A vector control technique for medium-voltage multilevel inverters

Rodríguez, José; Morán, L.; Correa, Pablo; Silva, César

doi:10.1109/tie.2002.801235

Cited by 169 publications

(69 citation statements)

References 8 publications

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“…In the first approach, the switching losses are lower, but the harmonics in the output voltage waveform appear at lower frequencies. For high power and low dynamic systems, low frequency strategies, such as Selective Harmonic Elimination (SHE) [24], Space Vector Control (SVC) [25], and nearest level control (NLC) [26] are applied. In the second approach, the harmonics are multiples of the switching frequency and their sidebands.…”

Section: Achmi Structure and Modulationmentioning

confidence: 99%

Multifunctional Control Strategy for Asymmetrical Cascaded H-Bridge Inverter in Microgrid Applications

Mortezaei

Simões

Bubshait

et al. 2017

IEEE Trans. on Ind. Applicat.

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A multifunctional control strategy for a singlephase Asymmetrical Cascaded H-Bridge Multilevel Inverter (ACHMI), suitable for microgrid systems with nonlinear loads, is presented. The primary advantage of ACHMI is to produce a staircase output voltage with low harmonic content utilizing unequal DC voltages on the individual H-bridge cells. In gridconnected mode of operation, the control strategy of the ACHMI is based on the Conservative Power Theory (CPT), providing selective disturbing current compensation besides injecting its available energy. In autonomous mode of operation, two different control methods along with a damping resistor in the filter circuit are developed for regulation of the ACHMI instantaneous output voltage in a variety of load conditions. The first method is a single-loop voltage control scheme without the need of any current measurement. The second one is multi-loop voltage control scheme with a load current feed-forward compensation strategy and preservation of the grid-connected current control scheme. The steady state response and stability of both voltage control schemes are analyzed, and based on the application requirement, the control schemes are implemented individually. The effectiveness of each control strategy is experimentally verified using a hardware-in-the-loop (HIL) setup with the control algorithm implemented in the TMSF28335 DSP microcontroller.

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Section: Achmi Structure and Modulationmentioning

confidence: 99%

Multifunctional Control Strategy for Asymmetrical Cascaded H-Bridge Inverter in Microgrid Applications

Mortezaei

Simões

Bubshait

et al. 2017

IEEE Trans. on Ind. Applicat.

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“…Popular methods include sinusoidal Pulse Width Modulation (PWM), Space Vector Modulation [57], and Selective Harmonic Elimination [58].…”

Section: Control Scheme For a Multilevel Convertermentioning

confidence: 99%

An integrated multilevel converter with sigma delta control for LED lighting

Gerber

Kline

Sanders

et al. 2017

2017 IEEE Applied Power Electronics Conference and Exposition (APEC)

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High brightness LEDs have become a mainstream lighting technology due to their efficiency, life span, and environmental benefits. As such, the lighting industry values LED drivers with low cost, small form factor, and long life span. Additional specifications that define a high quality LED driver are high efficiency, high power factor, wide-range dimming, minimal flicker, and a galvanically isolated output. The flyback LED driver is a popular topology that satisfies all these specifications, but it requires a bulky and costly flyback transformer. In addition, its passive methods for cancelling AC power ripple require electrolytic capacitors, which have been known to have life span issues. This dissertation details the design, construction, and verification of a novel LED driver that satisfies all the specifications. In addition, it does not require a flyback transformer or electrolytic capacitors, thus marking an improvement over the flyback driver on size, cost, and life span.This dissertation presents an integrated circuit (IC) LED driver, which features a pair of generalized multilevel converters that are controlled via sigma-delta modulation. The first is a multilevel rectifier responsible for power factor correction (PFC) and dimming. The PFC rectifier employs a second order sigma-delta loop to precisely control the input current harmonics and amplitude. The second is a bidirectional multilevel inverter used to cancel AC power ripple from the DC bus. This ripple-cancellation module transfers energy to and from a storage capacitor. It uses a first order sigma-delta loop with a preprogrammed waveform to swing the storage capacitor voltage. The system also contains an output stage that powers the LEDs with DC and provides for galvanic isolation. The output stage consists of an H-bridge stack that connects to the output through a small toroid transformer.The IC LED driver was simulated and prototyped on an ABCD silicon test chip. Testing and verification indicates functional performance for all the modules in the LED driver. The driver exhibits moderate efficiency at half voltage. Although the part was only testable to half voltage, loss models predict that its efficiency would be much higher at full voltage. The driver also meets specifications on the line current harmonics and ripple cancellation.This dissertation introduces multilevel circuit techniques to the IC and LED research 2 space. The prototype's functional performance indicates that integrated multilevel converters are a viable topology for lighting and other similar applications.i Dedication Dedicated to my family and friends, who have been unwavering in their love and support.ii

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“…However, as the modelling shows and the analysis of nonlinear circuits with nonsinusoidal voltage and currents waveforms shows, and as it can be seen in the data of some publications, for example, in [11], the low value of voltage THD itself does not guarantee enough low value of a current THD. The main reason of this appears from the fact that the load, as a rule, is not purely active, and itself has a filtering effect on the current.…”

Section: Thementioning

confidence: 99%

Virtual instrument for non-conventional total harmonic distortion factors evaluation

Lopatkin

Chernov

2016

2016 International Siberian Conference on Control and Communications (SIBCON)

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The importance and the physical meaning of the integral and differential factors of the voltage (and current) harmonics are highlighted. The core part of the LabVIEW virtual instrument for the evaluation of the voltage harmonics integral factors is presented. The simulating LabVIEW verification by means of the meander signal has been accomplished. Keywords-voltage and current harmonics, THD, weighted THD, n-order voltage harmonics integral factors, n-order voltage harmonics differential factors, LabVIEW, virtual instrument

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A vector control technique for medium-voltage multilevel inverters

Cited by 169 publications

References 8 publications

Multifunctional Control Strategy for Asymmetrical Cascaded H-Bridge Inverter in Microgrid Applications

Multifunctional Control Strategy for Asymmetrical Cascaded H-Bridge Inverter in Microgrid Applications

An integrated multilevel converter with sigma delta control for LED lighting

Virtual instrument for non-conventional total harmonic distortion factors evaluation

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