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The modular multilevel converter (MMC) is a competitive candidate for VSC-HVDC systems. However, the conventional HB-MMC can't block dc link fault current because of the freewheeling effect of diodes. To solve this problem, researchers proposed an account of sub-modules (SMs) with DC-fault current clearing capability. This paper summarizes the 2 basic criteria and provides a comprehensive review of...
With the widespread use of solar energy, the grid-connected photovoltaic (PV) systems based on solid state transformer (SST) have considerable prospect. This paper presents the design and demonstration of a three-phase 800-V/10-kV 1-MW SST for grid-connected PV system. The topology of the 10-kV/1-MW SST is designed as a modular structure containing the dual active bridge (DAB) converter and full bridge...
As alternating current filter (ACF) sub-bank circuit breakers in DC transmission projects have been switched frequency and withstood AC/DC hybrid over-voltage, it is necessary to research the selection of characteristic parameter of ACF sub-bank circuit breakers in order to guarantee the safe operation. Operation and maintenance data in China Southern Power Grid Company Limited of the latest 15 years...
This paper describes the design and implementation of a prototype 30-kW (or 30-kJ/s) pulsed-power supply for capacitor charging. The system operates at 200-kHz maximum switching frequency, which is considerably higher than the conventional practice at this power level, leading to smaller passive components. A high power density of 143 W/in3 is achieved with the converter operating at a high ambient...
This paper presents an online fault diagnosing method for permanent magnetic DC motor. Fault model are defined by analyzing dynamic mathematical model of the permanent magnetic DC motor in loading status. According to the fault features defined in this paper, the author investigate failure experiments on several motors with the most common faults in application and analyzed the fault mechanism theoretically...
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