State-Space Model of Quasi-Z-Source Inverter-PV Systems for Transient Dynamics Studies and Network Stability Assessment

Monjo, Lluís; Sainz, L.; Mesas, J. J.; Pedra, J.

doi:10.3390/en14144150

Cited by 9 publications

(7 citation statements)

References 24 publications

(105 reference statements)

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“…Once again, v SV mA/B/C in ( 7) and ( 8) corresponds to v mA/B/C obtained from (2). Also note that (8) does not contain D 0 because its value is not defined by the reference signals, but is instead controlled by utilizing the timer.…”

Section: Decoupled Svpwm With Two St States Per Switching Period (Dsv...mentioning

confidence: 99%

“…Peak current in each switch (3) I ph (4) /2 + (2I L (5) + ∆I L (6) )/3 (1) In [12] is incorrectly stated that the duty cycle variation of the ZSVM6 is constant. (2) This is considered the worst case (it varies from 2f sw to 6f sw due to the varying duration of active switching states). (3) In [12], the peak current in each switch is incorrectly defined for the ZSVM6 and SBMSV.…”

Section: Proposed Vs Existing Pwm Schemes-a Comparative Studymentioning

confidence: 99%

“…Over the years, they have gained significant attention due to their distinctive features and capabilities, such as the inherent short-circuit protection, continuous input current, easy integration of batteries, and enhanced reliability. These qualities make qZSIs particularly well-suited for low-voltage-fed applications, such as photovoltaic (PV) [2][3][4] or fuel cell-based systems [5,6]. The voltage boost capability of qZSIs is achieved by utilizing an additional, shoot-through (ST) switching state and the input impedance network comprising two inductors, two capacitors, and a diode.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Novel Space-Vector PWM Schemes for Enhancing Efficiency and Decoupled Control in Quasi-Z-Source Inverters

Grgić,

Bašić,

Vukadinović

et al. 2024

Energies

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This paper investigates the development of pulse width modulation (PWM) schemes for three-phase quasi-Z-source inverters (qZSIs). These inverters are notable for their voltage boost capability, built-in short-circuit protection, and continuous input current, making them suitable for low-voltage-fed applications like photovoltaic or fuel cell-based systems. Despite their advantages, qZSIs confront challenges such as increased control complexity and a larger number of passive components compared to traditional voltage source inverters (VSIs). In addition, most existing PWM schemes for qZSIs lack the capability for independent control of the amplitude modulation index and duty cycle, which is essential in closed-loop applications. This study introduces innovative space-vector PWM (SVPWM) schemes, addressing issues of independent control, synchronization, and unintentional short-circuiting in qZSIs. It evaluates several established continuous and discontinuous PWM schemes, and proposes two novel decoupled SVPWM-based schemes that integrate dead time and in which the shoot-through occurrence is synchronized with the beginning of the zero switching state. These novel schemes are designed to reduce switching losses and improve qZSI controllability. Experimental validation is conducted using a custom-developed electronic circuit board that enables the implementation of a range of PWM schemes, including the newly proposed ones. The obtained results indicate that the proposed PWM schemes can offer up to 6.8% greater efficiency and up to 7.5% reduced voltage stress compared to the closest competing PWM scheme from the literature. In addition, they contribute to reducing the electromagnetic interference and thermal stress of the related semiconductor switches.

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Section: Decoupled Svpwm With Two St States Per Switching Period (Dsv...mentioning

confidence: 99%

Section: Proposed Vs Existing Pwm Schemes-a Comparative Studymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Novel Space-Vector PWM Schemes for Enhancing Efficiency and Decoupled Control in Quasi-Z-Source Inverters

Grgić,

Bašić,

Vukadinović

et al. 2024

Energies

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“…In order to achieve an effective qZSI performance control strategy, it is essential to develop a precise dynamic model of the system. Various mathematical models were introduced in the literature to analyze and optimize the performance of the overall system [2], [16]- [18]. Also, the feedback control strategies for qZSI have been the subject of investigation in several recent scholarly works [17], [19]- [24].…”

