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2014 IEEE PES Asia-Pacific Power and Energy Engineering Conference (APPEEC)最新文献

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Harmonic analysis of single-phase grid-connected converter with L filter for distributed generator 分布式发电机L型滤波器单相并网变流器谐波分析
Pub Date : 2014-12-01 DOI: 10.1109/APPEEC.2014.7066125
Botong Li, Bin Li, Huizhi Zhang, Ying Ying
Characteristics of harmonic current generated by single-phase converter with L filter for distributed generator are studied. The variation of transient current in a carrier cycle is derived by the differential equation of the system in time domain. Then compared transient current and fundamental current generated by convertor with no grid, harmonic current under condition of different modulation ratio is analyzed. When and why harmonic current is the largest and smallest in a fundamental cycle is presented through the study of variation tracking capacity of transient current. The maximum and minimum TDD/ with a fixed carrier ratio is proposed. The current generated by the joint action of converter and grid voltage source is also analyzed to explain the relationship of variation tracking and harmonic currents. Simulation results in different operation mode verified the correctness of the proposed theoretical results.
研究了分布式发电机用L型滤波器单相变流器产生的谐波电流特性。利用系统的时域微分方程,推导了载波周期内瞬态电流的变化规律。然后比较了无电网变换器产生的暂态电流和基波电流,分析了不同调制比条件下的谐波电流。通过对暂态电流变化跟踪能力的研究,给出了谐波电流在一个基本周期内最大和最小的时间和原因。提出了固定载波比下的最大和最小TDD/。分析了变流器与电网电压源共同作用产生的电流,解释了变流器变化跟踪与谐波电流的关系。不同运行模式下的仿真结果验证了理论结果的正确性。
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引用次数: 2
Methodology to differentiate type of single-phase line break fault in 10kV ungrounded distribution networks 10kV不接地配电网单相断线故障类型判别方法
Pub Date : 2014-12-01 DOI: 10.1109/APPEEC.2014.7066042
Fangfang Shi, W. Cong
10kV distribution network is always a neutral point ungrounded system. Single-phase line break and grounding fault frequently occurs in 10kV distribution networks, threats the safe and stable operation of power grid and damages people's lives and properties. A methodology to differentiate type of single-phase line break fault is proposed in this paper, which uses sequence network and symmetrical components method to analyze and summarize the voltage and current variation when various single-phase line break fault occurs, then draw the voltage phasor diagram and current phasor diagram. The voltage and current variation and phasor diagrams will provide criteria for the detection and identification of single-phase line break fault in ungrounded distribution networks. Simulation results show the accuracy of the theoretical analysis in this paper.
10kV配电网一直是中性点不接地系统。10kV配电网单相断线接地故障频繁发生,威胁着电网的安全稳定运行,给人民群众的生命财产造成重大损失。提出了一种判别单相断线故障类型的方法,利用序列网络和对称分量法对各种单相断线故障发生时的电压和电流变化进行分析和总结,并绘制电压相量图和电流相量图。电压电流变化图和相量图将为不接地配电网单相断线故障的检测和识别提供依据。仿真结果验证了理论分析的准确性。
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引用次数: 3
An efficient thermal-removal design of GaAs/InGaAs/InGaP HBT-based power amplifiers 基于GaAs/InGaAs/InGaP的高效热消除功率放大器设计
Pub Date : 2014-12-01 DOI: 10.1109/APPEEC.2014.7066028
Y. X. Horng, M. Hsu, H. Tseng
To lessen mutual-thermal-coupling effects, both n-p-n and p-n-p GaAs/InGaAs/InGaP collector-up heterojunction bipolar transistors (HBTs) with an efficient thermal-removal design (TRD), which can be used in power-amplifier circuits for the next-generation renewable-energy system, have been presented in this report. Notably, different from lately proposed thermal-properties-enhancing collector-up structures and thermal-via-hole configurations, the TRD-implemented multi-finger devices, with a graded InGaAs base but without the conventional collector conformation, are demonstrated to achieve compelling heat-removing thermal performance. Preliminary results show that the thermal coupling has been substantially decreased, and nearly 20% improvement, compared to previous work, in the surface temperature-rise ratio is obtained. Unprecedentedly, the TRD has a stronger influence on the p-n-p device than on the n-p-n device based on the pragmatic observations.
