**Zhiping Cheng, Meng Gong, Jinfeng Gao, Zhongwen Li \* and Jikai Si**

School of Electrical Engineering, Zhengzhou University, Zhengzhou 450001, China; zpcheng@zzu.edu.cn (Z.C.); gongmeng8036@163.com (M.G.); jfgao@zzu.edu.cn (J.G.); sijikai527@126.com (J.S.)

**\*** Correspondence: lzw@zzu.edu.cn

Received: 16 September 2019; Accepted: 18 October 2019; Published: 20 October 2019

**Abstract:** In order to improve the stability of direct current (DC) microgrid with constant power loads, a novel virtual inductive approach is proposed in this paper. It is known that the negative impedance characteristic of constant power loads will lead to DC bus voltage fluctuation, which will be more serious when they integrate into the DC microgrid though a large transmission line inductive. For the convenience of analysis, a simplified circuit model of the system is obtained by modeling the distributed resources. Unlike the existing control strategies, the proposed control strategy constructs a negative inductance link, which helps to counteract the negative effects of the line inductive between the power source and the transmission line. Detailed performance comparison of the proposed control and virtual capacitance are implemented through MATLAB/simulink simulation. Moreover, the improved performance of the proposed control method has been further validated with several detailed studies. The results demonstrate the feasibility and superiority of the proposed strategy.

**Keywords:** direct current (DC) microgrid; stability; constant power loads; large transmission line inductive; simplified circuit model; virtual negative inductance
