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29th Annual IEEE Applied Power Electronics Conference and Exposition (APEC)

作者： Ren, Xiaoyong Zhang, Qiang Pang, Zhenjin Chen, Qianhong Ruan, Xinbo Nanjing Univ Aeronaut & Astronaut Coll Automat Engn Nanjing Jiangsu Peoples R China

ISBN: (纸本)9781479923250

With computers and servers becoming increasingly widespread, a growing amount of public attention has been focused on improving the efficiency of the server power supply. In this paper, the high-voltage bus converter in the present architecture of the server power supplies is replaced by the multiple output converter to improve the efficiency as there are a variety of loads. Aimed at improving the efficiency, several kinds of multiple output converters are compared and an input-series output-parallel multiple output converter composed of a DCX and a dc-dc converter is put forward. The operation principle of the converter is analyzed, the proper circuit topology is chosen and the control strategy is proposed. The equivalent circuit of the chosen DCX circuit topology is analyzed, based on which, the parameters of the converter are designed according to a white gold server power supply. Finally, a 500 W prototype is built based on the Freescale singlechip MC56F8257, and the experimental waveforms and the tested efficiency curve are given to verify the feasibility of this input-series output-parallel multiple output converter.

关键词： Multiple output input-series output-parallel high efficiency DCX plus dc-dc

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input-series output-parallel Modular Isolated DC-DC Converter Based on 5-Level T-Type Topology 46

Input-Series Output-Parallel Modular Isolated DC-DC Converte...

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46th Annual Conference of the IEEE-Industrial-Electronics-Society (IECON)

作者： Gandomi, Amin Ashraf Parsa, Leila Univ Calif Santa Cruz Jack Baskin Sch Engn Santa Cruz CA 95064 USA

ISBN: (数字)9781728154145

ISBN: (纸本)9781728154145

In this paper, an input-series output-parallel isolated DC-DC converter is proposed for MVDC applications. This structure is based on 5-level modified T-type converter in both primary and secondary sides of high frequency transformer. By using a 5-level converter, better voltage and current waveforms can be obtained in the primary and secondary sides of the transformer which will decrease the filter size. Medium-voltage silicon carbide MOSFETs are used as switches. The proposed structure is modular and uses the same submodules in higher and lower voltage sides. The operation of the proposed structure is verified by simulations carried in PLECS.

关键词： input-series output-parallel modular converter T-type converter PDPWM SiC MOSFETs

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An Efficient Self-Voltage Sharing input-series output-parallel Converters

An Efficient Self-Voltage Sharing Input-Series Output-Parall...

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World Non-Grid-Connected Wind Power and Energy Conference

作者： Cao, Jiankun Yu, Chunlei Wang, Huizhen Nanjing Univ Aeronaut & Astronaut Aeropower Sci Technol Ctr Nanjing 210016 Jiangsu Peoples R China

ISBN: (纸本)9781424447022

This paper deals with high voltage and high power DC-DC converters in the load side of non-grid-connected wind power system. The circuit is based on input-series output-parallel (ISOP) connected DC-DC converters topology because this kind of topology reduce the large voltage stress of all switches in each module. ISOP converters composed of DC-DC transformers which are their basic modules can realize the multi-module voltage balancing and current sharing automatically. Another advantage is each module achieves soft-switching by the resonance between the transformer leakage inductor and the parasitic capacitors of switches. So, the whole converters get high efficient. The scheme is so convenient that we only need to add the number of basic modules when the input voltage increases. Every circuit parameters which possibly influence the voltage sharing are enumerated. The effect of the dynamic voltage balancing is given by the simulation and experimental results. The experimental waveforms show that this kind of ISOP converters not only achieves voltage balancing and current sharing, but also has fast response to dynamic voltage equalization.

关键词： input voltage sharing input-series output-parallel DC-DC transformer soft-switching leakage inductor non-grid-connected wind power

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A Novel Wireless Control Strategy for input-series output-parallel Inverter System 9

A Novel Wireless Control Strategy for Input-Series Output-Pa...

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2017 9th Annual IEEE Energy Conversion Congress & Exposition (ECCE)

作者： Jiang, Xiaojian Cao, Xiaopeng Shu, Liangcai Ning, Guangfu Chen, Wu Southeast Univ Sch Elect Engn Ctr Adv Power Convers Technol & Equipment Nanjing Jiangsu Peoples R China

ISBN: (纸本)9781509029983

In this paper, a wireless modular control strategy for input-series output-parallel (ISOP) inverter system is proposed to ensure equal sharing of input voltage and output current among the constituent inverters. Compared with existing control strategies for the ISOP inverter system, such as centralized control which restricts the modularity of the system and distributed control which realizes voltage and current sharing by means of connecting constituent inverter modules with several sharing buses susceptible to interference and reduces the reliability of the system, the proposed control strategy based on positive output-voltage-amplitude gradient can achieve fully modular design of the ISOP inverter system. Firstly, the control strategy is deduced according to the droop method, and the principle of the control strategy is analyzed in detail. Then the stability and design of the proposed strategy are also explored. At last, a two-module ISOP inverter system is tested in the laboratory and the experimental results verify the effectiveness of the proposed control strategy.

