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研究生：	錢立展 Chien, Li-Jhan
論文名稱：	具高轉換比之新型三埠轉換器 A Novel Three-port Converter with High Voltage Gain
指導教授：	陳建富 Chen, Jiann-Fuh
學位類別：	碩士 Master
系所名稱：	電機資訊學院 - 電機工程學系 Department of Electrical Engineering
論文出版年：	2013
畢業學年度：	101
語文別：	英文
論文頁數：	106
中文關鍵詞：	三埠轉換器、高轉換比、雙向轉換器
外文關鍵詞：	three-port converter, high voltage gain, bidirectional converter
相關次數：	點閱：168 下載：0
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基於使用元件少及體積較小等優點，三埠轉換器在獨立型的再生能源供電系統應用中廣受歡迎。傳統上，非隔離型之三埠轉換器由於電路升壓比受到寄生元件的限制，並不適合用於高輸入輸出轉換比的應用；隔離型之三埠轉換器可藉由調整各埠變壓器的匝數比來達到較高的電壓轉換比，但此類型電路所需元件較多，且變壓器中的漏感會降低轉換效率。本論文提出一具有高轉換比之新型三埠轉換器，透過結合應用於高升壓電路中的升壓技巧，並將其整併於非隔離型之三埠轉換器之中，使本文所提出之轉換器用較小匝數比及適當的開關導通率讓兩個低壓輸入端達到升壓的功能，故本轉換器可以同時達到高轉換比及高效率。本文將詳細說明此轉換器的操作原理、穩態分析、邊界導通分析及轉換器的設計流程等。最後實作出一組具低輸入電壓PV埠，雙向低電壓電池埠及高電壓輸出埠之實驗電路，並搭配數位信號處理控制器(digital signal processor, DSP)來驗證本論文之理論分析。

Three-port converters are popular for stand-alone renewable system applications because of less components and smaller volume. Conventionally, non-isolated three-port converters are not suitable for high conversion ratio applications, because the voltage gain is limited by the parasitic elements of circuit. Isolated three-port converters can achieve high conversion ratio by adjusting the turns ratio of the transformer, but the component count is high and the leakage inductance of the transformer will reduce the efficiency of the circuit. In this thesis, a novel three-port converter with high conversion ratio is proposed. The converter combines techniques of high step-up converters with a non-isolated three-port converter; therefore, a higher conversion ratio can be achieved with a lower turns ratio and a reasonable duty ratio. Also, the converter can achieve a high conversion ratio and high efficiency simultaneously. Operating principles, steady-state analysis, and boundary analysis of the converter are presented and discussed. Finally, a prototype of the proposed converter with a low input voltage port for PV source, a bidirectional port for storage elements, and a high voltage port for output is implemented to verify the theoretical analysis. The power flow control of the converter is also built and tested with a digital signal processor (DSP).

TABLE OF CONTENTS

CHAPTER 1 INTRODUCTION	1
1.1 Motivation	1
1.2 Outline of this thesis	4
CHAPTER 2 REVIEW OF TECHNIQUES	5
2.1 Isolated three-port converters	7
2.1.1 Half-bridge three-port converters	7
2.1.2 Phase-shift full-bridge three-port converters	10
2.2 Non-isolated three-port converters	12
2.2.1 Double inductor technique for three-port converters	12
2.2.2 Single inductor technique for three-port converters	14
2.3 High step-up converters	17
2.3.1 Voltage-lift technique of step-up converters	17
2.3.2 Coupled-inductor technique of step-up converters	19
2.3.3 Mixed technique of step-up converters	20
2.4 Comparison and discussion	21
CHAPTER 3 NOVEL THREE-PORT CONVERTER WITH HIGH VOLTAGE GAIN	24
3.1 Topology derivation of the proposed converter	24
3.2 Single input to single output (SISO) mode	26
3.2.1 Operating principle of the proposed converter in SISO mode	27
3.2.2 Steady-state analysis of the proposed converter in SISO mode	37
3.2.3 Boundary condition mode (BCM) analysis	41
3.3 Double input to single output (DISO) mode	43
3.3.1 Operating principle of the proposed converter in DISO mode	43
3.3.2 Steady-state analysis of the proposed converter in DISO mode	48
3.4 Single input to double output (SIDO) mode	49
3.4.1 Operating principle of the proposed converter in SIDO mode	49
3.4.2 Steady-state analysis of the proposed converter in SIDO mode	55
CHAPTER 4 CONTROL METHOD OF THE PROPOSED CONVERTER	57
4.1 Algorithm for duty ratio	58
4.2 MPPT method for IVR	61
4.3 Closed-loop design for OVR	62
4.4 Closed-loop design for BVR	64
4.5 s-to-z conversion	66
CHAPTER 5 DESIGN AND EXPERIMENTAL RESULTS	68
5.1 Component parameters design	69
5.1.1 Inductor and coupled-inductor	69
5.1.2 Capacitors	71
5.1.3 Power devices	72
5.2 Experimental results	73
5.2.1 Experimental results in SISO mode, PV to load	74
5.2.2 Experimental results in SISO mode, battery to load	80
5.2.3 Experimental results in DISO mode	86
5.2.4 Experimental results in SIDO mode	89
5.3 Maximum power point tracking	93
5.4 Experimental results in SIDO mode with CV charging	96
5.5 Conversion efficiency	97
CHAPTER 6 CONCLUSIONS AND FUTURE WORKS	99
6.1 Conclusions	99
6.2 Future work	100
REFERENCE	101

