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This paper focuses on the behaviour of the cell capacitor discharge currents during DC faults in half-bridge modular multilevel converters. Active switches, not designed for fault conditions, are tripped to minimize discharge currents effect on the semiconductor switches. Two levels of device protection are commonly in place; driver level protection monitoring collector-emitter voltage and overcurrent...
One of the main challenges of voltage source converter based HVDC systems is DC faults. In this paper, two different modified half-bridge modular multilevel converter topologies are proposed. The proposed converters offer a fault tolerant against the most severe pole-to-pole DC faults. The converter comprises three switches or two switches and 4 diodes in each cell, which can result in less cost and...
This paper proposes a multi-loop controller for phase-controlled series-parallel resonant converter. Output voltage is solely measured for control and inner loop is used to enhance closed loop stability and dynamic performance compared to single-loop control. No additional sensors are used for inner loop variables. These are estimated using a Kalman filter, based on a linearized converter model. The...
This paper proposes a predictive output voltage controller for the phase-controlled series-parallel resonant converter. The objective of this controller is to enhance closed loop system robustness and dynamic performance compared to conventional PI control. First, the converter non-linear large signal behavior is linearized using a state feedback based scheme. Consequently, the converter preserves...
A linearized model of the phase-shifted series resonant converter is necessary for closed loop design. With fixed PI control design, the converter does not have good disturbance rejection capability and cannot always cope with a wide range of uncertainties. In this paper, a PI self-tuning mechanism based on a fuzzy logic scheme is proposed. It corrects the PI gains, initially designed using small-signal...
This paper provides an analytical discrete small-signal state-space model of the phase-shift modulated series resonant converter used to obtain an explicit linearized phase-shift to output voltage transfer function. This transfer function is useful for linear closed loop control design. Initially, the effective duty-ratio to output voltage transfer function is derived. It is then proven, analytically...
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