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2017 6th International Conference on Computer Applications In Electrical Engineering-Recent Advances (CERA)最新文献

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The effect of solar power injection on aging of a distribution transformer 太阳能注入对配电变压器老化的影响
Kanhaiya Kumar, G. Kumbhar
To maintain the reliability of power supply, proper functioning of all equipment is necessary. The distribution transformers constitute a major part of a distribution system and its remaining life should be properly investigated. Renewable energy sources are integrated into a distribution system to reduce losses, improving voltage profile and save energy cost. This may affect the life of equipment present in the existing system. In this paper, a practical distribution system with installed rooftop solar photo-voltaic (PV) units is considered for investigation. Total study periods has been divided into three parts. The benefits of PV in terms of the life of the transformers have been quantified for the each part. For PV integration and time-series load flow simulation, MATLAB component objective model (COM) interface of OpenDSS is used. The actual load, load shape, temperature and irradiation data have been collected to prepare input to the simulation model. The results show that there is a considerable decrease in the rate of aging of the distribution transformer.
为了保持供电的可靠性,所有设备的正常运行是必要的。配电变压器是配电系统的重要组成部分,应对其剩余寿命进行合理的研究。将可再生能源集成到配电系统中,以减少损耗,改善电压分布并节省能源成本。这可能会影响现有系统中设备的使用寿命。本文以安装屋顶太阳能光伏发电机组的实际配电系统为研究对象。整个学习时间分为三个部分。光伏在变压器寿命方面的好处已被量化为每个部分。采用OpenDSS的MATLAB组件目标模型(COM)接口进行光伏积分和时间序列潮流仿真。收集了实际载荷、载荷形状、温度和辐照等数据,为仿真模型的输入做准备。结果表明,配电变压器的老化率有较大幅度的降低。
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引用次数: 8
Performance comparison of different vector control approaches for a synchronous reluctance motor drive 同步磁阻电机驱动不同矢量控制方法的性能比较
P. Ghosh, A. Das, G. Bhuvaneswari
In this paper, a comprehensive performance comparison has been made for different vector control methods in Synchronous Reluctance Motor (SynRM). The vector control methods investigated are constant direct axis current control and constant current angle control. Different methods of constant current angle vector control included in this paper are MTPA (Maximum torque per ampere), MPFC (Maximum power factor control) and MTPF (Maximum torque per flux). The SynRM is driven by a current controlled PWM voltage source inverter controlled by a PI speed controller. All these methods have been modelled and simulated in Simulink/MATLAB environment, by keeping the PI controller parameters the same and a thorough comparison has been brought out. A very good performance is achieved for the above mentioned vector control methods and their performance parameters such as response time, torque ripple and peak stator current are being compared. The results obtained from the analysis will help in deciding which of the above vector control techniques can be employed in high performance drive applications such as electric vehicles, ship propulsion, traction, etc., when and under what conditions.
本文对同步磁阻电动机的矢量控制方法进行了全面的性能比较。所研究的矢量控制方法有恒定直轴电流控制和恒定电流角控制。本文介绍的恒流角矢量控制方法有MTPA (Maximum torque per am培)、MPFC (Maximum power factor control)和MTPF (Maximum torque per flux)。SynRM由电流控制的PWM电压源逆变器驱动,由PI速度控制器控制。在保持PI控制器参数不变的情况下,在Simulink/MATLAB环境下对这些方法进行了建模和仿真,并进行了全面的比较。对上述矢量控制方法的响应时间、转矩纹波和定子电流峰值等性能参数进行了比较。从分析中获得的结果将有助于确定哪种上述矢量控制技术可以用于高性能驱动应用,如电动汽车、船舶推进、牵引等,以及何时和在何种条件下。
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引用次数: 13
Optimal sizing of a stand-alone PV/wind/MHP/biomass based hybrid energy system using PSO algorithm 基于粒子群算法的独立光伏/风能/MHP/生物质混合能源系统的最优规模
Anurag Chauhan, V. Dwivedi
In remote areas, local generating plant based on renewable energy sources has been received a greater attention to meet the energy demand. Renewable energy sources (small hydro, solar, wind, biomass etc.) have the sufficient potential in India. Utilizing these sources in stand-alone mode is an appropriate choice for energy access in local areas. The present paper deals with the size optimization of a stand-alone PV/Wind/MHP/Biomass based hybrid energy system for un-electrified village hamlets of Indian state of Uttarakhand. Further, three renewable energy scenarios are considered under the present study. Finally, a simple and efficient Particle Swarm Optimization (PSO) algorithm has been used to optimize the total annual cost (TAC) for each scenario. Expected energy not supplied (EENS) is incorporated as a power reliability constraint while optimal sizing of the system components.
