Power System Toolbox (PST)

PST was developed by Joe Chow of Rensselaer Polytechnic Inst. to enable users to perform power system analysis within MATLABÒ . It consists of a set of coordinated MATLAB m-files, power system application demo files, data files and a Users' Manual. A new version (3.0) is now available, which has been considerably enhanced from version 2.0.. This version is fully MATLAB 7.* compatible.

Version 3 is based on the version of PST developed for Power System Oscillations by Graham Rogers.

Load Flow Functions

• calc - calculates load flow mismatch and checks convergence
• form_jac - forms the load flow jacobian matrix
• line_pq - calculates real and reactive power flow on a line
• loadflow - Newton-Raphson load flow solution
• ybus - forms the power system network admittance matrix
• y_sparse - uses sparse matrix operations to form the network admittance matrix
• HVDC link load flow model with rectifier controlling current and inverter set to minimum extinction angle
• load flow under load tap changing
• load flow generator Var limit control

Dynamic Functions

• exc_dc12; exc_st3; smpexc - generator excitation system models
• mac_em; mac_sub; mac_tra - generator models
• mac_ind - induction motor model
• mac_igen - induction generator model
• HVDC link line and pole control models
• nc_load - non-conforming load model
• pss - power system stabilizer model
• svc - static var compensator model
• tg - turbine/governor model
• tg_hydro – hydraulic turbine governot model
• tcsc – thyristor controlled series capacitor
• control modulation models for exciters, svcs, tcscs, dc controls and loads
• red_ybus - reduces the y matrix to the generator internal buses and the non-conforming load buses

Data Sets

9 bus 3 generator system; 86 bus 16 generator system; 145 bus 50 generator system; New England test case; 2 area , 4 generator system; 19 generator system; single generator infinite bus system; plant against infinite bus system.

How to Use PST

PST may be used on any computer system supported by MATLAB. It is supplied as PC text files, but these may be easily converted to other formats if necessary. PST functions are meant to be used together to perform analysis. While there are a number of demo files which provide sample power system applications, PST has, potentially, much more than this to offer the user. Using the demos as templates, users can construct their own applications. For example, a continuation load flow solution algorithm could be constructed rather than the Newton-Raphson demo which comes with the software. Following the models supplied, it is quite straight forward to create similar models - an exciter model with a PID controller as Automatic Voltage Regulator, for example.

DEMO Functions

There are demo m-files for

• load flow ,
• voltage stability ,
• transient stability
• small signal stability
• power system stabilizer design

Sample Graphics

• Voltage Stability
• Transient Stability
• Small Signal Stability

How To Order PST

PST may be obtained from Graham Rogers at no charge.

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Graham Rogers RR#5 Colborne, Ontario, Canada K0K 1S0 Phone and Fax: (905)349-2485 email: cherry@eagle.ca

rev 9, June 18 2009