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2015 IEEE International Telecommunications Energy Conference (INTELEC)最新文献

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Improved digital control scheme of synchronous rectification for resonant converter at light load conditions 轻载条件下谐振变换器同步整流的改进数字控制方案
Pub Date : 2015-10-01 DOI: 10.1109/INTLEC.2015.7572442
Mitsuru Sato, G. M. Dousoky, M. Shoyama
This paper proposes a synchronous rectification (SR) control scheme for LLC resonant converter by digital controller. In the proposed SR control scheme, conduction detector circuit senses the drain-source voltage of secondary SR switches to detect the state of paralleled body diode. Digital controller tunes the turn-on and turn-off time of SR switches depending on conduction detector circuit output. Proposed SR control scheme can properly achieve SR at full load condition a simple implementation. Furthermore, it is capable of suppressing circulating current from output to input than conventional SR control scheme in light load condition. Thus, proposed SR control scheme can improve efficiency rather than conventional SR control scheme.
提出了一种基于数字控制器的LLC谐振变换器同步整流控制方案。在提出的SR控制方案中,导通检测器电路通过检测二次SR开关的漏源电压来检测并联体二极管的状态。数字控制器根据导通检测器电路输出调节SR开关的通断时间。所提出的SR控制方案可以很好地实现SR在满负荷状态下的简单实现。此外,在轻载条件下,它比传统的SR控制方案更能抑制从输出到输入的循环电流。因此,本文提出的SR控制方案比传统的SR控制方案更能提高效率。
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引用次数: 10
Single-phase 7-level inverter for reducing number of switches 减少开关数量的单相7电平逆变器
Pub Date : 2015-10-01 DOI: 10.1109/INTLEC.2015.7572312
Kosuke Sato, H. Haga, Seiji Kondo Nagaoka
This paper focuses on the circuit which is to reduce the number of switching elements in comparison to a common multi-level inverter NPC inverter. Increasing the number of levels of the output voltage at reduced circuit number switching elements, and performs waveform improvement. Typically, the ratio of the input voltage of the multi-level inverter is E1 : E2 = 1 : 1. When the ratio of the input voltage is 1 : 1, the number of the levels of the output voltage becomes only five-levels. Therefore, it increases the number of levels of the output voltage to a level seven by setting the ratio of the input voltage is E1 : E2=1 : 2. It is subjected to waveform improvement by increasing the number of levels of output voltage. Reducing the number of switching elements is advantageous for downsizing of the cost of the surface and the circuit. The simulated and experimental results demonstrate the effectiveness of seven-level operation in 6-switches inverter. Furthermore, this paper confirms same loss characteristics of the proposed multi-level inverter compare to the conventional NPC inverter.
本文重点研究了与普通多级逆变器相比,减少开关元件数量的电路。在减少电路数量的开关元件上增加输出电压的电平,并进行波形改进。一般情况下,多级逆变器的输入电压之比为E1: E2 = 1:1。当输入电压比为1:1时,输出电压的电平数变为5级。因此,通过设置输入电压的比值为E1: E2= 1:2,将输出电压的电平增加到7级。通过增加输出电压的电平数来改善波形。减少开关元件的数量有利于减小表面和电路的成本。仿真和实验结果验证了六开关逆变器七电平运行的有效性。此外,与传统的NPC逆变器相比,本文证实了所提出的多级逆变器具有相同的损耗特性。
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引用次数: 9
A novel high step-down interleaved converter with coupled inductor 一种具有耦合电感的新型高降压交错变换器
Pub Date : 2015-10-01 DOI: 10.1109/INTLEC.2015.7572421
W. Martínez, J. Imaoka, Yuki Itoh, Masayoshi Yamamoto, K. Umetani
Nowadays, high power density has become essential in networking, telecommunications and computing applications. Additionally, the electronic equipment used in these applications requires a very-low voltage feeding even when its power supply has a much higher voltage rating. Therefore, high step-down converters with high power density performance are required for these applications. Consequently, a novel two-phase interleaved high step-down converter is proposed in order to fulfill the requirements of high power density and high step-down conversion ratio of these applications. The proposed converter addresses the objective by a particular coupled inductor where three windings are only installed in one core. As a result, the proposed converter can achieve higher step-down ratio than the conventional topologies by adding a winding and two switches to the interleaved two phase buck converter, besides the coupled-inductor configuration. In this paper, the novel topology is introduced and analyzed in order to find its conversion ratio operation. Then, the proposed topology is compared to conventional topologies and some improved high step-down converters recently proposed. Finally, the proposed converter is experimentally validated and the results revealed that the proposed converter shows higher step-down conversion ratio than the conventional buck converter with a further increment of 40% in the conversion ratio when the converter is operating at a duty cycle of 30% and ratio of turns of 2.
