【摘要】：有源電力濾波器(Active Power Filter,APF)被公認(rèn)為是一種動(dòng)態(tài)抑制諧波、動(dòng)態(tài)補(bǔ)償無功功率的新型電力電子裝置。諧波指令電流的檢測(cè)、補(bǔ)償電流的產(chǎn)生和跟蹤控制以及APF容量的提高是限制其廣泛應(yīng)用的三大關(guān)鍵技術(shù)，本文將對(duì)這三個(gè)關(guān)鍵技術(shù)進(jìn)行研究。 快速準(zhǔn)確的諧波檢測(cè)是實(shí)現(xiàn)補(bǔ)償?shù)南葲Q條件�；谒矔r(shí)無功理論的ip-iq法雖然廣泛應(yīng)用，但是其復(fù)雜的坐標(biāo)變換和低通濾波器的設(shè)計(jì)影響了檢測(cè)的實(shí)時(shí)性。本文提出一種通過近似構(gòu)造基波電流來提取諧波電流的方法，即利用負(fù)載電流有效值等效替代其基波有效值，利用鎖相環(huán)獲取負(fù)載電流基波相位或電網(wǎng)電壓相位構(gòu)造基波電流。另外，，研究了其直流側(cè)電壓控制策略，進(jìn)一步分析了該算法的誤差補(bǔ)償和理論延時(shí)。最后，仿真和實(shí)驗(yàn)驗(yàn)證了該檢測(cè)算法和控制策略的可行性。 與此同時(shí)，補(bǔ)償電流是否有效的跟蹤控制，直接決定APF補(bǔ)償效果。傳統(tǒng)的滯環(huán)電流控制原理簡(jiǎn)單，動(dòng)態(tài)響應(yīng)快，可靠性高，魯棒性強(qiáng)，但是開關(guān)頻率不穩(wěn)定。本文采用一種基于空間矢量的滯環(huán)電流控制新方法，既保留了傳統(tǒng)滯環(huán)控制的優(yōu)點(diǎn)，又在一定程度上穩(wěn)定了開關(guān)頻率。通過與傳統(tǒng)滯環(huán)控制策略的仿真對(duì)比，證明了該方法的優(yōu)越性。 容量不足是限制APF運(yùn)用到大容量場(chǎng)合的關(guān)鍵因素之一，本文在綜合分析傳統(tǒng)兩電平和多電平APF的優(yōu)缺點(diǎn)的基礎(chǔ)上，采用兩電平多模塊APF并聯(lián)的方法，通過均流，不僅提升了總?cè)萘亢蛦蝹�(gè)APF的利用率，還有利于輸入電感的選型。另外，對(duì)模塊間是否存在環(huán)流進(jìn)行了理論分析。在理論分析基礎(chǔ)上建立了MATLAB仿真模型，結(jié)果驗(yàn)證了所述方法的有效性和分析的正確性。 最后，基于3模塊并聯(lián)的APF實(shí)驗(yàn)平臺(tái)，進(jìn)行了本文所提出的算法的驗(yàn)證，結(jié)果驗(yàn)證了所提算法的可行性和正確性。
[Abstract]:Active Power filter (Active Power Filter,APF) is recognized as a new type of power electronic device which can dynamically suppress harmonics and dynamically compensate reactive power. The detection of harmonic instruction current, the generation and tracking control of compensation current and the improvement of APF capacity are the three key technologies that limit its wide application. In this paper, these three key technologies will be studied. Fast and accurate harmonic detection is a prerequisite for compensation. Although the ip-iq method based on instantaneous reactive power theory is widely used, its complex coordinate transformation and the design of low-pass filter affect the real-time performance of detection. In this paper, a method of extracting harmonic current by approximate construction of fundamental current is proposed, that is, the effective value of load current is used to replace the effective value of fundamental wave, and the phase-locked loop is used to obtain the fundamental phase of load current or the voltage phase of power grid to construct the fundamental current. In addition, the DC side voltage control strategy is studied, and the error compensation and theoretical delay of the algorithm are further analyzed. Finally, the feasibility of the detection algorithm and control strategy is verified by simulation and experiment. At the same time, whether the compensation current is effective tracking control directly determines the compensation effect of APF. The traditional hysteretic current control principle is simple, the dynamic response is fast, the reliability is high, the robustness is strong, but the switching frequency is unstable. In this paper, a new method of hysteretic current control based on space vector is adopted, which not only preserves the advantages of traditional hysteretic control, but also stabilizes the switching frequency to a certain extent. Compared with the traditional hysteretic control strategy, the superiority of this method is proved. Insufficient capacity is one of the key factors that limit the application of APF to large capacity occasions. Based on the comprehensive analysis of the advantages and disadvantages of traditional two-level and multi-level APF, this paper adopts the method of two-level and multi-module APF in parallel, through current sharing. It not only improves the total capacity and the utilization rate of a single APF, but also facilitates the selection of input inductor. In addition, the existence of circulation between modules is analyzed theoretically. Based on the theoretical analysis, the MATLAB simulation model is established, and the results verify the effectiveness of the method and the correctness of the analysis. Finally, based on the three-module parallel APF experimental platform, the algorithm proposed in this paper is verified, and the results verify the feasibility and correctness of the proposed algorithm.
【學(xué)位授予單位】：中國礦業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TN713.8;TM761

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