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Switching loss reduction of AC-AC converter using three-level rectifier and inverter for UPS 采用三电平整流器和逆变器的UPS交流变换器的开关损耗降低
Pub Date : 2014-11-01 DOI: 10.1109/PEAC.2014.7037886
K. Yoneda, Hiroki Takahashi, J. Itoh
This paper proposes an AC-AC converter, which consists of T-type three-level rectifier and inverter, for an on-line UPS. The switching loss of the proposed AC-AC converter is drastically reduced because the proposed converter is driven at a very low switching frequency which is six times of input side frequency. The T-type rectifier separates the maximum phase-voltage, medium phase-voltage and minimum phase-voltage from the input voltage. Next the output waveform is built by the T-type inverter from each maximum phase-voltage, middle phase-voltage and minimum phase-voltage. The proposed circuit can achieve not only high efficiency, but also short instantaneous interruption time. Furthermore, the proposed AC-AC converter compensates a voltage dip with changing an operation mode of a rectifier. In this paper, the fundamental operation of the proposed converter is confirmed by simulations and experiments. In addition, the power loss of the proposed converter is compared to a conventional on-line UPS and the efficiency of the proposed converter is 97.1% at rated load in an experiment.
本文提出了一种用于在线UPS的交流-交流变换器,该变换器由t型三电平整流器和逆变器组成。所提出的AC-AC变换器的开关损耗大大降低,因为所提出的变换器是在一个非常低的开关频率下驱动的,它是输入侧频率的六倍。t型整流器从输入电压中分离出最大相电压、中相电压和最小相电压。然后由t型逆变器从每个最大相电压、中相电压和最小相电压构建输出波形。该电路不仅效率高,而且瞬时中断时间短。此外,所提出的交流-交流变换器通过改变整流器的工作模式来补偿电压下降。本文通过仿真和实验验证了该变换器的基本工作原理。实验结果表明,该变换器在额定负载下的效率可达97.1%。
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引用次数: 3
A novel DC voltage control strategy for multiterminal HVDC system with offshore wind farms integration 海上风电场多终端直流系统直流电压控制策略研究
Pub Date : 2014-11-01 DOI: 10.1109/PEAC.2014.7038016
Wenting Li, G. Shi, X. Cai, Naihu Li
DC voltage control and power distribution are significant requirements for multi-terminal HVDC control system. The common voltage droop control has the drawback of failing to keep the dc voltage at a fixed value if active power is fluctuating, and voltage margin method actually controls dc voltage only by one converter at a time. A novel control strategy-Coordinated DC Voltage Control-is thus proposed. This strategy utilizes telecommunication technology to coordinate all the grid side converters to control dc voltage. A stable dc voltage as well as accurate power distribution according to the minimization of power loss or other optimal power flow algorithm can be achieved. The control effects are validated based on a five-terminal HVDC system modeling in PSCAD/EMTDC with three different scenarios, including steady state and dynamic state. The satisfactory simulation results prove the feasibility and robustness of the proposed control strategy.
直流电压控制和配电是多端子直流控制系统的重要要求。常用的电压降控制方法存在有功功率波动时直流电压不能保持在固定值的缺点,而电压裕度法实际上一次只通过一个变换器控制直流电压。提出了一种新的控制策略——直流电压协调控制。该策略利用通信技术协调各电网侧变流器控制直流电压。可以根据功率损耗最小化或其他最优潮流算法实现稳定的直流电压和准确的功率分配。基于PSCAD/EMTDC中的五端高压直流系统建模,在稳态和动态三种不同场景下验证了控制效果。仿真结果证明了所提控制策略的可行性和鲁棒性。
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引用次数: 3
Modeling and stability analysis of digital current-mode controlled Boost converter in z-domain z域数字电流模控制升压变换器的建模与稳定性分析
Pub Date : 2014-11-01 DOI: 10.1109/PEAC.2014.7037861
Yanfeng Chen, Wen He, Bo Zhang, Qingqian Zhang
The Boost converter with digital current-mode control and leading edge modulation is modeled in z-domain first in this paper. The influences of time delay and zero-order holder (ZOH) on digital controlled converters are taken into consideration. Then, the corresponding circuit model is established and simulations are performed to show the effectiveness of the z-model. It's shown by simulations based on the circuit model that lower resolution of DPWM module would cause low-frequency oscillation behaviors in digital current-mode controlled DC-DC converters, which is verified by analysis of eigenvalues' movements based on the z-domain model.
