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Pitis C.,Powertech Labs Inc
2016 IEEE Electrical Power and Energy Conference, EPEC 2016 | Year: 2016

Energy conservation measures (ECMs) become a topic of increasing technical and economic importance. The objective is fulfilled by utility and government programs as part of demand-side management (DSM). The programs are designed to achieve corporate objectives by deferring the need for new power generation projects, reducing overall emission of greenhouse gases, improving efficiencies of the equipments and processes. There is a natural tendency of reducing the costs of Energy Studies on Conservation and Energy Efficiency Projects (CEEP) - as part of program expenses, in order to minimize the projects pay-back period. As a result, after CEEP commissioning undesired collateral effects might be present resulting in reduced amount of expected energy savings and sometime even financial losses. Subsequently these may reduce the impact of conservation programs at customer level. The root-cause analyze of such CEEP conducted to conclusion that some of consultants failing to consider a holistic approach methodology. Based on experience resulted from CEEP review activity, the author presents a unified mode of approaching CEEP by using the concept of 5 (five) Essentials of Application Engineering (5EAE). Paper presents fundamentals of new 5EAE concept enabling consultants, designers, manufacturers, and end-users to consistently design and evaluate new projects or retrofits of power converters (PC) and/or any industrial system drives (ISD). Application of 5 EAE concepts is relatively limited on American continent. To date there are no specific references on this subject. The concept is focused on specific ways to think outside the box in designing and/or assessing existent components of ISD. Case studies are used to prove the impact of using 5EAE on CEEP. © 2016 IEEE.


Pitis C.,Powertech Labs Inc
2016 IEEE Electrical Power and Energy Conference, EPEC 2016 | Year: 2016

Some Energy Efficiency Programs (EEP) considers Energy Use Intensity (EUI) as an unreliable indicator due to its variation, i.e. the EUI values are dropping when production increases. Currently used Energy Conservation Measures - ECMs (supported by governmental and utility programs) are proven by energy savings (ES) recorded at revenue meter (or system boundary meter) considering energy use or energy recorded at revenue meter as a whole. The author proposed a novel concept of splitting the energy in 2 (two) specific components: Productive Energy and Non-Productive Energy followed by definition of new EUI type: Productive Energy Use Intensity (PEUI). The concept, applied to metal mines, made a breakthrough in EEP, enabling new ECM types applicable in Mining Industry. Case studies with verification & validation activities are provided. © 2016 IEEE.


News Article | January 11, 2016
Site: www.greencarcongress.com

« New software, electric motors for 2017 Ford Fusion hybrid and plug-in hybrid | Main | Global Bioenergies and Lanzatech strengthen cooperation to broaden feedstock flexibility of renewable isobutene process » British Columbia—based Powertech Labs’ hydrogen fueling station, located onsite at the company’s headquarters, has increased the number of vehicles that it services. The station, the only 70 MPa fast-fill hydrogen fueling station in Canada, currently meets the fueling needs for Mercedes-Benz and Hyundai fuel cell electric vehicles, with a total of 9 vehicles using the station. Since 1 February 2015, the station has dispensed more than 900 kilograms of hydrogen, and has seen more than 500 vehicle fills. Since July 30, as more cars were brought online, usage has more than doubled. Over the past 10 months, the station has had only three days of downtime. Powertech’s station is self-serve with PIN access, and is open Monday to Friday. The station provides electrolyzer-produced hydrogen, and is capable of 70 MPa and 35 MPa dispensing. Since 2001, Powertech has designed and constructed 12 turnkey, compressed hydrogen fueling stations across North America, including one current public retail location and three upcoming public stations in California. Powertech has partnered with a number of companies who were awarded California Energy Commission (CEC) grants by providing the hydrogen fueling station equipment. The stations are designed to fuel 70 MPa fuel cell vehicles in accordance with industry standards as well as next-generation and custom fueling protocols. Powertech was also the first company in North America to get ETL National Fire Protection Association (NFPA) 2 certification for its hydrogen station system. The hydrogen station designs are supported by engineers from Powertech’s high-pressure testing facilities, used to test fuel systems, high-pressure components, and fueling protocols for hydrogen systems. The technical experience gained from testing hydrogen vehicle fuel systems is applied to the design of the hydrogen fueling stations to ensure that Powertech stays on the cutting edge of technology. For continuous improvement, Powertech has access to feedback from three sources: the Testing group, the Fabrication group, and through the operation of its own station. This feedback is utilized to adjust and modify station designs for improved service and reliability. The stations are designed, fabricated, and tested at Powertech’s facility. With the exception of the station at the company headquarters in Surrey, BC, Powertech’s Hydrogen Station business is focused on the sale of turnkey systems. Powertech pioneered the design of turnkey, containerized hydrogen fueling station packages. Other firsts include the world’s first 700 bar fast fill station, first hydrogen station capable of fueling four fuel cell vehicles simultaneously, and first retail-style dispenser. Powertech Labs Inc. is one of the largest testing and research laboratories in North America. Outside of the utilities industry, Powertech provides routine testing capabilities, product development, research and consulting services to support an array of industrial-type operations, electrical equipment manufacturers and automotive original equipment manufacturers.


