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Single-phase Z-source PWM AC-AC converters

Single-phase Z-source PWM AC-AC converters,10.1109/LPEL.2005.860453,IEEE Power Electronics Letters,Xu Peng Fang,Zhao Ming Qian,Fang Zheng Peng

Single-phase Z-source PWM AC-AC converters   (Citations: 26)
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The letter proposes a new family of simple topologies of single-phase PWM ac-ac converters with a minimal number of switches: voltage-fed Z-source converter and current-fed Z-source converter. By PWM duty-ratio control, they become "solid-state transformers" with a continuously variable turns ratio. All the proposed ac-ac converters in this paper employ only two switches. Compared to the existing PWM ac-ac converter circuits, they have unique features: providing a larger range of output ac voltage with buck-boost, reversing or maintaining phase angle, reducing in-rush and harmonic current, and improving reliability. The operating principle and control method of the proposed topologies are presented. Analysis, simulation, and experimental results are given using the voltage-fed Z-source ac-ac converter as an example. The analysis can be easily extended to other converters of the proposed family. The proposed converters could be used in voltage regulation, power regulation, and so on.
Journal: IEEE Power Electronics Letters , vol. 3, no. 4, pp. 121-124, 2005
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    • ...The quasi-Z-source ac-ac converter can output either bucked or boosted, either inphase or out-of phase output voltage [13]...
    • ...Applying the volt-seconds balance on two inductors L1 and L2 [13], the voltage transfer gain can be derived in Table I. Moreover, for further analysis, the capacitor voltage stress, inductor current stress and switch stress equations are also derived by using the equivalent circuit mode...

    Qin Leiet al. Four quadrant voltage sag/swell compensation with interphase quasi-Z-s...

    • ...The Z-source ac/ac converters focus on single-phase topologies [21]–[23] and three-phase topologies [22], [24]...
    • ...In applications where only voltage regulation is needed, the family of single-phase Z-source ac/ac converters proposed in [21]–[23] has a number of merits, such as providing a larger range of output voltages with the buck–boost mode, reducing inrush, and harmonic current...
    • ...Since the switching frequency is much higher than the ac source (or line) frequency, the requirements for the inductors and capacitors should be low [23]...

    Minh-Khai Nguyenet al. A Single-Phase Z-Source Buck–Boost Matrix Converter

    • ...The Z-source ac–ac converters focus on single-phase topologies [15], [16] and three-phase topologies [39]...
    • ...Traditional single-phase Z-source PWM ac–ac converters proposed in [15] and [16] have the following features: the output voltage can be bucked-boosted and both in-phase/out-of-phase with the input voltage...
    • ...However, the conventional Z-source PWM ac–ac converters in [15] have a significant drawback: in that the input voltage and output voltage does not share the same ground, thus the feature that the output voltage reverses or maintains its phase angle relative to the input voltage is not supported well...
    • ...Another drawback is that the input current of the conventional single-phase Z-source PWM ac–ac converters in [15] and [16] is operated in the discontinuous current mode (DCM)...
    • ...Fig. 1 shows the conventional single-phase Z-source ac–ac converter in [15] and [16] with the input and output not sharing the ground, and operating in DCM...
    • ...Fig. 1. Conventional single-phase Z-source ac–ac converter topology in [15] and [16] with discontinuous input current and without sharing the ground...
    • ...The output voltage gain has features that have been reported previously in [15] and [16]...
    • ...Table I shows the voltage and current equations in the ideal case (r =0Ω )of the conventional single-phase Z-source ac–ac converter presented in [15] and [16], and the proposed singlephase quasi-Z-source ac–ac converter...
    • ...AC–AC CONVERTER IN [15] AND [16] AND THE PROPOSED SINGLE-PHASE...
    • ...In order to verify the advantages of the proposed single-phase quasi-Z-source ac–ac converter, the PSIM simulation is used in comparison with the conventional single-phase Z-source ac– ac converter presented in [15]...
    • ...The input voltage was 84 Vrm s/60 Hz. In the simulation, the parasitic resistances of L1 and L2 were set to zero (r =0Ω ). Table II provides a list of the parameters used in the simulation of the conventional converter in Fig. 1 [15] and the proposed converter in Fig. 2...
    • ...SIMULATION PARAMETERS OF THE CONVENTIONAL CONVERTER IN FIG. 1 [15]...
    • ...conventional single-phase Z-source ac–ac converter with the same condition, as shown in Table II. Fig. 8 shows the input current of the conventional converter in Fig. 1 [15] and the proposed converter in Fig. 2, when D =0 .25 .F ig. 9s hows the input current of the conventional converter in Fig. 1 [15] and the proposed converter in Fig. 2, when D =0 .7...
    • ...conventional single-phase Z-source ac–ac converter with the same condition, as shown in Table II. Fig. 8 shows the input current of the conventional converter in Fig. 1 [15] and the proposed converter in Fig. 2, when D =0 .25 .F ig. 9s hows the input current of the conventional converter in Fig. 1 [15] and the proposed converter in Fig. 2, when D =0 .7...
    • ...Table III provides the simulation results for the THDi of the input current for the conventional single-phase Z-source ac–ac converter in Fig. 1 [15] and the proposed single-phase quasi-Z-source ac–ac converter in Fig. 2, when D =0 .25 and 0.7...
    • ...In addition, the waveform of the input current in the proposed converter is more sinusoidal than that in the conventional converter presented in [15]...
    • ...Fig. 8. Simulation result for the input current based on a load R and D =0 .25 for (a) conventional converter in Fig. 1 [15] and (b) proposed converter in Fig. 2. (a) Ii =1 0.4 Arms , THDi = 75.14%...
    • ...Fig. 9. Simulation result for the input current based on a load R and D =0 .7 for (a) conventional converter in Fig. 1 [15] and (b) proposed converter in Fig. 2. (a) Ii =4 .3 Arms , THDi = 150.02%...
    • ...IN [15] AND THE PROPOSED SINGLE-PHASE QUASI-Z-SOURCE AC–AC...

    Minh-Khai Nguyenet al. Single-Phase AC–AC Converter Based on Quasi-Z-Source Topology

    • ...Traditional single-phase Z-source PWM AC-AC converters proposed in [4], [5] have the following features: the output voltage can be bucked-boosted and both in-phase/out-of-phase with the input voltage...
    • ...However, the conventional Z-source PWM AC-AC converters in [5] have a significant drawback: in that the input voltage and output voltage does not share the same ground, thus the feature that the output voltage reverses or maintains its phase angle relative to the input voltage is not supported well...
    • ...Another drawback is that the input current of the conventional single-phase Z-source PWM AC-AC converters in [4] and [5] is operated in the discontinuous current mode (DCM)...

    Minh-Khai Nguyenet al. Single-phase quasi-Z-source AC-AC converter with safe-commutation stra...

    • ...In applications, where only voltage regulation is need, the family of single-phase Z-source ac-ac converters proposed in [9, 10] has merits such as providing a larger range of output voltage with buck-boost mode, reducing in-rush and harmonic current...
    • ...Since the switching frequency is much higher than the ac source (or line) frequency, the inductor and capacitor requirement should be low [10]...

    Minh-Khai Nguyenet al. Single-Phase Z-Source Buck-Boost Matrix Converter

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