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2019 IEEE PES/IAS PowerAfrica最新文献

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Benefits and Challenges of Energy Storage Technologies in High Penetration Renewable Energy Power Systems 储能技术在高渗透可再生能源发电系统中的优势与挑战
Pub Date : 2019-08-01 DOI: 10.1109/PowerAfrica.2019.8928644
S. O. Showers, A. Raji
Due to the intermittent power output of renewable energy sources, energy storage has become unavoidable and necessary in grid connected renewable energy systems. This is applicable in grid connected renewable energy integration, transmission, distribution, micro-grid and ancillary services like voltage regulation, frequency regulation and spinning reserves. In this paper, different energy storage systems are studied and presented, with regards to technology advancement, individual benefits, challenges, and applications, considering their influence on the total power system network. Consideration is given to generation, transmission, distribution and applicability. Different energy storage system (ESS) technologies are reviewed and explored together with benefits of ancillary services on energy storage system on grid connected renewable energy sources. The challenges of high penetration level of renewable energy sources on energy storage application in power systems are investigated considering the technical and economic benefits together with challenges. However, the advancement and growth of potential energy storage system is estimated and investigated accordingly.
由于可再生能源发电的间歇性,储能在并网可再生能源系统中已成为不可避免的和必要的。适用于并网可再生能源并网整合、输配电、微网及调压、调频、自旋储备等辅助业务。本文从技术进步、个体效益、挑战和应用等方面对不同的储能系统进行了研究和介绍,并考虑了它们对整个电网的影响。考虑了发电、输电、配电和适用性。对不同的储能技术进行了综述和探讨,并对并网可再生能源下储能系统辅助服务的优势进行了探讨。从技术经济效益和挑战的角度出发,研究了可再生能源高渗透率对电力系统储能应用的挑战。然而,对潜在储能系统的进步和增长进行了相应的估计和研究。
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引用次数: 18
Power Quality Disturbances Analysis using Two Forms of Wigner-Ville Distribution 基于两种维格纳-维尔分布的电能质量扰动分析
Pub Date : 2019-08-01 DOI: 10.1109/PowerAfrica.2019.8928911
A. A. Ahmad, Abel Ehimen Airoboman, A. Abdulaziz, Habibu Hussaini
Power quality (PQ) is a major concern to both power utilities and consumers due to the widespread use of sensitive loads, power electronic devices and industrial equipments. This paper presents an analysis of PQ disturbances as a first step of their appropriate identification using time-frequency analysis. The research focused on the two most common forms of PQ disturbances in Nigeria: voltage sag and swell. The disturbance analysis was based on two basic forms of Wigner-Ville distribution (WVD); the windowed WVD and the filtered WVD used in conjunction with Hilbert transform. Results obtained showed that both forms of WVD are able to accurately capture the disturbances with concentration of energy along the main power supply frequency of 50Hz within the PQ disturbance duration of 0.1s. The proposed methodology showed that the WVDs would be a good signal processing method for subsequent classification of PQ disturbances in electrical power smart grid.
由于敏感负载、电力电子设备和工业设备的广泛使用,电能质量(PQ)是电力公司和消费者关注的主要问题。本文提出了对PQ干扰的分析,作为使用时频分析进行适当识别的第一步。研究集中在尼日利亚两种最常见的PQ干扰形式:电压凹陷和膨胀。扰动分析基于Wigner-Ville分布(WVD)的两种基本形式;加窗WVD和滤波WVD与希尔伯特变换结合使用。结果表明,在PQ扰动持续时间为0.1s的情况下,两种形式的WVD都能准确捕获主电源频率为50Hz的能量集中扰动。所提出的方法表明,wvd是一种很好的信号处理方法,可用于电力智能电网中PQ干扰的后续分类。
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引用次数: 1
The Dynamics of Capacitive Compensated Grid Connected Squirrel Cage Induction Generators 电容补偿并网鼠笼式感应发电机的动力学研究
Pub Date : 2019-08-01 DOI: 10.1109/PowerAfrica.2019.8928870
M. Bule, O. Ojo, J. Haruna
A wind energy system connected to a series compensated line is studied. The series compensation enhances the power transfer capability but could lead to various forms of oscillations and probable instabilities. Computer simulation is used to show the dynamics of the system and establishes a safe operating region for the studied system. The qd per unit dynamic model of the system is developed while the turbine – generator sub – system is modeled also in per unit using the two mass mechanical model. Simulation studies and steady state analysis of the system are performed including the small signal eigenvalue analysis. It is shown that at high negative slip, the electromagnetic torque and hence the available power increases with increasing level of compensation. However, as the slip decreases to zero, the electromagnetic torque converges to a common value irrespective of the compensation level. For stable operation, increasing compensation level, required an increasing slip.
