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The operation principle of the dc power flow controller in the dc grid is presented, the impacts of the dc voltage and line equivalent resistance on dc power flow are analyzed. Based on these studies, a new dc power flow controller based on dual active bridge (DAB) topology is proposed accordingly in this paper. Compared with existing literatures, the proposed dc power flow controller is able to control...
DC grid technology is one of the effective methods for collecting, transmitting and accommodating large-scale renewable energy over long-distance. Voltage source converter (VSC) based DC grid technology has become a preferred technical scheme because of its inherent advantages, such as flexible bi-directional DC power control capability. However, VSC based DC grid is also facing many operation control...
DC substation with three and more terminals is an important element for interconnected DC grid. This paper aims to explore the configurations and operation strategy of DC substation. A series of DC substation topologies have been derived in duality of classical AC substations. Among the derived counterparts, ring type DC substation is selected and developed for integrating two DC windfarms with two...
DC grid is considered to be one of the efficient technologies to collect and transmit large-scale renewable energy. The paper investigates the coordinated control and operation issues of a DC grid equipped with energy storage system for renewable energy integration, and proposes the coordinated control strategies of start up/shut down and normal operation of such a DC grid. The steady and smooth power...
Multi-voltage-level DC transmission technology has been proposed to integrate large offshore wind farms in this paper. The DC/DC converters are needed to interconnect the DC grids with different voltage levels or realize DC power regulation. A DC grid with four DC/DC converters and one DC hub is configured in this paper to integrate and transmit offshore wind power from different regions. The DC/DC...
The wind power collection using DC grid technology has been considered as one of effective solutions for large offshore wind power collection. The paper analyses the technical requirements for collection of large offshore wind farm power using DC grid technology, and studies the typical DC collection grids for offshore wind power equipped with the wind turbine of DC power output type, then builds...
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