基于多电平逆变器的光伏系统模糊逻辑控制仿真研究

发布时间：2021-06-12 22:41

　　控制太阳能,可靠性和稳定性是两个主要挑战。此外,总谐波失真（THD）必须在最佳操作范围内。在逆变器中,直流转换为交流过程中会伴随谐波产生,这将影响电力电子设备的性能。因此,为了克服高压和高功率系统中的这种挑战,对多级逆变器（MLI）的拓扑研究具有重要的意义。这种类型的逆变器使用各直流电压电平在其输出端产生阶梯式交流电压,接近正弦曲线形状。基于级联H桥、电容钳位和二极管钳位逆变器,提出了一种多电平逆变器的拓扑结构。该拓扑结构在光伏模糊逻辑控制系统中具有更广泛适应性。本文特别关注光伏发电作为系统电源的仿真,并展示了单相11级H桥型逆变器（CHB）的潜力。为了切换IGBT器件,应用正弦脉冲宽度调制（SPWM）。此外,建立了模糊逻辑控制（FLC）模型,有效改善了电能质量。应用模糊逻辑控制模型寻找适当的开关信号降低了总谐波失真。为了显示11级H桥型逆变器的操作改进和减少复杂的声信号效应,所提出的系统采用Matlab/Simulink软件设计。最后,结果表明模糊逻辑控制的动态行为比传统的比例积分微分（PID）控制器好得多。 

【文章来源】：华北电力大学(北京)北京市 211工程院校 教育部直属院校

【文章页数】：53 页

【学位级别】：硕士

【文章目录】：
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



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