本文首先在z域对具有数字电流模式控制和前缘调制的升压变换器进行了建模。考虑了时延和零阶保持器(ZOH)对数字控制变换器的影响。然后,建立了相应的电路模型,并进行了仿真,验证了z模型的有效性。基于电路模型的仿真表明,低分辨率DPWM模块会导致数字电流模式控制的DC-DC变换器出现低频振荡行为,并通过基于z域模型的特征值运动分析验证了这一点。
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引用次数: 2
A dynamic voltage transient suppression control strategy for microgrid inverter 一种微网逆变器电压瞬态动态抑制控制策略
Pub Date : 2014-11-01 DOI: 10.1109/PEAC.2014.7037855
Rongliang Shi, Xing Zhang, Fang Liu, Haizhen Xu, Lei Tao
China Machinery Industry Standard (CMIS) GB/T 12326-2008 prescribed in the islanded operation mode, microgrid inverter (MGI) output voltage dynamic transient range is less than 10% when the resistive load is switched rapidly between 0% and 100%. The three-loop power virtual synchronous generator (VSG) control methods are commonly used in MGI units to share the loads among the parallel MGIs. However, the transient output voltage of the MGI is beyond the CMIS when the resistive load steps sharply. In order to meet the CMIS, an output voltage differential feedback improved algorithm was employed. Comparing to the traditional control method, the improved method could obtain satisfying dynamic transient voltage suppression, resonance inhibition and improve system stability. These theoretical findings were eventually verified experimentally both on simulation and laboratory prototypes.
中国机械工业标准(CMIS) GB/T 12326-2008规定,在孤岛运行模式下,当电阻性负载在0% ~ 100%之间快速切换时,微网逆变器(MGI)输出电压动态暂态范围小于10%。三环电力虚拟同步发电机(VSG)控制方法是MGI机组中常用的在并联MGI间分担负荷的控制方法。然而,当电阻性负载急剧阶跃时,MGI的瞬态输出电压超过CMIS。为了满足CMIS的要求,采用了输出电压差分反馈改进算法。与传统的控制方法相比,改进后的控制方法可以获得满意的动态暂态电压抑制和谐振抑制,提高了系统的稳定性。这些理论发现最终在模拟和实验室原型上得到了实验验证。
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引用次数: 8
Multi-level cascaded medium frequency isolated power conversion system based on dual active bridge 基于双有源电桥的多级级联中频隔离功率转换系统
Pub Date : 2014-11-01 DOI: 10.1109/PEAC.2014.7038004
Ning Gao, Qiang Chen, Rui Li, X. Cai
This paper addresses a dual active bridge isolated DC-DC convertor into a cascaded battery energy storage system(BESS) with an additional benefit of medium frequency galvanic isolation. The topology, named as multi-level cascaded medium frequency isolated cascaded power conversion system is presented in the beginning of this paper to improve the performance of cascaded BESS. Its working principles, including DAB and cascaded H-bridge PWM converter, are described as a guidance for designing the whole system. Moreover, a downscaled prototype is constructed in the laboratory, and the experimental results obtained from the prototype are provided and discussed in purpose of validating the feasibility of multi-level cascaded medium frequency isolated power conversion system (MFIPCS).
