FIGURE 9.16
• MODELING AND SIMULATION PROGRAM FOR POWER SYSTEM (INCLUDING POWER ELECTRONICS AND DRIVES)
• EXTENDED SIMULINK SIMULATION WITH GUI
• HYBRID SIMULATION CONTAINING BLOCKS OF SIMPOWERSYSTEMS AND SIMULINK
• MODELS OF POWER SYSTEM EQUIPMENT AND ELEMENTS ARE STORED IN LIBRARY
• PSPICE-LIKE SCHEMATIC-ORIENTED CIRCUIT AND SYSTEM SIMULATION
• NEEDS SIMULINK AND MATLAB ENVIRONMENT
• SIMULATION CAN BE LINKED WITH OTHER TOOLBOXES
• EXAMPLES OF POWER SYSTEM BLOCKSET (PSB) LIBRARY
(powerlib) CONTENTS:
MODELS OF POWER ELECTRONICS COMPONENTS
MODELS OF DC, INDUCTION AND SYNCHRONOUS
MACHINES
ELECTRICAL SOURCES AND CIRCUIT ELEMENTS ELECTRICAL CIRCUIT MEASUREMENTS CIRCUIT AND SYSTEM ANALYSIS WITH GUI
SimPowerSystems (MathWorks) [10] is basically an extension of the Simulink program that is designed for simulation of power systems that may include dc drives, ac drives, general converter systems, and power generation, transmission, and distribution systems. One important feature of this program is that mathematical models of key power system components are stored in the library where the icons can be fetched and interconnected graphically to set up the simulation. The parameters of the component can be defined in the dialog boy. Models available to the user include the electrical sources, linear and nonlinear passive elements, three-phase elements, power electronics components, electrical machines, electrical circuits measurements, electrical circuits analysis with GUI, and signal and pulse sources. For example, the power electronics library includes diodes, ideal switches, thyristors, GTOs, MOSFETs, IGBTs, two-level universal bridges, and three-level bridges. Similarly, the machine library includes dynamic models of dc machines, induction machines, synchronous machines (PM and wound-field), etc. Each machine model comes with a Mux to measure the key electromechanical response variables. The SimPowerSystems blocks can be combined with Simulink blocks to describe the schematic for a complete power system. A power electronics system is simulated in discrete time with fixed sample time. Simulation results can be displayed on scope, stored in files, or directly analyzed, for example, by FFT with a graphical interface. The simulation is schematic oriented like PSPICE, but is more powerful. Two example simulations of power electronics systems will be given for clarity.