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2016 International Conference on Energy Efficient Technologies for Sustainability (ICEETS)最新文献

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A novel approach for performance improvement of partially shaded solar arrays 一种改进部分遮阳太阳能电池阵列性能的新方法
S. Vijayalekshmy, G. R. Bindu, S. Iyer
This paper proposes a novel scheme for the total cross tied interconnection of photovoltaic modules for reducing partial shading losses and thus power generation. The performance improvement over classical total-cross-tied connection has been validated by extensive simulation results. The novel scheme of arrangement is also compared with the optimal total cross tied configuration and results show that the new scheme of arrangement showed very similar operational characteristics. The rearrangement of modules is performed without varying the electrical connection of the modules in the array. This reduces the multiple local maxima in power-voltage (P-V) characteristics and improves the nominal voltage of PV array. Thus, tracking of global maximum power point (GMPP) in the present approach is simpler. The performance of the system is investigated for five different shading patterns.
本文提出了一种光伏组件总交叉互连的新方案,以减少部分遮阳损失,从而减少发电。大量的仿真结果验证了该方法相对于传统全交联连接的性能改进。将新布置方案与最优全交扎布置方案进行了比较,结果表明新布置方案具有非常相似的操作特性。模块的重排在不改变阵列中模块的电气连接的情况下进行。这减少了功率-电压(P-V)特性的多个局部最大值,提高了光伏阵列的标称电压。因此,本方法对全局最大功率点(GMPP)的跟踪较为简单。研究了五种不同遮光模式下系统的性能。
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引用次数: 0
Fault Ride Through for a DC ring bus microgrid 直流环形母线微电网的故障穿越
S. Vishnupriya, P. Kanakasabapathy
DC microgrid is gaining more prominence due to the development of renewable resources that generate DC output and also due to the increasing use of DC in end-user equipments. Also with DC system, connection of backup energy storage and small size generation is easier to realize. For any system, disconnecting a part of the system during temporary faults is uneconomical and might lead to network instabilities. To overcome this, the system must possess Fault Ride Through (FRT) capability. FRT is the ability of the system to remain connected during faults. In this paper, FRT for DC ring bus micro-grid system is achieved for temporary faults. After the occurrence of a fault, the system will ride through the fault until a predefined time period is exceeded. When the predefined time period is exceeded, the system classifies the fault as a permanent fault and the system is isolated. The FRT is achieved by supplying a limited amount of current to the fault using Fault Current Limiters (FCL) working with the proposed algorithm.
由于产生直流输出的可再生资源的发展以及终端用户设备中越来越多地使用直流,直流微电网正变得越来越突出。此外,在直流系统中,备用储能与小型发电的连接更容易实现。对于任何系统来说,在临时故障期间断开系统的一部分是不经济的,并且可能导致网络不稳定。为了克服这一点,系统必须具有故障穿越(FRT)能力。FRT是系统在故障期间保持连接的能力。本文实现了直流环母线微电网系统在临时故障情况下的快速前频检测。故障发生后,系统会自动度过故障,直到超过预先设定的时间。当超过设定的时间范围后,系统将故障分类为永久性故障,并对系统进行隔离。FRT是通过使用故障电流限制器(FCL)与所提出的算法一起向故障提供有限的电流来实现的。
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引用次数: 16
Optimal active and Reactive Power dispatch problem solution using Moth-Flame Optimizer algorithm 利用飞蛾-火焰优化算法求解有功和无功优化调度问题
Siddharth A. Parmar, M. Pandya, Motilal Bhoye, I. Trivedi, Pradeep Jangir, Dilip P. Ladumor
In this work, the most common problem of the modern power system named optimal power flow (OPF) is optimized using the novel meta-heuristic optimisation algorithm Moth-Flame Optimizer (MFO). MFO is inspired by the navigation strategy of Moths in universe. MFO has a fast convergence rate due to use of roulette wheel selection method. In order to resolve the optimal power flow problem, standard IEEE-30 bus system is used. MFO is implemented for the solution of proposed problem. The problems considered in the OPF problem are Fuel Cost Reduction, Active Power Loss Minimization, and Reactive Power Loss Minimization. The results obtained by MFO is compared with other techniques such as Flower Pollination Algorithm (FPA) and Particle Swarm Optimizer (PSO). Results shows that MFO gives better optimisation values as compared with FPA and PSO that confirms the effectiveness of the suggested algorithm.
