NDLI: Output voltage control of a four-leg inverter based three-phase UPS

Content Provider	IEEE Xplore Digital Library
Author	Hava, A.M. Demirkutlu, E.
Copyright Year	2007
Description	Author affiliation: Middle East Tech. Univ., Ankara (Hava, A.M.; Demirkutlu, E.)
Abstract	An all scalar PWM and control approach for the four-leg inverter based three phase transformerless UPS is proposed. The output voltage of each phase is controlled independently and its controller is formed by a stationary frame resonant filter bank accompanied with proportional control and output capacitor current based active damping loops. The resonant filter bank consists of the fundamental component controller and one controller for each dominant harmonic. The simple to implement scalar control method exhibits superior overall steady-state and dynamic performance in the UPS application. Utilizing the inverter zero- state partitioning, a generalized form of scalar PWM for the four-leg inverter is developed. A novel minimum loss discontinuous PWM (MLDPWM) method, which provides minimum switching losses under all operating conditions (including unbalanced load operation) is derived. This simple scalar method provides superior performance and unlike the vector methods it is easy to implement. The controller and modulator design and implementation details for the system are given. Linear and nonlinear loads for balanced and unbalanced load operating conditions are considered. The scalar control and PWM methods are proven by means of theory, simulations, and thorough laboratory experiments of a 5 kVA UPS system.
Starting Page	1
Ending Page	10
File Size	1534513
Page Count	10
File Format	PDF
ISBN	9789275815108
DOI	10.1109/EPE.2007.4417442
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2007-09-02
Publisher Place	Denmark
Access Restriction	Subscribed
Rights Holder	EPE Association
Subject Keyword	Damping active damping unbalanced load Capacitors Pulse width modulation Four-leg inverter voltage regulation zero sequence Voltage control filter bank THD UPS Filter bank harmonic resonant filter scalar control VSI Uninterruptible power systems Pulse width modulation inverters Proportional control scalar PWM Phase transformers Resonance dynamic response crest factor
Content Type	Text
Resource Type	Article

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