A novel phase-shifted pulse width amplitude modulation for extended-boost quasi-Z source cascaded multilevel inverter based on photovoltaic power system

Yi, Lingzhi; Gui, Qingzhong; Wang, Zhen

doi:10.1063/1.5058754

Cited by 5 publications

(5 citation statements)

References 30 publications

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“…During tr, ir1 and ir2 fully discharge MOSFETs`output capacitors and make the voltage decrease from Ui to 0 V, while the RMS currents and conduction loss are influenced by td. With above consideration, td should be in the range of [5,6]…”

Section: Dead Timementioning

confidence: 99%

“…For photovoltaic applications, the input voltage varies with the irradiation, then the converters should have the ability to operate in wide input voltage. Phase shifted full-bridge (PSFB) [4,5] and LLC resonant converter [6][7][8][9][10] are commonly used for wide input voltage applications, because the attractive merits of wide voltage gain and soft-switching. However, the lagging switches make PSFB lose the soft-switching at the light load.…”

Section: Introductionmentioning

confidence: 99%

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Modified Two-Channel LLC Resonant Converter With Optimal Efficiency for Wide Input Voltage Applications

2023

IEEE Access

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A modified two-channel LLC resonant converter with optimal efficiency for wide input voltage applications. The converter has the same voltage gain and power handing ability as conventional full-bridge (FB) resonant converter, but the hardware cost is lower than conventional FB resonant converter, and the operational frequency range is narrower than conventional resonant converter for the same working condition. It has the characteristics of low input impedance at low input voltage, which is used to provide high voltage gain, and high input impedance at high input voltage, which is used to provide low voltage gain, the above characteristics are analyzed and optimized to improve the efficiency for photovoltaic applications where wide voltage gain is require. A 1 kW prototype is developed, the input voltage ranges from 80 V to 200 V, the output voltage and output power are 400 V and 1 kW, the experimental result shows that the full-load efficiency can reach 96.5% over the entire input voltage range, and the peak efficiency can reach 96.9% at full-load state.INDEX TERMS resonant converter; photovoltaic; wide input voltage; high efficiency; DC/DC conversion.

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Section: Dead Timementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Modified Two-Channel LLC Resonant Converter With Optimal Efficiency for Wide Input Voltage Applications

2023

IEEE Access

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“…Therefore, the design of improved QZS network parameters is mainly to reduce the 2 ω components to the required range. The 2 ω components of each state variable of the system can be expressed as [16]:

({, \begin{aligned} \tilde{U_{C 1}} = \frac{2 ω L}{4 L C ω^{2} - {false(1 - 3 D false)}^{2}} ∙ \frac{M I_{normalO}}{2} ∙ \sin false(2 ω t - ϕ false) \\ \tilde{U_{C 2}} = \frac{2 ω L}{4 L C ω^{2} - {false(1 - 3 D false)}^{2}} ∙ \frac{M I_{normalO}}{2} ∙ \sin false(2 ω t - ϕ false) \\ \tilde{U_{C 3}} = \frac{4 ω L}{4 L C ω^{2} - {false(1 - 3 D false)}^{2}} ∙ \frac{M I_{normalO}}{2} ∙ \sin false(2 ω t - ϕ false) \\ \tilde{U_{C 4}} = \frac{2 ω L}{4 L C ω^{2} - {false(1 - 3 D false)}^{2}} ∙ \frac{M I_{normalO}}{2} ∙ \sin false(2 ω t - ϕ false) \\ \tilde{i_{L 1}} = \tilde{i_{L 2}} = \tilde{i_{L 3}} = \frac{false(1 - 3 D false)}{4 L C ω^{2} - {false(1 - 3 D false)}^{2}} \cdot \frac{M I_{normalO}}{2} \cdot \cos false(2 ω t - ϕ false) \end{aligned})

…”

Section: Improved Qzs Three‐phase Dmcmentioning

confidence: 99%

Direct matrix converter based on improved quasi‐Z source network

Zou

Guo

Wang

et al. 2020

IET power electron.

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This study proposes a three‐phase direct matrix converter (DMC) topology based on an improved quasi‐Z source (QZS) network. The proposed topology shows the following features: (i) Improve the voltage transmission ratio of traditional DMC. (ii) The voltage and current on the output side can be affected by the input side to the minimum, which minimises the harmonic content of the output current. (iii) Due to the existence of the improved QZS network, the three bidirectional switches of each output phase bridge arm are turned‐on at the same time, which improves the reliability of the system. (iv) The improved QZS network has an input LC filter function, and no additional filter circuit is required on the input side. This study analyses the topological structure of the improved QZS‐DMC and elaborates its boost working principle. On this basis, an improved dual space vector modulation strategy with shoot‐through zero vector is proposed, which can effectively reduce the loss of the switch tube and improve the output waveform quality of the converter. Simulation and experimental results verify the proposed topology and strategy.

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“…5 As the actions to improve the quality of an inverter require additional system parts that cause increasing design density, cost, and complexity, the design of the inverter is quite important considering the optimality criterion. 6 Various type three-phase inverters based on pulse width modulation (PWM) [7][8][9] and pulse amplitude modulation (PAM) [10][11][12] techniques are studied well in the literature for decades. Because of the easy application and control of these PWM-and PAM-type inverters, considerable numbers of studies are done for these inverters.…”

Section: Introductionmentioning

confidence: 99%

“…Various type three‐phase inverters based on pulse width modulation (PWM) 7–9 and pulse amplitude modulation (PAM) 10–12 techniques are studied well in the literature for decades. Because of the easy application and control of these PWM‐ and PAM‐type inverters, considerable numbers of studies are done for these inverters.…”

Section: Introductionmentioning

confidence: 99%

A novel three‐phase buck‐boost inverter controlled by an open‐loop assisted closed‐loop hybrid control method

Yalçın

2021

Circuit Theory & Apps

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Summary A novel general purpose three‐phase buck‐boost inverter without need of additional filtering units is presented in this study. The proposed inverter topology is built with moderate numbers of elements in terms of the operation advantages and qualities. The buck‐boost converter‐based structure provides obtaining wide‐range output voltage amplitudes lower or higher than the input voltages. A novel hybrid control method that is open‐loop assisted closed‐loop control is proposed for the inverter operation to improve the response performance on various input and output operation conditions. The wye‐connected modular structure of the proposed inverter topology also enables unbalanced three‐phase operation and single‐phase operation for each phase with independent phase voltages and frequencies. An experimental laboratory setup is built for the proposed three‐phase inverter for 0–50 Hz, 0–100 Vp, and 1.5 kW operation values for real‐time application tests. Simulation tests are also applied for the inverter. The obtained results for both the simulation and the experimental tests show that the presented inverter with the proposed hybrid control method is capable of operating in balanced/unbalanced three‐phase and independent single‐phase modes while producing close to sine wave output voltages under 5% THD levels with wide range desired amplitudes and frequencies on different operating points.

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A novel phase-shifted pulse width amplitude modulation for extended-boost quasi-Z source cascaded multilevel inverter based on photovoltaic power system

Cited by 5 publications

References 30 publications

Modified Two-Channel LLC Resonant Converter With Optimal Efficiency for Wide Input Voltage Applications

Modified Two-Channel LLC Resonant Converter With Optimal Efficiency for Wide Input Voltage Applications

Direct matrix converter based on improved quasi‐Z source network

A novel three‐phase buck‐boost inverter controlled by an open‐loop assisted closed‐loop hybrid control method

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