Title :
The restrain of the dead time effects in parallel inverters
Author :
Zhang, Yu ; Chen, Xikun ; Kang, Yong ; Chen, Jian
Author_Institution :
Coll. of Electr. & Electron., Huazhong Univ. of Sci. & Technol., Hubei
Abstract :
In inverters, the waveform distortions in output voltage caused by the dead times can be successfully compensated by the instantaneous voltage feedback regulators like PI regulator, and this always makes the dead time effects in parallel inverters be ignored. However, for the filter inductances and output impedances in high power inverters must be very small (for consideration of system cost, internal voltage drop and fast dynamic response), the discrepancy of the dead times in power switches of parallel inverters can result in considerable circulating currents, which can hardly be eliminated by the instantaneous voltage feedback regulators and load share regulators. This paper analyzed the dead-time effects on the circulating currents between parallel inverters. The simulations and experiments validated the analysis
Keywords :
PI control; feedback; invertors; power filters; voltage regulators; PI regulator; circulating currents; dead time effects; filter inductances; high power inverters; instantaneous voltage feedback regulators; load share regulators; output impedances; output voltage; parallel inverters; power switches; waveform distortions; Analytical models; Bridge circuits; Costs; Impedance; Output feedback; Power harmonic filters; Pulse width modulation inverters; Reactive power; Regulators; Voltage;
Conference_Titel :
Electric Machines and Drives, 2005 IEEE International Conference on
Conference_Location :
San Antonio, TX
Print_ISBN :
0-7803-8987-5
Electronic_ISBN :
0-7803-8988-3
DOI :
10.1109/IEMDC.2005.195813