A manufacturing company has a typical base load demand of 4OMVA at 0.85pf lagging. To supplement their annual energy requirements, the company installed a wind turbine. The turbine drives a

star-connected, 8-pole induction machine generating into an 11kV. 60HZ, infinite bus-bar system. The machine can be modelled via a simplified, per phase equivalent circuit, as illustrated in Figure 2.1. The machine equivalent circuit parameters are detailed in Table 2.1. Assume that if the turbine speed falls below 91Orpm the induction machine line contactor opens disconnecting it from the supply, and the turbine blades are mechanically regulated to limit high speed operation. Calculate the apparent power at the machine terminals and hence the net electrical real and reactive power generation if the wind turbine speed is 1030.8rpm. For this operating condition, calculate the turbine mechanical power input and hence the induction generator efficiency. Add the induction generator output to the base load demand of the manufacturing company and comment on the resultant supply demand in terms of real and apparent power. Calculate the value of capacitance per phase of a star-connected, capacitor bank connectedin parallel with the induction generator to improve the generator power factor to unity at thestated operating condition.