Improved Low Voltage - Ride Through (LVRT) Performance of an Active Distribution Grid by Providing a Bidirectional Converter to Control DC Bus Voltage Ripple
الموضوعات :
afshin kadri
1
(Department of Electrical Engineering, Gorgan Branch, Islamic Azad University, Gorgan, Iran)
Reza Ebrahimi
2
(Department of Electrical Engineering, Gorgan Branch, Islamic Azad University, Gorgan, Iran)
Edris Pouresmaeil
3
(Department of Electrical Engineering and Automation, Aalto University, 02150 Espoo, Finland)
الکلمات المفتاحية: Inverter, renewable energy sources, Low Voltage - Ride Through, Bidirectional converter,
ملخص المقالة :
In today's world, distributed generation sources through grid-connected inverters perform other roles in addition to generating the required load’s power. Among these roles, it is possible to perform the function of the inverter as a virtual synchronous machine in the direction of frequency stability in the presence of a fault, supporting the network in the condition of voltage fault caused by the presence of a fault, and so on. It can be mentioned that doing each of these things, It requires changes in the control system, hardware or new topologies. Supporting the grid in voltage sag conditions, that is called Low Voltage - Ride Through for an inverter, has its own standards and requirements, so meeting them requires new research and designs. In this paper, first, a review of the past work is done and then by presenting a new method, the inverter performance is improved in these conditions. In the presented method, the DC bus ripple will be very low and thus the high order harmonics will be reduced. Also, this ripple is reduced by using a two-way converter and suitable control of the inverter, unlike some of the presented methods that transfer it on the reactive power produced or on the voltage of the solar cell side. Furthermore, in these cases, it is tried to reduce the DC bus ripple to the minimum value of the capacitive capacity of this bus. To evaluate the presented method, simulations have been performed in Simulink / MATLAB software and the results have been presented.
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