A High Power Density Integrated Charger for Electric Vehicles with Active Ripple Compensation

Liwen, Pan; Zhang, Chengning

doi:10.1155/2015/918296

Cited by 12 publications

(8 citation statements)

References 24 publications

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“…The current loop has two main purposes: reduce the order of the system to simplify the controller design and reject fast current perturbations generated in the DC bus, for example, compensate changes in the power produced by the generator (e.g., sunlight increase/decrease in a PV system) or in the power requested by the load. The use of this structure is reported in the battery charger/discharger applications recently published in [36,37].…”

Section: Background Of the Proposed Solutionmentioning

confidence: 99%

“…The two poles of the transfer function G dc (s) can be designed in three different ways depending on the damping ratio ρ: complex-conjugate (ρ < 1), real and equal (ρ = 1), or real and different (ρ > 1). To study the dynamic behavior of the closed-loop system depending on the type of damping ratio, G dc (s) is rewritten as shown in (37), where ω n represents the natural frequency of the system. To exclusively analyze the effect of the damping ratio, the transfer function is normalized in terms of the natural frequency using the normalized Laplace variable s N = s ω n as in (38).…”

Section: Selection Of the Type Of Dynamic Responsementioning

confidence: 99%

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Control of a Charger/Discharger DC/DC Converter with Improved Disturbance Rejection for Bus Regulation

2018

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Stand-alone power systems based on renewable energy sources are widely used for energy generation in remote locations and for distributed generation in urban environments. The DC bus is an essential component of these systems since it enables power transmission between the sources, loads and batteries. The batteries are interfaced with the bus using a charger/discharger DC/DC converter, which is controlled to regulate the DC bus voltage under any operating conditions. This is an important task because unsafe over-voltages and under-voltages in the bus could damage the sources, loads and power converters. This paper proposes a sliding-mode controller for a charger/discharger DC/DC converter with improved disturbance rejection to provide a tight bus voltage regulation for safe operation. The main novelty of this solution is the inclusion of the bus current in the sliding surface, which accelerates the controller response. Moreover, a formal proof of the system global stability is provided, and a detailed process is developed to calculate the controller and implementation parameters. Finally, the proposed solution is validated through simulations and experiments.

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Section: Background Of the Proposed Solutionmentioning

confidence: 99%

Section: Selection Of the Type Of Dynamic Responsementioning

confidence: 99%

Control of a Charger/Discharger DC/DC Converter with Improved Disturbance Rejection for Bus Regulation

2018

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“…The DC-link capacitance of the AC/DC converter can be quantified according to the average power Eq. ( 9 [24].…”

Section: B Passive Filters Designmentioning

confidence: 99%

Design Optimization and Electro-Thermal Modeling of an Off-Board Charging System for Electric Bus Applications

et al. 2021

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This paper proposes a co-design optimization procedure of a high-power off-board charger for electric vehicle (EV) applications. The primary purpose is to design a 175 kW SiC DC-charging system with high power density to achieve high efficiency at a wide operating range. For the active part of the DC offboard charger, a three-phase active front end (AFE) rectifier topology is considered in the design optimization and the modelling. The design methodology focuses on the optimal design of the passive filters, accurate electro-thermal modelling of the converter, inductor design, capacitor selection, loss and geometric modelling of the passive filters and control system design. The design optimization of the high-power charging system is performed in MATLAB Simulink using a closed-loop dynamic electro-thermal simulation of the off-board charger. The switching frequency, loss and temperature-dependent efficiency of the charger is investigated in parallel. Through this proposed technique, efficiency greater than 96% is achieved at a switching frequency of 40 kHz, along with a smaller size and lower weight of the system. Moreover, it operates with a current total harmonic distortion (THDi) below 3% and a power factor (PF) above 99% at rated power condition.INDEX TERMS co-design, thermal modelling, AFE rectifier, wide bandgap, SiC, passive filter, electric vehicles, fast DC charger

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“…Compared to the proposed equivalent loss curve, two priorart loss profiles (the fixed half sine loss profile and the fixed square loss profile) are also widely accepted [18], [19], [24]. As shown in Fig.…”

Section: Comparison With Other Algorithmsmentioning

confidence: 99%

Simplified Thermal Modeling for IGBT Modules With Periodic Power Loss Profiles in Modular Multilevel Converters

Zhang

Wang

et al. 2019

IEEE Trans. Ind. Electron.

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One of the future challenges in Modular Multilevel Converters (MMCs) is how to size key components with compromised costs and design margins, while fulfilling specific reliability targets. It demands better thermal modeling compared to the state-of-the-arts in terms of both accuracy and simplicity. Different from two-level power converters, MMCs have inherent dc-bias in arm currents and the power device conduction time is affected by operational parameters. A time-wise thermal modeling for the power devices in MMCs is therefore an iteration process and time-consuming. This paper thus proposes a simply analytical thermal modeling method, which adopts equivalent periodic power loss profiles. More importantly, time-domain simulations are not required in the proposed method. Benchmarking of the proposed methods with the prior-art solutions is performed in terms of parameter sensitivity and model accuracy with a case study on a 30-MW MMC system. Experiments are carried out on a specifically designed scaled-down system to verify the electro-thermal aspects. Index Terms-Insulated gate bipolar transistor (IGBT), modular multilevel converter (MMC), power semiconductor, reliability, thermal stress estimation, thermal design.

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A High Power Density Integrated Charger for Electric Vehicles with Active Ripple Compensation

Cited by 12 publications

References 24 publications

Control of a Charger/Discharger DC/DC Converter with Improved Disturbance Rejection for Bus Regulation

Control of a Charger/Discharger DC/DC Converter with Improved Disturbance Rejection for Bus Regulation

Design Optimization and Electro-Thermal Modeling of an Off-Board Charging System for Electric Bus Applications

Simplified Thermal Modeling for IGBT Modules With Periodic Power Loss Profiles in Modular Multilevel Converters

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