如今,高功率密度在网络、电信和计算应用中已经变得必不可少。此外,在这些应用中使用的电子设备需要一个非常低的电压馈电,即使其电源具有高得多的额定电压。因此,这些应用需要具有高功率密度性能的高降压变换器。为此,提出了一种新型的两相交错高降压变换器,以满足这些应用对高功率密度和高降压变换器的要求。所提出的转换器通过一个特定的耦合电感来解决这个问题,其中三个绕组仅安装在一个磁芯中。因此,除了耦合电感结构外,通过在交错两相降压变换器中增加一个绕组和两个开关,所提出的变换器可以实现比传统拓扑更高的降压比。本文对这种新型拓扑结构进行了介绍和分析,以找出其转换率运算。然后,将所提出的拓扑结构与传统拓扑结构以及最近提出的一些改进的高降压变换器进行了比较。最后,对该变换器进行了实验验证,结果表明,当变换器工作在占空比为30%、匝数比为2时,该变换器的降压变换器比传统降压变换器具有更高的降压变换器,比传统降压变换器提高了40%。
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引用次数: 9
Z-source with voltage multiplication inverter for grid-tie photovoltaic applications 带电压倍增逆变器的z源,用于并网光伏应用
Pub Date : 2015-10-01 DOI: 10.1109/INTLEC.2015.7572483
O. Abdel-Rahim, H. Funato, J. Haruna
This paper proposes Z-source with voltage multiplication inverter for grid connected Photovoltaic (PV) application. The proposed scheme has two-stage. The first stage consists of Z-source with voltage multiplication converter. The proposed converter has high gain compared to other transformer less topologies and reduced voltage stress on the switch. The second stage assembled from five switch inverter. The purpose of the first stage is to boost the low voltage of the PV module to a voltage level suitable for grid connection and controls the PV modules at Maximum Power Point (MPP). The second stage used to convert DC voltage into AC voltage and inject sinusoidal current with unity power factor into the grid. Model Predictive Control (MPC) is proposed to control the proposed system. MPC has some inherent advantages such as fast tracking, very small settling time and ease of implementation.
本文提出了一种用于并网光伏(PV)应用的z源电压倍增逆变器。拟议的方案分为两个阶段。第一级由z源和电压倍增变换器组成。与其他无变压器拓扑结构相比,所提出的变换器具有高增益,并且减少了开关上的电压应力。第二级由五个开关组成的逆变器。第一阶段的目的是将光伏模块的低压提升到适合并网的电压水平,并将光伏模块控制在最大功率点(MPP)。第二级用于将直流电压转换为交流电压,并向电网注入单位功率因数的正弦电流。提出了模型预测控制(MPC)来控制该系统。MPC具有跟踪速度快、建立时间短、易于实现等固有优势。
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引用次数: 4
High efficiency high density telecom rectifier with GaN device 带GaN器件的高效高密度电信整流器
Pub Date : 2015-10-01 DOI: 10.1109/INTLEC.2015.7572401
Liping Sun, Z. Ding, Desheng Guo, Lihao Yan, Chao Yan
Efficiency and power density are the two most important index of the telecom rectifier development. During recent years, the efficiency of the telecom rectifier is pushed from 92% to 96% and now 98%, this paper however explores the design considerations of super high density (100W/inch3) telecom rectifiers in concert with high efficiency requirements (96%). Specifically, the design considerations of a high switching frequency (1MHz) and high efficiency interleaving totem pole PFC stage with DCM boundary control followed by a high resonant frequency (500kHz), PCB winding based LLC DCDC stage is explained. The wide band device 650V GaN HEMT is used for both PFC stage and D2D stage. Experimental results are presented to validate the design concept to meet the power density and efficiency target.
