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Toronto, Canada

Hydro One Incorporated delivers electricity across the Canadian province of Ontario. It is a corporation established under the Business Corporations Act with a single shareholder, the Government of Ontario.Hydro One traces its history to the early 20th century to the establishment of the Hydro-Electric Power Commission of Ontario, renamed "Ontario Hydro" in 1974.In October 1998, the provincial government passed the "Energy Competition Act" which restructured Ontario Hydro with the aim of privatizing all electrical generating and transmission/delivery. Wikipedia.

Hamoud G.A.,Hydro One Inc
IEEE Transactions on Power Systems | Year: 2011

This paper describes a probabilistic method for determining the number of spare transformers (regular spare transformers and mobile unit substations) required for a group of distribution transformers in order to meet a predetermined level of the group availability. The method is based on a Markov model and accounts for a number of factors that affect the number of spare units. The factors include the use of both regular spare transformers (RSTs) and mobile unit substations (MUSs), type of transformer failure and the various parameters of regular transformers, and spare transformers. Sensitivity analysis is performed to determine the factors that affect most the number of spare units. The proposed method is illustrated using a sample system of the Hydro One's distribution stations. © 2010 IEEE. Source

Atwa Y.M.,University of Waterloo | El-Saadany E.F.,University of Waterloo | Salama M.M.A.,University of Waterloo | Seethapathy R.,Hydro One Inc
IEEE Transactions on Power Systems | Year: 2010

It is widely accepted that renewable energy sources are the key to a sustainable energy supply infrastructure since they are both inexhaustible and nonpolluting. A number of renewable energy technologies are now commercially available, the most notable being wind power, photovoltaic, solar thermal systems, biomass, and various forms of hydraulic power. In this paper, a methodology has been proposed for optimally allocating different types of renewable distributed generation (DG) units in the distribution system so as to minimize annual energy loss. The methodology is based on generating a probabilistic generation-load model that combines all possible operating conditions of the renewable DG units with their probabilities, hence accommodating this model in a deterministic planning problem. The planning problem is formulated as mixed integer nonlinear programming (MINLP), with an objective function for minimizing the system's annual energy losses. The constraints include the voltage limits, the feeders' capacity, the maximum penetration limit, and the discrete size of the available DG units. This proposed technique has been applied to a typical rural distribution system with different scenarios, including all possible combinations of the renewable DG units. The results show that a significant reduction in annual energy losses is achieved for all the proposed scenarios. © 2009 IEEE. Source

Hamoud G.A.,Hydro One Inc
IEEE Transactions on Power Systems | Year: 2013

This paper describes a probabilistic method based on a total risk index (probability times consequences) for assessing the number of spare breakers required for a group of similar high voltage breakers used in switching and transformer stations. The proposed method uses a Markov model for assessing the probability of failures and a bulk power system reliability program for evaluating failure consequences. The method considers a number of factors such as the group size, unit failure rate, unit repair time, transmission station layout, and other power system parameters that may impact the number of spare breakers. A cost/benefit analysis approach is used in determining the required number of spare breakers. The number of spare units is determined when the total cost (sum of spare unit costs, system operating costs and system outage costs due to breaker failures) is minimum. An example is given to illustrate the proposed method of assessment. © 2013 IEEE. Source

Moharana A.,University of Western Ontario | Varma R.K.,University of Western Ontario | Seethapathy R.,Hydro One Inc
IEEE Transactions on Sustainable Energy | Year: 2014

In this paper, a static synchronous compensator (STATCOM) with a voltage controller is proposed to mitigate the potential of sub synchronous resonance (SSR) in a series compensated induction-generator (IG)-based wind farm. Detailed eigenvalue analysis is performed to demonstrate that IG effect SSR is successfully alleviated by STATCOM. The results are validated through electromagnetic transient simulation with PSCAD/EMTDC. The impacts of symmetrical fault at different locations and collector cables are investigated, and the effectiveness of the proposed STATCOM controller is illustrated. It is shown that a three-phase fault close to the wind farm may cause severe oscillations in the point of common coupling (PCC) voltage, electromagnetic torque, and shaft torque of the wind turbine generator. To examine this situation, an equivalent circuit analysis is presented, which predicts the band of resonant speeds within which the wind turbine becomes unstable. The study is extended to other commercially available IGs, which also show the potential for SSR even at realistic levels of series compensation levels, and the capability of the proposed STATCOM controller to obviate its occurrence. © 2010-2012 IEEE. Source

Ceja-Gomez F.,SNC - Lavalin | Qadri S.S.,Hydro One Inc | Galiana F.D.,McGill University
IEEE Transactions on Power Systems | Year: 2012

We propose and test a new systematic approach to set load shedding under-frequency relays that replaces much of the conventional simulation-based trial-and-error heuristics by a mixed-integer linear program that can then be solved by commercially available highly efficient solvers such as CPLEX. The new formulation can account for an arbitrary number of random generator outages and for the particularities of the power system such as inertia, damping and regulation parameters, and under-frequency/time limitations. The under-frequency relays are characterized by a sequence of frequency set points and allowed time spans below such levels together with the amount of load shedding needed to meet all specified time and frequency criteria. The objective function is to minimize the average amount of load shed over a set of random generator outages. Two simulation studies are presented to illustrate the use of the proposed method to obtain suitable relay settings. © 2012 IEEE. Source

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