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oe1(光电查) - 科学论文

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出版时间
  • 2018
研究主题
  • high voltage gain
  • switched-inductor (S-L) cell.
  • micro-inverter
  • DC-DC step-up converter
应用领域
  • Electrical Engineering and Automation
机构单位
  • Indian Institute of Technology Delhi
  • National Institute of Technology Tiruchirappalli
12 条数据
?? 中文（中国） ▾

  • Novel High Gain, High Efficiency DC–DC Converter Suitable for Solar PV Module Integration With Three-Phase Grid Tied Inverters

    摘要： This paper proposes a novel configuration for high gain, high efficiency dc–dc converter comprising a single switch, two intermediate capacitors, and a coupled inductor for low voltage solar PV module fed applications. The high voltage gain is achieved by charging the intermediate capacitors through the coupled inductor in parallel and discharging in series. In a two winding coupled inductor, considered in the presented work, maximum two intermediate capacitors can be integrated with the secondary winding. A passive lossless clamped circuit is also provided in the converter, which recovers the leakage energy to improve the efficiency and alleviate large voltage spike. The structure of the circuit is such that the power device voltage stress is reduced thereby increasing the efficiency. The maximum power point tracking at various irradiation levels is implemented in the proposed converter. Laboratory prototype of a 300-W system with 30–45-V input and 700-V output was built to validate the theoretical claims. All the detailed analysis, simulation, and experimental waveforms are presented. A maximum converter efficiency of around 95% is achieved.

    关键词： maximum power point tracking (MPPT),switched capacitor,solar PV,coupled inductor,dc micro-grid,step-up,high efficiency,3-φ inverter,low voltage,high gain,dc–dc converters

    更新于2025-09-23 15:22:29

  • [IEEE 2018 IEEE Energy Conversion Congress and Exposition (ECCE) - Portland, OR, USA (2018.9.23-2018.9.27)] 2018 IEEE Energy Conversion Congress and Exposition (ECCE) - Common Mode Noise Analysis for a High Step-Up Converter with GaN Devices

    摘要： High Step-up converters have numerous applications in renewable energy systems and electric automotive industry. To improve the power density, an interleaved high step-up boost converter with coupled inductor was proposed. However, for practical applications is compulsory that this topology must comply with the CISPR standards. Therefore, to identify the noise sources in the analyzed converter, an equivalent noise modelling is conducted. These models revealed the dependency of inductor windings on different noise sources. For experimental analysis of the conducted emissions of this topology, GaN FETs based prototype is designed. Several tests were carried out to find the effect of various factors on noise emission. As results of tests, 1) Increasing the switching frequency generates increase in the noise spikes 2) Noise emissions from the converter do depend on its mode of operation 3) High peaks of noise are generated at low frequency range by reducing the voltage transition time across the switch.

    关键词： Coupled-Inductor,High Step-Up,GaN FETs,CM Noise,DC-DC Converter,EMI Noise

    更新于2025-09-23 15:22:29

  • [IEEE 2018 37th Chinese Control Conference (CCC) - Wuhan (2018.7.25-2018.7.27)] 2018 37th Chinese Control Conference (CCC) - A Novel Family of Integrated Step-Up PV Micro-Inverter

    摘要： A family of integrated set-up micro-inverter was proposed for the application of photovoltaic power generation system. The proposed inverters have the advantages of less power devices, simpler topology and higher integration and they can achieve voltage pump and invert at the same time. These topologies are suitable for the photovoltaic AC module which has low input voltage, small size and high integration. According to the existing integrated inverters, constructing the switch-diode (SD) unit through the traditional boost or buck-boost DC/DC converters, then proposing the switch-switch (SS) unit with bi-directional flow of the energy. At last, a family of integrated sep-up micro-inverter was derived by combining the SS unit. One of the proposed topologies was given as an example and verified by simulation prototype, which indicates that the topology can achieve the functions of voltage pump and inverting.