为了减少互热耦合效应,本报告提出了具有高效热去除设计(TRD)的n-p-n和p-n-p GaAs/InGaAs/InGaP集电极上异质结双极晶体管(HBTs),可用于下一代可再生能源系统的功率放大器电路。值得注意的是,与最近提出的增强热性能的集热器结构和热通孔配置不同,采用trd的多指器件采用了梯度InGaAs基板,但没有传统的集热器结构,被证明具有令人信服的散热热性能。初步结果表明,热耦合大大降低,表面温升比比提高了近20%。根据语用观察,TRD对p-n-p装置的影响比对n-p-n装置的影响更大,这是前所未有的。
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引用次数: 4
Research on distribution network spare parts demand forecasting and inventory quota 配电网备件需求预测与库存定额研究
Pub Date : 2014-12-01 DOI: 10.1109/APPEEC.2014.7066070
Zeng-qiang Wang, Jiyin Wen, D. Hua
Due to the professionalism and particularity of the power equipment, a reasonable inventory equipment quota forecasting and purchasing plan can guarantee the electrical power construction and maintenance work smoothly. Furthermore, an accurate quota forecasting can also save a large volume of liquid funds for the power companies. This paper establishes a reasonable spare parts demand forecasting and inventory quota model based on SVM algorithm which takes material historical demand, repair schedule, the failure rate of the equipment and operating environment into full consideration. Moreover, the spare parts of electrical equipment in distribution network are divided into Class A, Class B1 and Class B2 through the activity based classification, through which the inventory quota method based on the different types of inventory management model is established. Finally, the calculation results of actual distribution power network show that the proposed SVM model is of high prediction accuracy, providing a simple and effective solution for inventory equipment management of electricity equipment.
由于电力设备的专业性和特殊性,合理的库存设备定额预测和采购计划可以保证电力建设和维修工作的顺利进行。此外,准确的配额预测还可以为电力公司节省大量流动资金。本文在充分考虑物料历史需求、维修计划、设备故障率和运行环境等因素的基础上,建立了合理的备件需求预测和库存配额模型。通过基于活动的分类,将配电网电气设备备件分为A类、B1类和B2类,建立了基于不同类型的库存管理模型的库存定额法。最后,实际配电网的计算结果表明,所提出的SVM模型具有较高的预测精度,为电力设备库存设备管理提供了一种简单有效的解决方案。
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引用次数: 2
Research on nonlinear phenomena of single-phase H-bridge inverter 单相h桥逆变器非线性现象研究
Pub Date : 2014-12-01 DOI: 10.1109/APPEEC.2014.7066158
Yang Ping, Zheng Qunru, Xu Zhirong, Yuan Haozhe, Zheng Yuanhui
In this paper, the bifurcation and chaos in the operation of H-bridge inverter modulated by bipolar SPWM is studied. The one-dimensional discrete iterated mapping model under proportional control is established. Effects of the input voltage E on the system performance are analyzed by using bifurcation diagram, folded diagram. The time-domain waveforms with different proportional coefficients are obtained by Mat-lab/Simulink, which verify the correctness of theoretical analysis. Finally, the nonlinear behavior in the inverter caused by the variation of other circuit parameters like proportional coefficient k, load resistance R, and inductance L is investigated through bifurcation diagrams. The results have important guiding significance and application value for designing and debugging the single-phase H-bridge inverter.
