Program Topic: Transmission Apparatus

F1-2Friday 08:20-09:40

08:20 Efficient Rectenna with Wide Dynamic Input Power Range for 900 MHz Wireless Power Transfer Applications

Abdullah Almohaimeed (University of Ottawa, Canada); Mustapha Yagoub (University of Ottawa, Canada); Rony Amaya (Carleton University, Canada)

This work demonstrates the design of a rectenna to operate over wide dynamic input power range. It utilizes an adaptive reconfigurable rectifier to overcome the issue of early breakdown voltage in conventional rectifiers. A depletion-mode field-effect transistor has been introduced to operate as a switch and compensate at low and high input power levels for the rectifier. In addition, a meandered monopole antenna has been exploited to collect RF energy. The rectifier design achieves 40% of RF-DC power conversion efficiency over a wide dynamic input power range from -17 dBm to 27 dBm and the antenna exhibits a directivity of 1.92 dBi as well as a return loss of -33 dB. The rectenna is designed to operate in the 900 MHz ISM band and suitable for Wireless Power Transfer (WPT) applications.

08:40 Assessment of a Self-Sustaining Fuel Cycle Option for a Pressure-Tube Heavy Water Nuclear Reactor

Sourena Golesorkhi (Canadian Nuclear Laboratories, Canada); Blair Bromley (Canadian Nuclear Laboratories, Canada); Ashlea Colton (Canadian Nuclear Laboratories, Canada); Matthew Kaye (University of Ontario Institute of Technology, Canada)

Nuclear power is an efficient, low-carbon foundation for baseload electricity generation. The pressure tube heavy water reactor (PT-HWR) is a proven design with extensive operational experience and has great fuel cycle flexibility. Thorium is an abundant fuel source which has not yet been commercially exploited. This work aims to develop reactor physics models of PT-HWR cores on self-sustaining thorium fuel cycles, in which as much fuel is produced as consumed. While the final result is not entirely self-sustaining, it produces 99.06% of the fuel consumed. In addition, this concept can produce 10% more power than standard reactors of this type, while maintaining adherence with regulatory safety limits. Options for future work, including makeup fuel from a coupled reactor, are discussed.

09:00 Uncertainty Modeling in Transmission Underground Cable Asset Renewal Projects

Kings Wong (Hydro One Networks Inc., Canada)

In many power transmission utility companies in North America, there is a large number of underground transmission circuits that are approaching their physical end-of life and will require significant refurbishment work or their outright replacement within the next five to ten years. The evaluation and prioritization of these asset renewal projects is a complex task and involves the consideration of many different areas such as current asset conditions, risk analysis, financial evaluations, system reliability, etc. [1] The implementation of these underground transmission asset renewal projects also contains many uncertainties and risks related to the financial costs, project timing, real estate and environmental issues which are often difficult to assess in the utility company at the project’s initiation stage. This paper discusses the common risks and uncertainties associated in particular with underground transmission cable asset renewal projects. The use of the possibility method for modeling the uncertainties associated with transmission cable asset renewal projects to aid in the assessment and prioritization of the asset renewal projects is also discussed.

09:20 Optimal Harmonic Filter Topology Applied in HV and EHV Networks Using Particle Swarm Optimization

Reynaldo Ramos (The University of Alabama at Birmingham, USA); Gregory Franklin (The University of Alabama at Birmingham, USA)

Passive shunt harmonic filter banks have proven to be an effective method for reducing harmonic distortion in HV and EHV networks, while providing the necessary volt-ampere-reactive power support and voltage support. Previous work in this area has provided information regarding the design and application of harmonic filters as well as discussion of the different filter topologies that are typically employed. However, there is a lack of information in the area of optimal filter sizing and topology selection when the power system is networked. In this paper, a novel approach is presented to optimally solve the filter sizing and topology selection problem using the Particle Swarm Optimization algorithm. The proposed approach is based on the minimization of a multi-objective optimization function while considering the effects of existing shunt capacitor banks and network topology changes. The effectiveness of the proposed method is shown via a numerical example. Simulation results demonstrate the superior performance of the C-Type harmonic filter bank.

