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[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
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[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
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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