Test 1

9 novembro 2012, 08:00 • Luis Marcelino Ferreira

Test 1 -- power flow

Ten numerical problems to be solved from TE1 to TE5

Conclusion of symmetric fault analysis; beginning of a single phase fault

8 novembro 2012, 11:00 • Luis Marcelino Ferreira

Review of how to compute Isc:

Thevenin impedance Zii and voltage source V0

Superposition needed for voltage calculation

How to compute voltage due to -V0

Simplicity of final formula: Vj=Vj0-Zij/Zii*Vi0

Conclusion of symmetric fault analysis;

Imbalance: single phase fault

Generator model: simplest model, impedances behind E's

Now voltages and currents are 3-dimension vectors

Impedances are (3x3)

How to simply compute Isc

What about voltages?

Importance of mutual coupling

Characteristicas of the Z matrix for the generator model

Two additional power flow problems

6 novembro 2012, 11:00 • Luis Marcelino Ferreira

Review of the resolution of book problems as a recommend practice

A problem for radial power flow

Computation of currents for the first iteration: example

For the same example, computation of node voltages for the first iteration

A second problem: a two-bus power flow problem in which the load is P=f(V) and Q=g(V)

Cases for f and g polynomial and exponentials

Review of Prob 6.6: elasticity 0, 1 and 2

Resolution in polar coord and in rectangular coord

Surprising simplicity of using rectangular coord

Discussion of the results in terms of the severity of angles and flow wrt elasticities

Symmetric short circuit analysis

6 novembro 2012, 09:30 • Luis Marcelino Ferreira

How to compute Isc for any node of any network

The application of results from circuit analysis and linear system theory

Review of concepts of admittance and impedance

Interpretation of Zii and Zij

Computation of Isc thru Zii

Computation of sc voltages thru Zij

Test 1

5 novembro 2012, 08:00 • Luis Marcelino Ferreira

Test 1 -- power flow

Ten numerical problems to be solved from TE1 to TE5