关键词： input-series output-parallel inverter wireless positive output-voltage-amplitude gradient stability

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Hardware and control design considerations for a mobile 1 MW input-series output-parallel (ISOP) DC-DC converter in Medium Voltage range 13

Hardware and control design considerations for a mobile 1 MW...

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13th IEEE Energy Conversion Congress and Exposition (IEEE ECCE)

作者： Tatusch, David Gorodnichev, Anton Haake, Daniel Schnabel, Fabian Friebe, Jens Jung, Marco Leibniz Univ Hannover Inst Drive Syst & Power Elect Hannover Germany Fraunhofer Inst Energy Econ & Energy Syst Technol Converters & Drive Technol Kassel Germany Univ Appl Sci Bonn Rhein Sieg St Augustin Germany

ISBN: (纸本)9781728151359

In this paper hardware and control design considerations for a mobile 1 MW DC-DC converter in Medium Voltage range are presented. The final application will be the supply of electrified agricultural machinery via an autonomous cable drum with power from the MV grid in combination with local renewables like solar, wind or biomass. After rectification from the grid, the 8 kV medium DC voltage allows to efficiently transmit electrical power with reduced cable size. The developed converter converts the 8 kV to 700 V on site. To decrease passive component size, high switching frequency of 50 kHz is achieved with the application of newly developed 3.3 kV SiC devices. A scaled prototype with one fifth current and voltage rating is constructed to demonstrate the feasability of the hardware and control concept.

关键词： SiC input-series output-parallel Medium Voltage DC-DC converter

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Multi-objective Optimization Control for input-series output-parallel Dual-Active-Bridge DC-DC Converter in EER Application 9

Multi-objective Optimization Control for Input-Series Output...

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IEEE 9th International Power Electronics and Motion Control Conference (IPEMC-ECCE Asia)

作者： Zhou, Bingkai Yang, Xiaofeng Nong, Renbiao Li, Zejie Zheng, Trillion Q. Kobrle, Pavel Beijing Jiaotong Univ Sch Elect Engn Beijing Peoples R China Czech Tech Univ Fac Elect Engn Prague Czech Republic

ISBN: (纸本)9781728153018

For reducing backflow power and improving dynamic performance of the input-series output-parallel dual-active-bridge (ISOP-DAB) converter in the electric energy router application, a hybrid control strategy based on the extended-phase-shift (EPS) output voltage model predictive control and gradient descent algorithm (MPC-GDA) is proposed. Firstly, the backflow power models under single-phase-shift (SPS) and EPS control are established, and the output voltage state space averaging equation under EPS control is also derived. Then the output voltage model predictive control is obtained, and the gradient descent algorithm for backflow power optimization is proposed. Finally, the overall control block diagram of the ISOP-DAB based on MPC-GDA control is derived. The simulation models of ISOP-DAB under MPC-GDA and SPS control are built and compared. It is verified that the MPC-GDA control shows better dynamic response and backflow power optimization compared with the traditional SPS control.

关键词： dual-active-bridge input-series output-parallel backflow power model predictive control gradient descent algorithm

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A Stability Analysis Method for input-series output-parallel DC-DC Converter System 9

A Stability Analysis Method for Input-Series Output-Parallel...

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IEEE 9th International Power Electronics and Motion Control Conference (IPEMC-ECCE Asia)

作者： Song, Lei Liu, Peng Duan, Shanxu Liu, Xiaokui Huazhong Univ Sci & Technol Sch Elect & Elect Engn State Key Lab Adv Electromagnet Engn & Technol Wuhan Peoples R China

ISBN: (纸本)9781728153018

In the series-parallel system, it is critical to ensure the stability of the system. However, stability analysis of the system is not as easy as it is in single module especially when the number of the system comes to 3 or even lager. This paper focus on the stability of input-series output-parallel (ISOP) DC-DC converter system, builds the coupling model of n modules and provides the expressions of Routh criterion for n modules. Following, take 4 modules of three-level full-bridge converters as an example to derive its stable range of the parameters of controllers and then the result is verified by the simulation in Matlab. The stability analysis method and the stable range of controller parameters can be a good guidance for the design of PI controllers.

关键词： input-series output-parallel stability analysis PI control three-level full-bridge converters

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Power Sharing Control Strategy of ISOP LLC-DAB Hybrid Bidirectional Converters Based on Multiagent Consensus Theory

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IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS 2025年

作者： Liao, Yuefeng Yang, Zhenkun Yang, Duo Li, Xiang Xu, Guo Liang, Jing Zhengzhou Univ Sch Elect & Informat Engn Zhengzhou 450001 Peoples R China State Key Lab Intelligent Agr Power Equipment Luoyang 471039 Peoples R China Cent South Univ Sch Automat Changsha 410083 Peoples R China

