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Summary

This study introduces a hybrid control strategy for quasi-Z-source inverters (qZSIs), combining PWM linear control and finite control state model predictive control (FCS-MPC). This approach ensures high-quality power conversion with fast transient responses.

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FCS-MPChybrid control schemesqZSIsingle-phase inverterssingle-phase quasi impedance source inverters

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Area of Science:

  • Electrical Engineering
  • Power Electronics
  • Control Systems

Background:

  • Quasi-Z-source inverters (qZSIs) offer buck-boost capabilities due to their unique DC-side nonlinear impedance network.
  • Controlling qZSIs presents challenges including managing the impedance network, addressing AC/DC variable coupling, and optimizing single-switch power management.

Purpose of the Study:

  • To propose and validate a hybrid control scheme for qZSIs that merges PWM linear control and finite control state model predictive control (FCS-MPC).
  • To demonstrate that this combined strategy achieves superior performance, retaining steady-state accuracy and transient responsiveness.

Main Methods:

  • A hybrid control scheme combining a Pulse Width Modulation (PWM) linear control strategy for steady-state operation.
  • Integration of Finite Control State Model Predictive Control (FCS-MPC) for managing transient states like start-up and reference changes.

Main Results:

  • The proposed hybrid control scheme effectively manages the nonlinear impedance network and dynamic coupling in qZSIs.
  • Experimental validation confirms the achievement of high-quality output waveforms, error-free steady states, and rapid dynamic responses during transients.

Conclusions:

  • The hybrid PWM linear and FCS-MPC control strategy offers a robust solution for qZSI applications.
  • This approach successfully balances steady-state precision with dynamic performance, overcoming typical qZSI control challenges.