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Version 5.1 (R2009a) SimPowerSystems Software

This table summarizes what's new in Version 5.1 (R2009a):

New Features and Changes	Version Compatibility Considerations	Fixed Bugs and Known Problems	Related Documentation at Web Site
Yes Details below	Yes—Details labeled as Compatibility Considerations within descriptions of new features and changes, below. See also Summary.	Bug Reports Includes fixes	No

New features and changes introduced in this version are

• Powergui Tools Are Also Available as Standalone Command-Line Functions

• Enhancements to the Ideal Switching Algorithm

• Powergui Block No Longer Added Automatically

• Changes to the Battery Block

• New SimPowerSystems Demos

Powergui Tools Are Also Available as Standalone Command-Line Functions

The graphical user interface analysis tools, available in the Powergui block, are now also implemented as standalone command-line functions. Each of these tools can be activated by entering the appropriate command at the MATLAB prompt. For more information, see the following reference pages: power_fftscope, power_hysteresis, power_initstates, power_lineparam, power_loadflow, power_ltiview, power_report, power_steadystate, power_zmeter.

Enhancements to the Ideal Switching Algorithm

The Display circuit differential equations option, available in the Powergui block parameters dialog box, lets you display differential equations of the model in the command window when the simulation starts. This option is visible only if Enable use of ideal switching devices is selected. For more information, see Using the Ideal Switching Device Method.

Powergui Block No Longer Added Automatically

The Powergui block is no longer automatically added to your model upon simulation. You need to explicitly add it to your model. For more information, see Using the Powergui Block to Simulate SimPowerSystems Models.

Compatibility Considerations

If you have an old model without a Powergui block, which used to run in previous releases because Powergui was added automatically during simulation, you will now get an error trying to simulate it. Add a Powergui block and save the model to avoid the error.

Changes to the Battery Block

The Battery block has been improved to accurately represent the battery dynamics during the charge and the discharge processes. The model parameters and the meaning of some detailed parameters have changed since the last release, as described in the following section.

Compatibility Considerations

The Battery block parameters have been changed in Version 5.1 (R2009a). If you used the (No) User-Defined option for the Battery Type parameter in previous releases and defined particular detailed parameters for your Battery block, the software will automatically convert your old block parameters into new values corresponding to the block changes.

The following table compares the old parameter names to the new ones. It also provides details on how the new values are computed:

Old Parameters	New Parameters and Values
Battery Type, set to (No) User-Defined	Battery Type, set by default to Nickel-Metal-Hybrid
-	Maximum Capacity (Ah) = RatedCapacity*1.05
Full charge voltage (%)	Fully charged voltage (v) = [oldvalue]/100*NominalVoltage
Nominal Discharge Current (% of Rated Capacity)	Nominal Discharge Current (A) = [oldvalue]/100*RatedCapacity
Capacity (% of Rated Capacity) @ Nominal Voltage	Capacity (Ah) @ Nominal Voltage = [oldvalue]/100*RatedCapacity
Exponential zone Voltage (%) Exponential zone Capacity (% of the Rated Capacity)	Exponential zone Voltage (V) = [oldvalue]/100*NominalVoltage Exponential zone Capacity (Ah) = [oldvalue]/100*RatedCapacity

New SimPowerSystems Demos

The following demos have been added in Version 5.1:

Demo Name	Description
Computation of R L and C Cable Parameters (power_cable)	Illustrates use of the power_cableparam demo function to calculate the R,L, and C parameters of two 132kV 2-phase cables with screen cables.
Single-Phase Dynamic Load Block (power_1phdynamicload)	Illustrates an example of a single-phase dynamic load block built with Simulink blocks. This is the recommended template for interfacing custom-built Simulink blocks with SimPowerSystems models.
Zener Diode Regulator (power_zener)	Presents a model of the zener diode used in a voltage regulator.
Full Wave Rectifier (power_FullWaveRectifier)	Illustrates use of the Ideal Switching Device solution method to simulate a full wave rectifier using ideal diodes.
Multilevel Multiphase Space-Vector PWM (power_svpwm_multiPhasesLevel)	Illustrates modeling and operation of the Multilevel Multiphase Space-Vector PWM and Two-Level Multiphase Space-Vector PWM blocks. The demo includes a five-level five-phase inverter feeding a passive load.
Synchronous Generator and Full Scale Converter (Type 4) Detailed Model (power_wind_type_4_det)	Illustrates simulation of a 10 MW wind farm using a detailed model of a Type 4 wind turbine.
Synchronous Generator and Full Scale Converter (Type 4) Average Model (power_wind_type_4_avg)	Illustrates simulation of a 10 MW wind farm using an average model of a Type 4 wind turbine.

Version 5.2 (R2009b) SimPowerSystems Software

Version 5.0 (R2008b) SimPowerSystems Software

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