    关键词： integrated micro-inverter,single-stage,switch unit,step-up

    更新于2025-09-23 15:21:21

  • [IEEE 2020 IEEE International Conference on Power Electronics, Smart Grid and Renewable Energy (PESGRE) - Cochin, India (2020.1.2-2020.1.4)] 2020 IEEE International Conference on Power Electronics, Smart Grid and Renewable Energy (PESGRE2020) - A New Step-Up Transformerless Inverter Topology for 1-é? Grid-connected Solar Photovoltaic System

    摘要： In this paper, a step-up transformerless inverter topology is investigated for the grid-connected solar PV system. This proposed topology combines the features of the DC-DC step-up converter and two-level inverter. The important features of this topology are: First, the proposed topology keeps the negative terminal of the PV source directly connected with the neutral of the grid. Therefore, there is no variation in the CMV, which appears across the PV parasitic capacitance, resulting in negligible leakage current and higher efficiency. Negligible leakage current makes this topology highly suitable for transformerless grid-connected solar PV application; second, due to the step-up feature of the proposed topology, the inverter output voltage can be greater than the input DC voltage of solar PV which makes the proposed topology suitable for connecting lower voltage solar PV modules. The topology works with a simple and dedicated PWM scheme, which consists of certain logic operations as explained in the text. The modes of operation, design of the converter, PWM strategy, and analysis are presented in detail. The MATLAB/Simulink environment is used to simulate the proposed grid-connected system for 300W power rating and all the results are included in the paper, which shows that the proposed system gives higher efficiency with lower THD in grid-current.

    关键词： PV fed system,Leakage current,Two-level inverter,step-up transformer-less inverter,DC-DC converter

    更新于2025-09-23 15:21:01

  • [IEEE 2020 11th Power Electronics, Drive Systems, and Technologies Conference (PEDSTC) - Tehran, Iran (2020.2.4-2020.2.6)] 2020 11th Power Electronics, Drive Systems, and Technologies Conference (PEDSTC) - A New Non-isolated High Gain DC-DC Converter for Grid-Connected Photovoltaic Systems

    摘要： a non-coupled high gain DC-DC converter is introduced in this article. It is based on ?uk converter, also consists of two inductors, which are charged in parallel by input source and discharged in series. The voltage gain of the proposed converter is improved, while it has no transformers and coupled inductors. Furthermore, the voltage stress across the switches is decreased. Hence, switches with lower voltage level can be used in the proposed converter. Fortunately, these switches have low ON-state resistance ((cid:1792)(cid:1804)(cid:1819).(cid:1815)(cid:1814) ), which causes decreasing in switch conduction losses. Furthermore, the proposed converter has high efficiency as well as simple control system. Finally, the principle operation and simulation results are presented.

    关键词： high step-up gain,high efficiency,?uk-based converter,low voltage stress,non-isolated inductor

    更新于2025-09-23 15:21:01

  • Sliding mode controllera??based ea??bike charging station for photovoltaic applications

    摘要： PV-based and wired type of the electrical bicycles (e-bike) battery charging stations widely is spreading because of the resonant network limitations and low efficiency of the wireless mode for these stations. The generated voltage of many of the PV panels such as JIYANGYIN HR-200 W-24 V at the maximum power point is around 36VDC. So, a step-down converter with a PID controller for Maximum Power Point Tracking (MPPT) of the PV panels is considered between PV panels and boost converter in order to decrease this voltage and enhance the current values for the load side. A sliding mode controller (SMC) equipped with a non-isolated DC-DC boost converter with reduced voltage stresses on the power switch is presented. The step-up converter increases the voltage to the utility level of the e-bike with around 360 Wh amount of energy. The main concerns about the converters are the efficiency, voltage, and current stresses, number of active or passive components in the converter topology and simplicity. In comparison with a conventional step-up converter, the selected converter has a lower dynamic loss in the input inductor that can give a proper efficiency by considering its higher voltage gain. The average state-space model for the SMC is used and the main advantage of the controller is its independency to the inductor current or the amount of the load. The proposed SMC is compared with PID and Fuzzy Logic Controller (FLC) methods and based on the results, the robustness, overshoot, and damping factor of the controller are at an acceptable and better level. All mathematical, simulation and comparison results are presented. A 720 Wh circuit has been implemented for charging all types of the Li-Ion or Li-Polymer batteries with 36VDC and 10 Ah specifications.

    关键词： DC-DC step-up converter,electrical charging station (ECS),PV panels,sliding mode controller (SMC),E-bike

    更新于2025-09-19 17:13:59

  • Analysis of an LED lighting circuit using a hybrid bucka??boost converter with high gain

    摘要： In this paper, a hybrid buck–boost dc–dc converter and its analysis method are presented for LED lighting applications. Unlike existing LED driver circuits, the proposed driver circuit has a hybrid structure which consists of a buck–boost converter and a switched-capacitor (SC) step-up converter with flying capacitors. The features of the proposed driver are as follows: 1. High voltage gain provided by cascading two dc–dc converters, 2. Flexible LED current control using step-up/step-down conversion, and 3. Small volume offered by a single inductor structure. Concerning the proposed driver circuit, a simple equivalent circuit is derived by theoretical analysis. Furthermore, the characteristics of the proposed converter are revealed by simulation program with integrated circuit emphasis (SPICE) simulations and breadboard experiments. The results of simulation and experiment demonstrate the feasibility of the proposed driver circuit. The proposed driver circuit can achieve about 89% efficiency and ?10 V output when the output load is 400 mW.

