praktikum-holons/src/holeg/power_flow/AdmittanceMatrix.java

package holeg.power_flow;

import Jama.Matrix;

public class AdmittanceMatrix extends ComplexMatrix {
    public AdmittanceMatrix(int size) {
        super(size);
    }

    public static AdmittanceMatrix build(Bus[] buses, Line[] lines) {
        AdmittanceMatrix matrix = new AdmittanceMatrix(buses.length);

        // Convert line admittances to complex numbers
        ComplexNumber[] y = new ComplexNumber[lines.length];
        for (int i = 0; i < lines.length; i++) {
            Line line = lines[i];

            y[i] = (new ComplexNumber(line.R, line.X)).reciprocal();
        }

        for (int i = 0; i < lines.length; i++) {
            Line line = lines[i];
            ComplexNumber value = matrix.get(line.from, line.to).subtract(y[i].multiply(1 / line.a));
            matrix.set(line.from, line.to, value);
            matrix.set(line.to, line.from, value);
        }

        for (int i = 0; i < buses.length; i++) {
            for (int j = 0; j < lines.length; j++) {
                Line line = lines[j];
                ComplexNumber yLine = y[j];
                ComplexNumber b = new ComplexNumber(0, line.B_2);

                ComplexNumber Y = matrix.get(i, i);
                if (line.from == i)
                    Y = Y.add(yLine.multiply(1 / (line.a * line.a))).add(b);
                else if (line.to == i)
                    Y = Y.add(yLine).add(b);
                matrix.set(i, i, Y);
            }
        }
        return matrix;
    }

    public Matrix getG() {
        return getRealMatrix();
    }

    public Matrix getB() {
        return getImaginaryMatrix();
    }
}