F4-2Friday 15:20-17:00

15:20 Power Quality Improvement in Induction Furnace Using Eleven Level Cascaded Inverter Based DSTATCOM

Tejinder Saggu (PEC University of Technology, India); Lakhwinder Singh (Baba Banda Singh Bahadur Engineering College, India); Bob Gill (British Columbia Institute of Technology, Canada)

In power distribution networks, the use of non-linear loads is expanding day by day due to which the power quality of the system is being deteriorated. An induction furnace is one such typical example of a non-linear load which is indispensable component of the steel industries. It injects considerable amount of harmonics into the supply network and consequently the performance of other loads in its vicinity gets affected. In this paper, the application of an eleven level Cascaded Multilevel Inverter (CMLI) based Distribution Static Compensator (DSTATCOM) is presented to improve the power quality of an induction furnace in a steel industry. The experimental readings of the induction furnace are obtained using power quality analyser and then an equivalent model of this induction furnace has been developed in Matlab Simulink platform using real world industrial data. The solution methodology proposed by CMLI based DSTATCOM reveals the effectiveness of proposed control strategy for voltage sag mitigation and Total Harmonic Distortion (THD) improvement of both load current and voltage as per the IEEE standards.

15:40 A Negative-Sequence Based Method for Fault Passage Identification

Alexandre Nassif (ATCO Electric, Canada); Robby Gill (ATCO Electric, Canada); Christopher Loo (ATCO Electric, Canada); Eric (Peng) Ge (ATCO Electric, Canada)

Reliable fault indication is crucial in any distribution feeder management system. A distribution line protective device can use different algorithms to detect whether or not it is in the fault path. When the downstream fault involves all three phases, detection is typically easy to achieve and phase elements are sufficient. Single line to ground faults cannot always be treated in the same manner, as ground sources are prevalent throughout the grid. In these cases, directionality (achieved by voltage polarization) is required. However, the requirement of both current and voltage measurements could render the solution cost prohibitive. If voltage is not available, detection may fail. Hence, there is the need for a simple but reliable ground fault indicator which is based on current measurements solely. This paper proposes the use of negative-sequence current to achieve this purpose. It is inspired by the fact that there is only one source of negative-sequence currents in a radial system. The proposed settings were implemented in large scale in the city of Fort McMurray throughout ATCO Electric’s DSCADA devices. Such inputs are used by the feeder automation system to reconfigure the system automatically in case of permanent outages.

16:00 Accelerating Renewable Connections Through Coupling Demand and Distributed Generation

Milana Plecas (University of Strathclyde, United Kingdom); Simon Gill (University of Strathclyde, United Kingdom); Ivana Kockar (University of Strathclyde, United Kingdom)

The objective of this paper is to investigate the options for using local demand to accelerate the connection of renewable Distributed Generation (DG) capacity. It presents a range of architectures for operating Distributed Energy Systems (DESs) that contain local demand and distributed generation. The concept of a DES is that demand is supplied by local DG either using privately owned distribution assets or a public distribution network owned by a Distribution Network Operator (DNO). Operation of a DES can help manage variability in DG output, reduce curtailment in Active Network Management (ANM) schemes, and assist the DNO in managing network constraints. They also provide a move towards local trading of electricity with potential financial and non-financial benefits to both distributed generators and local demand customers.

16:20 Multi-Objective Optimization for Voltage Regulation in Distribution Systems with Distributed Generators

Vahid Asgharian (Istanbul Technical University, Turkey); V. M. Istemihan Genc (Istanbul Technical University, Turkey)

In this study, in order to reduce the abnormal voltage drop or rise in the distribution systems with distributed generators, we consider a multi-objective function to be optimized in such a way that the voltage profile is enhanced while the total active power loss in the network is minimized under some operational constraints. Capacitors and static VAR compensator are also coordinated with the distributed generators in the network to acquire a better enhancement in the voltage profile. The purpose of this study is to obtain the optimum sizes and locations of these system components so that the active power losses and the deviations in bus voltages from their nominal values are minimized. The problem is formulated as a multi-objective optimization problem and solved by the goal attainment method. The studies are demonstrated on an IEEE 34-bus test system where the direct load flow method is utilized for load flow calculations.

16:40 Research on Dynamic Frequency Bias Coefficient and Relevant Evaluation Criterion in the Setting of UHV

Xingyu Liu (China Three Gorges University, P.R. China); Yunhai Zhou (China Three Gorges University, P.R. China); Hang Dong (Tsinghua University, P.R. China); Xianzhaung Liu (Tsinghua Uninversity, P.R. China); Wei Xu (Centre China Grid Company Limited, P.R. China); Faqi Yan (Centre China Grid Company Limited, P.R. China); Hongyi Lai (Centre China Grid Company Limited, P.R. China)

After ultra-high voltage (UHV) tie lines are established, fluctuations of frequency and tie-line power become more obvious, which set a still higher demand on automatic generation control (AGC) performance. Frequency bias coefficient (K coefficient) plays the key role in improving control effect of AGC system. Based on operation characteristics of a domestic multi-area interconnected power system, this paper firstly proposes a calculation method of dynamic K coefficient in divided period. Furthermore, the evaluation criterion is first put forward to assess calculation results. Finally, an application example proves the validity of dynamic K coefficient in optimizing AGC operation.