本文選題：光伏陣列 + 部分陰影遮擋��； 參考：《北京交通大學(xué)》2014年碩士論文

【摘要】：本文主要針對(duì)部分陰影遮擋條件下光伏發(fā)電系統(tǒng)的MPPT技術(shù)進(jìn)行研究,以光伏組件的輸出特性分析與研究為基礎(chǔ),通過搭建光伏陣列的模型,對(duì)部分陰影遮擋條件下光伏陣列的輸出特性進(jìn)行了理論研究與機(jī)理分析。為了從根本上解決由部分陰影遮擋所導(dǎo)致的陣列輸出功率大幅下降及多峰特性等問題,對(duì)比研究了集中式、組串式和組件式三種光伏發(fā)電系統(tǒng)的拓?fù)浣Y(jié)構(gòu)、MPPT控制策略及功率輸出特性,得出了組件式光伏發(fā)電系統(tǒng)MPPT具有明顯優(yōu)勢(shì)的結(jié)論。在組件式系統(tǒng)的MPPT技術(shù)方面,主要研究了雙向Buck-Boost變換器和Sepic變換器。在對(duì)這兩種拓?fù)涞男⌒盘?hào)模型分析的基礎(chǔ)上,分別進(jìn)行了電壓電流雙閉環(huán)的MPPT控制環(huán)路設(shè)計(jì),提出了一種改進(jìn)型滯環(huán)比較MPPT算法；針對(duì)雙向Buck-Boost變換器,還提出了一種雙載波的調(diào)制控制方法。利用Matlab及Psim搭建系統(tǒng)的模型,實(shí)現(xiàn)了任意外界條件下光伏陣列的最大功率輸出,驗(yàn)證了雙閉環(huán)MPPT控制策略及改進(jìn)型滯環(huán)比較MPPT算法的有效性；最后在器件參數(shù)選擇、調(diào)制方法、控制復(fù)雜程度及工作效率等方面對(duì)這兩種組件式拓?fù)溥M(jìn)行了對(duì)比分析。本文的主要?jiǎng)?chuàng)新點(diǎn)包含以下幾點(diǎn)： ①基于對(duì)數(shù)學(xué)模型及簡(jiǎn)化模型的對(duì)比分析,提出了一種精確工程模型,它以數(shù)學(xué)模型為基準(zhǔn),對(duì)簡(jiǎn)化模型的補(bǔ)償參數(shù)進(jìn)行擬合修正,同時(shí)兼顧了精確度與復(fù)雜程度； ②提出了一種改進(jìn)型滯環(huán)比較MPPT算法,不僅能有效解決振蕩和誤判問題,同時(shí)還能兼顧速度與精度,達(dá)到高效、準(zhǔn)確實(shí)現(xiàn)最大功率點(diǎn)追蹤的目的； ③提出了一種雙載波的雙向Buck-Boost變換器調(diào)制方法,能自適應(yīng)地實(shí)現(xiàn)工作模式的切換,保證了任意外界條件下組件的最大功率輸出； ④針對(duì)組件式MPPT的控制,提出了一種電壓電流雙閉環(huán)的控制策略,實(shí)現(xiàn)了狀態(tài)變量的解耦控制,具有較好的魯棒性、快速響應(yīng)特性及較高的可靠性。
[Abstract]:In this paper, the MPPT technology of photovoltaic power generation system under partial shadow occlusion is studied. Based on the analysis and research of the output characteristics of photovoltaic module, the model of photovoltaic array is built. The output characteristics of photovoltaic arrays under partial shadow occlusion are studied theoretically and the mechanism is analyzed. In order to solve the problems of decreasing output power and multi-peak characteristics caused by partial shadow occlusion, the centralized method is compared and studied. The topology structure and power output characteristics of three kinds of PV power generation systems are discussed. It is concluded that MPPT has obvious advantages. In the MPPT technology of component system, the bidirectional Buck-Boost converter and Sepic converter are studied. Based on the analysis of the small signal model of these two topologies, the MPPT control loop with double closed loops of voltage and current is designed, and an improved hysteresis comparison MPPT algorithm is proposed. A dual carrier modulation control method is also proposed. Using Matlab and Psim to build the system model, the maximum power output of photovoltaic array under arbitrary external conditions is realized, and the effectiveness of double closed loop MPPT control strategy and improved hysteretic comparison MPPT algorithm is verified. The control complexity and working efficiency of these two component topologies are compared and analyzed. The main innovations of this article include the following: 1. Based on the comparative analysis of mathematical model and simplified model, an accurate engineering model is proposed, which is based on mathematical model and modifies the compensation parameters of simplified model, taking into account the accuracy and complexity. (2) an improved hysteretic loop comparison (MPPT) algorithm is proposed, which not only can effectively solve the problem of oscillation and misjudgment, but also can give consideration to speed and accuracy, and achieve the purpose of high efficiency and accurate maximum power point tracing. (3) A dual-carrier bi-directional Buck-Boost converter modulation method is proposed, which can adaptively realize the switching of the working mode and ensure the maximum power output of the module under arbitrary external conditions. 4 aiming at the control of component MPPT, a voltage and current double closed loop control strategy is proposed. The decoupling control of state variables is realized, which has good robustness, fast response and high reliability.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM615

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