Pub Date : 1995-11-21DOI: 10.1109/EMPD.1995.500818
Wan-Ki Min, M. Yoo
This paper investigates the usefulness of a novel control method for a HVDC link system which suffers from a severe condition of low order harmonics. This control scheme uses the feedforward control method which is a directly controlled DC current at the DC link system. The studies of this paper are aimed at improving the dynamic response of a HVDC link system in disturbances such as faults. To achieve those objectives, digital time domain simulations are employed by the electromagnetic transient program for a DC system (EMTDC). This method results in stable recovery from faults at both rectifier and inverter terminal busbars for an inherently unstable HVDC system. It has been found to be robust and control performance has been enhanced.
{"title":"High performance control of harmonic instability from HVDC link system","authors":"Wan-Ki Min, M. Yoo","doi":"10.1109/EMPD.1995.500818","DOIUrl":"https://doi.org/10.1109/EMPD.1995.500818","url":null,"abstract":"This paper investigates the usefulness of a novel control method for a HVDC link system which suffers from a severe condition of low order harmonics. This control scheme uses the feedforward control method which is a directly controlled DC current at the DC link system. The studies of this paper are aimed at improving the dynamic response of a HVDC link system in disturbances such as faults. To achieve those objectives, digital time domain simulations are employed by the electromagnetic transient program for a DC system (EMTDC). This method results in stable recovery from faults at both rectifier and inverter terminal busbars for an inherently unstable HVDC system. It has been found to be robust and control performance has been enhanced.","PeriodicalId":447674,"journal":{"name":"Proceedings 1995 International Conference on Energy Management and Power Delivery EMPD '95","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126858935","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1995-11-21DOI: 10.1109/EMPD.1995.500797
S. Kawashima
Modern power systems are so large that it is impossible to design a single central control system that would handle the overall control job. A development of techniques for the design of multivariable control systems is of considerable practical importance. The systems have a great variety of control methods, i.e., fuzzy control, neural control, multichannel control, etc. This paper reports the hierarchy power system's dynamic characteristics, accompanied by the synthesis of the interconnected power system and load frequency control method of weakly decoupling state feedback integrator.
{"title":"Integrator weakly decoupling method applied to power system control","authors":"S. Kawashima","doi":"10.1109/EMPD.1995.500797","DOIUrl":"https://doi.org/10.1109/EMPD.1995.500797","url":null,"abstract":"Modern power systems are so large that it is impossible to design a single central control system that would handle the overall control job. A development of techniques for the design of multivariable control systems is of considerable practical importance. The systems have a great variety of control methods, i.e., fuzzy control, neural control, multichannel control, etc. This paper reports the hierarchy power system's dynamic characteristics, accompanied by the synthesis of the interconnected power system and load frequency control method of weakly decoupling state feedback integrator.","PeriodicalId":447674,"journal":{"name":"Proceedings 1995 International Conference on Energy Management and Power Delivery EMPD '95","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128060099","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1995-11-21DOI: 10.1109/EMPD.1995.500820
Hong-Tzer Yang, Chao-Ming Huang, Huey Min Lee, C. Huang
This paper presents a new fuzzy linear programming (FLP) approach to determine the multiobjective power dispatch problem by taking into account fuel cost and environmental impact of NO/sub x/ emission. The FLP technique first separately optimizes each objective. To further offer the best compromise solution out of the noninferiority domain obtained by the FLP based operator, a preference index of a distance membership function is used to aid the power system operator to adjust the generation levels in a most economic manner but also with minimal impact on the environment. The effectiveness of the proposed approach has been demonstrated on a 10-bus 5-generator system. Numerical results reveal that the FLP is a promising and efficient approach for dealing with the multiobjective nature of the power dispatch problem.
{"title":"Multiobjective power dispatch using fuzzy linear programming","authors":"Hong-Tzer Yang, Chao-Ming Huang, Huey Min Lee, C. Huang","doi":"10.1109/EMPD.1995.500820","DOIUrl":"https://doi.org/10.1109/EMPD.1995.500820","url":null,"abstract":"This paper presents a new fuzzy linear programming (FLP) approach to determine the multiobjective power dispatch problem by taking into account fuel cost and environmental impact of NO/sub x/ emission. The FLP technique first separately optimizes each objective. To further offer the best compromise solution out of the noninferiority domain obtained by the FLP based operator, a preference index of a distance membership function is used to aid the power system operator to adjust the generation levels in a most economic manner but also with minimal impact on the environment. The effectiveness of the proposed approach has been demonstrated on a 10-bus 5-generator system. Numerical results reveal that the FLP is a promising and efficient approach for dealing with the multiobjective nature of the power dispatch problem.","PeriodicalId":447674,"journal":{"name":"Proceedings 1995 International Conference on Energy Management and Power Delivery EMPD '95","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125982835","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1995-11-21DOI: 10.1109/EMPD.1995.500717
R. Billinton, A. Sankarakrishnan, S. Adzanu, J. Satish
A wide range of techniques have been proposed for adequacy evaluation in composite generation and transmission systems. This paper utilizes a test system to illustrate and compare the adequacy indices obtained using an analytical approach and a Monte Carlo simulation method. The paper presents the outage costs at the load buses and for the overall system using the cost of interruption data. The reliability worth implications of nonutility generation (NUG) injected into a composite generation and transmission system are illustrated by application to the test system.