Wang L.,Powertech Labs Inc
IEEE Power and Energy Society General Meeting | Year: 2012

Transient stability analysis is one of the basic analyses in the planning, design, and operation of power systems. In recent years, one form of this analysis, referred to as on-line Dynamic Security Assessment (DSA), has become increasingly popular as a real-time control center application to monitor, alert, and enhance system security by performing stability analysis using real-time captured system conditions. However, traditional transient stability analysis requires intensive numerical computations and thus usually takes long time to complete. This often makes it a challenge to complete on-line DSA in required cycling time. Improving the speed of transient stability analysis has been the focus of extensive research and development for many years. This paper describes a number of techniques and methods to improve the speed of transient stability analysis. Most of these methods have been practically used with good success to various applications, such as on-line DSA. © 2012 IEEE.


Contin A.,University of Trieste | Zhu H.,Powertech Labs Inc
IEEE Electrical Insulation Magazine | Year: 2011

Dissipation factor (DF) and partial discharge (PD) measurements are the most popular methods used to evaluate the insulation condition of stator bars, coils, and complete windings of rotating machines [1], [2]. However, the relationship between the PD characteristic parameters and DF values has not been well understood [3]-[6]. For example, an increase or decrease in PD values does not always result in a proportional change of DF values [6]. To increase the knowledge base in this topic, this article investigates how PD activity can influence DF values in stator-bar testing. © 2011 IEEE.


Khan M.J.,Powertech Labs Inc | Iqbal M.T.,Memorial University of Newfoundland | Quaicoe J.E.,Memorial University of Newfoundland
IET Renewable Power Generation | Year: 2010

Hydrokinetic energy conversion systems (HECSs) are increasingly being considered as attractive alternative solutions for electric power generation from marine/tidal currents, river streams and other artificial waterways. Use of vertical axis turbines and multi-pole permanent magnet generators (PMGs) are also gaining considerable attention. This work develops a set of dynamic numerical models for vertical axis turbines that employ PMGs for electromechanical energy conversion. Issues such as weak startup behaviour, torque-ripple propagation and system losses are accommodated in the formulations. With emphasis on the electrical and electromechanical subsystems, various key observations have been validated through experiments conducted in a controlled environment. The modelling scheme has been found to be flexible and detailed enough in representing the expected system behaviour. Various limitations and scope of further work are also highlighted in this work. © The Institution of Engineering and Technology 2010.


Zadeh M.R.D.,University of Western Ontario | Sidhu T.S.,University of Western Ontario | Klimek A.,Powertech Labs Inc
IET Generation, Transmission and Distribution | Year: 2011

A directional comparison bus protection can provide a high-speed bus fault clearing in an IEC61850 process-bus environment. This technique is based on fault direction for each circuit connected to the protected bus. Compared to biased current differential protection, the loss of accurate time synchronisation of the individual merging units does not cause the bus protection based on directional comparison to lose security. The suitability of various practical directional techniques is investigated from the viewpoint of directional comparison bus protection for an IEC61850 process bus. A modification in the superimposed directional algorithm for bus protection is proposed to overcome the major problems resulted from breaker operations. As a part of this modification, a new technique is proposed to determine the bus voltage from feeder voltages to avoid the need for an additional three-phase CVT on the bus. PSCAD/EMTDC and MATLAB are utilised to simulate the power system and various directional algorithms, respectively. Results are reported and compared. © 2011 The Institution of Engineering and Technology.


Wang L.,Powertech Labs Inc
Asia-Pacific Power and Energy Engineering Conference, APPEEC | Year: 2011

Dynamic Security Assessment (DSA) is an important way for ensuring the secure and reliable operation of power systems. The current trend is to perform DSA on line using near real-time data. One of the modeling considerations for DSA is special protection systems (SPS). This paper describes a framework that is designed to model SPS for DSA, particularly with respect to on-line applications. It is based on a modular user-defined modeling concept which provides the functionality and flexibility required. This approach is illustrated with practical SPS models and the simulation applications. © 2011 IEEE.


Solak K.,Wroclaw University of Technology | Rebizant W.,Wroclaw University of Technology | Klimek A.,Powertech Labs Inc
IEEE Transactions on Power Delivery | Year: 2012

This paper presents an enhanced current differential protection scheme with fuzzy inference system (FIS) support for high-voltage transmission lines. The proposed adaptive fuzzy scheme combines strengths of current and phase comparison protection criteria. The relay stabilization characteristic is adapted online depending on the output of the fuzzy reasoning scheme supplied with information from the phase comparison unit. The resulting protection is characterized by improved selectivity for external fault cases as well as when nearby transformer inrush currents cause the saturation of current transformers installed in the protected line. The performance of the fuzzy protection scheme has been tested with the signals generated with the use of Alternative Transients Program-Electromagnetic Transients Program and compared to the traditional solutions. © 2012 IEEE.


Tabarraee K.,Powertech Labs Inc | Iyer J.,University of British Columbia | Atighechi H.,University of British Columbia | Jatskevich J.,University of British Columbia
IEEE Transactions on Energy Conversion | Year: 2012

The 120° voltage source inverter driven brushless dc (BLDC) motors are very common in many applications. This paper extends the previous work and presents an improved dynamic average-value model for such BLDC motor-drive systems. The new model is explicit and uses a proper qd model of the permanent magnet synchronous machine with nonsinusoidal rotor flux. The model utilizes multiple reference frame theory to properly include the back EMF harmonics as well as commutation and conduction intervals into the averaged voltage and torque relationships. The commutation angle is readily obtained from the detailed simulation. The proposed model is demonstrated on a typical industrial BLDC motor with trapezoidal back EMF waveforms. The results of studies are compared with experimental measurements as well as previously established models, whereas the new model is shown to provide appreciable improvement. © 2012 IEEE.

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