在偏远地区,以可再生能源为基础的当地发电厂受到了更多的关注,以满足能源需求。可再生能源(小水电、太阳能、风能、生物质能等)在印度有足够的潜力。以独立模式利用这些能源是当地能源获取的适当选择。本文讨论了印度北阿坎德邦未通电村庄的独立光伏/风能/MHP/生物质混合能源系统的规模优化。此外,本研究还考虑了三种可再生能源情景。最后,采用一种简单高效的粒子群优化算法(PSO)对不同场景下的总年成本(TAC)进行了优化。在优化系统部件尺寸时,将预期不供能(EENS)作为电力可靠性约束。
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引用次数: 6
A comparative study of PI and PID-based SMC for anti-synchronisation of Vallis system 基于PI和pid的SMC对Vallis系统反同步的比较研究
J. Samantaray, B. K. Roy, P. Singh
The anti-synchronisation between two identical Vallis systems, which describe how temperature fluctuates in the eastern and western regions of the ocean around the equatorial area, is done using sliding mode control. A novel approach of sliding mode control using proportional-integral-derivative-based switching surfaces is devised for the anti-synchronisation. Improvement on the transient response is obtained by this design in comparison with proportional-integral-based switching surfaces. The qualitative and quantitative analyses are done for both the designs. The simulation results confirm the successful achievement of the objective of the paper.
两个相同的Vallis系统之间的反同步是使用滑模控制完成的,Vallis系统描述了赤道附近海洋东部和西部地区的温度波动情况。提出了一种基于比例-积分-导数切换曲面的滑模控制方法。与基于比例积分的开关曲面相比,该设计改善了开关曲面的瞬态响应。对两种设计进行了定性和定量分析。仿真结果证实了本文目标的成功实现。
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引用次数: 0
Comparative analysis of dual active bridge isolated DC to DC converter with single phase shift and extended phase shift control techniques 采用单相移相和扩展移相控制技术的双有源桥隔离DC - DC变换器的比较分析
Anupam Kumar, A. H. Bhat, P. Agarwal
Bidirectional energy transfer capability is the central part of a lot of modern power conversion systems. Preferably, for reduction of size, weight and cost these systems use a single high efficiency power electronic conversion system. A dual active bridge converter having two DC-AC converters connected back to back through an AC inductor/transformer is a common topology used for obtaining high efficiency bidirectional power conversion. Some characteristic features of the DAB converter topology are bidirectional power flow capability, inherent soft switching, high power density, high efficiency, galvanic isolation and low number of passive components. In this paper, circuit operation, design, and comparison of efficiency, switch stress, and closed loop operation for step load variation are discussed. Two common control strategies namely single phase shift, and extended phase shift are compared and respective waveforms are shown.
双向能量传递能力是许多现代电力转换系统的核心部分。优选地,为了减小尺寸、重量和成本,这些系统使用单个高效电力电子转换系统。双有源桥式变换器具有两个DC-AC变换器通过交流电感/变压器背靠背连接,是用于获得高效率双向功率转换的常见拓扑结构。DAB变换器拓扑结构具有双向潮流能力、固有软开关、高功率密度、高效率、电流隔离和无源器件数量少等特点。本文讨论了负载阶跃变化时的电路运行、设计、效率、开关应力和闭环运行的比较。比较了两种常用的控制策略,即单相移相和扩展移相,并给出了各自的波形图。
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引用次数: 20
Investigation of grid-structure interaction of wind turbine driven DFIG using FAST and Simulink 基于FAST和Simulink的风电驱动DFIG网-结构相互作用研究
Ganesh P. Prajapat, N. Senroy, I. Kar
This paper presents the study of the interaction of the electrical dynamics with the structure of the wind turbine. A grid connected Doubly Fed Induction Generator (DFIG) based wind energy conversion system has been considered for the investigation. The dynamical structure of the blade and tower of the wind turbine has been modelled by using Euler-Lagrangian approach while the input mechanical power to the wind turbine and the wind loading on the turbine blades and tower was derived by the Blade Element Momentum (BEM) method considering the aerodynamic properties of the blades. The results obtained from the time-domain simulation offer a deep understanding of the combined interaction of electrical, mechanical structural and aero-dynamical aspect of wind turbine generator system and may further be used to design various control schemes. The model has been validated using NREL's simulation tool, FAST (fatigue, aerodynamics, structures and turbulence) and TurbSim. The structural and aerodynamic data of NREL's 5-MW baseline wind turbine were used for the simulation.
