Control and Protection of The Droop-Controlled Grid-Connected Solar Inverter with The Ability of Low Voltage Ride-Through

Document Type : Original Article

Author

Electrical Engineering Department, Malayer University, Malayer, Hamedan, Iran

Abstract

In this paper a new control scheme is proposed to protect the two-stage grid-connected solar inverter with ability of balanced Low Voltage Ride-Through (LVRT). In the proposed scheme, the power injection to the grid is regulated by controlling the voltage/frequency produced by the inverter. In the grid voltage drop condition , the solar inverter has the ability to inject reactive power into the grid in proportion to the voltage drop magnitude, and the inverter output voltage reference is determined by the droop control. To limit the inverter output current in the grid voltage drop condition, with the aim of maintaining the stability, an modified floating voltage drop characteristic has been proposed. Also, in the proposed scheme, a new integrated power tracking algorithm is presented, which in addition to tracking the maximum power in normal conditions, in the drop voltage conditions, if there is no empty capacity in the inverter to inject reactive power, it reduces the received power from the solar cells to allows the inverter to be protected against excessive current increase. The efficiency of the proposed method is shown by the time domain simulation in the MATLAB/SIMULINK environment and implementation in the way of processor in the loop

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TABRIZ JOURNAL OF ELECTRICAL ENGINEERING

Articles in Press, Corrected Proof
Available Online from 28 September 2024

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