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EEE471sldInt&amp;ch2

# EEE471sldInt&amp;ch2 - POWER SYSTEM ANALYSIS EEE471/591...

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1 POWER SYSTEM ANALYSIS EEE471/591

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2 Introduction Power System Analysis can deal with all parts of power systems but for this course we will concentrate on: Looped, interconnected transmission system Power sources Bulk loads
3 Introduction Types of analysis: Fault analysis Steady state power flow and voltage System stability System control Analytic methods to be used: Manual calculations Power flow program Stability program Short circuit program

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4 Introduction To do power system analysis we need to model: Transmission lines Transformers Generators Loads Faults
5 Introduction Two major parts to the course: Modeling Analysis Two projects: Power flow project System stability project

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6 Introduction Function of a power system: Furnish “quality” electric power Reasonable cost Quality is defined as: 1. Limited voltage magnitude deviation ANSI standard for residential and commercial in the U. S. +/- 5%, 95 % of time +/- 8%, 99 % of time
7 Introduction Quality (continued): 2. Frequency deviation from nominal: No established standard but frequency does not deviate more than 0.1 Hz from 60 Hz 99% of the time. 3. Continuity of service SAIFI (Standard Average Interruption Frequency Index) is one measure

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8 Introduction 3. Continuity of service (continued) SAIFI numbers are generally in the range of 1 to 5. If there are an unacceptable number of interruptions, customers complain to regulation agency and to the utility SAIFI = Total Customers Customers Interrupted per Year
9 SAIFI(System Average Interruption Frequency Index)

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10 Introduction Quality (continued) 4. Freedom from voltage harmonics, spikes and dips. Normally referred to as “power quality” Increasingly important due to sensitivity of Computers and programmable logic controllers (PLC)
11 Introduction High power quality and low cost are in conflict Power system engineer is always trying to balance these conflicting factors A third factor that has become important is aesthetics which has led to: Underground distribution Low profile substations Some underground transmission lines Overhead line routing involving citizens and government

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12 Vertical Utility
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15 Customer Transformer

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16 Introduction Distribution System Primary Voltage range: 4 to 25 kV 7.2/12.5 kV in Phoenix area Generally 3-phase circuits 12.5 kV city feeders rated 8.5 – 10 MVA Overhead or underground 120/240 volts to customer
17 Urban Distribution

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18 Rural Distribution
19 69 kV Subtransmission

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