本文采用一种新的元启发式优化算法蛾焰优化器(MFO)对现代电力系统中最常见的最优潮流(OPF)问题进行了优化。MFO的灵感来自于飞蛾在宇宙中的导航策略。由于采用了轮盘赌选择方法,该算法具有较快的收敛速度。为了解决最优潮流问题,采用标准的IEEE-30总线系统。为了解决所提出的问题,采用了多目标优化算法。OPF问题考虑的问题是燃料成本降低、有功功率损耗最小化和无功功率损耗最小化。并将MFO算法的结果与花朵授粉算法(FPA)和粒子群优化算法(PSO)进行了比较。结果表明,与FPA和PSO相比,MFO给出了更好的优化值,证实了所提算法的有效性。
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引用次数: 14
Generalized modeling model of three phase induction motor 三相异步电动机的广义建模模型
Tripti Rai, P. Debre
This paper presents the dynamic simulation of 3-phase induction motor to analyze the performance of the induction machine. by using the reference frame theory. In this paper, Simulink implementation of the induction motor and its mathematical equations are explained in brief using MATLAB/Simulink. The Mathematical equations used for representing the dq0 model of induction motor are in the arbitrary reference frame. This model is useful to study the transient and steady state behavior of the induction motor.
本文对三相异步电动机进行了动态仿真,分析了三相异步电动机的性能。利用参照系理论。本文用MATLAB/Simulink对感应电机的Simulink实现及其数学方程进行了简要的说明。用于表示异步电动机dq0模型的数学方程是在任意参考系中。该模型对研究异步电动机的暂态和稳态特性具有重要意义。
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引用次数: 24
Statistical estimation for fitting wind speed distribution 风速分布拟合的统计估计
S. Chowdhury, S. Dhawan
Wind energy is a prime sector of the composite renewable energy sector which is supposed to be the prime energy producing force in years to come [1]. The ever increasing demand of wind energy and its renewable nature has led to an emphatic push in development of this sector. Wind speed has been one of those important parameters which form the basic element for design of any wind energy system. Thus, in order to build effective systems, exemplary assessment of wind speed deviation is single handedly the most mandatory parameter that is required to be studied. This leads us to investigate probability density functions which are used to describe wind speed frequency distributions. In this paper, we have modeled wind speed characteristics with respect to Weibull, Rayleigh, Gamma distributions and have simultaneously compared them with respect to statistical parameters such as Chi-square error test, Root mean square error and R2 test as ruling criteria to evaluate the pertinence of the respective distribution functions. Weibull and Gamma give a good fit with Weibull giving a better fit.
风能是复合可再生能源领域的主要领域,预计将成为未来几年的主要能源生产力量[1]。对风能及其可再生能源的需求不断增长,促使该行业的发展得到大力推动。风速是构成任何风能系统设计基本要素的重要参数之一。因此,为了建立有效的系统,风速偏差的示范性评估是最需要研究的参数。这导致我们研究用于描述风速频率分布的概率密度函数。在本文中,我们对Weibull、Rayleigh、Gamma分布的风速特性进行了建模,并同时将其与统计参数(如卡方误差检验、均方根误差检验和R2检验)作为判定标准进行了比较,以评价各自分布函数的相关性。威布尔和伽马给出了很好的拟合,威布尔给出了更好的拟合。
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引用次数: 1
Linear quadratic regulator based current control of grid connected inverter for Renewable Energy Applications 基于线性二次调节器的可再生能源并网逆变器电流控制
R. Vinifa, A. Kavitha
Harnessing electrical power from Renewable Energy Sources (RES) to the grid in a more efficient way requires a power electronic converter. But the power electronic devices introduce harmonics thus affecting the quality of power. A high performance controller is essential to control the real and reactive power flow between the RES and grid without affecting the quality of power. In this paper, grid connected Renewable Energy System is modeled as single phase equivalent circuit and an optimal control law is derived using Linear Quadratic Regulator (LQR). The reference currents are generated using instantaneous real - reactive (p - q) theory to have low grid current Total Harmonic Distortion (THD) and power factor closer to unity in the grid side. To show the supremacy of the LQR method, simulation results are compared with the conventional Hysteresis Controller (HC) for three phase three wire system with balanced grid voltage conditions. It is inferred from the results that LQR is superior in its tracking ability and has better stability.
