發(fā)布時間：2018-07-06 17:02

  本文選題：光伏發(fā)電 + 三電平并網(wǎng)逆變器��； 參考：《重慶理工大學》2017年碩士論文

【摘要】：近年來,光伏發(fā)電技術(shù)因其效率高、能源獲取可再生以及對環(huán)境零污染等優(yōu)點得到了國內(nèi)外廣泛的關(guān)注并加以研究與應用。其中,并網(wǎng)逆變器作為光伏發(fā)電技術(shù)中的核心環(huán)節(jié),其性能的好壞直接影響著光伏發(fā)電系統(tǒng)的可靠性和并網(wǎng)電流的質(zhì)量,從而影響著光伏發(fā)電技術(shù)的發(fā)展和推廣,故對并網(wǎng)逆變器的深入研究有著重要意義。本論文主要工作為:本文以LCL型二極管箝位型(NPC)三電平并網(wǎng)逆變器作為研究對象,對NPC三電平逆變器的工作原理進行分析,給出了其SVPWM的調(diào)制算法。同時,針對NPC三電平固有的中點平衡問題進行了分析并給出了中點平衡控制策略。針對LCL型NPC三電平并網(wǎng)逆變器,在ABC三相靜止坐標系、αβ兩相靜止坐標系和dq兩相旋轉(zhuǎn)坐標系下的數(shù)學模型。針對dq坐標系中出現(xiàn)的LCL參數(shù)耦合的問題,通過框圖等效的方式,推導出了一種將LCL參數(shù)完全解耦的前饋解耦方案。本文根據(jù)NPC三電平逆變器的工作方式以及我國光伏并網(wǎng)標準的規(guī)定,探索出了一種適用于三電平并網(wǎng)逆變器的LCL濾波器參數(shù)選取規(guī)則。通過對NPC三電平輸出紋波的分析和LCL濾波器中個參數(shù)對并網(wǎng)逆變器輸出電流諧波的影響,采用三維圖形分析的方式確定出LCL濾波器參數(shù)。本文對LCL濾波器固有特性(諧振問題)對并網(wǎng)逆變器系統(tǒng)產(chǎn)生不穩(wěn)定問題,分析了無源阻尼和有源阻尼的控制方式。在此基礎(chǔ)上,采用電容電流與并網(wǎng)電流雙閉環(huán)的控制策略控制LCL型NPC三電平并網(wǎng)逆變器。同時,對控制策略中外環(huán)PI調(diào)節(jié)器和內(nèi)環(huán)P調(diào)節(jié)器的參數(shù)給出了設(shè)計方法。在Matlab/Simulink中搭建系統(tǒng)仿真模型,對第3章選取的LCL濾波器參數(shù)和第4章中采用的并網(wǎng)控制策略進行仿真驗證。同時,采用TMS320F2812設(shè)計了一臺1.5kW的LCL型NPC三電平并網(wǎng)逆變器實驗樣機,本文主要對硬件系統(tǒng)中主電路、IPM驅(qū)動電路、電壓電流檢測調(diào)理電路和下位機系統(tǒng)等方面進行了設(shè)計,并對軟件系統(tǒng)中三電平SVPWM生成、AD采樣、控制算法環(huán)路和與下位機串口通信等部分進行了介紹。最后,根據(jù)仿真和實驗結(jié)果,說明了本文三電平逆變器SVPWM、LCL參數(shù)選擇方法、LCL解耦方法和電容電流與并網(wǎng)電流雙閉環(huán)并網(wǎng)控制策略的有效性和可行性。
[Abstract]:In recent years, photovoltaic power generation technology has been widely studied and applied at home and abroad because of its high efficiency, renewable energy and zero pollution to the environment. Among them, grid-connected inverter as the core link of photovoltaic generation technology, its performance directly affects the reliability of photovoltaic power system and the quality of grid-connected current, thus affects the development and promotion of photovoltaic power generation technology. Therefore, it is of great significance to study the grid-connected inverter in depth. The main work of this thesis is as follows: in this paper, the LCL diode clamped (NPC) three-level grid-connected inverter is taken as the research object. The principle of NPC three-level inverter is analyzed, and its SVPWM modulation algorithm is given. At the same time, the neutral-point balancing problem inherent in NPC three-level is analyzed and the neutral-point balance control strategy is given. Aiming at the LCL NPC three-level grid-connected inverter, the mathematical models in ABC three-phase stationary coordinate system, 偽 尾 two-phase stationary coordinate system and dq two-phase rotating coordinate system are presented. In order to solve the coupling problem of LCL parameters in dq coordinate system, a feedforward decoupling scheme is derived by using the block diagram equivalent method to decouple the LCL parameters completely. According to the operation mode of NPC three-level inverter and the regulation of our country's photovoltaic grid-connected standard, a rule of selecting LCL filter parameters suitable for three-level grid-connected inverter is explored in this paper. Based on the analysis of NPC three-level output ripple and the influence of one parameter in the LCL filter on the output current harmonics of grid-connected inverter, the parameters of the LCL filter are determined by three-dimensional graphic analysis. In this paper, the inherent characteristics (resonance problem) of LCL filter are analyzed for the instability of grid-connected inverter system, and the control methods of passive damping and active damping are analyzed. On this basis, the LCL NPC three-level grid-connected inverter is controlled by a double-closed loop control strategy of capacitive current and grid-connected current. At the same time, the design method of Pi regulator and P regulator is given. The system simulation model is built in Matlab / Simulink. The LCL filter parameters selected in Chapter 3 and the grid-connected control strategy adopted in Chapter 4 are simulated and verified. At the same time, a 1.5kW LCL NPC three-level grid-connected inverter experiment prototype is designed with TMS320F2812. This paper mainly designs the main circuit of the hardware system, such as IPM drive circuit, voltage and current detection conditioning circuit and lower computer system, etc. The three level SVPWM generation AD sampling, the control algorithm loop and the serial port communication with the lower computer in the software system are also introduced. Finally, according to the simulation and experimental results, the effectiveness and feasibility of the LCL decoupling method and the dual closed-loop grid-connected control strategy of capacitive current and grid-connected current for three-level inverter SVPWMN LCL are demonstrated.
【學位授予單位】：重慶理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TM464

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本文編號：2103506