By G. Suvire
ISBN-10: 9533074671
ISBN-13: 9789533074672
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The voltage for the operable solution is already available within data available from the EMS and hence it will be required to solve for the lower voltage solution. The Thévenin's equivalent can be estimated using the two voltage solutions as follows. − 2 VH ETH = − − ZTH = − − 2 − VL − (20) VH − VL − VH . VL P2 + Q2 , Θ TH = Φ − δ H − δ L (21) Where VH and VL are the complex values for the higher and lower voltages of the load node, P is the active power, Q is the reactive power, θTH is the angle of ZTH, Φ = atan(Q/P), and δH, δL are the angles of the high- and low-voltage solutions respectively.
Relying on the information and indicators provided by the chart the operator can make decisions about local corrective actions at the node where the wind farm is connected. The accuracy of the proposed chart is validated through comparing the information obtained from the chart with those obtained from the detailed load flow calculation using the IEEE 30-bus test system, which are found to be in nearly perfect agreement with each other. 5. Acknowledgment This work was supported by The Charles Parsons Energy Research Awards, which were created in September 2006 by the Minister for Communications, Marine & National Resources of Ireland and Science Foundation Ireland under the Strategy for Science, Technology and Innovation.
11. The complex voltage plane with all of the constraints on the PQ node voltage Fig. 12. 2 Test case IEEE 30 bus system is used as a test system for the voltage stability analysis and it will be the test system for this section as well. Bus 30 is chosen for application of the proposed method because it is the weakest bus of this system and WFs are usually connected at remote areas where the network is weak. The method can, however, be applied at any other bus. 019 pu). The higher voltage solution VH, VL and Thevenin equivalent are the same as in sec.
Wind Farm - Impact in Power System and Alternatives... by G. Suvire
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