研究了一种串联补偿线路的风能系统。串联补偿提高了功率传输能力,但会导致各种形式的振荡和可能的不稳定。通过计算机仿真来展示系统的动力学特性,并为所研究的系统建立一个安全操作区域。建立了系统的单位量子量动力学模型,并采用双质量力学模型对汽轮发电机分系统进行了单位量子量动力学建模。对系统进行了仿真研究和稳态分析,包括小信号特征值分析。结果表明,在高负滑移时,电磁转矩和可用功率随补偿水平的增加而增加。然而,当转差减小到零时,无论补偿水平如何,电磁转矩都会收敛到一个公共值。为了稳定运行,增加补偿水平,要求增大滑差。
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引用次数: 0
Single Wire Earth Return Distribution Grids: A Panacea for Rapid Rural Power Penetration in Africa via Regulatory Policy Transfer 单线回地配电网:通过监管政策转移实现非洲农村电力快速渗透的灵丹妙药
Pub Date : 2019-08-01 DOI: 10.1109/PowerAfrica.2019.8928822
B. Nkom, C. Baguley, N. Nair
The Single Wire Earth Return (SWER) system was developed in the 1920s to provide a low-cost means of electricity distribution to sparsely populated rural communities. Since then, it has been in prominent service on all continents except Africa. Its use in Africa has been mostly in the southern and northern parts of the continent, with its virtual non-existence in West and East Africa. This paper highlights a few key research and development strategies to improve the technology, one of which is currently at Technology Readiness Level 5. It also provides a cost comparison of SWER with the regular 3-wire distribution system, by carrying out a fiscal study of the Tuhua SWER grid. The comparison shows that the SWER system is long overdue for large-scale use in Africa, which can be accelerated through the adoption of regulatory policies and best practices developed by countries that are historic users of the technology.
单线接地返回(SWER)系统是在20世纪20年代开发的,为人口稀少的农村社区提供低成本的电力分配手段。从那时起,它在除非洲以外的所有大陆上都有显著的服务。它在非洲的使用主要集中在非洲大陆的南部和北部,在西非和东非几乎不存在。本文重点介绍了改进该技术的几个关键研究和开发策略,其中一个目前处于技术就绪级别5。通过对图化SWER电网的财务研究,提供了SWER与常规三线配电系统的成本比较。比较表明,SWER系统早就应该在非洲大规模使用,可以通过采用该技术的历史用户国家制定的监管政策和最佳做法来加速这一进程。
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引用次数: 3
A Review of Off-Grid Plug-and-Play Solar Power Systems: Toward a New "I Better Pass My Neighbour" Generator 离网即插即用太阳能发电系统综述:走向一种新的“我最好超过我的邻居”发电机
Pub Date : 2019-08-01 DOI: 10.1109/PowerAfrica.2019.8928727
K. Aganah, J. Chukwuma, M. Ndoye
Power consumption in many countries continues to outpace the power generation capabilities of the main grid. To circumvent this challenge, individual households or even entire communities are going off-grid. The most ubiquitous alternative energy sources are from wind- and solar-generated power. From the consumers point of view, the biggest challenge to taking advantages of these resources is usually with the installation of the off-grid system, thus necessitating a plug-and-play architecture. Furthermore, the ability to seamlessly transition to an off-grid generator when the main power grid goes down remains a critical technical challenge. In this paper, we review existing architectures for off-grid plug-and-play power generators. We also present specifications and system architectures for off-grid plug-and-play solar-powered generators that would be well-suited to African countries.
许多国家的电力消耗继续超过主电网的发电能力。为了规避这一挑战,个别家庭甚至整个社区正在脱离电网。最普遍的替代能源是风能和太阳能发电。从用户的角度来看,利用这些资源的最大挑战通常是离网系统的安装,因此需要即插即用架构。此外,当主电网出现故障时,能否无缝过渡到离网发电机仍然是一个关键的技术挑战。在本文中,我们回顾了现有的离网即插即用发电机的结构。我们还提出了离网即插即用太阳能发电机的规格和系统架构,这些发电机将非常适合非洲国家。
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引用次数: 4
Assessment and Analysis of Typical Eskom Secondary Distribution Network under Normal Steady State 典型Eskom二次配电网正常稳态下的评价与分析
Pub Date : 2019-08-01 DOI: 10.1109/PowerAfrica.2019.8928826
O. Taiwo, I. Davidson
To enable secondary distribution network to perform optimally, it is critical to assess the performance of the system. Optimum performance means acceptable voltage profile, increase reliability of supply, no overloading of cables and distribution transformers, absence of imbalances in both voltage and current phases and acceptable loss. This work evaluates the performance of secondary distribution network as a result of voltage losses, voltage deviation, voltage variation and voltage imbalance using MATLAB software. This paper presents a performance analysis of a typical Eskom secondary 11/0.4 kV, unbalanced secondary distribution system. The network was modeled with standard network parameters for secondary Eskom distribution network using MATLAB/Simulink Sim Power System tool box. The summary of the paper gives recommendations on effectual techniques for improving the voltage profile and reducing the voltage imbalance and voltage drop to an allowable standard.
