三線制系統(tǒng)、三相四線制系統(tǒng)和單相系統(tǒng)中的應用。其中，p-q檢測法只能在電網(wǎng)電壓無畸變時準確地檢測出電網(wǎng)中的諧波電流，當電網(wǎng)電壓有畸變時檢測結(jié)果是有誤差的；而ip-iq檢測法在電路的各種運行狀態(tài)下都能獲得令人滿意的檢測效果，因此ip-iq檢測法比p-q檢測法具有更加廣闊的應用空間。另外，無論是基于p-q檢測法還是ip-iq檢測法構(gòu)造的諧波電流檢測電路，其中的低通濾波器都是影響諧波電流檢測效果的重要因素，因此，論文詳細分析了低通濾波器的類型、階數(shù)和截止頻率對ip-iq檢測法檢測效果的影響，為選擇低通濾波器提供了依據(jù)和參考。 采用基于瞬時功率理論的有源電力濾波器檢測和抑制諧波電流是治理電力系統(tǒng)諧波電流的最有效方法之一。論文在分析了有源電力濾波器的基本原理和接入方式的基礎上，對并聯(lián)型有源電力濾波器的主電路結(jié)構(gòu)進行了較詳細地研究。最后，論文提出了一種基于瞬時功率理論的并聯(lián)型三相三線制有源電力濾波器設計方案，并重點研究了硬件設計和控制策略兩個方面的問題，為基于瞬時功率理論的有源電力濾波器實用化奠定了一定的基礎。在硬件設計方面，重點研究了電流、電壓檢測電路，過零檢測電路，采樣周期信號產(chǎn)生電路，AD轉(zhuǎn)換電路及主電路等關鍵性環(huán)節(jié)。在控制策略方面，，重點研究了補償電流滯環(huán)控制和直流側(cè)電壓控制的具體工作過程。
[Abstract]:With the development of power electronics technology, there are more and more nonlinear loads in the power network, and the distortion of current waveform is becoming more and more serious. If not treated, the safety and stability of power system will be seriously affected. Therefore, it is an important task to ensure the safety and stability of power system to take real-time detection and necessary suppression measures for harmonic current in power system. In order to systematically study the harmonic current detection and suppression method based on instantaneous power theory, this paper first analyzes the concept, representation, measurement index, harm and main harmonic sources of power system harmonics. On this basis, the definition and relevant conclusions of instantaneous power theory are introduced, and the instantaneous power theory is applied to the harmonic current detection method to obtain p-q detection method and ip-iq detection method. In this paper, the method of theoretical derivation and simulation experiment are used to study the three-phase three-wire system with p-q detection method and three-phase three-wire system with no distortion in the grid voltage, and the three-phase three-wire system with ip-iq detection method with voltage distortion in the power network. Application of three-phase four-wire system and single-phase system. The p-q detection method can only accurately detect the harmonic current in the power network when the voltage is not distorted, and there are errors in the detection results when the voltage is distorted. However, the ip-iq detection method can obtain satisfactory detection results under various operating states of the circuit, so the ip-iq detection method has a wider application space than the p-q detection method. In addition, whether based on p-q detection method or ip-iq detection method, the low pass filter is an important factor that affects the harmonic current detection effect. Therefore, the type of low pass filter is analyzed in detail. The influence of order and cutoff frequency on the detection effect of ip-iq detection method provides the basis and reference for selecting low pass filter. Detection and suppression of harmonic current by active power filter based on instantaneous power theory is one of the most effective methods to control harmonic current in power system. On the basis of analyzing the basic principle and access mode of active power filter, the main circuit structure of shunt active power filter is studied in detail in this paper. Finally, a design scheme of shunt three-phase three-wire active power filter based on instantaneous power theory is proposed, and two aspects of hardware design and control strategy are studied. It lays a foundation for the practical application of active power filter based on instantaneous power theory. In the aspect of hardware design, the key links such as current, voltage detection circuit, zero-crossing detection circuit, sampling period signal generation circuit, AD conversion circuit and main circuit are studied. In the aspect of control strategy, the detailed working process of compensation current hysteresis control and DC side voltage control is studied.
【學位授予單位】：蘭州交通大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TM711

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本文編號：2011464