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2013 IEEE ECCE Asia Downunder最新文献

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A novel approach for voltage control of multi-terminal DC grids with offshore wind farms 海上风电场多端直流电网电压控制的新方法
Pub Date : 2013-06-03 DOI: 10.1109/ECCE-ASIA.2013.6579223
K. Rouzbehi, A. Miranian, A. Luna, P. Rodríguez
This paper proposes a novel control strategy in multi-terminal DC (MTDC) grids with offshore wind generation based on the idea of generalized voltage droop (GVD). In the proposed strategy, the GVD characteristics are assigned to the voltage-regulating converter station, enhancing their control maneuverability and enabling them to perform necessary DC voltage control and power sharing tasks. By adjusting the coefficients of the corresponding GVD characteristic, a converter station can be operated in three operating modes, namely (1) fixed active power control mode, (2) conventional voltage droop control mode or (3) fixed DC voltage control mode. Results of simulations on a test four-terminal DC grid including two offshore wind farm and two AC grids show the capabilities of the proposed control strategy. Moreover, simulation results confirmed stable operation of the GVD control in transition from one operating mode to another.
本文提出了一种基于广义电压降(GVD)思想的海上风电多端直流电网(MTDC)控制策略。在该策略中,将GVD特性分配给调压换流站,提高了其控制的可操作性,使其能够完成必要的直流电压控制和功率共享任务。通过调整相应的GVD特性系数,换流站可以在三种工作模式下运行,即(1)固定有功功率控制模式,(2)常规电压降控制模式或(3)固定直流电压控制模式。在一个包括两个海上风电场和两个交流电网的四端直流电网上进行了仿真,结果表明了所提出的控制策略的有效性。仿真结果证实了GVD控制在工作模式转换过程中的稳定运行。
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引用次数: 16
A high gain dc-dc converter with voltage multiplier 带电压倍增器的高增益dc-dc变换器
Pub Date : 2013-06-03 DOI: 10.1109/ECCE-ASIA.2013.6579279
Rakesh Sharma, V. Agarwal
A high gain DC-DC converter is proposed in this paper. This converter combines the basic boost converter with voltage doubler circuit to achieve high voltage gain with high efficiency. The novel topology makes use of a single switch to achieve high voltage gain. The voltage appearing across the switch is much lower than the output voltage. Hence, a low voltage rating switch with low on state resistance can be used for this converter. The operation of the converter is explained and steady state analysis is included. Voltage gain equation and expression for voltage across the switch is derived. Representative simulation results are included along with the preliminary experimental results.
本文提出了一种高增益DC-DC变换器。该变换器将基本升压变换器与倍压电路相结合,实现了高效率的高电压增益。这种新颖的拓扑结构利用单个开关实现高电压增益。出现在开关两端的电压比输出电压低得多。因此,该变换器可以使用具有低导通状态电阻的低额定电压开关。说明了变流器的工作原理,并进行了稳态分析。推导了电压增益方程和开关两端电压的表达式。在初步实验结果的基础上,给出了具有代表性的仿真结果。
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引用次数: 15
Ride-through and grid support of the DFIG based wind farm during asymmetrical faults 基于DFIG的风电场在不对称故障时的穿越和电网支持
Pub Date : 2013-06-03 DOI: 10.1109/ECCE-ASIA.2013.6579258
H. Geng, Geng Yang
Grid codes require wind farm to ride through disturbances such as faults and support the grid during such events. Doubly fed induction generator (DFIG) based wind farm with conventional design has limited capability to ride through severe asymmetrical faults due to low capacity of the rotor-side-converter (RSC). DFIG wind turbine with series grid-side converter (SGSC) can help to extend the operation areas during the fault and satisfy the future grid codes. This paper addresses the capacity design and coordinating control scheme of the SGSC-DFIG based wind farm to ride through the severe asymmetrical fault and support the power grid. Considering the control capability of the RSC and the requirements of the present grid code, the SGSC capacity can be minimized if it is employed to compensate part of the negative-sequence grid voltages. By coordinating the control of SGSC and the DFIG, the positive- and negative-sequence reactive current can be carefully regulated to support the grid and satisfy the code requirements. At the same time, the torsional oscillation of the generator shaft can be mitigated by the negative current control. Simulation results verify the effectiveness of the design and scheme.
