本文選題：NPC三電平逆變器 + SVPWM簡(jiǎn)化算法��； 參考：《華南理工大學(xué)》2014年碩士論文

【摘要】：多電平逆變器具有開關(guān)管承受的電壓應(yīng)力小、開關(guān)損耗小、諧波含量低、輸出波形質(zhì)量好等優(yōu)點(diǎn)，在中高壓大功率領(lǐng)域中得到廣泛應(yīng)用。三電平逆變器是構(gòu)建多電平逆變器的基礎(chǔ)，分析和研究三電平逆變器具有很重要的現(xiàn)實(shí)意義。而在三電平逆變器的多種控制策略中，空間矢量調(diào)制(SVPWM)算法具有調(diào)制范圍寬、直流側(cè)電壓利用率高、易于實(shí)現(xiàn)的優(yōu)點(diǎn)，所以本文設(shè)計(jì)了基于SVPWM的并網(wǎng)控制策略，本文內(nèi)容具體可以分為以下幾個(gè)方面。 分析了三電平逆變器的國(guó)內(nèi)外研究現(xiàn)狀，，可知二極管箝位式三電平結(jié)構(gòu)是出現(xiàn)最早，應(yīng)用場(chǎng)合最多的一種結(jié)構(gòu)，因此，選擇二極管箝位式(NPC)三電平逆變器作為研究對(duì)象，并對(duì)其拓?fù)浣Y(jié)構(gòu)和工作原理進(jìn)行詳細(xì)的分析。 針對(duì)傳統(tǒng)SVPWM計(jì)算量大、精度低的缺點(diǎn)，本文提出一種SVPWM簡(jiǎn)化算法，即把空間矢量平面的每個(gè)大扇區(qū)分割成兩個(gè)直角三角形區(qū)域，參考矢量根據(jù)最近矢量合成原則可由其所在直角三角形所對(duì)應(yīng)的基本矢量來合成，SVPWM簡(jiǎn)化算法不僅使計(jì)算量大大減少并巧妙的省去了對(duì)NPC三電平逆變器中點(diǎn)電壓的控制，降低了控制算法的整體難度。 針對(duì)傳統(tǒng)鎖相環(huán)在電壓畸變條件下不能獲得準(zhǔn)確相位的問題，提出了一種基于dq坐標(biāo)變換原理三相鎖相環(huán)。在三相電壓不平衡時(shí)，利用T/4(T為三相電壓周期)延時(shí)計(jì)算法實(shí)現(xiàn)正、負(fù)序分量分離，有效地抑制負(fù)序分量對(duì)相位的影響，通過仿真和實(shí)驗(yàn)結(jié)果表明，該鎖相環(huán)的動(dòng)態(tài)響應(yīng)速度快、穩(wěn)態(tài)性能好，并對(duì)電壓畸變有很強(qiáng)的抑制作用。 設(shè)計(jì)基于SVPWM簡(jiǎn)化算法的NPC三電平逆變器并網(wǎng)控制策略，并對(duì)其進(jìn)行MATLAB仿真，仿真結(jié)果表明，在此控制策略下，得到很好的并網(wǎng)電流波形，電流諧波含量小于1%。 以DSP2808和CPLD為控制核心建立了10KW NPC三電平光伏并網(wǎng)逆變器的試驗(yàn)平臺(tái)，并在此平臺(tái)上驗(yàn)證基于SVPWM簡(jiǎn)化算法的并網(wǎng)控制策略，試驗(yàn)結(jié)果顯示該逆變器在額定輸出功率下，并網(wǎng)電流諧波小于3%，功率因數(shù)0.99以上，整機(jī)效率最大可達(dá)98%，具備完善的保護(hù)功能。
[Abstract]:Multilevel inverter has many advantages such as low voltage stress, low switching loss, low harmonic content and good quality of output waveform. It is widely used in the field of medium and high voltage and high power. Three-level inverter is the foundation of multilevel inverter. It is very important to analyze and study three-level inverter. Among the various control strategies of the three-level inverter, the space vector modulation (SVPWM) algorithm has the advantages of wide modulation range, high DC voltage utilization and easy implementation. Therefore, a grid-connected control strategy based on SVPWM is designed in this paper. The content of this paper can be divided into the following aspects. The research status of three-level inverter at home and abroad is analyzed. It can be seen that diode clamped three-level inverter is the earliest and most widely used one. Therefore, the diode clamped three-level inverter is chosen as the research object. The topological structure and working principle are analyzed in detail. In view of the disadvantages of traditional SVPWM, such as large amount of computation and low precision, this paper proposes a simplified SVPWM algorithm, which divides each large sector of the space vector plane into two right triangle regions. According to the principle of nearest vector synthesis, the reference vector can be synthesized by the basic vector corresponding to the right triangle in which the vector is located. The simplified algorithm not only reduces the computation but also saves the control of the neutral point voltage of NPC three-level inverter. The overall difficulty of the control algorithm is reduced. In order to solve the problem that traditional PLL can not get accurate phase under the condition of voltage distortion, a three-phase PLL based on DQ coordinate transformation principle is proposed. When the three-phase voltage is unbalanced, the method of T / 4T is used to calculate the delay of three-phase voltage. The separation of positive and negative sequence components is realized, and the influence of negative sequence component on phase is effectively suppressed. The results of simulation and experiment show that, The PLL has the advantages of fast dynamic response, good steady-state performance and strong suppression of voltage distortion. A grid-connected control strategy for NPC three-level inverter based on SVPWM simplified algorithm is designed and simulated by MATLAB. The simulation results show that under this control strategy, a good grid-connected current waveform is obtained, and the harmonic content of current is less than 1. A 10KW NPC three-level photovoltaic grid-connected inverter test platform is established with DSP2808 and CPLD as the control core, and the grid-connected control strategy based on SVPWM simplified algorithm is verified on this platform. The experimental results show that the inverter is of rated output power. The harmonics of the grid-connected current are less than 3, the power factor is more than 0.99, the maximum efficiency of the whole machine is up to 98, and it has perfect protection function.
【學(xué)位授予單位】：華南理工大學(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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