{"title":"Adequacy assessment and worth evaluation and its application to NUG planning in composite generation and transmission systems","authors":"R. Billinton, A. Sankarakrishnan, S. Adzanu, J. Satish","doi":"10.1109/EMPD.1995.500717","DOIUrl":"https://doi.org/10.1109/EMPD.1995.500717","url":null,"abstract":"A wide range of techniques have been proposed for adequacy evaluation in composite generation and transmission systems. This paper utilizes a test system to illustrate and compare the adequacy indices obtained using an analytical approach and a Monte Carlo simulation method. The paper presents the outage costs at the load buses and for the overall system using the cost of interruption data. The reliability worth implications of nonutility generation (NUG) injected into a composite generation and transmission system are illustrated by application to the test system.","PeriodicalId":447674,"journal":{"name":"Proceedings 1995 International Conference on Energy Management and Power Delivery EMPD '95","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130047889","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1995-11-21DOI: 10.1109/EMPD.1995.500777
Cheng-Hong Chang
A Faraday's law machines laboratory for teaching power system and transformers has been implemented. The major goal of this laboratory is to facilitate the experimental studies in a safe, low-cost, and convenient way for our undergraduate students. This article describes the status and future plan of the laboratory. Meanwhile, several illustrative pictures, including laboratory layout, innovative equipment, and example waveforms detected by the laboratory equipment are also reported.
{"title":"The implementation of a Faraday's law machines laboratory for teaching power system and transformers","authors":"Cheng-Hong Chang","doi":"10.1109/EMPD.1995.500777","DOIUrl":"https://doi.org/10.1109/EMPD.1995.500777","url":null,"abstract":"A Faraday's law machines laboratory for teaching power system and transformers has been implemented. The major goal of this laboratory is to facilitate the experimental studies in a safe, low-cost, and convenient way for our undergraduate students. This article describes the status and future plan of the laboratory. Meanwhile, several illustrative pictures, including laboratory layout, innovative equipment, and example waveforms detected by the laboratory equipment are also reported.","PeriodicalId":447674,"journal":{"name":"Proceedings 1995 International Conference on Energy Management and Power Delivery EMPD '95","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130087974","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1995-11-21DOI: 10.1109/EMPD.1995.500723
M. Rahman, R. Shuttleworth
Thermoelectric generators use the Seebeck effect to produce electrical power from a temperature difference caused by heat energy flow. In this paper the principle of using thermoelectrically converted heat energy for powering portable electronic equipment or charging its battery has been investigated for a lap-top computer. The thermoelectric battery charger developed, consists of a thermoelectric converter system, powered from butane gas, and a DC-to-DC boost up converter. Both the sub-assemblies are designed using computer models and constructed. The unit produces an output power of 5 watts which doubles the life of the lap-top computer's internal batteries.
{"title":"Thermoelectric power generation for battery charging","authors":"M. Rahman, R. Shuttleworth","doi":"10.1109/EMPD.1995.500723","DOIUrl":"https://doi.org/10.1109/EMPD.1995.500723","url":null,"abstract":"Thermoelectric generators use the Seebeck effect to produce electrical power from a temperature difference caused by heat energy flow. In this paper the principle of using thermoelectrically converted heat energy for powering portable electronic equipment or charging its battery has been investigated for a lap-top computer. The thermoelectric battery charger developed, consists of a thermoelectric converter system, powered from butane gas, and a DC-to-DC boost up converter. Both the sub-assemblies are designed using computer models and constructed. The unit produces an output power of 5 watts which doubles the life of the lap-top computer's internal batteries.","PeriodicalId":447674,"journal":{"name":"Proceedings 1995 International Conference on Energy Management and Power Delivery EMPD '95","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134571787","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1995-11-21DOI: 10.1109/EMPD.1995.500780
Wei Jing-Yuan, Y. Smeers, E. Canon
An integrated market organized by regulated electric utilities is modelled. It is assumed that, given a price vector for the exchange of electricity between each pair of neighboring utilities, utilities independently maximize their own domestic social welfare subject to the zero profit constraint. An equilibrium price vector for exchanges among utilities is defined as the one which clears the exchanges for all pair of business partners. A single piecewise linear model is formulated for computing market equilibria. The model is used to simulate the electricity supply market organised by 11 western European countries.
