scispace - formally typeset
Search or ask a question
Proceedings ArticleDOI

Variable speed pumping in thermal and nuclear power plants: Frequency converter versus hydrodynamic coupling

01 Dec 2011-pp 228-234
TL;DR: In this article, a case study analysis of flow control methods and appropriate technical implementations for high-power pump systems employed in thermal and nuclear power plants or heating plants is presented, where the main attention is focused on a comparison of two advanced variable speed control strategies employing VSD with frequency converter and VSD using hydrodynamic coupling.
Abstract: In this paper, a comprehensive case study analysis of flow control methods and appropriate technical implementations for high-power pump systems employed in thermal and nuclear power plants or heating plants will be presented. The main attention is focused on a comparison of two advanced variable speed control strategies employing VSD with frequency converter and VSD with hydrodynamic coupling.
Citations
More filters
Proceedings ArticleDOI
07 May 2015
TL;DR: In this paper, a new control method for the nuclear unit's medium voltage large pumps, using state-of-the-art variable frequency drives, was proposed to increase reliability of the power production process and the significant decrease in overall plant internal services energy consumption, up to 12.4%.
Abstract: The presented paper deals with an assessment study regarding the implementation of the energy efficiency concept in Nuclear Power Plants. This concept is mainly related to Directive 27/2012 of the European Parliament and the Council regarding the 20% set percent reduction in total energy consumption. For achieving this objective the authors propose a new control method for the nuclear unit's medium voltage large pumps, using state-of-art variable frequency drives. In order to prove the effectiveness of this method specific computational simulation software is performed, using CANDU reactor specific data. The main benefits using this approach are the increase reliability of the power production process and the significant decrease in overall plant internal services energy consumption, up to 12.4%. This percent can contribute to energy efficiency set percent with a total share of 15 MWh of 7600 MW which represents the current Romanian energy production capacity.

6 citations


Cites background from "Variable speed pumping in thermal a..."

  • ...The international research [5][6][7][8][9][10], especially the American (U....

    [...]

Proceedings ArticleDOI
01 Oct 2018
TL;DR: In this article, the authors show that the acceleration performance of a nuclear power plant with a WWER can be increased by introducing an additional regulation parameter when installing the variable-frequency drive of the main circulating pump, which has long existed with reactors with fast neutrons.
Abstract: Decompaction of electric load graphs under the condition of insufficiency of maneuverable capacities (especially in the power systems of the European part of the Russian Federation, with the increasing share of nuclear generation) determines the need to involve nuclear power units in maneuvering modes according to the dispatch schedule. In the long term, nuclear power plants should be ready for long-term operation with a certain (optimal) power reserve in the regime of readiness for a rapid increase of the load for emergency control of the frequency in the event of its fall and a rapid decrease of the load with an overabundance of generation in an unacceptable frequency increase situation. In the most severe situations with a long drop in frequency, the acceleration performance of a nuclear power plant with a WWER can be increased by introducing an additional regulation parameter – the coolant flow rate when installing the variable-frequency drive of the main circulating pump, which has long existed with reactors with fast neutrons, and also with some BWRs in USA. The article shows the additional advantages of the installation of variable frequency drive of the main circulation pump. Firstly, this makes it possible to amplify the impulses of the load change, much more quickly realizing them through a change in the coolant flow rate. Secondly, by increasing the number of revolutions of the main circulation pump, it is possible to increase the permissible value of the heat exchange crisis (DNBR), which will expand (in conjunction with other modernizations) the range of power increase.

2 citations

Proceedings ArticleDOI
24 Dec 2012
TL;DR: This paper presents the developed software tool, methodology and physical background of modeling with the emphasis on comparison of conventional flow control methods to variable speed drives (VSDs).
Abstract: Fan systems, pumping systems and compressed air systems consume approximately 60% of total electricity generated worldwide. At the same time, these systems have very significant cost-effective energy saving potential. Nevertheless, the major barriers to effectively and widely apply the generally known recommendations are i) the need of individual evaluation of each application for concrete facilities ii) the lack of methodology and/or tools that would be able to sufficiently and reliably quantify the real energy saving potential for the most suitable technology both from technological and economical point of view. In this paper, we present the results of the research project which is intended to overcome these barriers. By specific, we present the developed software tool, methodology and physical background of modeling with the emphasis on comparison of conventional flow control methods to variable speed drives (VSDs). Case study results are also included.

1 citations

Proceedings ArticleDOI
01 Sep 2015
TL;DR: In this article, the authors presented a complex solution including both robust encoderless PMSM drive control and intelligent master control of hydraulic performance of the pump ensuring transformation of pump natural hydraulic curve which leads to significant energy savings in the heating applications.
Abstract: The paper presents developed algorithms for energy efficient sensorless control of pump for hydraulic systems of heating applications. It is presented the complex solution including both robust encoderless PMSM drive control and intelligent master control of hydraulic performance of the pump ensuring transformation of the pump natural hydraulic curve which leads to significant energy savings in the heating applications. Proposed solution has been proved on the laboratory model of the heating system. Achieved results and comparison to fixed speed heating pump are presented including limitations of the developed algorithm and perspective ways of further research.

1 citations


Cites background from "Variable speed pumping in thermal a..."

  • ...However until now, the impact has been paid especially for a high-power applications like boiler feed pumps [6], water circulation pumps in power plants [7], pumping stations and others with the power of hundreds kilowatts to several megawatts....

