Conference Proceeding

A Protection of the Electrolytic Capacitor-less Drive System against the Input Grid Interruption

Sch. of Electr. Eng. & Comput. Sci., Seoul Nat. Univ.
Conference Record - IAS Annual Meeting (IEEE Industry Applications Society) 11/2006; DOI:10.1109/IAS.2006.256884 pp.2454 - 2458 In proceeding of: Industry Applications Conference, 2006. 41st IAS Annual Meeting. Conference Record of the 2006 IEEE, Volume: 5
Source: IEEE Xplore

ABSTRACT This paper presents a protection strategy for the semiconductor switches in an electrolytic capacitor-less converter. The proposed protection strategy can prevent them from breaking down of the semiconductors due to the over-voltage stress caused by the regenerative energy flowing from the load to the grid at the moment when the source lines are disconnected by the grid interruption. The energy stored in the inductor may result in excessive over-voltage in DC bus due to the very small DC capacitance in the electrolytic capacitor-less converter. The energy at q-axis can be dumped to d-axis while the DC bus voltage is maintained within an allowable range by the proposed active current regulation during the interruption. The proposed protection strategy is verified by the experiments with an elevator system which has a 10.8kW, 380V permanent magnet AC motor as a hoist machine

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Keywords

380V permanent magnet AC motor
 
allowable range
 
DC bus
 
DC bus voltage
 
electrolytic capacitor-less converter
 
elevator system
 
excessive over-voltage
 
grid interruption
 
hoist machine
 
over-voltage stress
 
proposed active current regulation
 
proposed protection strategy
 
protection strategy
 
regenerative energy
 
semiconductors
 

Wook-Jin Lee