A Modulation Method for Leakage Current Reduction in a Three-Phase Grid-Tie Quasi-Z-Source Inverter

Noroozi, Negar; Yaghoubi, M.; Zolghadri, Mohammad Reza

doi:10.1109/tpel.2018.2868799

Cited by 25 publications

(16 citation statements)

References 29 publications

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“…The main advantages of the qZSI are continuous input current and reduced voltage rating of one of the capacitors in the impedance network. The main disadvantages of the Z-source-related topologies compared to the combination of the dc-dc boost converter and VSI are the lower efficiency [6] and the electromagnetic interference and safety problems due to the leakage current [7].…”

Section: Introductionmentioning

confidence: 99%

Calculation of Semiconductor Power Losses of a Three-Phase Quasi-Z-Source Inverter

et al. 2020

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This paper presents two novel algorithms for the calculation of semiconductor losses of a three‑phase quasi-Z-source inverter (qZSI). The conduction and switching losses are calculated based on the output current‑voltage characteristics and switching characteristics, respectively, which are provided by the semiconductor device manufacturer. The considered inverter has been operated in a stand‑alone operation mode, whereby the sinusoidal pulse width modulation (SPWM) with injected 3rd harmonic has been implemented. The proposed algorithms calculate the losses of the insulated gate bipolar transistors (IGBTs) and the free-wheeling diodes in the inverter bridge, as well as the losses of the impedance network diode. The first considered algorithm requires the mean value of the inverter input voltage, the mean value of the impedance network inductor current, the peak value of the phase current, the modulation index, the duty cycle, and the phase angle between the fundamental output phase current and voltage. Its implementation is feasible only for the Z-source-related topologies with the SPWM. The second considered algorithm requires the instantaneous values of the inverter input voltage, the impedance network diode current, the impedance network inductor current, the phase current, and the duty cycle. However, it does not impose any limitations regarding the inverter topology or switching modulation strategy. The semiconductor losses calculated by the proposed algorithms were compared with the experimentally determined losses. Based on the comparison, the correction factor for the IGBT switching energies was determined so the errors of both the algorithms were reduced to less than 12%.

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Section: Introductionmentioning

confidence: 99%

Calculation of Semiconductor Power Losses of a Three-Phase Quasi-Z-Source Inverter

et al. 2020

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“…However, these inverters have a complex structure and increase the cost of the inverter system. The qZSI in [25] was introduced to decrease the leakage current of the system. Nevertheless, a notch filter must be used and the CMV of the inverter is not reduced compared with the conventional SVM method.…”

Section: Introductionmentioning

confidence: 99%

Modulation Technique for Modified Active Quasi-Z-Source Inverter with Common-Mode Voltage Reduction

Nguyen

Choi

2021

Electronics

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In Z-source topologies, a high-amplitude common-mode voltage can occur when shoot-through states are inserted. In this study, a new space vector pulse-width modulation for an active quasi-Z-source topology is proposed to operate at a high modulation index and reduce the common-mode voltage to one-third of the DC-link voltage. Moreover, the quality of the output voltage is improved by operation with a high modulation index and decreasing the switching loss of the H-bridge switches. The detailed operating principles of the active quasi-Z-source topology using the proposed space vector modulation (SVM) method are presented. A simulation model was built, and an experimental prototype was verified to correct the theoretical analysis.

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“…Similarly, the ZS four-leg inverter was presented in [35] to achieve constant CMV with complex control and high cost. The CMV reduction based on PWM modification for the three-phase qZSI was studied in [36]- [37]. The odd vectors were used to keep CMV constant, and the modulation index is really low in this method [36].…”

Section: Introductionmentioning

confidence: 99%

“…The odd vectors were used to keep CMV constant, and the modulation index is really low in this method [36]. The method introduced in [37] can effectively reduce the leakage current. However, a notch filter should be added to the system, and the CMV waveform is not improved so much when compared with the conventional SVM method.…”

Section: Introductionmentioning

confidence: 99%

Modulation Techniques for a Modified Three-Phase Quasi-Switched Boost Inverter With Common-Mode Voltage Reduction

et al. 2020

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In a single-stage buck-boost quasi-switched boost inverter (qSBI), the shoot-through state insertion causes high amplitude common-mode voltage. Consequently, the qSBI becomes less attractive in transformerless photovoltaic (PV) systems. In this paper, a novel space vector pulse-width modulation for a modified qSBI is introduced to reduce the magnitude of common-mode voltage and push the modulation index up to 1. By properly choosing the shoot-through interval time, shoot-through states are considered to be inserted for boosting voltage and also reducing the THD value of the output voltage. The mathematical analysis and operating principles of the converter are discussed and verified through PSIM simulations. Finally, an experimental prototype is validated based on a TMS320F28335 DSP microcontroller and a DE0-Nano FPGA digital control platform. INDEX TERMS Z-source inverter, quasi-switched boost inverter, single-stage inverter, common-mode voltage, transformerless PV system, space vector pulse-width modulation.

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A Modulation Method for Leakage Current Reduction in a Three-Phase Grid-Tie Quasi-Z-Source Inverter

Cited by 25 publications

References 29 publications

Calculation of Semiconductor Power Losses of a Three-Phase Quasi-Z-Source Inverter

Calculation of Semiconductor Power Losses of a Three-Phase Quasi-Z-Source Inverter

Modulation Technique for Modified Active Quasi-Z-Source Inverter with Common-Mode Voltage Reduction

Modulation Techniques for a Modified Three-Phase Quasi-Switched Boost Inverter With Common-Mode Voltage Reduction

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