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Preparation of High-Temperature Sample Grids for Cryo-EM

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Robust MPC-based current controller against grid impedance variations for single-phase grid-connected inverters.

Esmaeil Zangeneh Bighash¹, Seyed Mohammad Sadeghzadeh¹, Esmaeil Ebrahimzadeh²

¹Faculty of Electrical Engineering, Shahed University, Tehran, Iran.

ISA Transactions

|October 22, 2018

Summary

This summary is machine-generated.

A new Model Predictive Control (MPC) current controller enhances single-phase inverter stability by robustly managing LCL filter resonances and grid impedance variations without extra components or tuning.

Keywords:

Grid impedance variation Grid-connected inverters Inductor–capacitor–inductor (LCL) filter Model predictive current controller (MPCC)Proportional-resonant (PR) controller

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Area of Science:

Electrical Engineering
Power Electronics

Background:

Single-phase inverters commonly use LCL filters, which can introduce resonance issues due to grid impedance at the Point of Common Coupling (PCC).
These resonances can lead to control loop instability, necessitating robust current controllers insensitive to grid variations.

Purpose of the Study:

To present a simple and robust Model Predictive Control (MPC)-based current controller for single-phase inverters.
To address instability caused by LCL filter resonances and grid impedance variations without increasing controller complexity or cost.

Main Methods:

A Model Predictive Control (MPC) approach is proposed, determining switching states and duty cycles via a cost function and switching table.
This method inherently adapts to grid impedance and LCL filter parameter variations by re-evaluating the optimal switching state each period.

Main Results:

The proposed MPC controller demonstrates robustness against grid impedance variations and LCL filter parameter changes.
Simulations and experimental results show comparable or improved performance against classical Proportional-Resonant (PR) controllers.

Conclusions:

The MPC-based current controller offers a simple, effective, and parameter-tuning-free solution for stable single-phase inverter operation.
This approach mitigates resonance issues and enhances reliability in grid-connected inverter applications.