Pub Date : 1995-11-21DOI: 10.1109/EMPD.1995.500771
S. Tso, S. P. Cheung
Recent developments in transient stability margin (TSM) prediction using the energy-based direct method have included excitation controllers, power system stabilizers (PSSs) and/or static VAr compensators (SVCs). These devices can be represented in their detailed dynamic models to desired degrees of complexity while the proposed "extended" equal-area criterion can still be effectively applied. This paper describes further development of this technique to incorporate an HVDC transmission into the test network for TSM prediction. The method is examined with a practical 17-machine power network representing the South China/Hong Kong system. An SVC control scheme is also installed in a weak bus of the test network for transient stability improvement. The results obtained show that there is no sacrifice in accuracy, speed or reliability of the TSM method with SVC and HVDC realistically incorporated into the study.
{"title":"Fast prediction of transient stability margin in systems with SVC control and HVDC link","authors":"S. Tso, S. P. Cheung","doi":"10.1109/EMPD.1995.500771","DOIUrl":"https://doi.org/10.1109/EMPD.1995.500771","url":null,"abstract":"Recent developments in transient stability margin (TSM) prediction using the energy-based direct method have included excitation controllers, power system stabilizers (PSSs) and/or static VAr compensators (SVCs). These devices can be represented in their detailed dynamic models to desired degrees of complexity while the proposed \"extended\" equal-area criterion can still be effectively applied. This paper describes further development of this technique to incorporate an HVDC transmission into the test network for TSM prediction. The method is examined with a practical 17-machine power network representing the South China/Hong Kong system. An SVC control scheme is also installed in a weak bus of the test network for transient stability improvement. The results obtained show that there is no sacrifice in accuracy, speed or reliability of the TSM method with SVC and HVDC realistically incorporated into the study.","PeriodicalId":447674,"journal":{"name":"Proceedings 1995 International Conference on Energy Management and Power Delivery EMPD '95","volume":"9 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":"130738810","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.1995.500818
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.1995.500773
Y. Tan, Youyi Wang
A power system is a typical example of a nonlinear system. Its nonlinearity is amplified following a severe disturbance and it precludes the use of classical linear control techniques. In this paper, an adaptive nonlinear excitation and static phase shifter (SPS) controller is proposed to enhance the transient stability of a power system. The authors' simulation results demonstrate that the proposed controller can ensure the transient stability of a power system under a large sudden fault which may occur at the generator bus terminal.
{"title":"Transient stability improvement of power systems using nonlinear excitation, phase shifter and adaptive control law","authors":"Y. Tan, Youyi Wang","doi":"10.1109/EMPD.1995.500773","DOIUrl":"https://doi.org/10.1109/EMPD.1995.500773","url":null,"abstract":"A power system is a typical example of a nonlinear system. Its nonlinearity is amplified following a severe disturbance and it precludes the use of classical linear control techniques. In this paper, an adaptive nonlinear excitation and static phase shifter (SPS) controller is proposed to enhance the transient stability of a power system. The authors' simulation results demonstrate that the proposed controller can ensure the transient stability of a power system under a large sudden fault which may occur at the generator bus terminal.","PeriodicalId":447674,"journal":{"name":"Proceedings 1995 International Conference on Energy Management and Power Delivery EMPD '95","volume":"92 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":"122115533","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}
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.1995.500751
S. Tso, T. Zhu, Q. Zeng, K. L. Lo
This paper presents a physical simulation of the dynamic behaviour of voltage instability in an interconnected multimachine power system environment. The dynamic evolving process leading to eventual voltage collapse, the scenario of the progressive reactive support reduction resulting from the MXL protection relays, the OLTC operation, and the effect of switched-in capacitor banks are examined using physical facilities in the laboratory. The physical simulation results are also compared with digital simulation results. This physical investigation provides a reliable foundation for the effective development of assessment approaches and countermeasures.
{"title":"Physical simulation study of dynamic voltage instability [in power systems]","authors":"S. Tso, T. Zhu, Q. Zeng, K. L. Lo","doi":"10.1109/EMPD.1995.500751","DOIUrl":"https://doi.org/10.1109/EMPD.1995.500751","url":null,"abstract":"This paper presents a physical simulation of the dynamic behaviour of voltage instability in an interconnected multimachine power system environment. The dynamic evolving process leading to eventual voltage collapse, the scenario of the progressive reactive support reduction resulting from the MXL protection relays, the OLTC operation, and the effect of switched-in capacitor banks are examined using physical facilities in the laboratory. The physical simulation results are also compared with digital simulation results. This physical investigation provides a reliable foundation for the effective development of assessment approaches and countermeasures.","PeriodicalId":447674,"journal":{"name":"Proceedings 1995 International Conference on Energy Management and Power Delivery EMPD '95","volume":"66 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":"123126018","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.1995.500731
A. Nikander, E. Lakervi, J. Suontausta
The treatment of the neutral of a medium voltage power system has a major influence on the system behaviour. Earth faults in isolated and compensated power systems are simulated. The results contribute to various developments for improved power system protection. Conditions in radially operated rural 20 kV overhead distribution networks are considered.
{"title":"Applications of transient phenomena during earth-faults in electricity distribution networks","authors":"A. Nikander, E. Lakervi, J. Suontausta","doi":"10.1109/EMPD.1995.500731","DOIUrl":"https://doi.org/10.1109/EMPD.1995.500731","url":null,"abstract":"The treatment of the neutral of a medium voltage power system has a major influence on the system behaviour. Earth faults in isolated and compensated power systems are simulated. The results contribute to various developments for improved power system protection. Conditions in radially operated rural 20 kV overhead distribution networks are considered.","PeriodicalId":447674,"journal":{"name":"Proceedings 1995 International Conference on Energy Management and Power Delivery EMPD '95","volume":"420 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":"129383133","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.1995.500728
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}
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