The Power System Blockset has been renamed to SimPowerSystems in Release 13. As a part of the Physical Modeling family of products, SimPowerSystems and SimMechanics work together with Simulink to model electrical, mechanical, and control systems. The user's guide continues to refer to the product as Power System Blockset.
Browse blocks and commands by following these links:
Printable versions of SimPowerSystems User's Guide (6.4 Mb) and SimPowerSystems Release Notes are available in PDF format.
The MathWorks provides several related products that are especially relevant to the kinds of tasks you can perform with SimPowerSystems, including SimMechanics, Stateflow, Real-Time Workshop, and others.