Hybrid Buck-Boost Multi Output Quasi Z-Source Converter with Dual DC and Single AC Outputs

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Description

  • Hybrid multi output buck-boost quasi z-source converters (q-ZSCs) capable of giving two dc and one ac outputs simultaneously from a single dc input. One dc and the ac outputs of the proposed multi output q-ZSCs have both buck and boost capability and the other dc output has the property of boosting the input voltage, thereby capable of giving a wide range of voltage gain both for dc and ac outputs. The rationale behind proposing two variants of the hybrid multi output q-ZSCs is to have more flexibility on voltage gains as per the load requirements. The proposed converters are derived from the quasi z-source concept and hence inherit all the properties of q-ZSI which realize buck/boost, singlestage inversion, and power conditioning with improved reliability along with inherent shoot-through protection capability converters can be utilized for various modern multi output DC-DC and DC-AC power conversion applications such as Renewables and the Uninterrupted Power Supplies. Detailed steady state operation, loss/efficiency analysis of the proposed converter and discussion on the hybrid pulse width modulation

Introduction

The proposed buck-boost multi output q-ZSC is able to give two dc outputs with boost and buck-boost capabilities and one ac output with buck-boost capability. It possesses high power density and can be applied to modern electrical applications such as renewables and uninterruptible power supplies (UPS) for households. The outputs of the proposed q-ZSC can be independently regulated making it suitable for various multi output DC-DC and DC-AC power conversion for modern applications such as renewables and uninterruptible power supplies. It is important to mention that the rationale behind proposing two variants of the proposed concept is to give extra flexibility in voltage gain as per the load requirement. Moreover, as the proposed q-ZSCs have been derived from quasi z source concept, they inherit all the characteristics of the qZSIs such as inherent shoot-through protection and improved reliability in contrast to the VSI derived conventional multi output topologies

Existing system

  • Multi output converters discussed in [8]-[13] are predominantly dc/dc converters that only give multiple dc outputs and do not have ac at the output give two simultaneous dc and ac outputs and do not have the provisions of multi dc and ac outputs one ac and one dc outputs. In this case also the ac output is lower than the input voltage. Hybrid multi output converter discussed in [20] gives n-ac and one dc outputs. The hybrid multi output converter discussed in [20] gives one dc with boost capability and the ac outputs are lesser than the input voltage. A dual input dual output Z-source inverter is presented The conventional multioutput converters giving AC as output are derived from the voltage source and current source inverters. Hence, they are prone to electromagnetic interferences (EMI) which may result in shoot through or misgating. These problems need to be addressed strictly.

Diasadvantage of the existing system

  • A dual input dual output Z-source inverter is presented The conventional multi output converters giving AC as output are derived from the voltage source and current source inverters. Hence, they are prone to electromagnetic interferences (EMI) which may result in shoot through or misgating. These problems need to be addressed strictly.

Proposed system

  • Hybrid multi output qZSC converters have been derived from the quasi impedance source network and have the property of giving one boost dc, one buck-boost dc, and one buck-boost ac outputs. It may be observed from Fig. 2(b) that the inverter bridge and the switch (S) positions are interchanged q-ZSCs have the capability to give both buck and boost ac as well as buck and boost dc outputs, unlike the conventional multi output converters q-ZSCs have been derived from quasi z source concept, they inherit all the characteristics of the qZSIs such as inherent shoot-through protection and improved reliability in contrast to the VSI derived conventional multi output topologies. Detailed steady state operation, loss analysis, and discussion on the novel pulse width modulation r closely related conventional multi output topologies has also been carried out. The proposed hybrid multi output qZSC has been validated experimentally on a 310 W prototype for open loop as well as closed loop operation.

Advantages of the proposed system

  • The presence of the quasi z source network makes the converter capable of giving both boost and buck type of AC output. Further, the proposed converters have single stage inversion, and power conditioning with improved reliability.
  • In order to achieve wider flexibility on the voltage gains (for all the three outputs), two variants of the proposed multi-output q-ZSC are presented in the paper. The proposed converters are derived in such a way that all the outputs can be independently controllable and hence regulated output voltages can be achieved. As all the outputs of the multi output converters are independently controllable, the proposed q-ZSCs are suitable and adaptable for the industrial applications. Due to wide range of operation, high power density and various advantages inherited from q-ZSI, the proposed multi output q-ZSCs can be used in various applications including the DC-DC and DC-AC power conversions in renewables, uninterrupted power supplies etc.

Block diagram

Hybrid Buck Boost Multi Output Quasi Z Source Converter with Dual DC and Single AC Outputs

Block diagram? explanation

Input

Concept of this project mainly focus on renewable energy sources? like solar energy, fuelcell source etc.

main circuit

The proposed converters can be utilized for various modern multi output DC-DC and DC-AC power conversion applications such as Renewables and the Uninterrupted Power Supplies. Detailed steady state operation, loss/efficiency analysis of the proposed converter and discussion on the hybrid pulse width modulation is presented

Controller

Brain of the circuit, which will control all the? functions of the circuit, all the modes of this circuit perfectly achieved by the controller

Feedback

For having a stabilized output closed loop data has selected which will transfer the instant values of output data? to the controller.

Output

Delivering energy ports from the output of the circuit being used.

Modules

  • Microcontroller(Arduino uno )
  • Driver board[ there are two functions, one is to isolate the mosfet circuit from microcontroller and other is to amplify the signals from the microcontroller for mosfets]
  • Driver board power supply[supply is taken from main power source by using transformer rectifier circuit]
  • Supply for microcontroller[can take from us cables, or 9v, 12v adaptors should be used]
  • Main power circuit(having active and passive componenets of different rating)

Hardware requirement

  1. Arduino microcontroller
  2. Circuit components

Mosfet switches (irf250, irf840)

  1. Input supply
  2. Output measurement device

Software required

  1. Arduino ide
  2. Matlab (simulink)

Reference

  1. Yuan-mao Ye, Ka Wai Eric Cheng, ?Quadratic boost converter with low buffer capacitor stress,? IET Power Electron., vol. 7, no. 5, pp. 1162? 1170, May 2014.
  2. Zhang Hai Shi, Ka Wai Eric Cheng, Siu Lao Ho, ?Static performance and parasitic analysis of tapped-inductor converters,? IET Power Electron., vol. 7, no. 2, pp. 366?375, Feb. 2014.
  3. Yuan-mao Ye, Ka Wai Eric Cheng, ?Single-switch single-inductor multioutput pulse width modulation converters based on optimized switchedcapacitor,? IET Power Electron., vol. 8, no. 11, pp. 2168-2175, Nov. 2015.
  4. C. Loh, Ding Li, Y. K. Chai, F. Blaabjerg, ?Autonomous Operation of Hybrid Microgrid With AC and DC Subgrids,? IEEE Trans. Power Electron., vol. 28, no. 5, pp. 2214-2223, May 2013.
  5. Eghtedarpour, E. Farjah, ?Power Control and Management in a Hybrid AC/DC Microgrid,? IEEE Trans. on Smart Grid, vol. 5, no. 3, pp. 1494- 1505, May 2014.

 

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