Generalized Sag Control Strategy for Isolated Island Microgrid Clusters Based on Rotation Coordinate Transformation

doi:10.11985/2020.01.003

Abstract

Abstract:

The microgrid clusters is composed of multiple power supply and load clusters, and its control design is complicated. The influence of tie line impedance between isolated island microgrid clusters on their interactive power control is analyzed. In view of the infeasibility of using generalized droop control strategy directly for microgrid clusters, an improved generalized droop control strategy based on microgrid clusters structure transformation is proposed in consideration of simplified microgrid clusters structure and tie line impedance constraint. Based on the coordinate rotation theory, this strategy can realize power decoupling control, frequency adjustment and active power equalization under arbitrary line impedance ratio, thus ensuring the stability of the operation of the microgrid clusters and improving the dynamic response of the system. Finally, the proposed control strategy is simulated and analyzed, and the simulation results prove the feasibility of the proposed control strategy.

Key words: Microgrid clusters, droop control, generalized droop control, active divide

CLC Number:

TM71

ZHANG Ruixuan,ZHOU Niancheng,MENG Xiaoxiao. Generalized Sag Control Strategy for Isolated Island Microgrid Clusters Based on Rotation Coordinate Transformation[J]. Journal of Electrical Engineering, 2020, 15(1): 23-28.

Figures/Tables 11

References 18

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参数		数值
LC滤波器电感L_f_1,1-L_f_3,3/H		2×10^-3
LC滤波器电阻R_f_1,1-R_f_3,3/Ω		0.03
分布式电源线路电阻R_c_1,1-R_c_3,3/Ω		0.03
分布式电源线路电感L_c_1,1-L_c_3,3/H		2×10^-3
DG_1-1、DG_1-2有功下垂系数k_p_1-1,k_p_1-2/(rad/W)		11.5×10^-5
DG_1-1、DG_1-2无功下垂系数k_q_1-1,k_q_1-2(rad/W)		0.45×10^-3
DG_3-1、DG_3-2有功下垂系数k_p_3-1,k_p_3-2/(rad/W)		12.5×10^-5
DG_3-1、DG_3-2无功下垂系数k_q_3-1,k_q_3-2/(rad/W)		0.5×10^-3
DG_2-1、DG_2-2、DG_2-3有功下垂系数 k_p_2-1,k_p_2-2,k_p_2-3/(rad/W)		12×10^-5
DG_2-1、DG_2-2、DG_2-3无功下垂系数k_q_2-1,k_q_2-2,k_q_2-3/(rad/W)		0.5×10^-3
微网联络线路阻抗Z_line₁₂	R₁₂/Ω X₁₂/H	0.053 67 1.124 12
微网联络线路阻抗Z_line₂₃	R₂₃/Ω X₂₃/H	0.053 67 1.124 12
微网联络线路阻抗Z_line₃₁	R₃₁/Ω X₃₁/H	0.035 68 0.747 32