电网规范要求风电场能够经受住诸如故障之类的干扰,并在此类事件中支持电网。基于双馈感应发电机(DFIG)的风电场,由于转子侧变流器(RSC)容量小,传统设计的风电场穿越严重不对称故障的能力有限。采用串联电网侧变流器(SGSC)的双馈式风力发电机组可以在故障期间扩大运行范围,满足未来电网规范的要求。本文研究了基于SGSC-DFIG的风电场穿越严重不对称故障,支持电网运行的容量设计和协调控制方案。考虑到并联并联系统的控制能力和现行电网规范的要求,利用并联并联系统补偿部分负序电网电压可以使并联并联系统的容量最小化。通过协调SGSC和DFIG的控制,可以精心调节正负序无功电流,以支持电网并满足规范要求。同时,通过负电流控制可以减轻发电机轴的扭振。仿真结果验证了设计和方案的有效性。
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引用次数: 0
Control algorithm of bi-directional power flow rapid charging system for electric vehicle using Li-Ion polymer battery 锂离子聚合物电池电动汽车双向潮流快速充电系统控制算法
Pub Date : 2013-06-03 DOI: 10.1109/ECCE-ASIA.2013.6579143
Taewon Kang, Beomseok Chae, Y. Suh
This paper presents a simple and cost-effective stand-alone rapid battery charging system of 30kW for electric vehicles. The proposed system mainly consists of active front-end rectifier of neutral point clamped 3-level type and non-isolated bi-directional dc-dc converter of multi-phase interleaved half-bridge topology. The charging system is designed to operate for both lithium-polymer and lithium-ion batteries. The complete charging sequence is made up of three sub-interval operating modes; pre-charge mode, constant-current mode, and constant-voltage mode. The pre-charge mode employs the stair-case shaped current profile to accomplish shorter charging time while maintaining the reliable operation of the battery. The proposed system is specified to reach the full-charge state within less than 16min for the battery capacity of 8kWh by supplying the charging current of 78A. Owing to the simple and compact power conversion scheme, the proposed solution has superior module-friendly mechanical structure which is absolutely required to realize flexible power expansion capability in a very high-current rapid charging system.
本文介绍了一种简单、经济的30kW电动汽车独立快速充电系统。该系统主要由中性点箝位型三电平有源前端整流器和多相交错半桥拓扑的非隔离双向dc-dc变换器组成。充电系统的设计适用于锂聚合物电池和锂离子电池。完整的充电顺序由三个子间隔运行模式组成;预充电模式,恒流模式,恒压模式。预充电模式采用阶梯状电流剖面,在保持电池可靠运行的同时,缩短充电时间。该系统在8kWh的电池容量下,通过提供78A的充电电流,在16min内达到完全充电状态。由于该方案的功率转换方案简单紧凑,因此具有良好的模块友好型机械结构,这是在非常大电流的快速充电系统中实现灵活的功率扩展能力所必需的。
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引用次数: 12
High accuracy state-of-charge online estimation of EV/HEV lithium batteries based on Adaptive Wavelet Neural Network 基于自适应小波神经网络的EV/HEV锂电池荷电状态在线高精度估计
Pub Date : 2013-06-03 DOI: 10.1109/ECCE-ASIA.2013.6579145
Feng-wu Zhou, Lujun Wang, Huipin Lin, Zhengyu Lv
The state of charge online estimation of EV/HEV lithium battery with high accuracy is very important, Since it can be used to prolong the battery lifetime and improve its performances. Traditional SOC estimation algorithms have show their drawbacks apparently, so the Adaptive Wavelet Neural Network(AWNN) based SOC estimation model is presented. By using adaptive algorithm to train the model, the accurate online SOC estimation is implemented. The simulation and experiment results are given and show that the proposed algorithm is an effective and feasible method to estimate the SOC of the lithium battery with fastest convergence speed and most high accuracy.