In applications such as dc microgrids and energy storage systems that are characterized by high power and input voltage, input-series output-parallel (ISOP) dc-dc bidirectional converters are widely adopted to intermediate power conversion. The LLC-DAB hybrid bidirectional converter is a single-stage converter, which is composed of LLC resonant circuit and dual active bridge (DAB) circuit. It combines the advantages of LLC and DAB, making it highly suitable for use as a submodule (SM). However, differences in input impedance among these SMs can lead to power imbalance during operation, affecting the performance of the system. To address this problem, a novel power sharing control strategy based on multiagent consensus theory is proposed in this article. This method treats each SM as an agent. By exchanging information with its neighbors, each SM can regulate its power in real- time to achieve power sharing. Additionally, an adaptive dynamic compensator is proposed to compensate for control processes in real-time, thereby reducing settling time of the system. Compared to traditional power sharing strategies, the proposed method not only ensures power sharing among SMs but also improves the dynamic performance of the system. Finally, the effectiveness of the proposed method is demonstrated through an experimental prototype.

关键词： Topology Switches Voltage control Laplace equations Hybrid power systems Transformers Information exchange Consensus algorithm Steady-state Real-time systems Consensus theory input-series output-parallel power sharing control

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Modular Isolated DC-DC Converters for Ultra-Fast EV Chargers: A Generalized Modeling and Control Approach

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ENERGIES 2020年第10期13卷 2540页

作者： ElMenshawy, Mena Massoud, Ahmed Qatar Univ Dept Elect Engn Doha 2713 Qatar

Electric Vehicles (EVs) play a significant role in the reduction of CO2 emissions and other health-threatening air pollutants Accordingly, several research studies are introduced owing to replacing conventional gasoline-powered vehicles with battery-powered EVs. However, the ultra-fast charging (UFC) of the battery pack or the rapid recharging of the battery requires specific demands, including both: the EV battery and the influence on the power grid. In this regard, advanced power electronics technologies are emerging significantly to replace the currently existing gas station infrastructures with the EV charging stations to move from conventional charging (range of hours) to UFC (range of minutes). Among these power electronics conversion systems, the DC-DC conversion stage plays an essential role in supplying energy to the EV via charging the EV's battery. Accordingly, this paper aims to present possible architectures of connecting multiple Dual Active Bridge (DAB) units as the DC-DC stage of the EV fast charger and study their Small-Signal Modeling (SSM) and their control scheme. These are, namely, input-series output-series (ISOS), input-series output-parallel (ISOP), input-parallel output-parallel (IPOP), and input-parallel output-series (IPOS). The control scheme for each system is studied through controlling the output filter inductor current such that the current profile is based on Reflex Charging (RC). The main contribution of this paper can be highlighted in providing generalized SSM as well as providing a generalized control approach for the input-series input-parallel output-series output-parallel (ISIP-OSOP) connection. The generalized model is verified with three different architectures. The control strategy for each architecture is studied to ensure equal power sharing, where simulation results are provided to elucidate the presented concept considering a three-module ISOS, IPOP, ISOP, and IPOS DC-DC converters.

关键词： ultra-fast charging multimodule DC-DC converters dual active bridge DC-DC converter full-bridge phase-shift DC-DC converter input-series output-series input-series output-parallel input-parallel output-parallel input-parallel output-series input-series input-parallel output-series output-parallel

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Multi-Module DC-DC Converter-based Fast Chargers for Neighborhood Electric Vehicles 11

Multi-Module DC-DC Converter-based Fast Chargers for Neighbo...

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11th IEEE Symposium on Computer Applications and Industrial Electronics (ISCAIE)

作者： ElMenshawy, Mena Massoud, Ahmed Qatar Univ Dept Elect Engn Doha Qatar

ISBN: (纸本)9781665403382

To allow a wide adoption of Neighborhood Electric Vehicles (NEVs), low-speed EVs, the EV battery's fast recharging is necessary. This will further increase the utilization of EVs due to the reduced charging duration. To achieve fast recharging, several studies have introduced advanced power electronics technologies to allow wider acceptance for EVs by the public. Among these power electronics conversion systems, the DC-DC conversion stage plays an essential role in supplying energy to the EV via charging the EV's battery. Accordingly, in this paper, a multi-module input-series output-parallel (ISOP) DC-DC converter is presented for NEVs. The multi-module ISOP DC-DC converter is Dual Active Bridge (DAB) based topology. Unlike the conventional ISOP DC-DC converter, only one H-bridge is employed at the input side, while the intermediate high-frequency transformer and the H-bridge employed at the output side are of modular structure. Since only one bridge with a single capacitor is used at the input side, the power balance between the employed DAB units is accomplished via direct output current sharing, where stability is ensured without using the input voltage sharing control approach. Two Matlab/Simulink model is presented to verify the presented concept using reflex charging algorithm, where the first model uses the small-signal model to present the behavior of the converter under transient condition, while the other Matlab/Simulink model is time-domain based simulation. The controller is tested using three DAB units with parameter mismatch where each unit is rated at 1.5 kW to achieve an overall power of 4.5 kW.

关键词： input-series output-parallel Dual Active Bridge Fast Charging Reflex/Burp Charging output Current Sharing input Voltage Sharing

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