Latest Research News on Power Engineering : Nov 2020

Multi-Agent Systems for Power Engineering Applications—Part II: Technologies, Standards, and Tools for Building Multi-agent Systems

This is the second part of a two-part paper that has arisen from the work of the IEEE Power Engineering Society’s Multi-Agent Systems (MAS) Working Group. Part I of this paper examined the potential value of MAS technology to the power industry, described fundamental concepts and approaches within the field of multi-agent systems that are appropriate to power engineering applications, and presented a comprehensive review of the power engineering applications for which MAS are being investigated. It also defined the technical issues which must be addressed in order to accelerate and facilitate the uptake of the technology within the power and energy sector. Part II of this paper explores the decisions inherent in engineering multi-agent systems for applications in the power and energy sector and offers guidance and recommendations on how MAS can be designed and implemented. Given the significant and growing interest in this field, it is imperative that the power engineering community considers the standards, tools, supporting technologies, and design methodologies available to those wishing to implement a MAS solution for a power engineering problem. This paper describes the various options available and makes recommendations on best practice. It also describes the problem of interoperability between different multi-agent systems and proposes how this may be tackled. [1]

Hydropower engineering

Dr. Gulliver feels a text has been needed for 20 years to cover all engineering aspects of hydropower. He feels this book fills the void and provides a valuable service – despite some notable shortcomings, which he points out. He notes the book is organized in a logical manner and emphasizes water-flow aspects, with sections on hydraulics, hydrologic analysis, pressure surges, and turbine similarity, selection, and setting. Dr. Gulliver agrees that water-flow aspects are the most unique to hydropower development, but feels the wide range of subjects is covered too briefly. He feels that the primary value of the book is as a readable, complete introduction to hydropower engineering for engineers and planners unfamiliar with the field – and fully recommends the book for this purpose. However, for practicing hydropower engineers, he lists 15 references at the end of the review, which he feels should be used to supplement. [2]

Synchronized phasor measurements in power systems

The use of time synchronizing techniques, coupled with the computer-based measurement technique, to measure phasors and phase angle differences in real time is reviewed, and phasor measurement units are discussed. Many of the research projects concerned with applications of synchronized phasor measurements are described. These include measuring the frequency and magnitude of phasor, state estimation, instability prediction, adaptive relaying, and improved control. [3]

Design of Reactive Power and Voltage Controllers for Converter-interfaced ac Microgrids

This paper aims at presenting design of two controllers for the study of a microgrid testbed. The response of the microgrid testbed to different short circuits would be investigated under these two control regimes, namely, reactive power and voltage controls. This paper therefore presents design of active power, reactive power and voltage regulators for a converter-interfaced ac microgrid. The design was performed using Simulink Control Design® in the Department of Electrical and Computer Engineering, Curtin University, Sarawak, Malaysia between May 2015 and December 2015.  The microgrid consists of two 5.5kW, 575V wind turbines based on doubly-fed induction generators (DFIGs). The systems designed are pitch control system, active power regulator, reactive power regulator, grid ac voltage regulator, dc bus voltage regulator, grid-side converter current regulator and rotor-side converter current regulator. The time-domain step response analysis for each modeled plant indicated stable performance but poor response. Therefore, regulators were realized in closed-loop feedback architecture. Each regulator was designed using small signal frequency response analysis, resulting in stable systems with satisfactory response. The regulators have been combined to implement two mutually exclusive control regimes: the active power-voltage (PV) control and the active-reactive power (PQ) control. Microgrid short circuit studies have been performed while the effect of control is decoupled, a highly simplified method which does not sufficiently mimic real systems. While attempting to study the microgrid short circuit response under different control regimes in a project which is still ongoing, this paper presents an attempt to design two control regimes for the ac microgrid testbed. [4]

Design and Development of Power Operated Rotary Weeder for Rice

Weeds  are  serious  problem  in  all  crops  but  they  are  even  more  so  in  “kharif” crops. For weed problem  several  study  and  research  work  has  carried  out  for  its  effective  control  and  measure  by  various  cultural,  chemical  and  mechanical method. The present study on design and development of power operated rotary  weeder for mechanical control of weeds in rice includes the  designing and fabrication of engine operated  mechanical  weeder  considering  the  optimum  shape,  size  and  location  of weeding  tools/cutting  blade. The weeder was provided with a 1.30 kW petrol start-kerosene run engine as prime mower. The power is transmitted from engine to ground wheel or traction wheel and to cutting unit was operated by means of belt and pulley. For cutting unit 3 hubs each containing 2 standard L – shaped blades were fitted on rotary shaft. Two ground wheels were provided made up of two different diameter rings to make the operation smooth and prevent jerks. In addition to the traction wheels, a rear gauge wheel was provided for the depth adjustment of cutting unit. After fabrication, the power weeder was tested under field condition. It was found that the power weeder has field capacity of 0.14 ha/h with 91% weeding efficiency and 60% field efficiency. The operational cost was found to be Rs 808.42 per ha. [5]

Reference

[1] McArthur, S.D., Davidson, E.M., Catterson, V.M., Dimeas, A.L., Hatziargyriou, N.D., Ponci, F. and Funabashi, T., 2007. Multi-agent systems for power engineering applications—Part II: Technologies, standards, and tools for building multi-agent systems. IEEE Transactions on power systems, 22(4), pp.1753-1759.

[2] Warnick, C.C., 1984. Hydropower engineering.

[3] Phadke, A.G., 1993. Synchronized phasor measurements in power systems. IEEE Computer Applications in power, 6(2), pp.10-15.

[4] Aminu, M. A. (2016) “Design of Reactive Power and Voltage Controllers for Converter-interfaced ac Microgrids”, Current Journal of Applied Science and Technology, 17(1), pp. 1-14. doi: 10.9734/BJAST/2016/25787.

[5] Mahilang, K. K., Choudhary, S., Victor, V. M., ., N. and Sonboier, K. (2017) “Design and Development of Power Operated Rotary Weeder for Rice”, Current Journal of Applied Science and Technology, 24(5), pp. 1-7. doi: 10.9734/CJAST/2017/37844.

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