Downloads
Abstract
This paper presents a new load sharing control between paralleled three-phase inverters in an islanded-microgrid based on the line impedance estimation online by the use of the Kalman filter. We can solve the mismatch of power sharing when the line impedance changes due to the temperature and frequency, significant differences of line parameters and requirements of Plug-and-Play mode of inverters connected to the microgrid. Moreover, the paper also presents a new Droop control method working with the line impedance which is different from the Droop traditional algorithm when the line impedance is assumed pure resistance R or pure inductance X. In the paper, the line impedance estimation for parallel inverters uses the least squares method combined with Kalman filter. In addition, secondary control loops are designed to restore the voltage amplitude and frequency of the microgrid by using a combined nominal value SOGI-PLL with generalized integral block and phase lock loop to exactly monitor the voltage magnitude and frequency phase at common PCC. Control model has been simulated in Matlab/Simulink with three voltage source inverters connected in parallel for different ratios of the power sharing. The simulation results have shown the accuracy of the proposed control method. Therefore, the proposed adaptive droop control method based on line impedance estimation can be an alternative one for load sharing control in islanded microgrids.
Issue: Vol 19 No 4 (2016)
Page No.: 45-64
Published: Dec 31, 2016
Section: Engineering and Technology - Research article
DOI: https://doi.org/10.32508/stdj.v19i4.781
Download PDF = 726 times
Total = 726 times
Most read articles by the same author(s)
- Phuong Minh Le, Duy Vo Duc Hoang, Hoa Thi Xuan Pham, Huy Minh Nguyen, Dieu Ngoc Vo, A New Adaptive Control Strategy of active and reactive power sharing in Islanded Microgrids , Science and Technology Development Journal: Vol 19 No 4 (2016)
- Phuong Minh Le, Dai Tan Le, Hoa Thi Xuan Pham, The new power sharing method for threephase parallel inverters with nonlinear loads , Science and Technology Development Journal: Vol 18 No 1 (2015)