高精度的EV/HEV锂电池充电状态在线估计对于延长电池寿命和提高电池性能具有重要意义。针对传统的荷电状态估计算法存在的明显缺陷,提出了一种基于自适应小波神经网络的荷电状态估计模型。采用自适应算法对模型进行训练,实现了准确的在线SOC估计。仿真和实验结果表明,该算法收敛速度快、精度高,是一种有效可行的锂电池荷电状态估计方法。
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引用次数: 16
LCL-filter design for grid-connected three-phase PWM converter based on maximum current ripple 基于最大纹波电流的并网三相PWM变换器lcl滤波器设计
Pub Date : 2013-06-03 DOI: 10.1109/ECCE-ASIA.2013.6579165
Fang Liu, Xing Zhang, Changzhou Yu, Zhangping Shao, Wei Zhao, Hua Ni
This paper proposes a new design method of LCL-filter for three-phase PWM voltage source inverter. Maximum converter-side current ripple is calculated by defining different modulation section of the adopted PWM strategy. In this way, the method can be easily extended to different converter topology and PWM strategy. Then the result is used to determine converter-side inductance. Once it is fixed, current attenuation passing from converter to grid at switching frequency and reactive power limitation equations are synthesized to design the minimum grid-side inductance and the proper range of resonance frequency. Then according to adopted PWM converter voltage spectrum, choose final resonance frequency to avoid the harmonic frequency spectrum distribution. A design example is given and the simulation and experiment results demonstrate the effectiveness of the method.
提出了一种用于三相PWM电压源逆变器的lc滤波器的新设计方法。通过定义所采用PWM策略的不同调制段,计算变换器侧的最大纹波电流。这样,该方法可以很容易地扩展到不同的变换器拓扑和PWM策略。然后利用结果确定变换器侧电感。确定后,综合开关频率下从变流器到电网的电流衰减和无功限制方程,设计出最小的网侧电感和合适的谐振频率范围。然后根据所采用的PWM变换器电压谱,选择最终谐振频率,避免谐波频谱分布。最后给出了一个设计实例,仿真和实验结果验证了该方法的有效性。
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引用次数: 18
A three-level self-synchronizing hysteresis current regulator with constant switching frequency 一种开关频率恒定的三电平自同步迟滞电流调节器
Pub Date : 2013-06-03 DOI: 10.1109/ECCE-ASIA.2013.6579071
R. Davoodnezhad, D. G. Holmes, B. Mcgrath
While hysteresis current control offers the benefits of a fast dynamic response and inherent overcurrent protection, its variable switching frequency and inherent two-level switching response make it unsuitable for many applications. This paper presents a new approach for three-level hysteresis control of a single phase grid-connected inverter that overcomes these limitations. The strategy adjusts the hysteresis band magnitude in response to variations in the inverter average output voltage, to achieve constant switching frequency using only one hysteresis comparator and without requiring DC offset compensation or current error zero-crossing measurement. The inverter average voltage is also used to estimate the phase of the incoming grid voltage, to create a current reference for the regulator at any required power factor. The result is a robust sensorless hysteresis current regulator suitable for three-level grid connected applications that operates with a constant switching frequency.
虽然迟滞电流控制具有快速动态响应和固有过流保护的优点,但其可变的开关频率和固有的两电平开关响应使其不适合许多应用。本文提出了一种单相并网逆变器三电平迟滞控制的新方法,克服了这些限制。该策略根据逆变器平均输出电压的变化调整磁滞带幅度,仅使用一个磁滞比较器即可实现恒定的开关频率,无需直流失调补偿或电流误差过零测量。逆变器的平均电压也用于估计输入电网电压的相位,以在任何所需的功率因数下为稳压器创建电流参考。结果是一个鲁棒的无传感器迟滞电流调节器适用于以恒定开关频率运行的三电平并网应用。
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引用次数: 4
Integrated DC-DC chopper using Energy Harvesting 集成DC-DC斩波器使用能量收集
Pub Date : 2013-06-03 DOI: 10.1109/ECCE-ASIA.2013.6579219
Tomohiro Takahashi, K. Akatsu
This paper describes a drive system of DC-DC chopper using Energy Harvesting. Thermoelectric devices are applied to an inductance to generate small electric power that results to make a system high efficiency and miniaturization. This paper shows a proposed drive system and a thermoelectric generate system. The system is evaluated by some experimental results.
