Dear,

Improved efficiency of power conversion is high priority when it comes to renewable energy applications. Model predictive control (MPC) can be used to optimise the switching pattern applied in the converter to reduce switching losses. During this research the suitability of a direct MPC strategy with long horisons is evaluated for current control of a three-phase two-level grid-tied converter with LCL-filter. A cost function was formulated to include two weighted control objectives, namely reducing the reference tracking error and switching frequency. The grid voltage was incorporated into the state-space model as an additional input vector. Therefore the optimisation approach, used to transform the cost-function minimisation problem towards the integer least-squares (ILS) problem, had to be reworked to consider this additional element, hereby extending on previous work done on the integer quadratic programming formulation for long horisons. A sphere decoding algorithm was incorporated to reduce the computational burden. The current controller shows fast transient response and good reference tracking of the fundamental 50 Hz component. The developed strategy complies to the grid-side current harmonic limits set out in the South African grid code at high switching frequencies, but is unable to comply to the even and high-order harmonic limits at low switching frequencies.

For more details please refer to the thesis intitled : Model Predictive Control of a Grid-Connected Converter With LCL-Filter

• Thesis for: M.Eng Electrical
• Advisor: HdT Mouton; AJ Rix

(PDF) Model Predictive Control of a Grid-Connected Converter With LCL-Filter (researchgate.net)

Dear Siddartha Vermori,

Also i suggest you to see links and attached files on topic.

https://eprints.soton.ac.uk/434553/1/Comparison_of_current_control_strategies.pdf

Thesis Model Predictive Control of a Grid-Connected Converter With LCL-Filter

Best regards

Use 3ph transformer with grounded core