Normally this is corresponds the physical voltage rating of devices connected to this bus and voltages are epected to be close to this This means.00 per unit voltage is usually normal But strictly speaking it doesn t have to be.
Load flow analysis using power world simulator simulator#
1 Steady-State Power System Security Analysis with PowerWorld Simulator S: Power System Modeling Methods and Equations 00 South First Street Champaign, Illinois (7)Ģ Topics in the Section Nominal Voltage Levels Per Unit Values Admittance and Impedance Y-Bus Matri Buses Transmission Branches Loads Switched Shunts Generators Power Flow Equations PV, PQ, Slack buses Newton's Method Multiple Solutions -Bus Power Flow PV and QV Curves Maimum Loadability S: Power System Modeling 04 PowerWorld Corporationģ Transmission System: Nominal Voltage Levels Why do transmission systems operate at many different voltage levels? Power Voltage * Current Thus for a given power, if you use a higher voltage, then the current will be lower Why do we care? Transmission Losses Losses Resistance * (Current) Eample: What if we want to transmit 460 MW? At 30 kv, that means,000 Amps At 5 kv, that means 4,000 Amps Because current is Twice as high for 5 kv, that means the losses would be 4 times higher Thus Higher Voltage is better, but more epensive, thus there is a trade-off Means voltages vary depending on the situation S: Power System Modeling 04 PowerWorld Corporation 3Ĥ Transmission System: Nominal Voltage Levels Varying Nominal Voltage Harder for a human to compare the voltage levels Harder to handle in the equations used in power systems You d have to include turns-ratio multipliers all over the place This leads the industry to use a normalization method 38 kv 345 kv 38 kv 69 kv 345 kv 345 kv 38 kv 69 kv S: Power System Modeling 04 PowerWorld Corporation 4ĥ Transmission Voltage Normalization using Per-Unit Values Per unit values are used in power systems to avoid worrying about various voltage level transitions created by transformers They also allow us to compare voltages using a percentagelike number All buses in the power system are assigned a Nominal Voltage.
0 kommentar(er)
