【摘要】：隨著能源危機(jī)和環(huán)境問題的日益加劇,太陽(yáng)能以其獨(dú)特的優(yōu)勢(shì)越來(lái)越受到人們的青睞。作為新能源發(fā)電的核心技術(shù),并網(wǎng)逆變技術(shù)也備受關(guān)注,積極進(jìn)行光伏并網(wǎng)逆變器的研究和開發(fā),將光伏電池陣列發(fā)出的直流電逆變成可以并入國(guó)家電網(wǎng)的高質(zhì)量電能送入千家萬(wàn)戶,才能真正的解決能源危機(jī)問題。本文的主要工作如下： 研究了光伏并網(wǎng)逆變器拓?fù)浣Y(jié)構(gòu),明確其控制目標(biāo),分析了不同單相光伏并網(wǎng)逆變器拓?fù)潆娐泛统Ｓ貌⒕W(wǎng)逆變器控制技術(shù)的優(yōu)缺點(diǎn)。針對(duì)單相非隔離型光伏并網(wǎng)逆變器,分析其工作原理和SPWM調(diào)制技術(shù),完成了boost電路參數(shù)的設(shè)計(jì),進(jìn)而對(duì)比分析L、LC、LCL三種濾波器的濾波性能,選擇具有諧波抑制作用的LCL型濾波器并依據(jù)其約束條件完成對(duì)其參數(shù)的設(shè)計(jì)。 在DC-AC環(huán)節(jié),針對(duì)LCL型單相光伏并網(wǎng)逆變器易發(fā)生諧振的問題,提出采用以并網(wǎng)電流為外環(huán)控制量、電容電流為內(nèi)環(huán)控制量,附加輸出電壓跟蹤調(diào)整功能的雙電流環(huán)控制的控制策略,設(shè)計(jì)了雙電流環(huán)控制參數(shù)并通過(guò)SISOTOOL工具對(duì)其進(jìn)行整定,同時(shí)分析了坐標(biāo)變換的同步鎖相環(huán)控制技術(shù),設(shè)計(jì)了基于同步旋轉(zhuǎn)坐標(biāo)變換的鎖相環(huán)的控制參數(shù)。 最后,基于MATLAB/SIMULINK軟件平臺(tái)搭建了基于電流雙環(huán)控制的LCL單相并網(wǎng)逆變器的仿真模型,仿真結(jié)果表明,LCL型單相并網(wǎng)逆變器系統(tǒng)在采用雙電流環(huán)控制的控制策略可有效抑制系統(tǒng)振蕩,降低并網(wǎng)電流諧波含量和提高系統(tǒng)穩(wěn)定性。保證逆變器輸出電流為正弦波,輸出電壓與電網(wǎng)電壓同頻、同相,使單相并網(wǎng)逆變器工作在較高功率因數(shù)并網(wǎng),驗(yàn)證了所設(shè)計(jì)的控制策略的可行性。
[Abstract]:With the increasing energy crisis and environmental problems, solar energy is becoming more and more popular for its unique advantages. As the core technology of new energy generation, grid-connected inverter technology is also paid close attention to, and the research and development of photovoltaic grid-connected inverter are actively carried out. In order to solve the problem of energy crisis, the direct current produced by photovoltaic cell array can be transformed into high quality electric energy that can be incorporated into the state grid and sent to thousands of households. The main work of this paper is as follows: the topology structure of photovoltaic grid-connected inverter is studied and its control target is defined. The advantages and disadvantages of different single-phase photovoltaic grid-connected inverter topology circuits and common grid-connected inverter control techniques are analyzed. Aiming at single-phase non-isolated photovoltaic grid-connected inverter, this paper analyzes its working principle and SPWM modulation technology, completes the design of boost circuit parameters, and then compares and analyzes the filtering performance of three kinds of filters. The LCL filter with harmonic suppression is selected and its parameters are designed according to its constraints. In DC-AC, aiming at the problem that LCL single-phase photovoltaic grid-connected inverter is easy to resonate, it is proposed to use grid-connected current as outer loop control quantity and capacitive current as inner loop control quantity. The control strategy of double current loop control with additional output voltage tracking and adjusting function is introduced. The control parameters of double current loop are designed and adjusted by SISOTOOL tool. At the same time, the synchronous phase-locked loop control technology based on coordinate transformation is analyzed. The control parameters of PLL based on synchronous rotation coordinate transformation are designed. Finally, based on MATLAB/SIMULINK software platform, the simulation model of LCL single-phase grid-connected inverter based on double-loop current control is built. The simulation results show that the control strategy of double-current loop control can effectively suppress the system oscillation in the single-phase grid-connected inverter system. Reduce the harmonic content of grid-connected current and improve the stability of the system. The output current of the inverter is sine wave, the output voltage is the same frequency as the grid voltage and the phase is the same. The single-phase grid-connected inverter is connected to the grid in a higher power factor. The feasibility of the proposed control strategy is verified.
【學(xué)位授予單位】：寧夏大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM464;TM615

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