Electrical Power Transmission: Power Flow Studies

Which items are results of power flow analyzes? (Multiple correct answers)

• Voltage Levels

• Loading of the lines

• Stability measurments

• Transient calculation

• Transmission losses

In the system admittance matrix:

• The diagonal terms Y_ii are equal to the sum of the admittances of all devices’ incident to bus i.

• The off-diagonal terms, Y_ij, are equal to the sum of the admittances joining the

  two buses.

• Shunt terms, such as with the π-line model, affect both the diagonal and off-diagonal terms.

• With large systems, admittance matrix is a dense matrix (most entries are non-zero)

More than one correct answer:
When analyzing power systems (before concluding the power flow studies):

• We know bus Voltages.

• We know current injections.

• We know complex power consumed by loads.

• We know voltage magnitude of generators

Mark the true statements about slack bus (more than one correct answer)

• The voltage angle of slack bus is equal to the total power factor of the system.

• The voltage of slack bus is equal to 1 pu.

• The slack bus is responsible for the power losses of the whole system.

• Slack bus has a fixed voltage and injecting power.

For generator buses:

• The voltage, reactive, and active power are fixed.

• The voltage and active power are fixed.

• The active and reactive power are fixed.

• The voltage is fixed.