Analysis of an AC-to-DC voltage source converter using PWM with phase and amplitude control

In this paper, a high performance dc link current observer is described and analyzed for a double conversion uninterruptible power system (UPS) or an adjustable speed drive (ASD). This second order observer identifies the dc link current drawn by the output inverter section. The observed load current is then used as a feedforward signal to input converter current regulator section for improving its dynamic response. The new contributions include the analysis on the system observability, observer sensitivity to system parameters, its command tracking performance, dc link voltage and load current dynamic disturbance rejection capabilities, all of which are not found in present literatures. In conjunction with the dc link current observer analysis, the current regulator bandwidth performance of the input ac-dc converter stage is characterized for both single and double update pulse width modulation (PWM) methods. The high performance resides in its fast dynamic response to the load power requirements resulting in dc link voltage variation, without using dc link current sensor or any communication channels. The solution is not only ideal for a stand alone UPS or ASD for low cost and high dynamic performance, but is particularly attractive for ac-dc converters suitable for common dc link systems. The analytical results are verified through the state-of-the-art simulation. All control algorithms are implemented in a Texas Instruments (TI) digital signal processor (DSP) and Xilinx field programmable gate array (FPGA) environment. The experimental setup of a 3-phase, 480V, 60Hz, 15 hp (11.19 kW) active front end (AFE) rectifier system is used for analytical and simulation verifications.

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“…Without the observer the disturbance rejection transfer function is shown in Eq. (16), which is graphically represented in Fig. 10.…”

Section: Disturbance Rejection Analysismentioning

confidence: 99%

“…A three-phase mathematical model for the AFE was derived in [16]. The complexity of the exhaustive model prevents it from being used in practical controller design applications.…”

Section: System Modeling and Analysis A Afe Mathematical Modelmentioning

confidence: 99%

Design Oriented Analysis of DC Link Current Observer of a Three-phase Double Conversion Uninterruptable Power System or Adjustable Speed Drive

Lee

Wallace

Bhadkamkar

2007

APEC 07 - Twenty-Second Annual IEEE Applied Power Electronics Conference and Exposition

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“…This modeling approach is so far valid as long as the input and state variables of the converter vary slowly in time. Other modeling techniques have already been proposed in the literature, such that the averaging technique that is based on equivalent circuit manipulations [12], and the Fourier analysis based modeling approach [15]. Although their differences, they all yields at the same low-frequency representation of the converter.…”

Section: Introductionmentioning

confidence: 98%

“…Thus, in order to simplify the eventual control design procedure, a time-invariant model is elaborated by applying to the former one two transformations: a stationary-torotating frame transformation [15], known as Park transformation, and an input vector nonlinear transformation. The obtained model is more general than the one proposed in [4] and [3] where the neutral is assumed disconnected.…”

Section: Introductionmentioning

confidence: 99%

A study on the effects of the neutral inductor on the modeling and performance of a four-wire three-phase/switch/level fixed-frequency rectifier

Kanaan

Al‐Haddad

Fnaiech

2006

Mathematics and Computers in Simulation

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“…The third approach is based on the switching function concept [6][7]. Although it is more complex and timeconsumer than the averaging technique, this method does not neglect the high frequency operating regime and allows, consequently, to study, on the one hand, the effects of the switching phenomenon on the waveforms of the converter's variables and to analyze, on the other hand, the electromagnetic compatibility of the converter.…”

Section: Introductionmentioning

confidence: 99%

Modeling techniques applied to switch-mode power converters: application to the boost-type single-phase full-bridge rectifier

Kanaan¹,

Al‐Haddad

2008

2008 Conference on Human System Interactions

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In this paper, three modeling techniques that are conventionally used in the derivation of mathematical models for switch-mode DC-DC converters are presented and studied. The state-models obtained by applying these generalcase approaches are valid under both continuous and discontinuous operating modes. The first two methods use averaging process and allow only a low-frequency representation of the converter, whereas the third one, which is based on the using of the switching function concept, gives a mathematical model that is valid in the entire frequency range and has thus more accuracy in computer implementations. For illustration purpose, and in order to show the extendibility of all three modeling approaches to other families of switch-mode converters, a boost-type singlephase full-bridge rectifier is considered. The most-general switching-function-based model is highly suitable for realtime simulations.

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Analysis of an AC-to-DC voltage source converter using PWM with phase and amplitude control

Cited by 289 publications

References 7 publications

Design Oriented Analysis of DC Link Current Observer of a Three-phase Double Conversion Uninterruptable Power System or Adjustable Speed Drive

Design Oriented Analysis of DC Link Current Observer of a Three-phase Double Conversion Uninterruptable Power System or Adjustable Speed Drive

A study on the effects of the neutral inductor on the modeling and performance of a four-wire three-phase/switch/level fixed-frequency rectifier

Modeling techniques applied to switch-mode power converters: application to the boost-type single-phase full-bridge rectifier

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