为了使二次配电网达到最佳运行状态,对系统性能进行评估是至关重要的。最佳性能意味着可接受的电压分布,增加供电的可靠性,电缆和配电变压器不过载,电压和电流相位不平衡以及可接受的损耗。本文利用MATLAB软件对二次配电网在电压损失、电压偏差、电压变化和电压不平衡等情况下的性能进行了评估。本文对Eskom公司典型的11/0.4 kV不平衡二次配电系统进行了性能分析。利用MATLAB/Simulink Sim Power System工具箱对Eskom二次配电网的标准网络参数进行建模。本文的总结提出了改善电压分布、降低电压不平衡和电压降至允许标准的有效技术建议。
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引用次数: 1
Technico-economic optimization of Distributed Generation (DG) and Static Var Compensator (SVC) positioning in a real radial distribution network using the NSGA-II genetic algorithm 基于NSGA-II遗传算法的实际径向配电网分布式发电(DG)和静态无功补偿器(SVC)定位的技术经济优化
Pub Date : 2019-08-01 DOI: 10.1109/PowerAfrica.2019.8928631
Oloulade Arouna, Moukengue Imano Adolphe, Adekambi O. Robert, Amoussou Zinsou Kenneth, Vianou Antoine, Badarou Ramanou, Tamadaho Herman, Dangbedji Celestin
Network manager overuse their energy system considering the competition linked to energy sectors economic organization. That induces excessive losses and consequently the degradation of the quality of the power supply. This work consists of optimizing a distribution network of SBEE through the optimal positioning of distributed generator (PV) and SVC in a 138 node HTA departure. Optimization criteria such as losses, installation costs and voltage deviation have been considered and integrated in the NSGA-II algorithm. The algorithms have led to an optimal positioning of a PV system with 1.03MW of power at node 69 and two SVCs of respective powers of 2.07 MVar at node 58 and 2.05 MVar at node 82 of the network. The optimal cost obtained from the simulation is 2,729,000(USD). The NSGA-II algorithm is then a very robust optimization tool, efficient and can be used to optimize electrical grid.
考虑到与能源部门经济组织相关的竞争,网络管理者过度使用他们的能源系统。这会导致过多的损耗,从而导致电源质量的下降。本文通过对分布式发电机(PV)和SVC在138节点HTA出发时的最优定位,对SBEE配电网进行了优化。在NSGA-II算法中考虑并集成了损耗、安装成本和电压偏差等优化准则。该算法得到了一个光伏系统在节点69处功率为1.03MW,两个svc分别在节点58和节点82处功率为2.07和2.05 MVar的最优定位。仿真得到的最优成本为272.9万美元。NSGA-II算法是一种鲁棒性很强的优化工具,效率高,可用于电网优化。
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引用次数: 6
Real-Time Power Control of a Permanent Magnet Synchronous Generator Based Wind Turbine Through a Laboratory Test-Rig 基于实验室试验台的永磁同步风力发电机组实时功率控制
Pub Date : 2019-08-01 DOI: 10.1109/PowerAfrica.2019.8928659
Zenachew Muluneh Hailemariam, R. Leidhold, G. T. Tesfamariam
In this work, a discrete Real-time laboratory test rig is used to control the power or torque of a permanent magnet synchronous generator (PMSG) based Wind Turbine Generator (WTG) to analyze its behavior in a variable speed operation. A Variable Frequency Drive (VFD) controlled Induction Motor (IM) is used as a wind turbine emulator to drive 5kVA PMSG. Moreover, an inverter is directly connected to the stator winding to facilitate the power control of the WTG in real-time under various scenarios. For implementing PI controllers to control the power of the WTG in real-time, Texas instrument TMS320F28069 Digital Signal Processor (DSP) discrete real-time microcontroller control card in a GUASCH board is used. In addition, the simulation model of the system is prepared in MATLAB Simulink to be validated by the results of the test rig. Finally, the achieved results of the simulation and test rig indicate the real-time power control results of the system validates the MATLAB simulation model results of the system.
