本文關(guān)鍵詞：NPC型三電平半橋并網(wǎng)逆變器研究　出處：《南京航空航天大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 中點(diǎn)箝位 三電平半橋 并網(wǎng)逆變器 損耗分布 自平衡 均壓控制 LCL濾波器

【摘要】：太陽能是目前利用比較廣泛的新能源之一，光伏發(fā)電的容量及規(guī)模在不斷地?cái)U(kuò)大。中點(diǎn)箝位(Neutral Point Clamped, NPC)型三電平半橋拓?fù)溆捎诮Y(jié)構(gòu)及控制相對(duì)簡(jiǎn)單，在高壓大容量光伏并網(wǎng)逆變系統(tǒng)中應(yīng)用廣泛。本文主要研究單相NPC型三電平半橋逆變器的開關(guān)器件損耗分布、直流側(cè)電容均壓控制策略及其光伏并網(wǎng)逆變技術(shù)，其中，直流側(cè)電容均壓控制是需要解決的首要問題。 本文詳細(xì)分析了3種衍生NPC型三電平半橋拓?fù)?三電平有源NPC (Three-levelActive NPC,3L-ANPC)，三電平層疊NPC (Three-level Stacked NPC,3L-SNPC)，三電平有源層疊NPC(Three-level Active and Stacked NPC,3L-ASNPC))的零電平續(xù)流路徑的特點(diǎn)，分別總結(jié)了4種SPWM調(diào)制策略。在此基礎(chǔ)上，研究了各調(diào)制策略對(duì)NPC型拓?fù)溟_關(guān)器件損耗分布的影響，與傳統(tǒng)3L-NPC拓?fù)湎啾�，衍生NPC型拓?fù)浣Y(jié)構(gòu)及其SPWM調(diào)制策略的變化不僅可以改善開關(guān)器件損耗分布的均衡程度，而且開關(guān)器件的總損耗基本不變。根據(jù)各拓?fù)溟_關(guān)器件損耗分布的特點(diǎn)可得：傳統(tǒng)3L-NPC拓?fù)溥m用于中小功率場(chǎng)合；3L-ANPC拓?fù)洳灰渍{(diào)節(jié)開關(guān)器件的損耗；3L-SNPC拓?fù)湟子诟纳崎_關(guān)器件的損耗分布，適用于大功率場(chǎng)合；3L-ASNPC拓?fù)浣Y(jié)構(gòu)復(fù)雜，無明顯優(yōu)勢(shì)。 本文從頻域和時(shí)域角度詳細(xì)分析了3L-NPC拓?fù)渲绷鱾?cè)電容電壓的自平衡特性，即當(dāng)存在電容壓差時(shí)，電容電流中將產(chǎn)生相應(yīng)的直流分量來消除電容壓差，該直流分量主要來源于橋臂輸出電流的直流分量及開關(guān)頻率附近的偶次諧波分量。根據(jù)自平衡特性，本文總結(jié)了兩類均壓控制思想：A)直接或間接地對(duì)電容壓差進(jìn)行閉環(huán)控制，消除引起電容電壓不均衡的因素；B)采用恰當(dāng)?shù)恼{(diào)節(jié)器或控制結(jié)構(gòu)，以保證閉環(huán)控制時(shí)3L-NPC依然具有自平衡特性。其中，B類均壓控制策略無需檢測(cè)電容電壓，可簡(jiǎn)化系統(tǒng)控制，降低系統(tǒng)成本。 本文搭建了5kW NPC型三電平半橋逆變器的統(tǒng)一實(shí)驗(yàn)平臺(tái)，該平臺(tái)采用LCL濾波器以及基于電容電流比例反饋的雙電流閉環(huán)并網(wǎng)控制策略。通過Saber軟件仿真及對(duì)統(tǒng)一實(shí)驗(yàn)平臺(tái)的實(shí)驗(yàn)研究，分別驗(yàn)證了4種SPWM調(diào)制策略及A類和B類均壓控制策略的可行性；通過對(duì)比各NPC型拓?fù)涞牟⒕W(wǎng)效率，驗(yàn)證了NPC型拓?fù)浣Y(jié)構(gòu)及SPWM調(diào)制策略的變化對(duì)系統(tǒng)的總體效率基本沒有影響，，與理論分析相吻合。
[Abstract]:Solar energy is one of the new energy sources which is widely used at present. The capacity and scale of photovoltaic power generation is expanding continuously. Neutral Point Clamped is clamped at the midpoint. NPC-type three-level half-bridge topology is relatively simple because of its structure and control. It is widely used in high voltage and large capacity photovoltaic grid-connected inverter system. This paper mainly studies the switching device loss distribution of single-phase NPC three-level half-bridge inverter. DC side capacitor voltage equalizing control strategy and photovoltaic grid-connected inverter technology, among which, DC side capacitance voltage sharing control is the most important problem to be solved. In this paper, three kinds of derived NPC three-level active NPC3L-ANPCs (three-level active NPC-NPC-3L-ANPCs) are analyzed in detail. Three-level Stacked NPC-3L-SNPC). The characteristics of zero-level continuation paths of three-level active cascading NPC(Three-level Active and Stacked NPC-3L-ASNPCs. Four kinds of SPWM modulation strategies are summarized respectively. On this basis, the effects of each modulation strategy on the loss distribution of NPC topology switching devices are studied, compared with the traditional 3L-NPC topology. The variation of derivative NPC topology and its SPWM modulation strategy can not only improve the loss distribution equalization of switching devices. According to the characteristics of the loss distribution of each topology switch device, the traditional 3L-NPC topology is suitable for medium and small power situations; 3L-ANPC topology is not easy to adjust the loss of switch devices; 3L-SNPC topology is easy to improve the loss distribution of switching devices and is suitable for high-power applications. The topological structure of 3 L-ASNPC is complex and has no obvious advantage. In this paper, the self-balancing characteristics of DC side capacitor voltage of 3L-NPC topology are analyzed in detail in frequency domain and time domain, that is, when there is capacitance voltage difference. A corresponding DC component will be produced in the capacitor current to eliminate the capacitance voltage difference. The DC component is mainly derived from the DC component of the output current of the bridge arm and the even harmonic component near the switching frequency. In this paper, two kinds of equalizing voltage control ideas: 1 A) are summarized to control the capacitance voltage difference directly or indirectly, to eliminate the factors that cause the capacitance voltage imbalance. B) A proper regulator or control structure is adopted to ensure that 3L-NPC still has self-balancing characteristics in closed-loop control. Class B voltage equalization control strategy does not need to detect capacitance voltage, so it can simplify the system control. Reduce system cost. In this paper, a unified experimental platform of 5kW NPC three-level half-bridge inverter is built. The platform adopts LCL filter and double-current closed-loop grid-connected control strategy based on capacitive current proportional feedback. The simulation of Saber software and the experimental research on the unified experimental platform are carried out. The feasibility of four SPWM modulation strategies and the A and B voltage sharing control strategies are verified respectively. By comparing the grid connection efficiency of each NPC topology, it is verified that the variation of NPC topology and SPWM modulation strategy has no effect on the overall efficiency of the system, which is consistent with the theoretical analysis.
【學(xué)位授予單位】：南京航空航天大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM464

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