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Due to the high switching speed of SiC MOSFET, the parasitic parameters and the low damping in the circuit, the turn-off overvoltage and oscillation of the freewheeling diode and SiC MOSFET are very severe. Based on the terminal impedances during the turn-off transition of the freewheeling diode and SiC MOSFET, the mechanism of the turn-off overvoltage and oscillation are analyzed and the suppressing...
The hybrid high voltage direct current (Hybrid HVDC) system based on line commutated converter (LCC) and modular multilevel converter (MMC) is a feasible solution for long distance bulk power transmission. In order to handle the dc-side short-circuit fault, two kinds of methods can be adopted. The first one is to replace half-bridge sub-modules (HBSMs) with full-bridge SMs or clamp-double SMs which...
This paper describes an asymmetric 6.4-Gb/s memory interface for a wide range of DIMM configurations for desktop and server applications. The link uses a fly-by quadrature forwarded clock to enable fast startup and power-mode transitions on the DRAM and per-bit timing adjustment on the controller to enable the high-speed signaling. Single-ended low-swing near-ground signaling (NGS) is introduced in...
In this paper, a novel soft-switching three-arm series-compensation automatic voltage regulator is proposed. The proposed automatic voltage regulator (AVR) uses a three-arm topology that operates as a rectifier and an inverter. The rectifier arm is switched at high switching frequency, to perform power factor correction and simultaneously transfer the power demand for the load to the DC link capacitor...
This paper proposed a novel single-phase soft-switching unipolar PWM active power filter (SSUPAPF). The proposed active power filter uses a simple auxiliary resonant circuit. The main switches of high-frequency arm operate at zero-voltage- switching (ZVS) turn-on. Also, the auxiliary switches operate at zero-current-switching (ZCS) turn-off. The main switches of low-frequency arm operate at 60Hz to...
Based on the synthetic control of microgrid, a flexible power electronics interface is developed in this paper. Considering distributed generation types and storage devices, different control strategies are adopted in controller design for different distributed generation units. The interface comprises a couple of back-to-back VSC converters, and exports variable active power and reactive power in...
In this paper, control strategies of VSC-HVDC aiming to improve the ability of fault ride through of the VSC-HVDC system under serious asymmetric fault at the receiving side was studied. On the basis of DQ decoupling control scheme, two additional fault control modules are proposed based on positive and negative sequence detecting technology. One is based on negative sequence voltage compensation,...
The differential and algebraic equations (DAE) of power systems which describe transient voltage security problem is established. Representation of load shedding is deduced in terms of the three order induction motor paralleled with constant impedance load model. The optimization model of emergency load shedding control of transient voltage security (ELSCTVS) is presented in which transient voltage...
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