PSSE-How to create a sample 50 Bus System

Step 1. Download the university version of PSS™E which is offered by the Siemens for free to university and students but is limited to 50 bus system. If a system greater than 50 bus has to be simulated then it is recommended to buy a licensed version of the software. Please keep in mind that one should not support piracy as huge amount of money is invested for developing such software.

Figure 1 - PSSE Version

Step 2. There are two ways by which data can be added to the system:

• • • In a spreadsheet form which are like an excel sheet (supports import from RAW file and input from Excel file) 

    • In diagram view by adding elements one by one (cannot be imported, not recommended for huge systems)

Figure 2 - Spread Sheet (Top), Diagram View (Bottom)

Step 3. Data has to be collected for every element in the system which are mentioned as follows:

• BUS DATA: Bus Number, Bus Name, Bus Base Voltage, Bus type code, Area, Zone, Owner. 

• LOAD DATA: Bus Number, Load Identification number, Status, Area, Zone, Active Power Component, Reactive Power component, Owner 

• GENERATOR DATA: Bus Number, Generator Identification number, Generator Active power output, Generator reactive power output, Maximum and minimum Reactive and active power producing capability, MVA base of each unit, Complex machine impedance. 

• BRANCH DATA: Branch From bus number, Branch to bus number, Branch resistance, Branch Reactance, Branch charging susceptance, Line rating in MVA, Length of the line. 

• TRANSFORMER DATA: Transformer From bus number, Transformer to bus number, Transformer resistance, Transformer Reactance, Branch charging susceptance, Transformer rating in MVA, Base MVA of Transformer. 

For more information about the data interpretation please go through the USER manual bundled with the PSS™E Software.

Step 4. Enter the data in the spread sheet form one by one of import from MS excel if data is in MS excel format. Things to be kept in mind:

• No bus should be left unconnected 

• There should at least be one swing bus in the system

Step 5. Now when all the data has been added to the system it can now be simulated.