This paper presents the energy saving method by
applying the voltage control technique on a single-phase AC source to a
thyristor rectifier and an IGBT inverter with LC filter. Based on the LC filter
parameter, the values of the gain for the controller are obtainable. The
proposed controller structure consists of two loops arranged in a
cascaded model. The output of the first loop is the capacitor current. This
current is added to the load current in order to obtain the current reference.
This reference current value will be compared with the inverter current which
produces the error signal to be fed into the second loop in the cascade system.
The output of the second loop is the inverter voltage. This voltage is added to
the load voltage to produce the voltage reference. This reference is fed to the
pulse width modulation generator via the controller and compared with the
triangular wave. This energy-saving circuit is designed in blocks using MATLAB Simulink.
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