New Three-Dimensional Space Vector-Based Switching Signal Generation Technique Without Null Vectors and With Reduced Switching Losses for a Grid-Connected Four-Leg Inverter

Golwala, Heli; Chudamani, R.

doi:10.1109/tpel.2015.2414875

Cited by 37 publications

(17 citation statements)

References 15 publications

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“…Equations (5)- (9) indicate that there is coupling introduced by the transformer between the α axis and β axis. Equations (5) and (6) can be transformed into the two-phase rotating coordinate by the Park transform:…”

Section: Complex State Variable Structure Of Invertermentioning

confidence: 99%

“…There are many kinds of topologies to meet the above requirements, such as the split capacitor inverter (SCI) [1,2], four-leg inverter [3][4][5][6][7][8][9], and neutral point forming transformer (NFT) inverter [10,11]. The split capacitors of SCI not only act as support capacitors, but also provide the route of the unbalanced current and ripple current, which means that split capacitors have a larger volume and weight, and the ripple current in support capacitors and filter capacitors is larger than in other structures, which makes the capacitors be vulnerable to the ripple current.…”

Section: Introductionmentioning

confidence: 99%

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Control Strategy of Three-Phase Inverter with Isolation Transformer

Chen

Qiu

et al. 2019

Energies

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In order to improve the control performance of a train auxiliary inverter and satisfy the requirements of power quality, harmonics, and unbalanced factor, this paper proposed a design method of a double closed-loop control system based on a complex state variable structure. The method simplifies the design process and takes full account of the effects of coupling and discretization. In the current closed-loop process, this paper analyzed the limitations of the proportional integral (PI) controller and simplified to P controller. In the voltage closed-loop, the paper employed the PI controller plus the resonant controller, designed the parameters of the PI controller. and analyzed the optimal discretization method of the resonant controller under dq axis coupling. Finally, experiments and simulations were conducted to show that the proposed method can achieve the above improvements.

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Section: Complex State Variable Structure Of Invertermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Control Strategy of Three-Phase Inverter with Isolation Transformer

Chen

Qiu

et al. 2019

Energies

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“…Based on estimation, it is assumed that the switching power losses are sinusoidal, while Equations (17) and (18) define the sine function peak of E on and E o f f , respectively, at the peak evaluation of the collector current. An approximation of the summation in Equation (19) can be given by the integration as in Equation (20):…”

Section: Switching Lossesmentioning

confidence: 99%

Online Optimal Switching Frequency Selection for Grid-Connected Voltage Source Inverters

et al. 2017

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Enhancing the performance of the voltage source inverters (VSIs) without changing the hardware structure has recently acquired an increased amount of interest. In this study, an optimization algorithm, enhancing the quality of the output power and the efficiency of three-phase grid connected VSIs is proposed. Towards that end, the proposed algorithm varies the switching frequency (f sw ) to maintain the best balance between switching losses of the insulated-gate-bipolar-transistor (IGBT) power module as well as the output power quality under all loading conditions, including the ambient temperature effect. Since there is a contradiction with these two measures in relation to the switching frequency, the theory of multi-objective optimization is employed. The proposed algorithm is executed on the platform of Altera ® DE2-115 field-programmable-gate-array (FPGA) in which the optimal value of the switching frequency is determined online without the need for heavy offline calculations and/or lookup tables. With adopting the proposed algorithm, there is an improvement in the VSI efficiency without degrading the output power quality. Therefore, the proposed algorithm enhances the lifetime of the IGBT power module because of reduced variations in the module's junction temperature. An experimental prototype is built, and experimental tests are conducted for the verification of the viability of the proposed algorithm.

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“…In order to accommodate to unbalanced load, the common modulation strategy for the three-phase four-leg inverter is threedimensional space vector pulse width modulation (3D-SVPWM) with high utilisation of DC voltage and good flexibility, which is presented comprehensively by the authors of [20][21][22][23][24]. The simplified 3D-SVPWM algorithm is proposed by Li et al [20], which alleviates the computation burden of the processor.…”

Section: Introductionmentioning

confidence: 99%

Single‐stage high‐frequency‐isolated three‐phase four‐leg buck–boost inverter with unbalanced load

Zhu

2020

IET Power Electronics

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A three-phase four-leg inverter shows its preponderance on providing energy to unbalanced load and high DC-link utilisation. To increase the power density of the traditional three-phase four-leg inverter with power frequency isolation, this study proposes a single-stage isolated three-phase four-leg inverter. To ensure the symmetry of three-phase output voltages, the proposed converter provides the path for neutral current resulted by the unbalanced load. It achieves buck-boost DC/AC conversion by introducing the transformer whose turns ratio provides additional voltage gain. The working frequency of the transformer is in accord with the switching frequency, so high-frequency electrical isolation is realised with a single-stage structure as well. The specific mode analysis and the relationship between the switching states and the voltage vectors are presented. A modified three-dimensional space vector pulse width modulation algorithm with a simplified section partition method is proposed, which guarantees the voltage-second balance of the transformer within one switching cycle as well. In order to explore the feasibility of the topology and control strategy, the simulation is done by MATLAB/Simulink. Then a prototype was built in the lab and the experimental results verify that the inverter can produce balanced voltages under both balanced and unbalanced load.

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New Three-Dimensional Space Vector-Based Switching Signal Generation Technique Without Null Vectors and With Reduced Switching Losses for a Grid-Connected Four-Leg Inverter

Cited by 37 publications

References 15 publications

Control Strategy of Three-Phase Inverter with Isolation Transformer

Control Strategy of Three-Phase Inverter with Isolation Transformer

Online Optimal Switching Frequency Selection for Grid-Connected Voltage Source Inverters

Single‐stage high‐frequency‐isolated three‐phase four‐leg buck–boost inverter with unbalanced load

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