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. | TAÏP CHÍ PHAÙT TRIEÅN KH&CN, TAÄP 19, SOÁ K7- 2016 New adaptive Droop control with combined line impedance estimation method for parallel inverters Le Minh Phuong – E-mail: lmphuong@ Hoang Vo Duc Duy Pham Thi Xuan Hoa Nguyen Minh Huy Ho Chi Minh City University of Technology, VNU-HCM (Manuscript Received on Octorber 04th, 2016, Manuscript Revised December 08th, 2016) ABSTRACT This paper presents a new load sharing control between paralleled three-phase inverters combined with Kalman filter. In addition, secondary control loops are designed to restore in an islanded-microgrid based on the line impedance estimation online by the use of the the voltage amplitude and frequency of the microgrid by using a combined nominal value Kalman filter. We can solve the mismatch of power sharing when the line impedance changes SOGI-PLL with generalized integral block and phase lock loop to exactly monitor the voltage due frequency, magnitude and frequency phase at common significant differences of line parameters and requirements of Plug-and-Play mode of PCC. Control model has been simulated in Matlab/Simulink with three voltage source inverters connected to the microgrid. Moreover, the paper also presents a new Droop control inverters connected in parallel for different ratios of the power sharing. The simulation method working with the line impedance which is different from the Droop traditional algorithm results have shown the accuracy of the proposed control method. Therefore, the proposed when the line impedance is assumed pure adaptive droop control method based on line resistance R or pure inductance X. In the paper, the line impedance estimation for parallel impedance estimation can be an alternative one for load sharing control in islanded microgrids. to the temperature and inverters uses the least squares method Keywords: Droop control, microgrid, impedance estimation, Kalman filter. 1. INTRODUCTION With the expansion
