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Generator reactive power in MVAR. Maximum reactive power in MVAR. Minimum reactive power in MVAR. U. U. Base MVA of the generator. Branch data - The branch data provide the line impedance and the line charging data. The data consist of the following: • • • • • • • • From bus number. To bus number. Branch identification number. U. on 100 MVA base. U. on 100 MVA base. U. on 100 MVA base. Line rating in MW. Line in or out identification code. Transformer data - The transformer impedance is expressed along with the branch data.
2 shows the calculated bus voltages using the Gauss-Seidel iteration method. Copyright 2002 by Marcel Dekker. All Rights Reserved. 9467 It can be seen that this solution approach converges faster than the Gauss method, since the updated values are used in each iteration. The Newton-Raphson method - A faster solution is obtained using the NewtonRaphson method and is suitable for large-scale problems. In this approach, the partial derivatives are used to construct the Jacobian matrix. 23) where [J] is the Jacobian matrix.
U. U. It is expected that within 15 minutes all line and cable loading can be reduced to within the long term emergency ratings by adjustment of phase shifting transformers and/or re-dispatch of generation. Sometimes, a contingency analysis is performed using the entire system. Then, the following types of cases are found in the results. Copyright 2002 by Marcel Dekker. All Rights Reserved. Acceptable cases - These are power flow cases, without any overloaded branches or undervoltage or overvoltage buses.