A FPGA-Based Generalized Pulse Width Modulator for Three-Leg Center-Split and Four-Leg Voltage Source Inverters

Dai, Ningyi; Wong, Man-Chung; Ng, Fan; Han, Yi

doi:10.1109/tpel.2008.921103

Cited by 73 publications

(6 citation statements)

References 22 publications

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“…However, as the imbalance rate of the load increases, the current flowing to the neutral line increases, which occurs a voltage imbalance problem at the dc-link stage. As a result, it causes problems such as imbalance of output voltage and increased voltage distortions [1][2][3][4][5][6][7][8]. The 4-leg inverter can be applied with the space vector pulse width modulation (SVPWM) algorithm even if a leg is added, which makes switching control easy and the dc-link voltage utilization ratio high [9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Output Voltage Imbalance Compensation Using dc Offset Voltage for Split dc-Link Capacitor 3-Leg Inverter

et al. 2021

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In this paper, we analyzed the output voltage imbalance and the cause of the offset voltage in 3-phase 3-leg inverters by using Millman’s theory. Based on this result, we proposed a voltage imbalance compensation algorithm using the dc offset voltage that appeared at the neutral point voltage of the load. To apply the proposed imbalance compensation algorithm, it needs a circuit structure of 3-phase 4-wire such as split dc-link capacitor 3-leg inverter and 4-leg inverter. Therefore, the total harmonic distortion (THD) of the load phase current according to the imbalance rate of the load was analyzed for the two inverters. Then, PSIM simulation and experiments based on a 10 kW-prototype of split dc-link capacitor 3-leg inverter were implemented to verify the validity of the proposed imbalance compensation algorithm.

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Section: Introductionmentioning

confidence: 99%

Output Voltage Imbalance Compensation Using dc Offset Voltage for Split dc-Link Capacitor 3-Leg Inverter

et al. 2021

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“…There has been a substantial increasing trend in control strategy investigations on three-phase four-leg inverters, including the carrier-based pulse width modulation (PWM) [22,23], space vector modulation algorithm [24,25], and digital predictive control [26,27]. Firstly, a minimally switched control algorithm is studied, which can minimize switching operations and monitor the current polarity for three-phase four-leg inverter [28].…”

Section: Introductionmentioning

confidence: 99%

Design and Evaluation of an Efficient Three-Phase Four-Leg Voltage Source Inverter with Reduced IGBTs

Luo

Liu

et al. 2017

Energies

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This paper presents a new three-phase four-leg voltage source inverter (VSI), which achieves a high cost effectiveness for mega-watt level system applications. The proposed four-leg inverter adopts the integrated topology with thyristors and insulated-gate bipolar transistors (IGBTs), which aims to reduce the number of IGBTs. In order to handle the zero sequence current, a neutral leg via incorporating IGBTs is artfully integrated with the regular phase legs. Furthermore, the modelling principles are elaborated and analyzed, which emphasizes switching states and voltage vectors in six segments based on the states of thyristors. Finally, by using the carrier-based pulse width modulation (PWM) method, the closed-loop current control of the proposed inverter is verified by both simulation and experimentation. a three-phase four-leg inverter is reported in [29], where the lower order nontriplen harmonics are eliminated by using Fourier-based equations on line-to-line basis as conventional SHE technology to express the control signals of three legs. In addition, two methods that mitigate the load neutral point voltage (LNPV) for three-phase four-leg inverters are analyzed, which are based on the PWM strategy and the common mode filter, respectively [30]. Moreover, a decoupled sequence control strategy, employing positive sequence, negative sequence, and zero sequence controllers is studied in [31].However, the available publications on three-phase four-leg inverters are limited to eightinsulated-gate bipolar transistors (IGBTs) topologies, as illustrated in Figure 1a. In mega-watt level applications, the IGBT with a rated current of thousands of ampere is not cost-effective and is not suitable for some cost-sensitive situations.

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“…Three-phase voltage source inverters (VSIs), used in many applications such as active power filters [9,11], distributed generation systems [8], and PWM rectifiers [12], have two main ways of providing a neutral connection for three-phase four-wire systems [8,10,13]: 1) a relatively simple approach of using two capacitors to split the DC link and tie the neutral point to the midpoint of the two capacitors [14,15]; and 2) using a four-leg inverter topology and tying the neutral point to the midpoint of the fourth leg [13,16,17].…”

Section: Introductionmentioning

confidence: 99%

Model-reference sliding mode control of a three-phase four-leg voltage source inverter for stand-alone distributed generation systems

Özdemir¹,

Yazıcı²,

Erdem

2015

Turk J Elec Eng & Comp Sci

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This paper proposes a discrete-time model-reference sliding mode control of three-phase four-leg voltage source inverters for stand-alone distributed generation systems. Three-phase four-leg voltage source inverters (VSIs) are used in a broad area. A discrete-time model-reference sliding mode controller, having superior advantages such as insensitivity to external disturbances, system parameter variations, and modeling errors, is applied to control the output voltage of three-phase four-leg VSIs. As a new study, the discrete-time model-reference sliding mode control with a supplemented output feedback integral controller is proposed so that the controlled output voltages of the VSI tracks the input reference signal. The controller is designed using the augmented discrete-time error dynamics presented in this paper and is applied to control the output voltage control of a three-phase four-leg based uninterruptable power supply.It is shown that the output voltage of the VSI controlled by the proposed method is accurately regulated for various load conditions such as linear balanced/unbalanced, nonlinear balanced/unbalanced, and instantaneous load changes. The robustness of the proposed method against variations by 20%-50% in R, L, and C filter parameters and 5 different cases are showed.

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A FPGA-Based Generalized Pulse Width Modulator for Three-Leg Center-Split and Four-Leg Voltage Source Inverters

Cited by 73 publications

References 22 publications

Output Voltage Imbalance Compensation Using dc Offset Voltage for Split dc-Link Capacitor 3-Leg Inverter

Output Voltage Imbalance Compensation Using dc Offset Voltage for Split dc-Link Capacitor 3-Leg Inverter

Design and Evaluation of an Efficient Three-Phase Four-Leg Voltage Source Inverter with Reduced IGBTs

Model-reference sliding mode control of a three-phase four-leg voltage source inverter for stand-alone distributed generation systems

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