 
LIST OF FIGURES

Fig. 1.1 Stand-alone renewable power systems with different architectures	2
Fig. 2.1 Operation modes for three-port converters	6
Fig. 2.2 Three-port half-bridge converter with primary freewheeling	7
Fig. 2.3 Three-port half-bridge converter with synchronous regulation	9
Fig. 2.4 Different primary circuits for half-bridge converters	10
Fig. 2.5 Boost integrated phase-shift full-bridge three-port converter	11
Fig. 2.6 A non-isolated converter with two inductors	13
Fig. 2.7 A boost-type three-port converter	15
Fig. 2.8 Different types of single inductor three-port converters	17
Fig. 2.9 Topologies of voltage-lift boost converters	18
Fig. 2.10 Three types of coupled-inductor converter	20
Fig. 2.11 Coupled-inductor converter with voltage-lift technique	21
Fig. 3.1 The proposed three-port converter	25
Fig. 3.2 Circuit configure of the proposed converter	26
Fig. 3.3 Typical waveforms of the proposed converter in SISO mode	29
Fig. 3.4 Current-flow paths of operating modes in SISO mode (PV to load)	31
Fig. 3.5 Typical waveforms of the proposed converter in SISO mode	34
Fig. 3.6 Current-flow paths of operating modes in SISO mode (battery to load)	36
Fig. 3.7 Voltage gain versus duty-ratio of the proposed converter	40
Fig. 3.8 Critical waveforms of the proposed converter at BCM operation	42
Fig. 3.9 Boundary condition of the proposed converter with n = 5	42
Fig. 3.10 Typical waveforms of the proposed converter in DISO mode	45
Fig. 3.11 Current-flow paths of operating modes in DISO mode	47
Fig. 3.12 Typical waveforms of the proposed converter in SIDO mode	52
Fig. 3.13 Current-flow paths of operating modes in SIDO mode	55
Fig. 4.1 Control diagram for the proposed converter	57
Fig. 4.2 Algorithm flow chart for the proposed converter	59
Fig. 4.3 PWM modulator for the proposed converter	60
Fig. 4.4 Algorithm flow chart of MPPT with P&O method	61
Fig. 4.5 Open-loop control-to-output Bode plot	63
Fig. 4.6 Closed-loop Bode plot with a compensator for output	63
Fig. 4.7 Open-loop control-to-battery Bode plot	65
Fig. 4.8 Closed-loop Bode plot with a compensator for battery port	65
Fig. 4.9 Flow chart of the voltage mode digital control	67
Fig. 5.1 The implementation circuits	68
Fig. 5.2 Measured waveforms under output power Po = 60 W	75
Fig. 5.3 Measured waveforms under output power Po = 120 W	77
Fig. 5.4 Measured waveforms under output power Po = 300 W	79
Fig. 5.5 Load variation between Po = 120 W and Po = 300 W in SISO mode	80
Fig. 5.6 Measured waveforms under output power Po = 60 W	82
Fig. 5.7 Measured waveforms under output power Po = 120 W	83
Fig. 5.8 Measured waveforms under output power Po = 300 W	85
Fig. 5.9 Load variation between Po = 120 W and Po = 300 W in SISO mode	86
Fig. 5.10 Measured waveforms in DISO mode with Po = 320 W	88
Fig. 5.11 Measured waveforms in SIDO mode with Po = 80 W	91
Fig. 5.12 Measured waveforms in SIDO mode with Po = 160 W	93
Fig. 5.13 P-V tracking curve in the SIDO mode with Po = 160 W	94
Fig. 5.14 Waveforms of PV port in SIDO mode	94
Fig. 5.15 P-V tracking curve in the DISO mode with Po = 320 W	95
Fig. 5.16 Waveforms of voltage, current, and power in DISO mode	95
Fig. 5.17 Load variation between Po = 120 W and Po = 300 W in SIDO mode	96
Fig. 5.18 Conversion efficiency in SISO mode	97
Fig. 5.19 Conversion efficiency under constant Ppv and various Po	98

 
LIST OF TABLES

Table 2.1 Component count and voltage gain of three-port converters	22
Table 2.2 Component count and voltage gain of high step-up converters	23
Table 5.1 Specification for the proposed converter	69
Table 5.2 Key parameters of ETD-59	69
Table 5.3 Specification for circuit components	73
Table 5.4 Specification for DelSolar/D6M250B3A	73
Table 5.5 Recorded powers of each port under constant Ppv and various Po	98

                                    

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校內：2018-07-23公開
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