Development of an electronic control unit for the T63 gas turbine

Includes bibliographical references.Fundamental research has been undertaken at the SASOL Advanced Fuels Laboratory to investigate the effects of the chemistry and physical properties of both conventional and synthetic jet fuels on threshold combustion. This research was undertaken using a purpose built low pressure continuous combustion test facility. Researchers at the laboratory now wish to examine these effects on an aviation gas turbine in service for which “off-map” scheduling of fuel to the engine would be required. A two phase project was thus proposed to develop this capability; the work of this thesis embodies Phase I of that project

Voltage Stability Assessment of Power System with Distributed Generation in Free and Open Source Software

This paper presents voltage stability analysis of distributed generation (DG) in mesh distribution network in Power System Analysis Toolbox (PSAT) — free and open source software. Voltage stability analysis of a power system is a necessity, particularly in the planning period of the development or expansion of a power network. The ultimate goal of this paper is to investigate the voltage stability of the 52 buses power system network (Mandalay City) during the expansion of the network. In this paper, a study is being done to expand the power network of the area of Mandalay City. In order to perform the voltage stability analysis, modal analysis as well as PV curves was evaluated based on load flow for selected scenarios. PSAT has been developed to carry out the static voltage stability analysis. And also the dynamic voltage stability analysis has been performed by using time domain simulation with PSAT software

Performance and economic analysis of hybrid microhydro systems

Microhydro (MHP) systems usually employ unregulated turbines and an electronic load controller, a demand-side control device. Existing analytical models for such systems are lacking details, especially supply-side flow control, for performance simulation at hourly or sub-hourly scales. This work developed stochastic models for downscaling of streamflow and an empirical model of MHP systems. We integrated these models within the framework of Hybrid2 tool to simulate the long-term performance of a tri-hybrid system consisting of hydropower, solar PV and wind turbine. Based on an additive model of time series decomposition, we develop a Multiple Input Single Output (MISO) model in order to synthesize an hourly time series of streamflow. The MISO model takes into account daily precipitation dataset as well as regional hydrological characteristics. The model employs a constrained Monte-Carlo Markov Chain (MCMC) algorithm which is validated against an hourly time series of flow data at Blue River at Blue, Oklahoma. A non-dimensional performance model of MHP systems is developed based on empirical data from Nepal. Three design configurations are presented for a case study. The results show that, along with a small pond that can store water for an hour at the rated capacity of MHP system, a hybrid system with half the size of the battery bank can supply the load year around at Thingan Project in Nepal. This system meets the availability requirements of the Multi-Tier Framework for measuring energy access for household supply. The new proposed system is marginal in the economic sense as well. This project can never recover the initial capital cost at a current rate of the tariff which is about 7 cents/kWh. Other O&M risks aside, the sensitivity analysis suggests that the system may barely recover the initial capital cost, excluding the subsidy, at twice the existing rate of tariff and half the interest rate. This study aspires to come up with better techniques to simulate hybrid microhydro systems and enhance their design and operation through more effective utilization of resources

Impact of vehicle to grid in the power system dynamic behaviour

This work was supported in part by FCT-Fundação para a Ciência e a Tecnologia de Portugal, under the grant SFRH/BD/47973/2008 and within the framework of the Project "Green Island" with the Reference MIT-PT/SES-GI/0008/2008, by the European Commission within the framework of the European Project MERGE - Mobile Energy Resources in Grids of Electricity, contract nr. 241399 (FP7) and by INESC Porto - Instituto de Engenharia de Sistemas e Computadores do PortoTese de doutoramento. Sistemas Sustentáveis de Energia. Universidade do Porto. Faculdade de Engenharia. 201

Developing Generic Dynamic Models for the 2030 Eastern Interconnection Grid

The Eastern Interconnection Planning Collaborative (EIPC) has built three major power flow cases for the 2030 Eastern Interconnection (EI) based on various levels of energy/environmental policy conditions, technology advances, and load growth. Using the power flow cases, this report documents the process of developing the generic 2030 dynamic models using typical dynamic parameters. The constructed model was validated indirectly using the synchronized phasor measurements by removing the wind generation temporarily

IMPROVING A TRANSIENT STABILITY CONTROL SCHEME WITH WIDE-AREA SYNCHROPHASORS AND THE MICROWECC, A REDUCED-ORDER MODEL OF THE WESTERN INTERCONNECT

This thesis is composed of two research projects. The first project investigated the feasibility of improving a generator tripping control scheme using wide-area synchrophasors and the second project focused on building a reduced-order model of the western North American power system (wNAPS) for use in a real-time digital simulator. Transient stability is a major reliability issue for power systems. Radially-connected power plants are especially prone to transient stability problems. An example of this is the fourgenerator Colstrip power plant located in southeast Montana, USA. The Colstrip generators are protected by a tripping control system called the Acceleration Trend Relay (ATR) that is designed to disconnect generators during system disturbances to prevent asynchronous operation and further system instability. Like most transient stability tripping schemes, the ATR relies entirely on local information. However, because transient stability is a wide-area phenomenon determined by the relative synchronism of the system, local information can produce misoperations causing the ATR to false trip. The first part of this thesis studied the feasibility of using wide-area synchrophasors provided by phasor measurement units (PMUs) to improve protection schemes such as the ATR. Transient stability software was used to model the ATR and evaluate the benefits of adding wide-area measurements to the control scheme. Real-time simulators are effective tools for studying power systems because they can accurately reproduce electromechanical dynamics while allowing for prototype controllers to be physically connected. However, they impose serious limitations on the size of systems that can be modeled. Model order reduction techniques can be used to lower the computational complexity of a system while approximating the dynamics of the original model. The second part of this thesis presents a reduced-order model of the wNAPS termed the “MicroWECC.” The MicroWECC is a further reduction of the MiniWECC model and was designed to have approximate impedance, generation, and modal characteristics. The model was constructed in two positive-sequence transient simulation tools and then modal analysis was performed to compare the MicroWECC to the MiniWECC model. Parameters for electromagnetic transient program (EMTP) models were also suggested

An Assessment of PIER Electric Grid Research 2003-2014 White Paper

This white paper describes the circumstances in California around the turn of the 21st century that led the California Energy Commission (CEC) to direct additional Public Interest Energy Research funds to address critical electric grid issues, especially those arising from integrating high penetrations of variable renewable generation with the electric grid. It contains an assessment of the beneficial science and technology advances of the resultant portfolio of electric grid research projects administered under the direction of the CEC by a competitively selected contractor, the University of California’s California Institute for Energy and the Environment, from 2003-2014