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Auxiliary Resonant Commutated Pole (ARCP) is a suitable ZVS soft-switching inverter topology in the UPS application. The control strategies may affect the ARCP inverter's reliability and efficiency performances. This paper compared the fixed timing control and variable timing control strategies for ARCP inverter. Current stress and loss distributions with different controls are given. The evaluation...
Among the paralleled UPS control strategies, output droop method and average power control method need to calculate UPS output active and reactive powers accurately for control of the phase (frequency) and amplitude of output voltage. In light or no load conditions, active circulation currents may cause high DC voltages which will damage the machine. This paper suggests using the UPS output filter...
The important characteristics of parallel-connected uninterruptible power supply (UPS) systems are excellent power-sharing quality and stability. In this paper we use the output active and reactive power to adjust the output voltage amplitude and phase to achieve the load sharing. Because of the difference of output filter inductor's resistance and distance of connection wire of each machine in the...
This paper deals with the design of good quality output voltage waveform and excellent power sharing of uninterruptible power system (UPS) inverters with parallel-connection capability. In this sense, the controller is designed by using two nested loops: 1) the inner loop is performed by using the output voltage and inductor current double loop controller, providing a good static and dynamic response...
This paper presents the analysis and loss evaluation of the hard-switching and soft-switching inverters in the three-phase uninterrupted power supply (UPS). Both two-level and three-level hard-switching inverters and the chosen soft-switching inverters are designed to evaluate the loss and the efficiency. Tests of the influence of IGBT collector-emitter paralleled capacitor on IGBT turn-off loss through...
Optimal control methodology is applied to the design of the feedback loops of a multi-inverter uninterruptible power supplies system. The control signals thus obtained will minimize a performance index, which is a function of the output voltage error, the inductor currents of all inverters and the reference signals. This enables the controller to achieve the desired objectives like minimization of...
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