power system lab
DESCRIPTION
Lab TutorialTRANSCRIPT
Power System Analysis Instructor: Sidra Mehmood
LAB # 2
Steady State Analysis
Objective
Use the Powergui (graphical user interface) block
Obtain the steady-state outputs of the system
Software Requirements
SimPowerSystems software requires the following products:
MATLAB
Simulink
Simscape™.
Steady State Analysis
In order to facilitate the steady-state analysis of your circuit, a graphical user interface (GUI) is
provided in the powerlib library. Copy the Powergui block into your circuit1 window and
double-click the block icon to open it. From the Analysis tools menu of Powergui, select Steady-
State Voltages and Currents. This opens the Steady State Tool window where the steady-state
phasors measured by the two measurement blocks are displayed in polar form.
Power System Analysis Instructor: Sidra Mehmood
Each measurement output is identified by a string corresponding to the measurement block
name. The magnitudes of the phasors U1 and U2 correspond to the peak value of the sinusoidal
voltages.
From the Steady State window you can also choose to display the steady-state values of the
source voltage or the steady-state values of states by checking either the Sources or
the States check box.
Power System Analysis Instructor: Sidra Mehmood
The state variable names contain the name of the block where the inductor or capacitor is found,
preceded by the Il_ prefix for inductor currents or the Uc_ prefix for capacitor voltages.
The sign conventions used for the voltages and currents of sources and state variables are
determined by the orientation of the blocks:
Inductor currents flowing in the arrow direction are considered positive.
Capacitor voltages are Vblock output - Vblock input.
Power System Analysis Instructor: Sidra Mehmood
Now, from the Tools menu of the powergui, select Initial Values of State Variables -->
Display or Modify Initial State Values. The initial values of the six state variables (three
inductor currents and three capacitor voltages) are displayed. These initial values are set in order
to start the simulation in steady state.