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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.
Scientific Reports
|December 23, 2025
Summary
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.
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.
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