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.
Highlights
In recent years, with the rapid development of power electronics, the proportion of power electronic equipment in the power grid has increased dramatically, and the effective control of electrical energy has become increasingly inseparable from the converter operation
Paper, the the dynamic dynamic model model conducive of the based on the model was established in the timescale, analyzing the intrinsic of the distributed power systems (DDPSs) based on the synchronous generator (SSG) model was established in the DC voltage control (DVC) timescale, analyzing the intrinsic mechanism, mainly mainly affecting affecting the the parameters parameters and and influential influential laws laws of of the the inertial inertial level level and and damping damping mechanism, effect of of the the DDPS
DDPSs with frequency droop control are determined by the structural parameters, control parameters and steady-state operating points
Summary
With the rapid development of power electronics, the proportion of power electronic equipment in the power grid has increased dramatically, and the effective control of electrical energy has become increasingly inseparable from the converter operation. Based on grid-tied inverter control and energy scheduling algorithms, VSG allows the DDPS to simulate the large inertia and strong damping characteristics of RSG [13,14,15]. In [20], the static synchronous generator (SSG) model was proposed to effectively analyze the inertia and damping characteristics of the grid-tied inverter system based the double closed-loop control. The SSG model is a prospective and effective method to analyze the inertia and damping characteristics of DDPSs, while no work in this prospective direction has been done in other papers so far.
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