Abstract
This paper presents a novel methodology for frequency control of a microgrid through doubly fed induction generator (DFIG) employing battery energy storage system (BESS) and droop control. The proposed microgrid frequency control is the result of the active power injection from the droop control implemented in the grid side converter (GSC) of the DFIG, and the BESS implemented in the DC link of the back-to-back converter also in the DFIG. This methodology guarantees the battery system charge during operation of the connected DFIG in the network, and the frequency control in microgrid operation after an intentional disturbance. In order for the DFIG to provide frequency support to the microgrid, the best-performing droop gain value is selected. Afterwards its performance is evaluated individually and together with the power injected by the battery. The power used for both battery charging and frequency support is managed and processed by the GSC without affecting the normal operation of the wind system. The simulation tests are performed using Matlab/Simulink toolbox.
Highlights
Electric generation from renewable energy sources (RESs) is increasing worldwide according to data registered by international agencies such as International Renewable Energy Agency (IRENA)and World Wind Energy Association (WWEA)
Since the droop control method depends on the available power, which is strongly influenced by the wind speed, simulations were performed to determine the most suitable droop value for different operating points
The droop control implemented in the grid side converter (GSC) together with the battery energy storage system (BESS) connected in the DC
Summary
Electric generation from renewable energy sources (RESs) is increasing worldwide according to data registered by international agencies such as International Renewable Energy Agency (IRENA)and World Wind Energy Association (WWEA). According to [1], in the period from 1997 to 2016, the wind energy increase was 479.5 GW in the world and, as per statistics published by WWEA in 2019 [2], the total installed capacity worldwide until the end of 2018 reached 600 GW, which could supply about 6% of global electricity demand. This increase is largely due to the fact that countries such as China, India, Brazil, and many other markets around the world are implementing wind energy in their electricity matrix. The lack of inertia response of the DFIG associated with the Energies 2020, 13, 894; doi:10.3390/en13040894 www.mdpi.com/journal/energies
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