本文讨论了一种双有源桥隔离DC-DC转换器,用于级联电池储能系统(BESS),具有中频电流隔离的额外好处。本文首先提出了多级级联中频隔离级联功率转换系统的拓扑结构,以提高级联BESS的性能。介绍了其工作原理,包括DAB和级联h桥PWM变换器,作为整个系统设计的指导。在实验室搭建了缩小尺寸的样机,给出了样机的实验结果并进行了讨论,目的是验证多级级联中频隔离功率转换系统(MFIPCS)的可行性。
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引用次数: 2
Study on the four quadrants operation of ITER poloidal field converter system ITER极向场转换系统四象限运行研究
Pub Date : 2014-11-01 DOI: 10.1109/PEAC.2014.7037970
H. Yuan, L. Huang, P. Fu, G. Gao, Z. Song
This paper describes a four quadrants converter system for the international fusion tokamak device (ITER) which is now under construction in the south of France. The ITER poloidal field (PF) converter system is thyristor-based and rated for 82 MVA, providing up to ±1.05 kV/± 55 kA dc power to the superconducting magnets to generate a controlled rotating magnetic field for nuclear fusion reactions. First, this paper describes the basic operation modes of the converter system. Then, its dynamic behaviors are analyzed based on the circuit analysis, and control strategies are put forward. Moreover, experiments based on a prototype are performed to verify the effectiveness of the theoretical analysis.
本文介绍了目前正在法国南部建设的国际聚变托卡马克装置(ITER)的四象限转换系统。ITER的极向场(PF)变换器系统基于晶闸管,额定功率为82 MVA,为超导磁体提供高达±1.05 kV/±55 kA的直流功率,为核聚变反应产生可控的旋转磁场。本文首先介绍了变流器系统的基本工作方式。然后,在电路分析的基础上对其动态行为进行了分析,并提出了控制策略。最后,通过样机实验验证了理论分析的有效性。
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引用次数: 4
A flyback converter with multiple ports for power management in DC distribution systems 直流配电系统中用于电源管理的多端口反激变换器
Pub Date : 2014-11-01 DOI: 10.1109/PEAC.2014.7038093
Yajian Tong, Z. Shan, J. Jatskevich, C. Tse
It is of advantage to harvest and dispatch power within a minimal number of conversion steps. This paper proposes a single-stage multi-input multi-output converter (MIMOC), which can be used for interfacing diverse energy sources and loads in future smart homes with dc power distribution architectures. The proposed MIMOC offers compact structure, centralized control, galvanic isolation, and wide voltage conversion ratio with precise voltage regulation. The operation principle of the proposed MIMOC is analyzed. A specific switching pattern is proposed, and a multivariable PI based control scheme is presented that enables budgeting the input powers coming from different sources in addition to regulating several output voltages. Both switch and average models are provided to validate the operation of the proposed MIMOC.
它的优点是在最少的转换步骤内收获和调度功率。本文提出了一种单级多输入多输出转换器(MIMOC),它可以在未来的智能家居中使用直流配电架构连接各种能源和负载。所提出的MIMOC具有结构紧凑、集中控制、电流隔离、宽电压转换比和精确电压调节等优点。分析了所提出的MIMOC的工作原理。提出了一种特殊的开关模式,并提出了一种基于多变量PI的控制方案,该方案除了可以调节多个输出电压外,还可以对来自不同电源的输入功率进行预算。提供了开关模型和平均模型来验证所提出的MIMOC的运行。
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引用次数: 1
Active load balancer on three-phase four-wire distribution systems with constant DC capacitor voltage control for multiple loads 三相四线制配电系统的有源负载平衡器,具有恒定直流电容电压控制
Pub Date : 2014-11-01 DOI: 10.1109/PEAC.2014.7037957
Yoshihiro Hisada, T. Win, Toshihiko Tanaka, Hiroaki Yamada, M. Okamoto, S. Lee
This paper deals with compensation performance of an active load balancer (ALB) with the constant DC capacitor voltage control based strategy under multiple feeders. Instantaneous power flow into the ALB show that the balanced source currents with a unity power factor are obtained on the feeder that is connected to the ALB. Thus the ALB is not over loaded although the constant DC capacitor voltage control based strategy is used under multiple loads. Digital computer simulation is implemented to confirm the validity and high practicability of the ALB with the constant DC capacitor voltage control based on strategy under multiple feeders. A prototype experimental model is also constructed and tested. Simulation and experimental results demonstrate that the ALB with the constant DC capacitor voltage control based strategy compensates the unbalanced active and reactive components on the ALB connected feeder while the unbalanced current conditions are remained on other feeders. Thus, the ALB is not overloaded even it is used in the multiple distribution feeders.
