Đang chuẩn bị nút TẢI XUỐNG, xin hãy chờ
Tải xuống
Lecture Methods of Electric power systems analysis - Lesson 6: Power operations, power flow provide students with knowledge about three bus powerworld simulator case; basic power control; power flow in transmission line is limited by heating considerations; overloaded transmission line; automatic generation control; . | ECEN 615 Methods of Electric Power Systems Analysis Lecture 6 Power Operations Power Flow Prof. Tom Overbye Dept. of Electrical and Computer Engineering Texas A amp M University overbye@tamu.edu Announcements Read Chapter 6 from the book The book formulates the power flow using the polar form for the Ybus elements Homework 2 is due on Thursday September 17 1 Three Bus PowerWorld Simulator Case PowerWorld Case Name B3Slow Load with Area Name Home ACE -15.5 MW green Home Area 25.4 MW MW Load 316.2 MW MW Gen 301.0 MW 25.5 MW MW Losses 0.28 MW arrows Bus 2 5.3 Mvar A -4.9 Mvar A Bus 1 1.00 pu indicating 210.8 MW 105.4 Mvar MVA MVA slack 1.00 pu amount A A 115.4 MW -1.9 Mvar of MW 151.0 MW AGC OFF 34.3 MW MVA A A MVA 10.1 MW 100 MW AVR ON 10.6 Mvar 3.1 Mvar flow 121.3 Mvar 34.5 MW MVA MVA 10.1 MW -3.0 Mvar Other Area -10.0 Mvar Scheduled Transactions 1.00 pu 0.0 MW Bus 3 105.4 MW Note the Off AGC 150.0 MW 52.7 Mvar power Used 39.7 Mvar AVR ON AGC ON balance at to control each bus output of Direction of green arrow is used to indicate generator direction of real power MW flow the blue arrows show the reactive power 2 Basic Power Control Opening a circuit breaker causes the power flow to instantaneously nearly change. No other way to directly control power flow in a transmission line. By changing generation we can indirectly change this flow. Power flow in transmission line is limited by heating considerations Losses I 2 R can heat up the line causing it to sag. 3 Transmission Line Limits Power flow in transmission line is limited by heating considerations. Losses I2 R can heat up the line causing it to sag. Each line has a limit many utilities use winter summer limits. 4 Overloaded Transmission Line Area Name Home ACE -263.1 MW Home Area MW Load 559.2 MW -162.5 MW MW Gen 301.0 MW 165.3 MW Bus 2 39.8 Mvar MW Losses 4.91 MW -25.8 Mvar Bus 1 A A 1.000 pu 112 112 372.8 MW MVA MVA 186.4 Mvar slack 1.000 pu A A 363.0 MW MVA -52.3 Mvar MVA -59.2 MW 151.0 MW AGC OFF A A 97.7 MW
