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A series distributed generation (DG) units based islanding microgrid configuration and the corresponding power sharing method are proposed in this paper. Unlike a conventional islanding microgrid where parallel DG units are connected to the point of common coupling (PCC) to supply electricity to loads in a cooperative manner, this paper discusses the possibility of using series connected low voltage...
In a dc microgrid, the bidirectional dc-ac converters are usually operated as a utility interface to control the dc bus voltage and ensure the power balance within the system. In the case of grid failure, power limiting or malfunction condition for dc-ac converters, the dc microgrid will lose its power balance unit. At that time, the distributed generations in dc system will change their operation...
Nowadays there is an increasing interest on dc microgrid for its higher energy efficiency and higher reliability as compared to the ac system. This paper addresses the stability problem in a dc microgrid with master-slave control structure. Considering the discrete sampling and control algorithm in a digital system, the small-signal models of this dc microgrid have been derived in the z plane. Eigenvalue...
Considering different application scenarios and questions to be solved, electromagnetic transient simulation and transient stability simulation are rarely performed simultaneously for the calculation of traditional bulk power system, which are quite different from element modeling to simulation algorithm. But it's not true for the analysis and calculation of microgrid and active distribution system...
DC bus voltage control is an important task in the control of a dc microgrid or hybrid ac/dc microgrid system. To improve the dc bus voltage control dynamics, traditional approaches are mainly based on feeding forward the load or source power. However, in the microgrid system with distributed dc sources and loads, the traditional feedforward based methods need remote measurement or communications...
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