© Copyright 2009 The IEEE 10th Annual Electrical Power & Energy Conference 2010
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The Hydro Turbine Governor - and Why it is Important to Understand it
John Codrington, P. Eng.
Hatch Inc., Niagara Falls, Ontario (www.hatch.ca)
An overview of the hydro turbine governor will be given. The idea of the governor was first treated analytically by Clark Maxwell in the 19th century. Governor action was correctly seen as something very important in the days when hydro plants were installed as the sole or the principal contributor to a small power system. As large interconnected systems developed, the large number of loads and generators obscured the action of the governor. Less interest was taken in how the governor should be specified and adjusted for use in a large interconnected system. However, mysterious power flows began to be seen in generation areas where the generation was predominantly hydro. This led to governor setting policies, which are valid today.
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Power Quality: Definition, aspects, problems and solutions
Dr. Walid G. Morsi, University of New Brunswick
Fredericton, New Brunswick
The subject of the electric power quality has gained attention in the last decade as the electric power system is undergoing deregulation and with the introduction of the concept of the smart grid with either renewable-based or non-renewable based distributed generation. Due to the increased use of power electronic based devices and other nonlinear loads, the quality of the electric power delivered to consumers can deteriorate leading to economical impacts and many operational problems.
Read More
Design Issues and Practical Solutions for Electric and Hybrid Electric Vehicle Propulsion Systems
Tanvir Rahman, Member, IEEE, and Sheldon S. Williamson, Member, IEEE
Plug-in hybrid electric vehicles (PHEVs) and electric vehicles (EVs) are generally regarded as the future for a sustainable automobile industry. Encompassing sufficient energy storage on-board is one of the major hurdles, delaying the proliferation of EVs in the commercial market. Hence, there is a need to build more efficient, light weight, and compact electric propulsion systems, so as to maximize driving range per charge. Primarily, there exist two methods to achieve high power density as well as high efficiency drives. One method includes employing high-speed motors, so that the motor volume and weight are greatly reduced at the same rated output power. However, mechanical losses are incurred by the clutch, reduction gear, and differential gear, during power
transmission from the motor to the wheels. An alternate method involves using high-torque low-speed motors, which can be directly mounted inside the wheel, known as “wheel motor” or “hub motor.
Read More
John Codrington, P. Eng.
Hatch Inc., Niagara Falls, Ontario (www.hatch.ca)
An overview of the hydro turbine governor will be given. The idea of the governor was first treated analytically by Clark Maxwell in the 19th century. Governor action was correctly seen as something very important in the days when hydro plants were installed as the sole or the principal contributor to a small power system. As large interconnected systems developed, the large number of loads and generators obscured the action of the governor. Less interest was taken in how the governor should be specified and adjusted for use in a large interconnected system. However, mysterious power flows began to be seen in generation areas where the generation was predominantly hydro. This led to governor setting policies, which are valid today.
Read More
Power Quality: Definition, aspects, problems and solutions
Dr. Walid G. Morsi, University of New Brunswick
Fredericton, New Brunswick
The subject of the electric power quality has gained attention in the last decade as the electric power system is undergoing deregulation and with the introduction of the concept of the smart grid with either renewable-based or non-renewable based distributed generation. Due to the increased use of power electronic based devices and other nonlinear loads, the quality of the electric power delivered to consumers can deteriorate leading to economical impacts and many operational problems.
Read More
Design Issues and Practical Solutions for Electric and Hybrid Electric Vehicle Propulsion Systems
Tanvir Rahman, Member, IEEE, and Sheldon S. Williamson, Member, IEEE
Plug-in hybrid electric vehicles (PHEVs) and electric vehicles (EVs) are generally regarded as the future for a sustainable automobile industry. Encompassing sufficient energy storage on-board is one of the major hurdles, delaying the proliferation of EVs in the commercial market. Hence, there is a need to build more efficient, light weight, and compact electric propulsion systems, so as to maximize driving range per charge. Primarily, there exist two methods to achieve high power density as well as high efficiency drives. One method includes employing high-speed motors, so that the motor volume and weight are greatly reduced at the same rated output power. However, mechanical losses are incurred by the clutch, reduction gear, and differential gear, during power
transmission from the motor to the wheels. An alternate method involves using high-torque low-speed motors, which can be directly mounted inside the wheel, known as “wheel motor” or “hub motor.
Read More