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EEE471sldInt&ch2

EEE471sldInt&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
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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
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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
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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
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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)
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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
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17 Urban Distribution
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18 Rural Distribution
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19 69 kV Subtransmission
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