控制太陽能,可靠性和穩(wěn)定性是兩個主要挑戰(zhàn)。此外,總諧波失真（THD）必須在最佳操作范圍內。在逆變器中,直流轉換為交流過程中會伴隨諧波產生,這將影響電力電子設備的性能。因此,為了克服高壓和高功率系統(tǒng)中的這種挑戰(zhàn),對多級逆變器（MLI）的拓撲研究具有重要的意義。這種類型的逆變器使用各直流電壓電平在其輸出端產生階梯式交流電壓,接近正弦曲線形狀�；诩壜�(lián)H橋、電容鉗位和二極管鉗位逆變器,提出了一種多電平逆變器的拓撲結構。該拓撲結構在光伏模糊邏輯控制系統(tǒng)中具有更廣泛適應性。本文特別關注光伏發(fā)電作為系統(tǒng)電源的仿真,并展示了單相11級H橋型逆變器（CHB）的潛力。為了切換IGBT器件,應用正弦脈沖寬度調制（SPWM）。此外,建立了模糊邏輯控制（FLC）模型,有效改善了電能質量。應用模糊邏輯控制模型尋找適當?shù)拈_關信號降低了總諧波失真。為了顯示11級H橋型逆變器的操作改進和減少復雜的聲信號效應,所提出的系統(tǒng)采用Matlab/Simulink軟件設計。最后,結果表明模糊邏輯控制的動態(tài)行為比傳統(tǒng)的比例積分微分（PID）控制器好得多。 

【文章來源】：華北電力大學(北京)北京市 211工程院校 教育部直屬院校

【文章頁數(shù)】：53 頁

【學位級別】：碩士

【文章目錄】：
摘要
ABSTRACT
CHAPTER ONE: INTRODUCTION AND BACKGROUND
    1.1 INTRODUCTION
    1.2 THE MAIN OBJECTIVES
    1.3 METHODOLOGY
    1.4 PROJECT LAYOUT
CHAPTER TWO: HISTORY AND LITERATURE REVIEW
    2.1 PHOTOVOLTAIC SYSTEMS
    2.2 PHOTOVOLTAIC ENERGY EQUIPMENT:
        2.2.1 Design of Photovoltaic (PV) System:
        2.2.2 Inverters
        2.2.3 Batteries
        2.2.4 Charge Controller and Balance of System Components (BOS)
    2.3 MULTI-LEVEL INVERTERS
        2.3.1 Introduction
        2.3.2 Inverter Topologies:
            2.3.2.1 Diode Clamped Inverter
            2.3.2.2 Capacitor Clamped Inverter
            2.3.2.3 Cascaded H-Bride Multi-Level Inverter (CHB-MLI)
                2.3.2.3.1 Operation and Development of CHB-MLI
    2.4 MODULATION STRATEGY OF MULTI-LEVEL INVERTERS
    2.5 FUZZY CONTROL
        2.5.1 Advantages of Fuzzy Controller vs proportional-integral-derivativecontrol(PID)
        2.5.2 Fuzzy Logic Controller(FLC)
    2.6 CONCLUSIONS
CHAPTER THREE:MATHEMATICAL MODELING AND DESIGN OFCHB-MLI AND FLC FOR PV SYSTEM
    3.1 BLOCK DIAGRAM OF PROPOSED SYSTEM
    3.2 PV ARRAY MODEL
        3.2.1 Mathematical Model
    3.3 MODELLING AND DESIGN CHB-MLI FOR PV APPLICATIONS
        3.3.1 Selective Harmonic Elimination(SHE)
        3.3.2 SPWM Method
    3.4 Fuzzy LOGIC CONTROLLER WITH CHB-MLI AND PV ARRAY
    3.5 CONCLUSIONS
CHAPTER FOUR: SIMULATION RESULS AND DISCUSSIONS
    4.1 PV ARRAY
    4.2 CASCADED H-BRIDGE 11-LEVEL INVERTER WITH FLC
    4.3 CASCADED H-BRIDGE 11-LEVLL INVERTER WITH PID CONTROLLER
    4.4 CONCLUSIONS
CHAPTER FIVE: CONCLUSIONS AND RECOMMENDATIONS
    5.1 CONCLUSIONS
    5.2 RECOMMENDATIONS
REFERENCES
PAPERS AND OTHER RESULTS PUBLISHED DURING THE MASTER'SDEGREE
ACKNOWLEDGEMENT



本文編號：3226429