本文研究了双极SPWM调制的h桥逆变器工作中的分岔和混沌问题。建立了比例控制下的一维离散迭代映射模型。利用分岔图、折叠图分析了输入电压E对系统性能的影响。通过matlab /Simulink仿真得到了不同比例系数的时域波形,验证了理论分析的正确性。最后,通过分岔图研究了比例系数k、负载电阻R和电感L等其他电路参数变化对逆变器非线性行为的影响。研究结果对单相h桥逆变器的设计和调试具有重要的指导意义和应用价值。
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引用次数: 6
Study on power control function for double-circuit-on-the-same-tower HVDC transmission systems 双回同塔直流输电系统功率控制功能研究
Pub Date : 2014-12-01 DOI: 10.1109/APPEEC.2014.7065983
Juanjuan Wang, Z. Liang, Xiaocong Xuan, Jinghua Luo, Leilei Xiao
Xiluodu ±500 kV HVDC Double-circuit-on-the-same-tower Transmission Project is the first HVDC transmission project with two HVDC circuits sharing the same converter stations in the world. This project is different from others in that the double circuits may operate independently in single-circuit mode or coordinately in double-circuit mode. This paper analyzes the hierarchical structure of the control systems for this kind of HVDC transmission systems, and studies in depth the double-circuit power control functions according to the unique characteristics of the double-circuit control hierarchies. A simulation model is built in PSCAD / EMTDC for a simulative analysis of three typical operation control modes. The simulation results verify the feasibility of coordinated controls for double-circuit-on-the-same-tower HVDC transmission systems and have a certain guiding significance for actual project operation.
溪洛渡±500千伏高压直流双回同塔输电工程是世界上第一个两路共用同一换流站的高压直流输电工程。与其他项目不同的是,双回路可以在单回模式下独立运行,也可以在双回模式下协同运行。本文分析了该类高压直流输电系统控制系统的层次结构,并根据双回控制层次的独特特点,对双回功率控制功能进行了深入研究。在PSCAD / EMTDC中建立了仿真模型,对三种典型的运行控制模式进行了仿真分析。仿真结果验证了双回同塔直流输电系统协调控制的可行性,对实际工程运行具有一定的指导意义。
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引用次数: 2
Impacts of initial flux on transformer ferroresoance modes 初始磁通对变压器铁磁谐振模式的影响
Pub Date : 2014-12-01 DOI: 10.1109/APPEEC.2014.7066178
S. Ang, Md. Abdus Salam, F. Wen
A ferroresonace circuit consists of a voltage source, a capacitor and a nonlinear inductor connected in series. The initial flux in transformer core plays an important role on the onset of different types of ferroresonance modes. In this paper, the likelihood of the onset of sustained fundamental mode ferroresonance under the influence of the initial flux is investigated. The flux linkage, the voltages across the transformer and the voltage across the series capacitor are investigated by using Matlab toolbox. The initial results are presented and then verified with the simulation results obtained from ATP software. The results between them are found in good agreement.
铁谐振电路由电压源、电容和非线性电感串联而成。变压器铁心初始磁通对不同类型铁磁谐振模式的发生起着重要的作用。本文研究了在初始磁通的影响下,持续基模铁磁共振发生的可能性。利用Matlab工具箱对磁链、变压器两端电压和串联电容两端电压进行了研究。给出了初步结果,并用ATP软件的仿真结果进行了验证。结果表明,两者吻合较好。
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引用次数: 1
Rolling bearings time and frequency domain fault diagnosis method based on Kurtosis analysis 基于峰度分析的滚动轴承时频域故障诊断方法
Pub Date : 2014-12-01 DOI: 10.1109/APPEEC.2014.7066018
Deng Xiao-wen, Yang Ping, Ren Jin-sheng, Yang Yi-wei
When rolling bearing has mechanical localized faults in its various components, pseudo-cyclostationary transient impact signal will be generated. But when in transient faults, this weak impact signal may submerge in strong background noise and gear vibration signal. In this paper, adaptive threshold wavelet de-noising method is used to reduce background noise, then Kurtosis of the noise-reduction signal is calculated in time domain. By comparing the calculation result with a given threshold, a conclusion can be made that whether the bearing is healthy or having mechanical localized faults. When the bearing is diagnosed as faulty in time domain, Kurtogram is used to find out a most suitable pass-band in frequency domain by maximizing the Kurtosis value. Band-pass filtering and do demodulation to this band-pass signal, the faulty component can be positioned precisely and reliably.