本文研究了风力机结构与电动力学的相互作用。研究了一种基于并网双馈感应发电机(DFIG)的风能转换系统。采用欧拉-拉格朗日方法对风力机叶片和塔架的动力结构进行了建模,并考虑叶片的气动特性,采用叶片元动量法推导了风力机的输入机械功率以及叶片和塔架上的风荷载。时域仿真结果对风力发电机组系统的电气、机械、结构和气动方面的相互作用有了深入的了解,并可用于设计各种控制方案。该模型已使用NREL的模拟工具FAST(疲劳、空气动力学、结构和湍流)和TurbSim进行了验证。利用NREL的5mw基线风力机的结构和气动数据进行仿真。
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引用次数: 2
Passivity based distributed event-triggered load frequency control 基于无源性的分布式事件触发负荷频率控制
P. Bhui
This paper presents a method of reducing data communication burden in multi area load frequency control. An aperiodic event-triggered based control approach has been adopted to reduce the communication bandwidth requirements and governor operations. The control law is computed and actuated only when a pre-defined output dependent event condition is satisfied. The triggering condition in the previously reported works, depends on system states or outputs of all areas which is generally not available in an area control center of a real power system. Therefore a distributed event-triggered load frequency control has been proposed where the triggering condition in an area control center depends on output information of that particular area. A passivity based approach is adopted to ensure the system stability analytically and to derive the event triggering condition. Performance of the proposed controller was shown in terms of RMS error of frequency, tie line deviations and the reduction in communication burden for continuous load change, step load change and plant model variations in a two area test system.
提出了一种减少多区负荷频率控制中数据通信负担的方法。采用了一种基于非周期事件触发的控制方法来减少通信带宽需求和调控器操作。只有当满足预定义的输出相关事件条件时,才计算控制律并驱动控制律。在以往报道的工作中,触发条件取决于系统状态或所有区域的输出,而这在实际电力系统的区域控制中心中通常是不可用的。因此,本文提出了一种分布式事件触发负荷频率控制方法,其中区域控制中心的触发条件取决于该特定区域的输出信息。采用基于无源性的方法,从解析的角度保证系统的稳定性,并推导出事件触发条件。在两区测试系统中,对连续负荷变化、阶跃负荷变化和设备模型变化的频率均方根误差、联络线偏差和通信负担的降低表明了所提控制器的性能。
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引用次数: 2
Optimal load shedding to improve static voltage stability employing black hole optimization algorithm 采用黑洞优化算法优化减载以提高静态电压稳定性
N. K. Sharma, A. Varma, S. C. Choube, S. Yadav
Stability in voltage profile is the core issue in developing and operating electrical power systems and it's violation is reported to be the cause of blackouts all over the word. Voltage collapse can be prevented by providing reactive power support via generators power scheduling, tap changing transformer, reactive power compensating devices, capacitor banks, FACTS devices. Subsequently, the last line of defense for voltage recovery is load shedding. This paper proposes a method to optimize the shedding of load mandatory to revive the stability of point of operation while justifying the operating constraints. Optimal load shedding is done after identification of critical load buses. The approach anticipates the risk of voltage instability in the system using L-index. Black Hole Algorithm (BHA) is employed for efficient optimization of load shedding against voltage collapse. Further, results have been analogized with Bare Bones PSO (BBPSO). The computation is carried on IEEE-14 bus system.