效率和功率密度是电信整流器发展的两个最重要的指标。近年来,电信整流器的效率从92%提高到96%,现在达到98%,但本文探讨了超高密度(100W/inch3)电信整流器的设计考虑,以满足高效率(96%)的要求。具体来说,解释了高开关频率(1MHz)和高效率交错图腾杆PFC级与DCM边界控制,然后是高谐振频率(500kHz),基于PCB绕组的LLC DCDC级的设计考虑。宽带器件650V GaN HEMT用于PFC级和D2D级。实验结果验证了该设计理念能够满足功率密度和效率目标。
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引用次数: 11
Verification of selective breaking performance by distribution board for data centers 数据中心配电板的选择性破断性能验证
Pub Date : 2015-10-01 DOI: 10.1109/INTLEC.2015.7572290
Hiroshi Ishidate, K. Otomo, Toshihiro Sato
We verified that a large selective breaking capacity could be ensured without using high-performance breakers by conducting breaking tests as a distribution board rather than making the selection based on the catalog specifications of the breaker manufacturer when selecting a breaker for distribution boards in data centers.
我们在为数据中心的配电板选择断路器时,通过将断路器作为配电板进行分断试验,而不是根据断路器制造商的目录规格进行选择,验证了在不使用高性能断路器的情况下,可以确保具有较大的选择性分断能力。
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引用次数: 0
Deadbeat control of power leveling system with EDLC 基于EDLC的电力调平系统无差拍控制
Pub Date : 2015-10-01 DOI: 10.1109/INTLEC.2015.7572313
S. Hamasaki, Hirotaka Fukuda, Yoshihiro Yano, M. Tsuji
Renewable energy system such as a photovoltaic, a wind turbine generation and fuel cell has attracted attention as alternative energy sources of fossil fuel. However, a distributed generating system with the photovoltaic or the wind turbine generation is difficult to obtain a constant power supply. Thus control of power leveling system is required to maintain the balance of power flow for irregular power generation. The system is required to respond to change of voltage balance and bidirectional power flow of charge or discharge. Therefore the bidirectional buck/boost DC/DC converter with an electric double layer capacitor (EDLC) is applied for the control of PL system in this research. And the deadbeat control is applied to the system for obtaining quick and accurate response. This paper discusses the effectiveness of deadbeat control for power leveling unit by experiment.
光伏发电、风力发电和燃料电池等可再生能源系统作为化石燃料的替代能源备受关注。然而,采用光伏发电或风力发电的分布式发电系统很难获得恒定的电力供应。因此,为了保证不规律发电的潮流平衡,需要对电力均衡系统进行控制。要求系统能够响应电压平衡的变化和充放电的双向潮流。因此,本研究采用双电层电容(EDLC)双向降压/升压DC/DC变换器来控制PL系统。为了获得快速准确的响应,系统采用了无差拍控制。通过实验,探讨了功率调平装置无差拍控制的有效性。
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引用次数: 0
A low-cost, real-time monitoring system for PV plants based on ATmega 328P-PU microcontroller 基于atmega328p - pu单片机的低成本光伏电站实时监控系统
Pub Date : 2015-10-01 DOI: 10.1109/INTLEC.2015.7572270
M. Caruso, R. Miceli, P. Romano, G. Schettino, C. Spataro, F. Viola
This paper presents a real-time monitoring system for PV power plants based on a microcontroller Atmega328P-PU. The proposed system, whose performances can be relatively close to those achieved with commercial monitoring systems, is simple, low-cost and open source technology-based. In addition, a user interface, capable to communicate through a wireless network by using a standard communication protocol IEEE 802.15.1, is here presented. From the experimental tests described and discussed in this paper it is demonstrated that the proposed monitoring system provides, with adequate accuracy, all the information about the operating status of the PV plant, even during fault conditions.
