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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-Functional Bidirectional AC/DC T-type 3-Level Converter for Super UPS is investigated in this paper. The AC/DC converter is used as the interfaced between DC Bus and Energy Source or Load. According to the components (grid, gas turbines, AC loads) connected in AC side, The AC/DC converter operates at AC voltage source mode, Power source mode or DC voltage source mode. A control scheme for the...
In wind power converters, the junction temperature of the power module is the crucial factor which affects its reliability. This paper developed a comprehensive thermal management strategy to improve the operational reliability of a small-scale wind power converter. Theoretical analysis, simulation and frequency conversion experiment are given to verify the effectiveness. And the specific goal of...
Component importance is the key parameter of reliability analysis in power converter. Because of the particularity of topology, the traditional importance evaluation methods are not completely suitable for power converter. Based on complex network theories, the topology of power converter can be transformed to a complex network, and a method to evaluate component importance is proposed by using importance...
LED has promised to replace conventional light sources with impressive economic and environmental saving because of the realization of high efficiency and long life time light sources. Reliability issue is a key factor affecting the lighting quality and life time of LED lighting system. Each LED system includes two major aspects; optical and electrical driver. The LED driver is one of the weakest...
To accurately assess the reliability level of wind power converter for doubly fed induction generator (DFIG) system, an assessment methodology for power cycling capabilities of insulated gate bipolar transistor (IGBT) modules is investigated for wind power converter. First, power losses and junction temperatures calculation models of IGBT module are presented, the junction temperature calculation...
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