电压分布的稳定性是电力系统开发和运行的核心问题,违反电压分布的稳定性是造成世界各地停电的主要原因。电压崩溃可以通过发电机功率调度、分接变压器、无功补偿装置、电容器组、FACTS装置提供无功支持来防止。随后,电压恢复的最后一道防线是减载。本文提出了一种在合理的运行约束条件下,为恢复运行点的稳定性而对负荷强制卸载进行优化的方法。在确定临界负荷母线后进行最优减载。该方法利用l指数预测系统电压不稳定的风险。采用黑洞算法(BHA)对电压崩溃下的减载进行有效优化。此外,结果已与裸骨PSO (BBPSO)进行了类比。计算在IEEE-14总线系统上进行。
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引用次数: 3
Battery state of charge based algorithm for optimal wind farm power management 基于电池充电状态的最优风电场功率管理算法
Pranav Patel, D. Deb
Battery being an important prospect for energy storage for various applications, we need to use it economically taking battery health into consideration. Taking it in the context of wind farm power generation and management, whenever the forecasting power estimates are higher than the actual wind power, the deficit is supplied through the batteries. In the case of higher actual wind power than the forecasted power, we charge the batteries. This paper focuses on how we should charge and discharge the batteries so that we can decrease the number of storage elements required without harming their effective life. An economic study is presented on how to opt for a suitable methodology to balance the penalty with preferred wind forecasting schemes.
电池是各种应用中储能的重要前景,我们需要在考虑电池健康的前提下经济地使用它。在风电场发电和管理的背景下,每当预测功率估计高于实际风电功率时,就通过蓄电池来提供差额。如果实际风力比预测功率高,我们就给电池充电。本文主要讨论如何对电池进行充放电,从而在不影响电池有效寿命的前提下减少电池所需的存储元件数量。提出了一项关于如何选择一种合适的方法来平衡惩罚与首选风预报方案的经济学研究。
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引用次数: 8
RLMMN adaptive filtering based control scheme for multi-objective GPV system 基于RLMMN自适应滤波的多目标GPV系统控制方案
Srinivas Vedantham, Shailendra Kumar, Bhim Singh, S. Mishra
This paper presents a robust least mean mixed norm (RLMMN) adaptive control scheme for multi-objective grid integrated solar photovoltaic (GPV) system under abnormal grid conditions. The control scheme serves manifold objectives such as load balancing, harmonics elimination, improving active power penetration into the distribution network while having active shunt filtering capabilities. The estimated perturb and observe (EPO) scheme is used to harvest crest power from solar photovoltaic (PV) array under variable atmospheric conditions. The proposed control scheme is robust under impulsive power system environments and has the advantages of low steady-state oscillations, low complexity, less mean square error and good dynamic response. The comparative performance with the conventional algorithms depict the satisfactory performance under dynamic condition. The DC link voltage is adapted in proportion with PCC voltage to reduce VSC (Voltage Source Converter) converter losses and its tripping under weak distributed grid conditions. Test results demonstrate the satisfactory behavior under steady-state and dynamic conditions of load unbalancing, variable solar insolation and grid voltage fluctuations. The total harmonic distortions (THDs) of grid currents are observed within limits of grid codes compliance according to an IEEE 519 standard.
针对多目标并网太阳能光伏发电系统,提出了一种鲁棒最小平均混合范数(RLMMN)自适应控制方案。该控制方案服务于多种目标,如负载平衡,谐波消除,提高有功功率渗透到配电网,同时具有有功分流滤波能力。采用估计摄动与观测(EPO)方案在变大气条件下采集太阳能光伏阵列的峰值功率。所提出的控制方案在脉冲电力系统环境下具有鲁棒性,并且具有稳态振荡小、复杂度低、均方误差小、动态响应好等优点。与传统算法的性能对比表明,该算法在动态条件下具有令人满意的性能。在弱分布式电网条件下,直流链路电压与PCC电压成比例调整,以减少VSC (voltage Source Converter)变换器的损耗和跳闸。试验结果表明,该系统在负荷不平衡、日照变化和电网电压波动等稳态和动态工况下均具有良好的性能。在符合IEEE 519标准的电网规范范围内,观察了电网电流的总谐波畸变(THDs)。
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引用次数: 3
期刊
2017 6th International Conference on Computer Applications In Electrical Engineering-Recent Advances (CERA)
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