介绍了一种基于Atmega328P-PU单片机的光伏电站实时监控系统。该系统具有简单、低成本和基于开源技术的特点,其性能可以相对接近商用监控系统所达到的性能。此外,本文还介绍了一个能够通过无线网络使用标准通信协议IEEE 802.15.1进行通信的用户界面。从本文描述和讨论的实验测试中可以证明,所提出的监测系统能够以足够的精度提供有关光伏电站运行状态的所有信息,即使在故障状态下也是如此。
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引用次数: 13
Hybrid controlled soft-switching half-bridge converter in DCM operation with voltage doubler rectifier for battery charge application 混合控制软开关半桥变换器在DCM操作与倍压整流器的电池充电应用
Pub Date : 2015-10-01 DOI: 10.1109/INTLEC.2015.7572308
S. Abe, J. Yamamoto, T. Ninomiya
This paper proposes a PFM+PWM hybrid controlled soft-switching half-bridge converter which has both benefit of conventional half-bridge converter and LLC converter. Generally, conventional half-bridge converter has good constant current characteristic due to PWM control, however it has some drawbacks of (1) primary side switches and secondary side diodes operate under hard switching, (2) two magnetic components. Meanwhile, the LLC resonant converter has the benefit of achieving ZVS and ZCS, however it can't realize a constant current (CC) characteristic because of resonant fashion. In order to achieve soft-switching and CC characteristic using half-bridge converter, a DCM operation are employed, which can be controlled by PWM+PFM Hybrid Control. In this paper the operating characteristics of the proposed half-bridge converter are experimentally verified. The experimental results for 48Vin, 16Vo, 80W board achieves 90% efficiency and validated this method is useful practically.
本文提出了一种PFM+PWM混合控制的软开关半桥变换器,它兼具传统半桥变换器和LLC变换器的优点。一般来说,传统的半桥变换器由于采用PWM控制,具有良好的恒流特性,但其缺点是:(1)一次侧开关和二次侧二极管在硬开关下工作;(2)两个磁性元件。同时,LLC谐振变换器具有实现ZVS和ZCS的优点,但由于谐振方式的限制,无法实现恒流特性。为了利用半桥变换器实现软开关和CC特性,采用了DCM操作,可以通过PWM+PFM混合控制来控制。本文通过实验验证了所提出的半桥变换器的工作特性。在48Vin, 16Vo, 80W电路板上的实验结果表明,该方法的效率达到90%,验证了该方法的实用性。
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引用次数: 2
Robustness analysis for observer based active damping of LCL filter at different resonant frequencies 基于观测器的LCL滤波器在不同谐振频率下的主动阻尼鲁棒性分析
Pub Date : 2015-10-01 DOI: 10.1109/INTLEC.2015.7572390
M. Gaafar, G. M. Dousoky, M. Shoyama
Active damping of grid-connected LCL filter resonance by means of an observer loop to estimate the capacitor current is a well-known method. However, with variation of the grid side inductance due to grid conditions, the system robustness has to be checked. This work discusses the effect of the observer design on the system robustness against grid side inductance variation. Different values of resonant frequency, lower and higher than a critical value of one-sixth of the sampling frequency, are considered to clarify the system robustness at different resonant frequencies. Simulation and experimental results are presented to confirm the system operation at specific values of grid side inductance and resonant frequency.
利用观测器环估计电容电流对并网LCL滤波器谐振进行主动阻尼是一种众所周知的方法。然而,由于电网条件的变化,电网侧电感会发生变化,因此必须对系统的鲁棒性进行检查。本文讨论了观测器设计对系统抗栅极侧电感变化的鲁棒性的影响。考虑不同的谐振频率值,低于或高于采样频率的六分之一的临界值,以阐明系统在不同谐振频率下的鲁棒性。仿真和实验结果证实了系统在特定栅极电感和谐振频率下的运行。
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引用次数: 1
期刊
2015 IEEE International Telecommunications Energy Conference (INTELEC)
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