    关键词： Hybrid DC–DC converters,LED lighting applications,Buck–boost converters,Step-up converters,Switched-capacitor techniques

    更新于2025-09-19 17:13:59

  • [IEEE 2018 15th IEEE India Council International Conference (INDICON) - Coimbatore, India (2018.12.16-2018.12.18)] 2018 15th IEEE India Council International Conference (INDICON) - Switched-Inductor Based High Voltage Gain Step-up DC-DC Converter for Photovoltaic Micro-Inverter Application

    摘要： Traditional boost converter cannot offer a high voltage gain due to the conduction losses in the ESR of capacitor and DCR of inductor, at higher duty cycles. Therefore, traditional boost converter cannot be employed for voltage conversion in occasions that need very high voltage boosting such as the grid-connected photovoltaic micro- inverter. In this paper, a high voltage gain step-up converter, utilizing a switched-inductor (S-L) cell, is proposed. The input current of the suggested converter is continuous because of the presence inductor at source side that makes the input filter design easier. This converter produces very high output voltage at a lower duty cycle, which makes it suitable for photovoltaic micro-inverter application. The basic operation principles and steady-state analyses of the proposed step-up converter are discussed to derive the voltage gain and voltage/current stresses across each component. The proposed boost converter is finally simulated in MATLAB/Simulink to verify all theoretical analyses.

    关键词： high voltage gain,switched-inductor (S-L) cell.,micro-inverter,DC-DC step-up converter

    更新于2025-09-19 17:13:59

  • Integrated step-up non-isolated inverter with leakage current elimination for grid-tied photovoltaic system

    摘要： This study presents a non-isolated step-up inverter without leakage current for low-voltage renewable energy generation such as photovoltaic (PV) cells grid connection. From the structure of the proposed inverter, the negative terminal of the PV array is directly linked with the grid neutral, so the common mode voltage of the parasitic capacitance can be kept constant and the leakage current will not be generated in theory. Moreover, this transformerless inverter can produce an AC output voltage higher than the input DC voltage, which will reduce the sizes of the generation system. A switching modulation strategy carrier-based is analysed in detail when the input inductor current is operated in discontinuous conduction mode. The operation modes of the proposed inverter are also discussed, respectively, in positive and negative half line cycles. Finally, a digital experimental prototype is tested in the laboratory, and the experimental results are consistent with the theoretical analysis.

    关键词： leakage current elimination,non-isolated inverter,transformerless inverter,step-up inverter,grid-tied photovoltaic system

    更新于2025-09-16 10:30:52

  • Fixed- and variable-frequency sliding mode controller–maximum power point tracking converter for two-stage grid-integrated photovoltaic system employing nonlinear loads with power quality improvement features

    摘要： This article presents a reliable and efficient photovoltaic sliding mode voltage-controlled maximum power point tracking DC-DC converter–active power filter integration system to supply real power to grid. This integrated active power filter system performs power quality enhancement features to compensate current harmonics to make distortion-free grid supply current and reactive power employing nonlinear loads. The proposed proportional–integral–derivative–based sliding mode controller is designed with fixed-frequency pulse-width modulation based on equivalent control approach. The main objective of this paper is to design a photovoltaic system with a new sliding surface to force the photovoltaic voltage to follow the reference maximum power point voltage with the alleviation of slow transient response and disadvantages of chattering effects of variable-frequency hysteresis modulation sliding mode controller–maximum power point tracking. The perturbations caused by the uncertainties in climatic conditions and converter output bulk oscillations during grid integration are also mitigated. The features of the proposed photovoltaic–active power filter integration system are confirmed at different operating conditions through PSIM simulation software, and its performance is also compared with a conventional variable-frequency sliding mode-controlled maximum power point tracking. The obtained simulation and experimental results give good dynamic response under various operating conditions of environmental and local load conditions.

    关键词： sliding mode controller,pulse-width modulation,photovoltaic,power quality,active power filter,Maximum power point tracking,high step-up DC-DC converter

    更新于2025-09-12 10:27:22