ECE 476 POWER SYSTEM ANALYSIS

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ECE 476 POWER SYSTEM ANALYSIS
Presentation transcript:

ECE 476 POWER SYSTEM ANALYSIS Lecture 1 Introduction M.E.E. Muhammad Al-Badri Department of Electrical and Computer Engineering

Simple Power System Every power system has three major components generation: source of power, ideally with a specified voltage and frequency load: consumes power; ideally with a constant resistive value transmission system: transmits power; ideally as a perfect conductor

Complications No ideal voltage sources exist Loads are seldom constant Transmission system has resistance, inductance, capacitance and flow limitations Simple system has no redundancy so power system will not work if any component fails

Notation - Power Power: Instantaneous consumption of energy Power Units Watts = voltage x current for dc (W) kW – 1 x 103 Watt MW – 1 x 106 Watt GW – 1 x 109 Watt Installed U.S. generation capacity is about 900 GW ( about 3 kW per person) Maximum load of Champaign/Urbana about 300 MW

Notation - Energy Energy: Integration of power over time; energy is what people really want from a power system Energy Units Joule = 1 Watt-second (J) kWh – Kilowatthour (3.6 x 106 J) Btu – 1055 J; 1 MBtu=0.292 MWh U.S. electric energy consumption is about 3600 billion kWh (about 13,333 kWh per person, which means on average we each use 1.5 kW of power continuously)

Power System Examples Electric utility: can range from quite small, such as an island, to one covering half the continent there are four major interconnected ac power systems in North American, each operating at 60 Hz ac; 50 Hz is used in some other countries. Airplanes and Spaceships: reduction in weight is primary consideration; frequency is 400 Hz. Ships and submarines Automobiles: dc with 12 volts standard Battery operated portable systems

Electric Systems in Energy Context Class focuses on electric power systems, but we first need to put the electric system in context of the total energy delivery system Electricity is used primarily as a means for energy transportation Use other sources of energy to create it, and it is usually converted into another form of energy when used About 40% of US energy is transported in electric form Concerns about need to reduce CO2 emissions and fossil fuel depletion are becoming main drivers for change in world energy infrastructure

Sources of Energy - US About 86% Fossil Fuels CO2 Emissions (millions of metric tons, and per quad) Petroleum: 2598, 64.0 Natural Gas: 1198, 53.0 Coal: 2115, 92.3 1 Quad = 293 billion kWh (actual) 1 Quad = 98 billion kWh (used, taking into account efficiency) About 86% Fossil Fuels In 2009 we got about 0.75% of our energy from wind and 0.04% from solar (PV and solar thermal) Source: EIA Energy Outlook 2011

US Historical Energy Usage

Global Warming and the Power Grid, What is Known: CO2 in Air is Rising Value was about 280 ppm in 1800; in 2011 it is 394 ppm Source: http://www.esrl.noaa.gov/gmd/ccgg/trends/

As Has Been Worldwide Temperature Baseline is 1961 to 1990 mean Source: http://www.cru.uea.ac.uk/cru/info/warming/

But Average Temperatures are Not Increasing Everywhere Equally Source: http://www.isws.illinois.edu/atmos/statecli/Climate_change/iltrends.htm

Thanks Any ?????