Section: Introductionmentioning

confidence: 99%

Maximum power point tracking and space vector modulation control of quasi-z-source inverter for grid-connected photovoltaic systems

Jaoide,

El Aamri,

Outazkrit

et al. 2024

IJECE

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The quasi-Z-source inverter (qZSI) become one of the most promising power electronic converters for photovoltaic (PV) applications, due to its capability to perform a buck-boost conversion of the input voltage in a single stage. The control strategy based maximum power point tracking (MPPT) and proportional integral (PI) controller are well known in grid-connected with traditional configuration but not in qZSI. This paper presents a control strategy for qZSI grid-connected based on the MPPT algorithm and the linear control by PI controllers. This is complemented by the capability to efficiently transfer the harvested power to the grid, ensuring a unity power factor. The proposed control strategy effectively separates the control mechanisms for the direct current (DC) and alternating current (AC) sides by utilizing the two control variables, the shoot-through duty ratio and the modulation index. An adapted space vector modulation technique is then utilized to generate the switching pulse width modulation (PWM) signals, using these two control variables as inputs. The proposed approach was tested and validated under MATLAB/Simulink and PLECS software.

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“…The commonly utilized SPWMs in this group are the simple boost control [4], the maximum boost control [4], and the maximum constant boost control [5]. The second group [6][7][8] comprises SPWMs which allow the D 0 value to vary regardless of the m a value as long as the D 0 value is lower than the maximum allowed, which is, in turn, defined by the applied m a value [5]. In [6], the ST state signal is generated based on the comparison of two dc reference signals (positive and negative) with the carrier signal.…”

Section: Introductionmentioning

confidence: 99%

Semiconductor Losses Calculation of a Quasi-Z-Source Inverter with Dead-Time

Grgić

Vukadinović

Bašić

et al. 2022

Int. j. electr. comput. eng. syst. (Online)

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A quasi-Z-source inverter (qZSI) belongs to the group of single-stage boost inverters. The input dc voltage is boosted by utilizing an impedance network and so called shoot-through (ST) states. In pulse-width modulations utilized for the qZSI, the dead-time is commonly omitted. However, unintended ST states inevitably occur as a result of this action, due to the non-ideality of the switching devices, causing the unintended voltage boost of the inverter and an increase in the switching losses. Hence, the implementation of the dead-time is desirable with regard to both the controllability and efficiency of the qZSI. This paper deals with the calculation of semiconductor losses of the three- phase qZSI with implemented dead time. An algorithm available in the literature was utilized for that purpose. The algorithm in question was originally proposed and applied for the qZSI with omitted dead-time, where the occurrence of unintended, undetected ST states combined with the errors in the switching energy characteristics of the insulated gate bipolar transistor (IGBT) provided by a manufacturer led to errors in the obtained results. However, these errors were unjustifiably ascribed solely to the errors in the switching energy characteristics of the IGBT. In this paper, a new, corrected multiplication factor is experimentally determined and applied to the manufacturer-provided IGBT switching energies. The newly-determined multiplication factor is expectedly lower than the one obtained in the case of omitted dead time. The loss- calculation algorithm with the new multiplication factor was experimentally evaluated for different values of the qZSI input voltage, the duty cycle, and the switching frequency.

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State-Space Model of Quasi-Z-Source Inverter-PV Systems for Transient Dynamics Studies and Network Stability Assessment

Cited by 9 publications

References 24 publications

Novel Space-Vector PWM Schemes for Enhancing Efficiency and Decoupled Control in Quasi-Z-Source Inverters

Novel Space-Vector PWM Schemes for Enhancing Efficiency and Decoupled Control in Quasi-Z-Source Inverters

Maximum power point tracking and space vector modulation control of quasi-z-source inverter for grid-connected photovoltaic systems

Semiconductor Losses Calculation of a Quasi-Z-Source Inverter with Dead-Time

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