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Mario Porru Alessandro Serpi Ignazio Marongiu Alfonso Damiano 《Journal of The Franklin Institute》2018,355(2):728-752
Two different control approaches for suppressing DC-link voltage unbalance in Three-Level Neutral-Point Clamped Converters (NPCs) are presented in this paper. They both guarantee DC-link voltage equalization over any NPC operating conditions, i.e. when the NPC feeds or is supplied by the main AC grid at different active and/or reactive power rates. The proposed control approaches consist of either a hysteresis or a proportional regulator, each of which synthesizes the most suitable control action based on the actual DC-link voltage unbalance. Particularly, two different PWM techniques have been developed in order to achieve DC-link voltage equalization successfully, preserving NPC voltage and current waveforms at the same time. The performances achievable by means of both the proposed control approaches have been compared to each other through an extensive simulation study in order to highlight their most important advantages and drawbacks, as well as their effectiveness over any operating conditions. Particularly, both control approaches are validated in the Matlab-Simulink environment referring to DC-link voltage equalization of an NPC that represents the point of common coupling between a DC microgrid and the main AC grid. 相似文献
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在巴西,别送人紫色花;在希腾,别向当地人招手;在澳大利亚,切勿跷起大拇指。环球旅游专家罗杰·艾斯特尔向您道出其中缘由。罗杰·艾斯特尔正为自己在沙特阿拉伯的多次会议取得成功而自我庆祝的时候,他的客户——一名中年商人,也是其公司在该地区的一位重要经销商——突然探身来抓住他的手。“我震惊不已!”艾斯特 相似文献
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