Current Control Strategy for Grid Connected Photovoltaic Inverter via LCL Filter

Rihab Mahjoub Essefi(1*), Mansour Souissi(2), Hsan Hadj Abdallah(3)

(1) Université de Sfax, Ecole Nationale d’Ingénieurs de Sfax (ENIS), Control and Energy Management Laboratory (CEM_lab), Route Soukra km 3.5- BP N° 1173- 3038 Sfax, Tunisia
(2) Université de Sfax, Ecole Nationale d’Ingénieurs de Sfax (ENIS), Control and Energy Management Laboratory (CEM_lab), Route Soukra km 3.5- BP N° 1173- 3038 Sfax, Tunisia
(3) Université de Sfax, Ecole Nationale d’Ingénieurs de Sfax (ENIS), Control and Energy Management Laboratory (CEM_lab), Route Soukra km 3.5- BP N° 1173- 3038 Sfax, Tunisia
(*) Corresponding author


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Abstract


This paper presents a method to design a control system for grid connected photovoltaic inverter which has an LCL type filter to suppress the output current total harmonic distortion (THD). In this control system, three linear voltage and current controllers were used in a cascade configuration in order to reduce the complexity of the system. Those controllers regulate the current injected to the grid in a synchronous reference frame which transforms ac variables into dc quantities and thus possibility of applying simple PI regulators. Simulation results, using Matlab/simulink, presented for this strategy confirm the effectiveness of the control scheme in both transient and steady state operation.
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Keywords


Photovoltaic Inverter; LCL Filter; Linear Controller; DQ Transformation; Grid Synchronization

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References


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