Power System Blockset

The Power System Block Libraries

The Power System Blockset's main library powerlib organizes its blocks into libraries according to their behavior. The powerlib window displays the block library icons and names:

• The Electrical Sources library contains blocks that generate electric signals.
• The Elements library contains linear and nonlinear network elements.
• The Power Electronics library contains power electronics devices.
• The Machines library contains machinery models.
• The Connectors library contains blocks that can be used to interconnect blocks in various situations.
• The Measurements library contains blocks for the current and voltage measurements.
• The Extras library contains three-phase blocks and specialized measurements and control blocks. This library can also be opened by typing powerlib_extras in the MATLAB window. These blocks are not documented in the block reference section.
• The Demos library contains useful demos and case studies.

The powerlib window also contains the following blocks:

• The Powergui block that opens a graphical user interface for the steady-state analysis of electrical circuits.
• The Discrete System block that is used to discretize your electrical models.

The Simulink models of the nonlinear blocks of powerlib are stored in a library named Powerlib_models. These Simulink models are used by the Power System Blockset to build the equivalent Simulink model of your circuit. See the Avanced Topics chapter for a description of the Powerlib_models library.

Table 4-1: Electrical Sources Library Blocks

Block Name	Purpose
AC Current Source	Implement a sinusoidal current source
AC Voltage Source	Implement a sinusoidal voltage source
Controlled Current Source	Implement a controlled current source
Controlled Voltage Source	Implement a controlled voltage source
DC Voltage Source	Implement a DC voltage source

Table 4-2: Elements Library Blocks  

Block Name	Purpose
Breaker	Implement a circuit breaker opening at current zero crossing
Distributed Parameter Line	Implement a N-phases distributed parameter line model with lumped losses
Linear Transformer	Implement a two- or three-windings linear transformer
Mutual Inductance	Implement a magnetic coupling between two or three windings
Parallel RLC Branch	Implement a parallel RLC branch
Parallel RLC Load	Implement a linear parallel RLC load
PI Section Line	Implement a single phase transmission line with lumped parameters
Saturable Transformer	Implement a two- or three-windings Saturable Transformer
Series RLC Branch	Implement a series RLC branch
Series RLC Load	Implement a linear series RLC load
Surge Arrester	Implement a metal-oxide surge arrester
Three-Phase Transformer (Two Windings)	Implement a three-phase transformer with two windings
Three-Phase Transformer (Three Windings)	Implement a three-phase transformer with three windings

Table 4-3: Power Electronics Library Blocks  

Block Name	Purpose
Diode	Implement a diode model
GTO	Implement a gate-turn-off (GTO) thyristor model
Ideal Switch	Implement an ideal switch model
IGBT	Implement an insulated-gate-bipolar-transformer (IGBT) model
MOSFET	Implement a metal-oxide-semiconductor-field-effect-transistor (MOSFET) model
Thyristor	Implement a thyristor model

Table 4-4: Machines Library Blocks  

Block Name	Purpose
Asynchronous Machine	Model the dynamics of a three-phase asynchronous machine
DC Machine	Model a separately excited DC machine.
Excitation System	Provide an excitation system for the synchronous machine and regulate its terminal voltage in generating mode
Hydraulic Turbine and Governor	Model a hydraulic turbine and a PID governor system
Permanent Magnet Synchronous Machine	Model the dynamics of a three-phase permanent magnet synchronous machine with sinusoidal flux distribution
Simplified Synchronous Machine	Model the dynamics of a simplified three-phase synchronous machine
Steam Turbine and Governor	Implements a steam turbine and governor system
Synchronous Machine	Model the dynamics of a three-phase salient-pole synchronous machine

Table 4-5: Connectors Library Blocks

Block Name	Purpose
Bus Bar	Implement a labeled network node
Ground	Provide a connection to the ground
Neutral	Implement a local common node in the circuit

Table 4-6: Measurements Library Blocks

Block Name	Purpose
Current Measurement	Measure a current in a circuit
Impedance Measurement	Measure the impedance in a circuit as a function of the frequency
Multimeter	Measure voltage and current in Power System Blockset blocks
Voltage Measurement	Measure a voltage in a circuit

Block Reference

Alphabetical List of Blocks