A High Step-Up Converter With a Voltage Multiplier Module for a Photovoltaic System

Tseng, Kuo‐Ching; Huang, Chuan-Kuei; Shih, Wei-Yuan

doi:10.1109/tpel.2012.2217157

Cited by 242 publications

(162 citation statements)

References 35 publications

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“…Many step-up DC-DC converters with a charge pump coupled-by the magnetic devices outputs have been used in PV systems [16][17][18][19][20][21][22][23]. However, for the application of a converter to a MLI, a gain-matching constraint between the boost and the charge-pump should be satisfied.…”

Section: A Boost Converter With An Isolated Charge-pumpmentioning

confidence: 99%

A New Photovoltaic System Architecture of Module-Integrated Converter with a Single-sourced Asymmetric Multilevel Inverter Using a Cost-effective Single-ended Pre-regulator

Manoharan¹,

Ahmed²,

Park³

2017

Journal of Power Electronics

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In this paper, a new architecture for a cost-effective power conditioning systems (PCS) using a single-sourced asymmetric cascaded H-bridge multilevel inverter (MLI) for photovoltaic (PV) applications is proposed. The asymmetric MLI topology has a reduced number of parts compared to the symmetrical type for the same number of voltage level. However, the modulation index threshold related to the drop in the number of levels of the inverter output is higher than that of the symmetrical MLI. This problem results in a modulation index limitation which is relatively higher than that of the symmetrical MLI. Hence, an extra voltage pre-regulator becomes a necessary component in the PCS under a wide operating bias variation. In addition to pre-stage voltage regulation for the constant MLI dc-links, another auxiliary pre-regulator should provide isolation and voltage balance among the multiple H-bridge cells in the asymmetrical MLI as well as the symmetrical ones. The proposed PCS uses a singleended DC-DC converter topology with a coupled inductor and charge-pump circuit to satisfy all of the aforementioned requirements. Since the proposed integrated-type voltage pre-regulator circuit uses only a single MOSFET switch and a single magnetic component, the size and cost of the PCS is an optimal trade-off. In addition, the voltage balance between the separate H-bridge cells is automatically maintained by the number of turns in the coupled inductor transformer regardless of the duty cycle, which eliminates the need for an extra voltage regulator for the auxiliary H-bridge in MLIs. The voltage balance is also maintained under the discontinuous conduction mode (DCM). Thus, the PCS is also operational during light load conditions. The proposed architecture can apply the module-integrated converter (MIC) concept to perform distributed MPPT. The proposed architecture is analyzed and verified for a 7-level asymmetric MLI, using simulation results and a hardware implementation.

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Section: A Boost Converter With An Isolated Charge-pumpmentioning

confidence: 99%

A New Photovoltaic System Architecture of Module-Integrated Converter with a Single-sourced Asymmetric Multilevel Inverter Using a Cost-effective Single-ended Pre-regulator

Manoharan¹,

Ahmed²,

Park³

2017

Journal of Power Electronics

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“…6a. In doing so, the voltage of C o1 is reduced, and the voltage stress of Q, D 1 and D o1 are reduced as well. To replenish energy for C o2 , the inductor L 1 in Fig.…”

Section: High Step-up Converter Adopting Auxiliary Capacitor and Coupmentioning

confidence: 99%

“…Thus the energy crisis is increasingly serious. Meanwhile, the excessive usage of the traditional fossil energy has polluted the environment and resulted in greenhouse effect on a global scale [1]. Therefore, it is becoming more and more important to optimize the energy consumption structure and to utilize clean and renewable energy.…”

Section: Introductionmentioning

confidence: 99%

Non-isolated high step-up DC–DC converter adopting auxiliary capacitor and coupled inductor

