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Energies 2018, 11(9), 2418; https://doi.org/10.3390/en11092418

Inertial and Damping Characteristics of DC Distributed Power Systems Based on Frequency Droop Control

1
College of Mechanical and Electrical Engineering, Sichuan Agricultural University, Yaan 625014, China
2
School of Automation, Nanjing Institute of Technology, Nanjing 211167, China
3
Department of Electrical Engineering, The Hong Kong Polytechnic University, Kowloon, Hong Kong, China
4
Guangdong Key Laboratory of Clean Energy Technology, South China University of Technology, Guangzhou 510640, China
*
Author to whom correspondence should be addressed.
Received: 20 July 2018 / Revised: 21 August 2018 / Accepted: 10 September 2018 / Published: 12 September 2018
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Abstract

With high penetration of renewable energy, DC distributed power systems (DDPSs) need to improve the inertia response and damping capacity of the power grid. The effects of main circuit parameters and control factors on the inertia, damping and synchronization of the DDPS were studied in this paper. Firstly, the dynamic model of DDPSs based on frequency droop control is established in the DC voltage control (DVC) timescale. Then, a static synchronous generator (SSG) model is used to analyze the parameters that affect the inertial level, damping effect and synchronization capability of the DDPS. The analysis results show that an optimal design of the frequency droop coefficient and proportional integral (PI) parameters of the DC bus voltage control loop can equivalently change the characteristics of inertia and damping when the frequency droop control strategy is applied to the DC/DC converter and the DC bus voltage control strategy is used in the grid-tied inverter. Simulation results verify the correctness of the conclusions. This paper helps to design an effective control strategy for DDPSs to enhance the inertial level and damping effect of the power grid and to improve the stable operation capability of renewable energy systems. View Full-Text
Keywords: frequency droop control; DC distributed power systems (DDPSs); inertia response; damping effect; DC voltage control (DVC) timescale frequency droop control; DC distributed power systems (DDPSs); inertia response; damping effect; DC voltage control (DVC) timescale
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Xiu, L.; Xiong, L.; Yang, P.; Kang, Z. Inertial and Damping Characteristics of DC Distributed Power Systems Based on Frequency Droop Control. Energies 2018, 11, 2418.

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