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G. J. Berg

Bio: G. J. Berg is an academic researcher from University of Calgary. The author has contributed to research in topics: Induction motor & Electric power system. The author has an hindex of 13, co-authored 32 publications receiving 586 citations.

Papers
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Journal ArticleDOI
TL;DR: In this paper, the steady state analysis of self-excited induction generators using balanced terminal capacitors is presented, where both operational and steady state equivalent circuits of the induction machine are employed to predict the steady-state performance under different load conditions.
Abstract: The paper presents a method for the steady state analysis of self-excited induction generators using balanced terminal capacitors. Operational and steady state equivalent circuits of the induction machine are employed to predict the steady state performance under different load conditions. The analytical procedure and the related computer program is described in the paper. Simulated results are presented and compared with corresponding results obtained experimentally.

185 citations

Journal ArticleDOI
TL;DR: In this article, the problem of solving the general three-phase induction motor performance equations is discussed and methods of digital solution for both the threephase motor and the two-axis model are described.
Abstract: The problem of solving the general three-phase induction motor performance equations is discussed and methods of digital solution for both the three-phase motor and the two-axis model are described.

69 citations

Journal ArticleDOI
TL;DR: In this article, a method of simulating single and multiple transmission element (line and transformer) outages is discussed, where sensitivity relationships of power systems are used both to determine the required power injections into the end buses and to determine corresponding corrections to the phase angles and magnitudes of bus voltages.
Abstract: A method of simulating single and multiple transmission element (line and transformer) outages is discussed in the paper. The method simulates the outaged system states assuming the scheduled demands of the end buses of the outaged elements are still met. Sensitivity relationships of power systems are used both to determine the required power injections into the end buses, and to determine the corresponding corrections to the phase angles and magnitudes of bus voltages. The proposed method has been applied to the 30-bus and 118-bus IEEE standard test systems. Relevant results are presented and discussed.

42 citations

Journal ArticleDOI
TL;DR: In this article, the problem of simulating the transient performance of three-phase induction motors is discussed and a method of solution by digital simulation using phase variables has been developed and is presented.
Abstract: The problem of simulating the transient performance of thyristor controlled three-phase induction motors is discussed. A method of solution by digital simulation using phase variables has been developed and is presented. The method enables transient current, speed, and electromagnetic torque patterns to be predicted for run-up conditions and conditions of operating mode transition. Application of the method is illustrated and sample results are presented and discussed.

36 citations

Journal ArticleDOI
TL;DR: In this paper, an effective braking system suitable for three-phase induction motor drives is discussed, where a single capacitor is connected across two of the motor terminals allowing single-phase self-excitation.
Abstract: An effective braking system suitable for three-phase induction motor drives is discussed. Braking is achieved in four stages using an electronic switching circuit. Initially, a single capacitor is connected across two of the motor terminals allowing single-phase self-excitation. Following a certain speed drop, a second capacitor is added across the same terminals to sustain self-excitation and reduce the speed further. In the third stage magnetic braking is achieved by short circuiting the third terminal. Finally, the motor is brought to a standstill by dc injection. A method of determining minimum capacitor requirements is presented for both single-phase and symmetrical application. Experimental results are included, demonstrating the validity of theoretical results regarding capacitor requirements, and indicating the effectiveness of the proposed braking scheme.

36 citations


Cited by
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Journal ArticleDOI
H. Li1, Zhe Chen1
TL;DR: An overview of different wind generator systems and their comparisons are presented in this article, where the quantitative comparison and market penetration of different WG systems are presented. And the developing trends of wind generator system and appropriate comparison criteria are discussed.
Abstract: With rapid development of wind power technologies and significant growth of wind power capacity installed worldwide, various wind turbine concepts have been developed. The wind energy conversion system is demanded to be more cost-competitive, so that comparisons of different wind generator systems are necessary. An overview of different wind generator systems and their comparisons are presented. First, the contemporary wind turbines are classified with respect to both their control features and drive train types, and their strengths and weaknesses are described. The promising permanent magnet generator types are also investigated. Then, the quantitative comparison and market penetration of different wind generator systems are presented. Finally, the developing trends of wind generator systems and appropriate comparison criteria are discussed. It is shown that variable speed concepts with power electronics will continue to dominate and be very promising technologies for large wind farms. The future success of different wind turbine concepts may strongly depend on their ability of complying with both market expectations and the requirements of grid utility companies.

1,023 citations

Journal ArticleDOI
TL;DR: In this article, a survey of papers and reports that address various aspects of economic dispatch is presented, including optimal power flow, economic dispatch in relation to AGC, dynamic dispatch, and economic dispatch with nonconventional generation sources.
Abstract: A survey is presented of papers and reports that address various aspects of economic dispatch. The time period considered is 1977-88. Four related areas of economic dispatch are identified and papers published in the general areas of economic dispatch are classified into these. These areas are: optimal power flow, economic dispatch in relation to AGC, dynamic dispatch, and economic dispatch with nonconventional generation sources. >

587 citations

Journal ArticleDOI
TL;DR: In this paper, the authors present a bibliography of papers on the subject of power system reliability evaluation, which includes material which has become available since the publication of the four previous papers.
Abstract: This paper presents a bibliography of papers on the subject of power system reliability evaluation. Papers in such areas as: probabilistic load flow, probabilistic production costing, probabilistic transient stability evaluation, etc. have not been included except where they specifically address power system reliability evaluation. It includes material which has become available since the publication of the four previous papers. 'Bibliography on the Application of Probability Methods in Power System Reliability Evaluation', IEEE Trans. On Power Apparatus and Systems PAS-91, 1972, p.649-660; PAS-97, 1978, p.2235-2242; PAS-103, 1984, p.275-282 and IEEE Trans. On Power Systems, vol.3, no.4,p.1555-1564, 1984. The authors have endeavored to include papers which are readily archival on an international basis. Consequently, the proceedings of such conferences as: CIGRE, Inter-RAM, PMAPS, etc. are regretfully not included. Due to space constraints, only papers written in English were considered for inclusion in this bibliography. >

534 citations

Journal ArticleDOI
TL;DR: A survey of the literature over the past 25 years discussing the process of self-excitation and voltage buildup, modeling, steady-state, and transient analysis, reactive power control methods, and parallel operation of SEIGs is presented in this article.
Abstract: Induction generators are increasingly being used in nonconventional energy systems such as wind, micro/mini hydro, etc. The advantages of using an induction generator instead of a synchronous generator are well known. Some of them are reduced unit cost and size, ruggedness, brushless (in squirrel cage construction), absence of separate dc source, ease of maintenance, self-protection against severe overloads and short circuits, etc. In isolated systems, squirrel cage induction generators with capacitor excitation, known as self-excited induction generators (SEIGs), are very popular. This paper presents an exhaustive survey of the literature over the past 25 years discussing the process of self-excitation and voltage buildup, modeling, steady-state, and transient analysis, reactive power control methods, and parallel operation of SEIG.

463 citations