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In high-power converters based on SiC-MOSFET half-bridge modules, laminated busbar plays a critical role in linking the DC capacitor bank to power modules. The busbar stray capacitance has the same order of magnitude with drain-source capacitance of SiC-MOSFET and has a great impact on the turn-off voltage oscillation of SiC-MOSFET. In this paper, parasitic elements of a three-layer laminated busbar...
Voltage deviations of dc-link capacitors are the main problem of multilevel diode-clamped converters (DCC). In this paper, a novel carrier-based voltage balance method is proposed to balance the dc-link capacitors of five-level DCCs. The proposed method is characterized by injecting proper zero-sequence voltages in the modulation signals of carrier-based modulators. The effects of the injected zero-sequence...
Voltage Balance of the series-connected dc-link capacitors is the key problem of three-level diode-clamped converters. In this paper, an auxiliary voltage balance circuit (VBC) is presented to maintain the voltage balance of dc-link capacitors. The voltage balance circuit consists of a clamping capacitor and a current-limiting inductor. With the clamping capacitor, the voltage stresses of the auxiliary...
Five-level neutral point clamped H-bridge (NPCH) converter has been found practical application due to its low EMI and high output capacity. However, the unbalanced loss distribution of semiconductor devices in NPCH converter would limit the lifetime and the output capacity. In this paper, a five-level active neutral point clamped H-bridge (ANPCH) converter topology is studied, which is composed two...
The three-level neutral-point-clamped converter has been widely used in medium voltage range for industrial applications, however, the unbalance distribution of power loss of three level NPC converter limit the output power, the three level active neutral point clamped (ANPC) converter provides more flow paths which can improve the balance of power loss distribution. Fault diagnosis in power electronic...
In this paper, a novel current control strategy applied in linear synchronous motor (LSM) drive system is proposed based on resonant proportion (PR) current controller. First, the characteristics of PR regulator is analyzed in detail, and the theoretical model of LSM in stationary reference frame is established. Then the structure for the control strategy is given. It consists of an outer PI speed...
This paper proposes a high performance control method with Multi-CPU synchronous, time-delay and feedforward compensation for High-Speed Maglev. The proposed control strategies are verified on Real-Time simulation platform with Hardware-In-Loop. The experimental results demonstrate that by using the proposed methods the high-speed maglev can be operated in a whole speed range from 0 to 500km/h.
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