Power Decoupling Control Strategy of Synchronverter Based on Current Feedback

doi:10.11985/2018.08.004

Abstract

Abstract:

Synchronverter has natural friendly characteristics to the grid by simulating the internal mechanism and external feature of the synchronous motor, however, the coupling between active and reactive power intensifies synchronous frequency resonance, triggers power oscillations and results system instability. Therefore, the small signal model of the synchronverter power angle characteristics is firstly established to analyze the production mechanism of the power coupling. Aiming at the problem of power coupling, a new power decoupling control method is proposed. The coupling power is dynamically compensated by adding a feedback current loop, realizing the way that convert the dynamic power quantity which causes the coupling into the form of dynamic current, and eliminating the steady-state error and dynamic power oscillation of virtual synchronization control caused by power coupling. The stability analysis of the control system with feedback current loop is presented. Simulation are given to show the validity and feasibility of the proposed control strategy.

Key words: Synchronverter, power angle characteristics, power coupling, feedback current loop, dynamic current

CLC Number:

TM464

Chen Bing,Zhu Hongzhang,Tao Xuan Wu Jun,Wu Jun. Power Decoupling Control Strategy of Synchronverter Based on Current Feedback[J]. Journal of Electrical Engineering, 2018, 13(8): 18-25.

Figures/Tables 9

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参数	数值
L_s/mH,R_s/Ω	0.45,0.27
C /μF	22
L_g/mH	0.45
直流侧电压V_dc/V	700
电网电压U_g/V	220
D_p	5
D_q	50
K	128.066 2
J/kg·m²	0.000 405 2
电流环PI参数	k_p= 2,k_i= 30