在这项工作中,使用一个离散的实时实验室试验台来控制基于永磁同步发电机(PMSG)的风力发电机(WTG)的功率或转矩,以分析其在变速运行中的行为。采用变频驱动(VFD)控制的感应电机(IM)作为风力机仿真器驱动5kVA PMSG。逆变器直接接在定子绕组上,便于在各种场景下实时控制WTG的功率。为了实现PI控制器对WTG功率的实时控制,采用了德州仪器TMS320F28069数字信号处理器(DSP)的离散实时微控制器控制卡作为GUASCH板。并在MATLAB Simulink中建立了系统的仿真模型,通过试验台的实验结果对系统进行了验证。最后,通过仿真和试验台取得的结果表明,系统的实时功率控制结果验证了系统的MATLAB仿真模型结果。
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引用次数: 2
High PV Penetration Impact on an Unbalanced Distribution Network 高光伏渗透率对配电网不平衡的影响
Pub Date : 2019-08-01 DOI: 10.1109/PowerAfrica.2019.8928932
Abayomi Adebiyi, Ian Lazaru, A. Saha, Evans Eshiemogie Ojo
With the rapid development of power system and the attendant technological innovative progressions, the objective of accomplishing energy for all is never again a vision but a predictable reality. Therefore, the current grids are facing infrastructural alterations to accomplish the qualities of a smart grid. The structural and performance characteristics of the conventional power generation system is changing with the integration of renewable energy systems (RES) such as photovoltaic (PV) system. This study presents an overview prospect of RES integration in South Africa and evaluated the impact of the increased PV penetration on steady state performance of an IEEE 13 bus test system. Rooftop PVs are incorporated into a portion of a conventional generation source in MATLAB/Simulink environment in which the steady state voltages are examined at different levels of PV penetration. The simulation results clearly revealed the impact of the increased PV penetration on stable state stability.
随着电力系统的快速发展和随之而来的技术创新进步,实现人人享有能源的目标不再是一种愿景,而是可以预见的现实。因此,目前的电网正面临着基础设施改造,以实现智能电网的质量。随着光伏(PV)等可再生能源系统的集成,传统发电系统的结构和性能特征正在发生变化。本研究概述了南非可再生能源整合的前景,并评估了光伏渗透率增加对IEEE 13总线测试系统稳态性能的影响。在MATLAB/Simulink环境中,将屋顶光伏并入传统发电源的一部分,在该环境中,在不同的光伏渗透水平下检查稳态电压。仿真结果清楚地揭示了PV穿透量的增加对稳态稳定性的影响。
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引用次数: 1
Stability study of the interconnection of electricity networks of WAPP countries - case of control zone II (Ghana, Togo & Benin) WAPP国家电网互联稳定性研究——以控制区II(加纳、多哥和贝宁)为例
Pub Date : 2019-08-01 DOI: 10.1109/PowerAfrica.2019.8928660
M. Medewou, P. Chetangny, S. Houndedako, A. Vianou, D. Chamagne, G. Barbier
In the context of the ECOWAS power transmission networks interconnection project led by WEST-AFRICAN POWER POOL (WAPP), a master plan was drawn up in 2004 and updated in 2011. This plan recommended the partitioning of the ECOWAS area into five (05) control zones to ensure effective control of the stability parameters of the interconnected network. This paper is a study of the functioning and stability of the power network of control Zone 2 composed of Benin, Togo and Ghana. After an inventory of the production and transmission infrastructures and the survey of the load curves of each country, the network of the control zone 2 is modeled with the CYME software version 8.1.6 and analyzed with the Newton-Raphson algorithm. With the voltage plans taken from steady state simulation and transient stability tests, technical solutions have been proposed and implemented to improve the zone 2 power network stability.
在西非国家经济共同体输电网络互联项目的背景下,西非电力联运(WAPP)于2004年制定了总体规划,并于2011年进行了更新。该计划建议将西非经共体地区划分为5个控制区,以确保有效控制互联网络的稳定性参数。本文研究了由贝宁、多哥和加纳组成的控制区2电网的运行和稳定性问题。在对生产和输电基础设施进行清查,对各国负荷曲线进行调查后,利用CYME 8.1.6版软件对控制区2的电网进行建模,并采用Newton-Raphson算法进行分析。根据稳态仿真和暂态稳定试验得出的电压方案,提出并实施了提高2区电网稳定性的技术解决方案。
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引用次数: 0
期刊
2019 IEEE PES/IAS PowerAfrica
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