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Bipolar DC system provides flexible connection and decreased line-to-ground voltage level at the expense of potential voltage unbalance between positive pole and negative pole. Voltage balancer works as “Dependent Voltage Source” to eliminate the unbalance voltage. It is a critical grid-forming component for bipolar system. Considering the need of system expansion and “N+1” redundancy design, bipolar...
In this paper, the concept of P-Z-N distributed bipolar DC system is proposed in differentiation with existing PN distributed bipolar DC system. Such configuration enables each pole with independent operation capability and shows higher system reliability. Operation of P-Z-N distributed bipolar system involves coordination of PZ sub-microgrid and ZN sub-microgrid. In comparison with voltage balancer...
Large Offshore wind farms are planned in China and some are under constructions. DC grid or multi-terminal HVDC is the promising technology to delivery large offshore wind power over long distances. DC grid voltage levels need to be built to design optimal DC grid, without this voltage levels, DC grid may be sub-optimal, not cost-effective. This paper proposes the study framework of building voltage...
Multi-MW wind power converters are widely applied in wind power field. Converters are paralleled to expand converter's capacity. Due to the wind power fluctuation, IGBT's power handling ability together with its drive power is fluctuating largely and rapidly, which will cause a large temperature variation, affecting the reliability and lifetime of power semiconductors. In this paper, the thermal smooth...
Multi-MW wind power converter's reliability is a key issue for the whole wind power generation system. Due to wind power fluctuation, IGBT's handling power is fluctuating largely and rapidly, which will cause a large junction temperature variation of IGBT. Thermal stress is the main factor affecting IGBT's lifetime. In this paper, the adaptive thermal control is proposed to improve IGBT's lifetime...
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