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Multi-function multi-level grid tied inverter based on a new combined logic-analog controller with capacitors

Vahid Nematzadeh Meinagh1, Mehran Sabahi2, Mohammad Bagher Bannae Sharifian3

  • 1Faculty of Electrical and Computer Engineering, University of Tabriz, Tabriz, Iran. v.nematzadeh@tabrizu.ac.ir.

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A novel hysteresis band controller enhances a five-level grid-tied inverter for efficient power injection and active filtering. This logic-analog controller also balances capacitor voltages, improving overall system performance.

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Area of Science:

  • Electrical Engineering
  • Power Electronics
  • Control Systems

Background:

  • Grid-tied inverters are crucial for renewable energy integration.
  • Existing controllers may lack multi-functionality and efficiency.
  • Capacitor voltage balancing is essential for multilevel inverter stability.

Purpose of the Study:

  • To propose a modified hysteresis band logic-analog controller for a five-level grid-tied inverter.
  • To enable simultaneous power injection, active filtering, and energy storage.
  • To incorporate capacitor voltage balancing capabilities.

Main Methods:

  • Implementation of a hysteresis band controller on a 5-level converter using current injection.
  • Utilizing logic gates for high-speed, time-domain control without complex transformations.
  • Employing switch selection for capacitor voltage balancing.

Main Results:

  • The controller successfully manages power injection and active filtering.
  • Capacitor voltage balancing was achieved, enhancing inverter stability.
  • Simulation and 350W prototype results validated the proposed controller's effectiveness.

Conclusions:

  • The proposed controller offers a high-speed, efficient solution for multi-functional grid-tied inverters.
  • It eliminates the need for microcontrollers, avoiding software delays.
  • The controller demonstrates robust performance in power grid applications.