    [...]

References
More filters
Journal ArticleDOI
TL;DR: This paper first presents a brief overview of well-established multilevel converters strongly oriented to their current state in industrial applications to then center the discussion on the new converters that have made their way into the industry.
Abstract: Multilevel converters have been under research and development for more than three decades and have found successful industrial application. However, this is still a technology under development, and many new contributions and new commercial topologies have been reported in the last few years. The aim of this paper is to group and review these recent contributions, in order to establish the current state of the art and trends of the technology, to provide readers with a comprehensive and insightful review of where multilevel converter technology stands and is heading. This paper first presents a brief overview of well-established multilevel converters strongly oriented to their current state in industrial applications to then center the discussion on the new converters that have made their way into the industry. In addition, new promising topologies are discussed. Recent advances made in modulation and control of multilevel converters are also addressed. A great part of this paper is devoted to show nontraditional applications powered by multilevel converters and how multilevel converters are becoming an enabling technology in many industrial sectors. Finally, some future trends and challenges in the further development of this technology are discussed to motivate future contributions that address open problems and explore new possibilities.

3,415 citations

Book
07 Aug 2009
TL;DR: Georgilakis et al. as mentioned in this paper introduced a novel approach to transformer design using artificial intelligence (AI) techniques in combination with finite element method (FEM) to increase reliability while reducing cost.
Abstract: Increasing competition in the global transformer market has put tremendous responsibilities on the industry to increase reliability while reducing cost Spotlight on Modern Transformer Design introduces a novel approach to transformer design using artificial intelligence (AI) techniques in combination with finite element method (FEM) Today, AI is widely used for modeling nonlinear and large-scale systems, especially when explicit mathematical models are difficult to obtain or completely lacking Moreover, AI is computationally efficient in solving hard optimization problems On the other hand, FEM is particularly capable of dealing with complex geometries, and also yields stable and accurate solutions Many numerical examples throughout the book illustrate the application of the techniques discussed to a variety of real-life transformer design problems, including: problems relating to the prediction of no-load losses; winding material selection; transformer design optimisation; and transformer selection Spotlight on Modern Transformer Design is a valuable learning tool for advanced undergraduate and graduate students, as well as researchers and power engineering professionals working in electric utilities and industries, public authorities, and design offices Pavlos S Georgilakis is currently Assistant Professor at the Production Engineering and Management Department of the Technical University of Crete (TUC), Greece He has worked in the transformer industry for ten years before joining the TUC He is the author of two books, more than 50 journal papers and 70 conference papers

131 citations


"Variable speed pumping in thermal a..." refers background in this paper

  • ...The efficiency of the transformer is dependent upon the load of the transformer and upon the character of the load - power factor [6]....

    [...]

01 Jan 2004
TL;DR: This overview provides highlights from Variable Speed Pumping A Guide To Successful Applications, which has been developed by Europump and the Hydraulic Institute as a primer and tool to assist plant owners and designers as well as pump, motor, and drive manufacturers and distributors.
Abstract: Author(s): Tutterow, Vestal; McKane, Aimee T. | Abstract: Pumping systems account for nearly 20% of the world's energy used by electric motors and 25% to 50% of the total electrical energy usage in certain industrial facilities. Significant opportunities exist to reduce pumping system energy consumption through smart design, retrofitting, and operating practices. In particular, the many pumping applications with variable-duty requirements offer great potential for savings. The savings often go well beyond energy, and may include improved performance, improved reliability, and reduced life cycle costs.Most existing systems requiring flow control make use of bypass lines, throttling valves, or pump speed adjustments. The most efficient of these is pump speed control.When a pump's speed is reduced, less energy is imparted to the fluid and less energy needs to be throttled or bypassed. Speed can be controlled in a number of ways, with the most popular type of variable speed drive (VSD) being the variable frequency drive (VFD). Pump speed adjustment is not appropriate for all pumping systems, however. This overview provides highlights from Variable Speed Pumping A Guide To Successful Applications, which has been developed by Europump and the Hydraulic Institute as a primer and tool to assist plant owners and designers as well as pump, motor,and drive manufacturers and distributors. When the requirements of a pump and system are understood, the user can consult this guide to help determine whether variable speed pumping is the correct choice. The guide is applicable for both new and retrofit installations and contains flowcharts to assist in the selection process.

54 citations

Proceedings ArticleDOI
01 Sep 2010
TL;DR: In this paper, a developed software for design and optimization of variable speed drives (VSDs) for high-power water pumps and fans in power and heating plants is presented.
Abstract: This paper deals with a developed software for design and optimization of variable speed drives (VSDs) for high-power water pumps and fans in power and heating plants. The paper presents the physical background of modeling and proposed models of a variable speed drive with frequency converter.

6 citations


"Variable speed pumping in thermal a..." refers background or methods in this paper

  • ...For the typical ratio of transformer no-load losses to load losses it is optimal to choose the transformer size so that the real load of the transformer is within the range of 50%-80% of the transformer nominal load – see [2]....

    [...]

  • ...We have already presented in [2] the first part describing in very detail software features and developed models for VSD with frequency converter....

    [...]

  • ...The efficiency of the induction machine, when it is speed controlled, can be depicted as dependent upon two parameters - motor stator frequency (or if you like synchronous speed) and mechanical (shaft) load [2]....

    [...]