Control of Grid-Connected Inverter in Stationary Reference Frame with Harmonic Compensation Capability
Subject Areas : electrical and computer engineering
M.
Shahparasti
1
M.
Mohamadian
2
(Tarbiat Modares University)
A.
Yazdian Varjani
3
(Tarbiat Modares University)
Abstract :
Due to increasing number of inverter based distributed generation resources in electric power systems, improving the quality and performance of them are necessary. In this paper a new current scheme is presented to inject sinusoidal current to the grid with following grid voltage conditions: sinusoidal voltage, distorted voltage and unbalance voltage. The proposed control scheme includes two sections: 1) Determination of sinusoidal reference current considering grid voltage condition; 2) current controller to track reference current. The proposed reference current determination algorithm in comparison with other algorithms, such as Park method is implemented easier and has faster dynamic response. The proposed current controller is implemented in the stationary reference frame and does not require the use of multiple controllers and coordinate transforms to compensate the harmonics. This control strategy needs tuning of only one variable, hence compared with other control methods requires less computational burden for practical implementation. Simulation results confirm the effectiveness of the proposed control method.
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