当滚动轴承各部件存在机械局部故障时,会产生拟环平稳瞬态冲击信号。但在瞬态故障时,这种微弱的冲击信号可能淹没在强背景噪声和齿轮振动信号中。本文采用自适应阈值小波降噪方法对背景噪声进行降噪,然后在时域上计算降噪信号的峰度。将计算结果与给定的阈值进行比较,可以得出轴承是否健康或是否存在机械局部故障的结论。当轴承在时域被诊断为故障时,利用峰度图在频域通过最大化峰度值来找出最合适的通频带。对该带通信号进行带通滤波和解调,可以准确、可靠地定位故障元件。
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引用次数: 7
Optimal sizing and control strategy of islanded microgrid using PSO technique 基于粒子群优化技术的孤岛微电网优化规模及控制策略
Pub Date : 2014-12-01 DOI: 10.1109/APPEEC.2014.7066004
Yiwei Ma, Ping Yang, Yuewu Wang, Zhuoli Zhao, Qun-ru Zheng
This paper proposes an optimal sizing and control strategy for islanded microgrid, consisting of renewable energy sources such as wind turbine generators (WT) and solar photovoltaic generators (PV), diesel generators (DE) and battery storage system (BS). The problem is formulated to minimize the annualized system cost (ASC) based on a control strategy with two modes. In mode 1, BS is the main power source and DE is backup power, but in mode 2, the master unit is DE and BS assists DE to improve reliability and economic operation benefit. Combination with the control strategy, particle swarm optimization (PSO) is used for a minimized optimization objective of the annualized system cost including initial cost, maintenance and operation (M&O) cost, replacement cost, fuel cost and pollutant emission cost. A case study of an islanded microgrid in Dong'ao Island is introduced to verify the proposed method.
本文提出了一种由风力发电机组(WT)、太阳能光伏发电机组(PV)、柴油发电机组(DE)和电池储能系统(BS)等可再生能源组成的孤岛微电网的优化规模和控制策略。该问题以最小化系统年化成本(ASC)为目标,采用两种模式控制策略。模式1中,BS为主电源,DE为备用电源;模式2中,主机组为DE, BS辅助DE,提高可靠性和经济运行效益。结合控制策略,采用粒子群算法对初始成本、维护运行成本、更换成本、燃料成本和污染物排放成本等系统年化成本进行最小化优化。以东澳岛孤岛微电网为例,对该方法进行了验证。
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引用次数: 14
Forecasting the electricity price in iran power market: A comparison between neural networks and time series methods 伊朗电力市场电价预测:神经网络与时间序列方法之比较
Pub Date : 2014-12-01 DOI: 10.1109/APPEEC.2014.7155724
A. Esmaeili, M. Eghlimi, Zijun Zhang
A comparative analysis of neural networks and statistical time-series methods in the electricity price forecasting of the Iran power market is conducted. An error back propagation algorithm is applied to train neural networks. The time series methods discussed in previous research were considered as benchmarks in the comparison. Two case studies are investigated based on the proposed methods to examine the impact of load ramp in the electric energy price. Only the timeseries of energy price is considered as inputs in the first case and both of the price and load are considered as inputs in the second case. The computational results validate the capability of neural networks in energy price forecasting and indicate that the load ramp is one major factor for determining the energy price.
对神经网络和统计时间序列方法在伊朗电力市场电价预测中的应用进行了对比分析。将误差反向传播算法应用于神经网络的训练。在比较中,我们将之前研究中讨论的时间序列方法作为基准。基于所提出的方法,对两个案例进行了研究,以检验负荷斜坡对电价的影响。在第一种情况下,只考虑能源价格的时间序列作为输入,在第二种情况下,同时考虑价格和负荷的输入。计算结果验证了神经网络在能源价格预测中的能力,表明负荷斜坡是决定能源价格的主要因素之一。
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引用次数: 1
期刊
2014 IEEE PES Asia-Pacific Power and Energy Engineering Conference (APPEEC)
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