Ruan

2017

J. Mod. Power Syst. Clean Energy

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For grid-connected power system based on photovoltaic (PV) source and fuel cells, high step-up and high-efficiency DC-DC converters are needed, due to the bus voltage of the grid-connected inverter is much higher than the output voltage of PV and fuel cells. In this paper, a novel high step-up converter is proposed. An auxiliary capacitor is introduced into the boost converter, which serves as a voltage source. It is in series with the input voltage source with the same voltage polarities. Thus, the input voltage is increased equivalently and the voltage gain is increased accordingly. To reduce the voltage stresses of the switch and the diode, multiple output capacitors are introduced. The voltage of each output capacitor is degraded leading to the reduced voltage stress. To replenish energy for the multiple output capacitors, a coupled inductor is adopted. Based on this, high step-up converter adopting auxiliary capacitor and coupled inductor is derived. The operating principles and voltage gain of the proposed converters are analyzed in this paper. In the end, experiment results are given to verify the theoretical analysis.

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“…The boost converter on combining with voltage multiplier to get high gain output at the load. This topology reduces the conduction losses, improves the efficiency and gain of the converter for connecting it to an inverter for connecting ac loads [1]. The switching frequency is given for 40kHz and provided with a load of 200Ω.…”

Section: Boost Converter Integration With Voltage Multipliermentioning

confidence: 99%

High Boost Converter and Hybrid Cascaded H Bridge Inverter for Photovoltaic System

R.Prakash¹

2014

IJAREEIE

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:The utilization of photovoltaic energy becomes an key source of electrical energy with the advancement in power electronic technology. The dc-dc converters is connected to PV system, for connecting the source to the grid or AC load through an inverter. MPPT (Maximum Power Point Tracking) increases the power production of the PV system. The advantages of high step up converters integration with voltage multiplier includes improving voltage gain without using extreme duty ratio, reduction of voltage stress, current ripple and conduction losses are desirable for renewable energy applications. A multilevel hybrid cascaded inverter is connected high step up converter for connecting to the ac load. KEYWORDS:High step up converter, voltage multiplier, renewable energy, photovoltaic system, high gain. I.INTRODUCTIONWith the development in power electronics technologies the renewable energy sources utilization become an increasing trend for electrical energy. The photovoltaic system is a feasible energy source in research and development work in power system and power electronics. High performance dc to dc converter can be obtained with MPPT technique and islanding detection for photovoltaic system are now considered for the interface to the grid or ac utilities [4]. The DC/AC inverters control the output voltage of DC/DC converter and generate a fundamental real power required for the loads.A voltage multiplier is a device which converts the low voltage input to a higher voltage by means of capacitors and diodes combined circuit. The voltage multiplier helps in reducing the turns ratio of transformer for better performance. The high step-up converter helps in improving the voltage gain, reduction of voltage stress and current ripple with optimized circuit performance. The integration of voltage multiplier reduces the input current ripple, hence the increases the life of PV arrays of the photovoltaic system. The output from PV, 30-40V is stepped to 300-400V by using dc-dc converters. The main factor depends on the selection of the PV array or cells in the photovoltaic system are the cost and efficiency. A novel cascaded hybrid inverter is connected to the output of the high boost converter for connecting ac loads in a photovoltaic system are discussed in this paper as shown in fig 1. II. MODELLING OF PHOTOVOLTAIC CELLThe solar radiations from the sun are converted to electric energy by the photovoltaic effect. The photons from the sun having band gap energy higher than the semiconductor material used, will produce electron-hole recombination, which depends on incident radiation. Electron-hole recombination result in the flow of photocurrent [5].The PV system depends on the cell temperature and solar insolation have non-linear characteristics for P-V and I-V curves. The

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A High Step-Up Converter With a Voltage Multiplier Module for a Photovoltaic System

Cited by 242 publications

References 35 publications

A New Photovoltaic System Architecture of Module-Integrated Converter with a Single-sourced Asymmetric Multilevel Inverter Using a Cost-effective Single-ended Pre-regulator

A New Photovoltaic System Architecture of Module-Integrated Converter with a Single-sourced Asymmetric Multilevel Inverter Using a Cost-effective Single-ended Pre-regulator

Non-isolated high step-up DC–DC converter adopting auxiliary capacitor and coupled inductor

High Boost Converter and Hybrid Cascaded H Bridge Inverter for Photovoltaic System

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