In this model, a MOSFET driven by a pulse-width modulation (PWM) signal is used for
switching. The output voltage should be regulated to the reference value. A
digital PID controller adjusts the PWM duty cycle, , based on the voltage error
signal. For this example, you estimate the frequency response from the PWM duty cycle
to the load voltage.
Simscape Electrical software contains predefined blocks for many power electronics
systems. This model contains a variant subsystem with two versions of the boost
converter model:
- Boost converter circuit constructed using electrical power components. The
parameters of the circuit components are based on [1]. - Boost converter block configured to have the same parameters as the boost converter
circuit. For more information on this block, see Boost Converter.
Find Model Operating Point
To design a controller for the boost converter, you must first determine the steady-state
operating point at which you want the converter to operate. For more information on
finding operating points, see “Find Steady-State Operating Points for Simscape Models”
on page 1-136. For this example, use an operating point estimated from a simulation
snapshot.
To find the operating point, use the Linear Analysis Tool. To open the Linear Analysis Tool,
in the Simulink model window, select Analysis > Control Design > Linear Analysis.
Design Controller for Power Electronics Model Using Frequency Response Data