Pulse density modulation controlled converter for PV systems

Öncü, Selim; Karafil, Akif

doi:10.1016/j.ijhydene.2017.05.163

Cited by 14 publications

(9 citation statements)

References 19 publications

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“…High frequency converters have advantages of low cost, small size, light weight, cheapest cost and neglects the oscillated waveforms of voltage and current [13], [14]. But they have difficulties of hard-switching, the large current and voltage stress, high EMI leads to more dv/dt and di/dt losses [15], [16]. Therefore, for improving the efficiency of the converter, it requires modulation technique, auxiliary transition circuit and resonance needs to enhance soft-switching.…”

Section: A High/low Frequency Convertersmentioning

confidence: 99%

Operation of Current-fed Dual Active Bridge DC-DC Converters for Microgrid

Geetha¹,

Subramaniam²,

Gnanadass³

2019

IJRTE

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Dual Active Bridge (DAB) is an isolated bidirectional DC-DC converter, which comprises two full bridge converters linked through a high frequency transformer. It has low stresses and permits high frequency performance because of the soft-switching. All the switches in the converter achieves the turn ON & OFF during Zero Voltage Switching (ZVS) and Zero Current Switching (ZCS) to minimize switching loss. Generally, DAB is classified as two types, namely, voltage-fed and current-fed variants. At light load conditions, soft-switching is not realized in case of voltage-fed DAB topologies. The application of current-fed DAB converters is to reduce the losses at the time of switching under light load conditions and improves the efficiency. This paper describes the various topologies of voltage-fed and current-fed DAB used for different applications in microgrid and fuel cell energy generation system by using the simulation. The performance of voltage-fed and current-fed DAB with snubber-less converters are also demonstrated and their effectiveness are validated.

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Section: A High/low Frequency Convertersmentioning

confidence: 99%

Operation of Current-fed Dual Active Bridge DC-DC Converters for Microgrid

Geetha¹,

Subramaniam²,

Gnanadass³

2019

IJRTE

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“…Amount of sub harmonics also decreases with the irregular PDM. However, this method requires complex and large logic circuits or memory elements to obtain gate signals of the power switches [19][20][21][22]. In the regular PDM, the control signals of the power switches can be obtained by simple logic circuits [23].…”

Section: Introductionmentioning

confidence: 99%

Comparison of Control Techniques for Series Resonant Converter

Nacar

Öncü

Bal

2021

Gazi Üniversitesi Fen Bilimleri Dergisi Part C: Tasarım Ve Teknoloji

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There are many different derivatives of variable and fixed frequency switching control techniques used in control of load resonant converters. In this study; among these techniques frequency modulation (FM), phase shift modulation (PSM) and pulse density modulation (PDM) are applied separately to series resonant converter (SRC). The techniques are examined and compared in many respects. An experimental setup is built, which consists of a 400W converter, a control circuit and a resistive load to verify theoretical studies. The converter is controlled by FM, PSM and PDM separately for 120 kHz basic operating frequency and different output currents. Experimental results are compared in terms of efficiency, output voltage ripple, soft switching, switch voltage, ease of application and hardware. The comparison results are presented. Thus, effect of each technique on the operating parameters of the converter is revealed. Moreover, it is also observed that FM has better performance than the other two techniques in many aspects.

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“…Çalışma frekansının düşük olması devrede kullanılan pasif elemanların boyutlarının hacimsel olarak büyümesine neden olur. Bu durumda devrenin boyutu ve ağırlığı ile birlikte devrenin maliyeti de artmaktadır [10][11][12]. Bu problemlerin çözümü için yumuşak anahtarlama tekniği kullanılabilir.…”

Section: Gi̇ri̇ş (Introduction)unclassified

Fotovoltaik (PV) entegrasyonlu rezonans dönüştürücü için çeşitli düzensiz darbe yoğunluk modülasyonu (PDM) kontrol dağılımı uzunluklarının karşılaştırılması

Karafil

2021

Gazi Üniversitesi Mühendislik Mimarlık Fakültesi Dergisi

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 Analysis of various irregular PDM control pattern lengths  Power control by providing MPPT at different solar irradiation  Achievement of ZCS at all power outputs of PV system using PLL techniqueThe power control was provided by deleting control signals without changing the switching frequency according to the power values of PV panels in different solar irradiation conditions. Firstly, current and voltage of the PV panel are measured. The measured current and voltage values are compared with the previous one. Then, instantaneous current (In) and voltage (Vn) values are obtained and it is checked whether voltage change (dV) is zero or not. If dV is equal to zero and the current change (dI) is positive (dI>0), pulse density (PD) is increased. If dV is equal to zero but dI is negative (dI<0), PD is decreased. If dV is not equal to zero and dI/dV is larger than -I/V (dI/dV>-I/V), PD is increased. If dI/dV is smaller than -I/V (dI/dV<-I/V), PD is decreased. Figure A. Block scheme of PDM controlled IC MPPT algorithm systemPurpose: In this study, the maximum power obtained from photovoltaic (PV) panels was transferred the load using the proposed 8, 16 and 32 irregular pulse density modulation (PDM) pattern controlled series resonant converter. In the study, changes in the system occurred due the variations in PDM pattern lengths were analyzed. Theory and Methods:The control of the series resonant converter that transfers the energy of the PV panels to the load in the system was provided with a new method, PDM controlled IC MPPT. In this paper, various irregular PDM control pattern lengths were compared and the simulation results were given. Results:According to the results of the analysis, it was found that the changes in PDM pattern lengths changed MPPT efficiency slightly. While increasing the PDM pattern length increased the software complexity of the system, it increased the number of elements to be used in the PDM circuit, thus increasing the cost, circuit size and weight of the system. However, as the PDM pattern length increased, the control sensitivity was higher as a narrower ranges power control was achieved. Conclusion:In this paper, the effect of PDM controlled IC MPPT algorithm, which is a novel method, on series resonant converter was investigated. Advantages and disadvantages of 8, 16 and 32 irregular PDM pattern lengths were analyzed. The MPPT efficiency was found to be over 99%. In addition, ZCS conditions were provided in all rapidly changing solar irradiation values. This indicates that the switching losses in the converter are minimized.

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Pulse density modulation controlled converter for PV systems

Cited by 14 publications

References 19 publications

Operation of Current-fed Dual Active Bridge DC-DC Converters for Microgrid

Operation of Current-fed Dual Active Bridge DC-DC Converters for Microgrid

Comparison of Control Techniques for Series Resonant Converter

Fotovoltaik (PV) entegrasyonlu rezonans dönüştürücü için çeşitli düzensiz darbe yoğunluk modülasyonu (PDM) kontrol dağılımı uzunluklarının karşılaştırılması

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