介绍了一种基于能量收集的直流斩波器驱动系统。热电装置应用于电感产生小功率,从而使系统高效率和小型化。提出了一种驱动系统和热电发电系统。实验结果验证了该系统的有效性。
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引用次数: 1
PWM for active thermal protection in three level neutral point clamped inverters 用于三电平中性点箝位逆变器的主动热保护的PWM
Pub Date : 2013-06-03 DOI: 10.1109/ECCE-ASIA.2013.6579213
T. Phan, G. Riedel, N. Oikonomou, M. Pacas
In high power applications, in which the discrete power switches are mounted on separate heatsinks, an overload of a semiconductor device leads to a local excessive thermal stress and eventually to a failure of the system. Despite of a control strategy that ensures the even distribution of losses in the normal operation, a local thermal overload can arise due to failures in the electronics, in the cooling system, due to an inappropriate positioning of the semiconductor device, etc. In this paper, a new fault tolerant control approach is introduced to deal with this matter. When detecting increased thermal stress of one IGBT module, the switching strategy is altered in order to reduce the load of that particular IGBT module and to redistribute the losses and consequently the heat from the affected group or valve to the other switches. Hence, the temperature of the stressed switch is kept under the critical limit and the thermal overload is reduced. In such way the reliability and the lifetime of the converter is maximized even in case of thermal failure. In the proposed novel modulation concept, the balancing of the neutral point potential of the 3L-NPC Inverter is also ensured without any additional hardware.
在高功率应用中,分立的电源开关安装在单独的散热器上,半导体器件的过载会导致局部过热应力,最终导致系统故障。尽管有一种控制策略可以确保在正常运行中损耗的均匀分布,但由于电子器件、冷却系统、半导体器件的不适当定位等故障,可能会出现局部热过载。本文提出了一种新的容错控制方法来解决这一问题。当检测到一个IGBT模块的热应力增加时,开关策略被改变,以减少该特定IGBT模块的负载,并重新分配损失,从而将热量从受影响的组或阀转移到其他开关。从而使应力开关温度保持在临界温度范围内,减少了热过载。这样,即使在热失效的情况下,转换器的可靠性和寿命也得到了最大化。在提出的新调制概念中,还保证了3L-NPC逆变器中性点电位的平衡,而无需任何额外的硬件。
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引用次数: 24
A high frequency isolated current-fed bidirectional DC/AC converter for grid-tied energy storage system 并网储能系统的高频隔离电流双向DC/AC变换器
Pub Date : 2013-06-03 DOI: 10.1109/ECCE-ASIA.2013.6579111
Xiaolei Hu, K. Tseng, Yitao Liu, S. Yin, Mengqi Zhang
In applications of modern power distribution with distributed energy resources, grid-tied energy storage systems (ESS) will be increasingly incorporated. Energy storage devices (ESD) such as lithium-ion battery or super-capacitor cells however have low DC terminal voltages. It is essential to develop a bidirectional DC/AC converter to interface ESS based on low voltage cells to the higher voltage grid without using high number of cells in series. In this paper a bidirectional current-fed converter with high frequency transformer isolation is proposed. In this proposed topology, a current source inverter (CSI) is used to interface to the grid. A DC/DC converter with High frequency(HF) transformer is used to feed the current to CSI. Low voltage and high voltage side of DC/DC converter can be either Push-Pull or Full-Bridge. The proposed topology has the advantage of reduced component count and simple control strategy. Simulation and hardware results have shown that the proposed circuit can work in charging and discharging of the ESS and the control strategy is effective.
在具有分布式能源的现代配电应用中,并网储能系统(ESS)的应用将越来越多。然而,锂离子电池或超级电容电池等储能设备的直流终端电压较低。开发一种双向DC/AC变换器,将基于低压电池的ESS与高压电网连接起来,而不需要使用大量串联电池。本文提出了一种采用高频变压器隔离的双向电流馈电变换器。在该拓扑结构中,电流源逆变器(CSI)用于与电网连接。采用带高频(HF)变压器的DC/DC变换器将电流馈送到CSI。DC/DC变换器的低压侧和高压侧可采用推挽式或全桥式。该拓扑结构具有元件数量少、控制策略简单等优点。仿真和硬件实验结果表明,所设计的电路可以实现ESS的充放电,控制策略是有效的。
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引用次数: 5
期刊
2013 IEEE ECCE Asia Downunder
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