Design of energy control method for three phase buck-type rectifier with very demanding load steps to achieve smooth input currents
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This document presents a design for a new energy control method for a three-phase buck-type rectifier, aimed at handling demanding load steps while achieving smooth input currents. It highlights the challenges associated with conventional rectifiers under pulsating power loads, particularly in aircraft applications, and proposes a solution that leverages the energy stored in the output capacitor to stabilize output voltage and reduce bandwidth demands. The proposed method addresses stability issues linked to the right half plane pole of constant power loads, allowing for low bandwidth voltage control while ensuring smooth power demand from the generator.
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Design of energy control method for three phase buck-type rectifier with very demanding load steps to achieve smooth input currents
- 1. DESIGN OF ENERGY CONTROL METHOD FOR THREE-PHASE BUCK-TYPE RECTIFIER WITH VERY DEMANDING LOAD STEPS TO ACHIEVE SMOOTH INPUT CURRENTS ABSTRACT Conventional three-phase rectifiers are controlled to achieve good power factor and low THD in the input. In the case of pulsating power loads, the fast dynamic response implies that the load pulses are reflected in the generator. These pulsating loads affect the life time operation of the generator, especially when it is not oversized (as in the case of aircraft applications). In order to smooth the power demanded from the generator, it is preferable to reduce the bandwidth of the output voltage controller for the rectifier but it affects its stability due to the fact that the right half plane (RHP) pole given by the negative impedance of a constant power load requires high bandwidth control loop to compensate it. In this paper, an energy control method is proposed that utilizes the energy stored in the output capacitor of the rectifier to control the output voltage of the rectifier. In such a way, the minimum bandwidth restriction imposed by the RHP pole of the power load is eliminated and the bandwidth of the voltage loop can be defined low enough to demand smooth power from the generator.