研究了基于直流电容恒压控制策略的主动负载均衡器在多馈线条件下的补偿性能。进入ALB的瞬时功率流表明,在连接到ALB的馈线上获得了具有单位功率因数的平衡源电流。因此,尽管在多个负载下使用了基于恒定直流电容电压控制的策略,但ALB不会过载。通过数字计算机仿真,验证了多馈线下基于策略的直流电容恒压控制ALB的有效性和实用性。建立了原型实验模型并进行了测试。仿真和实验结果表明,基于直流电容恒压控制策略的ALB对ALB连接的馈线上的不平衡有功和无功分量进行了补偿,而其他馈线上的不平衡电流状态保持不变。因此,即使在多个配电馈线中使用,ALB也不会过载。
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引用次数: 0
Analysis and design consideration of a current-fed ZVZCS phase-shifted full-bridge converter 电流馈电ZVZCS移相全桥变换器的分析与设计考虑
Pub Date : 2014-11-01 DOI: 10.1109/PEAC.2014.7037989
Zhong Chen, Mengnan Li, Yang Wang
A new current-fed rectifier based phase-shifted full-bridge (PSFB) converter is proposed in this paper to be suitable for the electrical vehicle application, where the load range is wide and high output voltage is required. The converter can achieve effectively zero-voltage switching (ZVS) for the leading arm and zero-voltage zero-current switching (ZVZCS) for the lagging arm in the whole load range. Compared with the conventional PSFB converter, the presented converter can eliminate the voltage spikes and reverse recovery losses across the output-diodes. It has many remarkable advantages such as simple auxiliary circuit, no duty cycle loss and no energy snubber circuit at secondary side. The operational principle and analysis of the proposed converter are presented and optimum design considerations for some key parameters are also given. To validate the feasibility of the presented topology, a 1kW/300V, 100kHz prototype is implemented and tested.
针对电动汽车负载范围大、输出电压高的要求,提出了一种基于电流馈电整流的移相全桥变换器。该变换器可以在整个负载范围内有效地实现超前臂的零电压切换和滞后臂的零电压零电流切换。与传统的PSFB变换器相比,该变换器可以消除输出二极管之间的电压尖峰和反向恢复损耗。它具有辅助电路简单、无占空比损耗、二次侧无能量缓冲电路等显著优点。介绍了该变换器的工作原理和分析,并对一些关键参数进行了优化设计。为了验证所提出的拓扑结构的可行性,实现了一个1kW/300V, 100kHz的原型并进行了测试。
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引用次数: 0
A new V2H system with single-ended inverter drive bidirectional wireless resonant IPT 单端逆变器驱动双向无线谐振IPT的新型V2H系统
Pub Date : 2014-11-01 DOI: 10.1109/PEAC.2014.7037928
S. Ohara, H. Omori, N. Kimura, T. Morizane, M. Nakaoka, Y. Nakamura
Electric vehicles (EV) offer promise as an effective solution to environmental problems. One of the keys to their successful diffusion is the provision of adequate battery charging infrastructure. In order to create a charging infrastructure by installing equipment in such as locations as carports in private homes, the wireless battery charging system is very suitable. EVs can be used in smart house systems to supplement the energy storage. This vehicle to home (V2H) system essentially requires a bidirectional power transfer feature between the EV and home. This paper presents a new bidirectional inductive power transfer (IPT) system for wireless V2H with simplest components and low cost aiming at wide diffusion for home use. Proposed is a novel type of bidirectional wireless EV charging system with an efficient and compact type single-ended quasi-resonant high-frequency inverter for V2H.
电动汽车有望成为解决环境问题的有效途径。它们成功扩散的关键之一是提供足够的电池充电基础设施。为了在私人住宅的车库等场所安装设备,建立充电基础设施,无线电池充电系统非常合适。电动汽车可以用于智能家居系统,以补充能源储存。这种车到户(V2H)系统本质上需要电动汽车和家庭之间的双向电力传输功能。本文提出了一种新的双向感应功率传输(IPT)无线V2H系统,该系统组件简单,成本低,面向家庭广泛推广。提出了一种新型的电动汽车双向无线充电系统,该充电系统采用高效紧凑的单端准谐振高频逆变器。
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引用次数: 9
期刊
2014 International Power Electronics and Application Conference and Exposition
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