以更有效的方式利用可再生能源(RES)的电力到电网需要一个电力电子转换器。但是电力电子设备会产生谐波,从而影响电能质量。在不影响电力质量的前提下,高性能控制器是控制可再生能源与电网之间的实功率和无功功率流的关键。本文将可再生能源并网系统建模为单相等效电路,并利用线性二次型调节器(LQR)导出了最优控制律。参考电流采用瞬时实-无功(p - q)理论产生,使电网侧总谐波失真(THD)和功率因数更接近于统一。为了证明LQR方法的优越性,将电网电压平衡条件下三相三线系统的仿真结果与传统迟滞控制器(HC)进行了比较。结果表明,LQR具有较好的跟踪能力和较好的稳定性。
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引用次数: 10
Comparison of PI and Fuzzy logic controller implemented in an APF for renewable Power generation 可再生能源发电有源滤波器中PI与模糊控制器的比较
Ashit P. Sharma, Jayesh B. Thakur, Siddhesh V. Surve, D. R. Singh, Siddhesh P. Sawant
In this paper, Active Power Filter (APF) is designed with predictive control scheme using Fuzzy logic controller. The APF consist of a DC link capacitor and a two level four leg voltage source inverter which compensates the current harmonic components and unbalanced current generated by non linear loads. To design the predictive algorithm, the equivalent impedance of the system is calculated by standard procedure. The simulation results show the compensation performance of the active filter and the control scheme under steady state and transient operating conditions. The trigonometric calculation are eliminated and the computational efforts are reduced due to the effective time concept. Simulation result of both PI and Fuzzy logic control are compared.
本文采用模糊控制器对有源电力滤波器(APF)进行预测控制设计。该滤波器由一个直流链路电容和一个二级四支路电压源逆变器组成,用于补偿电流谐波分量和非线性负载产生的不平衡电流。为了设计预测算法,采用标准程序计算系统的等效阻抗。仿真结果显示了有源滤波器在稳态和暂态工况下的补偿性能和控制方案。有效时间概念消除了三角函数计算,减少了计算量。比较了PI控制和模糊逻辑控制的仿真结果。
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引用次数: 2
Voltage decay behaviour of super capacitor 超级电容器的电压衰减特性
A. Latif, A. Sengupta, Meera Kumari, B. Bhattacharyya
Super-capacitor or ultra-capacitor in these days finds its use in many industrial applications. This paper presents a circuit by which we are trying to simulate the voltage decay of super capacitor. In this paper it is shown how a dc power supply can be made to decay just like the voltage decay of super capacitor at a certain fixed output current and output voltage for a buck DC-DC converter.
超级电容器或超级电容器在这些天发现它的用途在许多工业应用。本文提出了一种模拟超级电容器电压衰减的电路。本文介绍了如何使直流电源在一定的固定输出电流和输出电压下,像超级电容器的电压衰减一样发生衰减。
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引用次数: 1
Closed loop control of high step up converter with focus on photovoltaic systems 以光伏系统为研究对象的高升压变换器闭环控制
B. Bose
The high step-up converter is inevitable in a photovoltaic system since it requires a sufficiently high step-up conversion. A high step up converter with coupled inductors could be used for this purpose due to its inherent advantages. It acts as an efficient interface between the PV system and the grid. The output obtained in such a system is found to be fluctuating with load variations. This could escalate numerous issues in the quality of output. A closed loop voltage mode control would be useful in disentangling this issue. The closed loop control is achieved by making use of a PIC microcontroller. The output of the converter is fed to the controller which in turn generates gate pulses to control the two MOSFET switches. The controller varies the duty ratio of the system in accordance to the fluctuations in the load voltage. Also the system is found to be effective while working in high input as well as low input conditions making it efficient during night time and also on rainy days. This study of a high step-up converter can inculcate a confidence that these researches can definitely bring about a revolution in the energy scenario of today.
