snl.ccss.jpowerflow.util
Class Utilities

java.lang.Object
  snl.ccss.jpowerflow.util.Utilities

public class Utilities
extends java.lang.Object

This class is a place holder for common utilities needed by either the solvers created in this package or by other classes that might use this package. All methods should be static.

Author:

Bryan T. Richardson - Sandia National Laboratories

Field Summary

static flanagan.math.Matrix	jacobian Latest update of the Jacobian matrix, updated by FullNewton or DecoupledNewton class.
static java.util.HashMap	jacobianMap Latest update of the Jacobian map, updated by calling createJacobianMap.

Constructor Summary

Utilities()

Method Summary

static void	createJacobianMap(java.util.List busList) This method creates a new Jacobain map with an ACPFBus as the key and its corresponding Jacobian diagonal value as the value.
static double[]	getInverseSensitivities(double[] busArray)
static double	getMvarVoltageSensitivity(int position)
static void	printJacobian() This method prints the Jacobian matrix in a readable matrix-style format.
static double	roundDouble(double d, int places) This method rounds the double value given to the nth decimal place given.

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

jacobian

public static flanagan.math.Matrix jacobian

Latest update of the Jacobian matrix, updated by FullNewton or DecoupledNewton class. If updated by DecoupledNewton, it will only be quadrant 4 of the Jacobian matrix.

jacobianMap

public static java.util.HashMap jacobianMap

Latest update of the Jacobian map, updated by calling createJacobianMap. Jacobian values in the map are always from the diagonal of the 4th quadrant in the Jacobian matrix.

Constructor Detail

Utilities

public Utilities()

Method Detail

getInverseSensitivities

public static double[] getInverseSensitivities(double[] busArray)

getMvarVoltageSensitivity

public static double getMvarVoltageSensitivity(int position)

createJacobianMap

public static void createJacobianMap(java.util.List busList)

This method creates a new Jacobain map with an ACPFBus as the key and its corresponding Jacobian diagonal value as the value. This map only contains diagonal values from quadrant 4 of the Jacobian matrix. This provides reactive power sensitivity values for change in voltages.

Parameters:

busList - List of bus objects in the power system

printJacobian

public static void printJacobian()

This method prints the Jacobian matrix in a readable matrix-style format.

roundDouble

public static double roundDouble(double d,
                                 int places)

This method rounds the double value given to the nth decimal place given.

Parameters:

d - Double value to be rounded

places - Number of decimal places to round to

Returns:

double value given rounded to the nth decimal place given