{"title":"A bargaining model of regulated markets' integration with an application to electricity supply market","authors":"Wei Jing-Yuan, Y. Smeers, E. Canon","doi":"10.1109/EMPD.1995.500780","DOIUrl":"https://doi.org/10.1109/EMPD.1995.500780","url":null,"abstract":"An integrated market organized by regulated electric utilities is modelled. It is assumed that, given a price vector for the exchange of electricity between each pair of neighboring utilities, utilities independently maximize their own domestic social welfare subject to the zero profit constraint. An equilibrium price vector for exchanges among utilities is defined as the one which clears the exchanges for all pair of business partners. A single piecewise linear model is formulated for computing market equilibria. The model is used to simulate the electricity supply market organised by 11 western European countries.","PeriodicalId":447674,"journal":{"name":"Proceedings 1995 International Conference on Energy Management and Power Delivery EMPD '95","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134355938","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1995-11-21DOI: 10.1109/EMPD.1995.500728
R. Oruganti, K. Nagaswamy, Lock Kai Sang
A new constant switching frequency control method for single phase boost type AC-DC converters is presented. The duty cycle of operation of the converter switches in each switching period is determined such that the input average current tracks the reference template in a cycle by cycle fashion. The problems encountered in achieving smooth and stable operation and the modifications made to overcome them are discussed. The simulation studies done on the converter controlled with this method which is given the name Predicted (on-time) Equal Charge Criterion (PECC) indicate stable operation. The control complexity in this method is offset by advantages like simplified filter design, and the ability to operate under different power factors and input current levels. The proposed method is also expected to be applicable for three phase converters.
{"title":"A constant frequency variable power factor PWM scheme for single phase boost type AC-DC converter","authors":"R. Oruganti, K. Nagaswamy, Lock Kai Sang","doi":"10.1109/EMPD.1995.500728","DOIUrl":"https://doi.org/10.1109/EMPD.1995.500728","url":null,"abstract":"A new constant switching frequency control method for single phase boost type AC-DC converters is presented. The duty cycle of operation of the converter switches in each switching period is determined such that the input average current tracks the reference template in a cycle by cycle fashion. The problems encountered in achieving smooth and stable operation and the modifications made to overcome them are discussed. The simulation studies done on the converter controlled with this method which is given the name Predicted (on-time) Equal Charge Criterion (PECC) indicate stable operation. The control complexity in this method is offset by advantages like simplified filter design, and the ability to operate under different power factors and input current levels. The proposed method is also expected to be applicable for three phase converters.","PeriodicalId":447674,"journal":{"name":"Proceedings 1995 International Conference on Energy Management and Power Delivery EMPD '95","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130364956","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1995-11-21DOI: 10.1109/EMPD.1995.500693
K. Okada, H. Asano
This paper presents a multi-area economic load dispatching control (EDC) with a combination of spot pricing as a demand side option and economic power interchange as a supply side option to keep demand and supply balance. The effectiveness of the proposed method is illustrated by numerical simulations using a test power system model that has three regions.
{"title":"A multi-area EDC with spot pricing and economic power interchange","authors":"K. Okada, H. Asano","doi":"10.1109/EMPD.1995.500693","DOIUrl":"https://doi.org/10.1109/EMPD.1995.500693","url":null,"abstract":"This paper presents a multi-area economic load dispatching control (EDC) with a combination of spot pricing as a demand side option and economic power interchange as a supply side option to keep demand and supply balance. The effectiveness of the proposed method is illustrated by numerical simulations using a test power system model that has three regions.","PeriodicalId":447674,"journal":{"name":"Proceedings 1995 International Conference on Energy Management and Power Delivery EMPD '95","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131491479","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1995-11-21DOI: 10.1109/EMPD.1995.500725
W. Lawrance, G. Michalik, W. Mielczarski, J. Szczepanik
The paper presents two new schemes of harmonic current reduction in distribution circuits. The first scheme aims at the reduction of harmonics generated by six pulse bridge rectifiers which are common nonlinear loads in industry. The new approach is based on injection of the third harmonic current into the transformer secondary. The current injected is generated in two passive filters connected between the outputs of the bridge and the common point of transformer secondary. The scheme is very effective, reducing harmonic distortion in the supply current from 27% to 4-5%. The second scheme presented aims at the reduction of harmonic distortion caused by fluorescent lamp systems. It assumes the installation of a series filter in the neutral conductor. A specially designed filter provides a low impedance path for the first harmonic current and high impedance for higher harmonics. Simulation and laboratory tests show significant reduction of harmonics in the neutral and phase conductors.
{"title":"Reduction of harmonic pollution in distribution networks","authors":"W. Lawrance, G. Michalik, W. Mielczarski, J. Szczepanik","doi":"10.1109/EMPD.1995.500725","DOIUrl":"https://doi.org/10.1109/EMPD.1995.500725","url":null,"abstract":"The paper presents two new schemes of harmonic current reduction in distribution circuits. The first scheme aims at the reduction of harmonics generated by six pulse bridge rectifiers which are common nonlinear loads in industry. The new approach is based on injection of the third harmonic current into the transformer secondary. The current injected is generated in two passive filters connected between the outputs of the bridge and the common point of transformer secondary. The scheme is very effective, reducing harmonic distortion in the supply current from 27% to 4-5%. The second scheme presented aims at the reduction of harmonic distortion caused by fluorescent lamp systems. It assumes the installation of a series filter in the neutral conductor. A specially designed filter provides a low impedance path for the first harmonic current and high impedance for higher harmonics. Simulation and laboratory tests show significant reduction of harmonics in the neutral and phase conductors.","PeriodicalId":447674,"journal":{"name":"Proceedings 1995 International Conference on Energy Management and Power Delivery EMPD '95","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129077838","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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