PW 6.6 PowerWorld Simulator cases Problem 6_61_PQ and 6_61_PV model a seven bus
ID: 2268646 • Letter: P
Question
PW 6.6 PowerWorld Simulator cases Problem 6_61_PQ and 6_61_PV model a seven bus power system in which the generation at bus 4 is modeled as a Type 1 or 2 wind turbine in the first case, and as a Type 3 or 4 wind turbine in the second. A shunt capacitor is used to make the net reactive power injection at the bus the same in both cases. Compare the bus 4 voltage between the two cases for a contingency in which the line between buses 2 and 4 is opened. What is an advantage of a Type 3 or 4 wind turbine with respect to voltage regulation following a contingency? What is the variation in the Mvar output of a shunt capacitor with respect to bus voltage magnitude?Explanation / Answer
A type 1 or 2 wind turbine is one which maintains a constant real and reactive power output. Hence, the bus it is connected to will be a PQ bus.
A type 3 or 4 wind turbine is one which maintains a constant voltage and real power output; the bus it is connected to will be a PV bus. In a contingency such as a line outage, the voltage in the PQ bus will change due to the
redistribution of power flows on the remaining lines. However, the voltage on a PV bus remains constant in a contingency, due to the fact that the type 3 or 4 wind turbine changes its reactive power output to maintain that voltage. In this regard, a type 3 or 4 wind turbine is more favorable.
The reactive power injection at a bus is directly proportional to the voltage magnitude at that bus.
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