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Title: High-performance digital control of UPS inverters
Authors: DENG HENG
Keywords: uninterruptible power systems, power converter, inverters, digital control, learning control, PWM
Issue Date: 8-Dec-2007
Citation: DENG HENG (2007-12-08). High-performance digital control of UPS inverters. ScholarBank@NUS Repository.
Abstract: The focus of this research is to develop advanced digital control techniques with potential for lower cost for UPS inverters capable of higher performance than those currently available. The proposed control solutions fall under two categories: feedback control methods and learning control methods. The proposed feedback control strategies are shown to be able of achieving very good dynamic and steady-state responses with only output voltage and load current sensing. Two types of learning based controllers were investigated: iterative learning based control (ILC) schemes and artificial neural network (ANN) based schemes. It is shown that ILC schemes and the B-spline network controller achieve almost near perfect steady-state performance and fast error convergence.The design guidelines for UPS inverters are also presented. Following a discussion of typical digital implementation issues, two novel PWM methods are proposed to handle the time-delay problem that occur in digital control of inverters. Both these methods can achieve a wide range of duty ratio, independent of the model of inverter.
Appears in Collections:Ph.D Theses (Open)

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