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In order to strengthen the framework structure of distribution network, promote the agility of its control methods, and improve its intelligent and automation level, Soft Normally-Open Point (SNOP) as a novel power electronic device is installed in distribution network, which can provide accurate control of real and reactive power flow. This paper proposed the dynamic mathematical model of three-port...
This paper presents a steady-state analysis of the modular multilevel converter (MMC) for the second order voltage and current ripple prediction under unbalanced conditions, taking the impact of negative sequence current control into account. Using the circular relationship among current and voltage quantities, the magnitudes and initial phase angles of different circulating current components can...
This paper presents the analysis and control of a multilevel modular converter (MMC)-based HVDC transmission system under three possible single-line-to-ground fault conditions, with special focus on the investigation of their different fault characteristics. Considering positive-, negative-, and zero-sequence components in both arm voltages and currents, the generalized instantaneous power of a phase...
Shunt Active Power Filters (APFs) are suitable to compensate current-type harmonics generated by nonlinear load, but large power and high compensation precision is difficult to be obtained due to low switching frequency of high power switch devices e.g. IGBTs and phase lag of digital control loop. In this paper, a high equivalent switching frequency is obtained in spite of low real switching frequency...
Planar busbars have played a significant role in reducing the parasitic/stray inductance in modern high power converters, which is caused by physical current path loop from the IGBT to DC capacitors. Consequently, it may lead to such problems as non-ideal converter operation, over-voltages, voltage drop, current unbalance and resonance with DC capacitors as well as snubber capacitors, especially applied...
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