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In this paper, a universal arm-averaged model (UAAM) is proposed for accelerated electromagnetic transient (EMT) simulation of modular multilevel converters (MMCs) based on various submodule (SM) circuits. In the UAAM, each arm of the MMC is averaged as a controlled voltage source (CVS) series connected with a controlled resistor (CR). The nonlinear characteristics of diodes are taken into consideration...
As the penetration of large-scale grid-connected wind farms increasing year by year, low voltage ride-through (LVRT) capability are required by many countries for power quality and fail-safe operation at grid fault. A new dynamic strategy using dynamic voltage restorer (DVR) is proposed in this paper to improve LVRT capability of wind turbine generators (WTGs). During the voltage dip, LVRT-DVR will...
Most converter-based power conditioner schemes for traction substation so far contain a pair of costly and bulky step-up transformers. A transformerless compensator is proposed in this paper to balance the loads of traction supply arms. This novel compensator employs a neutral-point-clamped three-level three-leg converter based on series connected IGBTs. Dynamic voltage balance of IGBTs is carried...
Series connection of IGBTs is applied to increase the voltage rating of converters. The critical issue is to balance the dynamic voltage of each device in the series string. This paper investigates an auxiliary circuit as a solution involving slope regulating and voltage clamping. It adjusts the Miller capacitance and gate current with additional capacitors and feedback current from collector to gate,...
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