高升压变换器在光伏系统中是不可避免的,因为它需要足够高的升压变换器。具有耦合电感的高升压变换器由于其固有的优点可用于此目的。它作为光伏系统和电网之间的有效接口。在这种系统中得到的输出随着负载的变化而波动。这可能会使产出质量方面的许多问题升级。一个闭环电压模式控制将有助于解决这个问题。闭环控制是利用PIC单片机实现的。转换器的输出被馈送到控制器,控制器反过来产生栅极脉冲来控制两个MOSFET开关。控制器根据负载电压的波动来改变系统的占空比。此外,该系统在高输入和低输入条件下都能有效地工作,使其在夜间和雨天也能有效地工作。这项高升压变换器的研究可以灌输一种信心,这些研究绝对可以在今天的能源场景中带来一场革命。
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引用次数: 0
Economic Load Dispatch problem with ramp rate limits and prohibited operating zones solve using Levy flight Moth-Flame optimizer 利用Levy飞行飞蛾-火焰优化器求解具有爬坡率限制和禁止操作区域的经济负荷调度问题
I. Trivedi, Arvind Kumar, Avani H. Ranpariya, Pradeep Jangir
A novel bio-inspired optimization algorithm based on the navigation strategy of Moths in universe called the Moth-Flame optimization (MFO) Algorithm, is exercised for Economic Load Dispatch problems. The navigating mechanism of moths in nature called transverse orientation, a very effective mechanism for traveling long distances in the straight direction. In fact, artificial lights trick moths, so they follow a deadly spiral path. MFO algorithm is integrated with levy flights to achieve the competitive results in case of both discrete and continuous control parameters. Levy flights or Levy distribution is a sophisticated randomization technique has a relevant role in both exploration and exploitation. Constrained optimization is a way of optimizing an objective function in presence of constraints on some control parameters. So Levy flights or Levy distribution is a sophisticated randomization technique is integrated with MFO and exercised on highly complex constrained economic load dispatch (ELD) problem with three different standard case study of 6 and 15 generating unit system without valve point effect including ramp rate limits (RRL) and prohibited operating zones (POZ) and 13-unit system with valve point effect loading. Integration of randomization Levy flights technique provides potential that Levy flights based MFO algorithm to attain optimal solution and faster convergence over standard MFO optimization algorithms.
针对经济负荷调度问题,提出了一种基于宇宙飞蛾导航策略的新型仿生优化算法——飞蛾-火焰优化算法。在自然界中,飞蛾的导航机制被称为横向定向,这是一种非常有效的机制,可以在直线方向上长距离飞行。事实上,人造光会欺骗飞蛾,所以它们会沿着一条致命的螺旋路径飞行。将最优解算法与征费飞行相结合,在离散控制参数和连续控制参数下均能获得竞争结果。列维飞行或列维分布是一种复杂的随机化技术,在勘探和开发中都具有重要作用。约束优化是在某些控制参数存在约束的情况下对目标函数进行优化的一种方法。因此Levy飞行或Levy分布是一种复杂的随机化技术,将其与MFO相结合,并对高度复杂的约束经济负荷调度(ELD)问题进行了三种不同的标准案例研究,分别是6和15个发电机组系统,没有阀点效应,包括斜坡速率限制(RRL)和禁止操作区域(POZ),以及13个机组系统,阀点效应加载。随机化Levy飞行技术的集成为基于Levy飞行的MFO算法获得最优解和比标准MFO优化算法更快的收敛速度提供了潜力。
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引用次数: 31
期刊
2016 International Conference on Energy Efficient Technologies for Sustainability (ICEETS)
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