Distributed control of multi‐time scale DC microgrid based on ADRC

Abstract

DC microgrid can obtain high efficiency due to the reduction of power processes from DC to AC at the generation side and from AC to DC at the consumption side. The distributed generators connected to DC-bus via power converters usually have different dynamic characteristics, this leads to a multi-time scale DC microgrid. This study proposes a time scale voltage droop control based on active disturbance rejection control (ADRC). It is not sensitive to system model uncertainties and external disturbances, moreover system dynamics can be tuned explicitly. Based on the proposed control method, a reduced-order model is developed to analyse system stability. Some experimental tests carried out in the authors' laboratory have verified the effectiveness of the proposed method.

Analysis and experimental verification of a multi‐input converter for DC microgrid applications

“…Growing concerns about the environment and depletion of the fossil fuels increase the integration of renewable energy sources (RESs)-based distributed generation (DG) and energy storage systems (ESSs) into the power system [1]. Despite their potential to deliver solutions to these issues, RESs and ESSs, which usually have a direct current (DC) feature in nature, bring also some technical problems and application difficulties since the existing power system is based on alternating current (AC) [1][2][3]. Moreover, without autonomous control capability, it is inevitable to face power quality problems owing to increasing penetration of DG units [1].…”

Improved Current Decoupling Method for Robustness Improvement of LCL-type STATCOM Based on Active Disturbance Rejection Control

“…2 will be transformed into two same ideal 3-order systems. At the same time, according to the third equation in (13), the ''total disturbances'' f q can be compensated by LSEF. According to the first two equations in (13), transfer function ( 14) can be derived by Laplace transformation.…”

“…In the field of electrical engineering, ADRC is studied and applied to maximize the wind power extraction in the wind farm consisted of direct-driven permanent magnet synchronous generator [12]. At the same time, ADRC can also be utilized to achieve multi-time scale control for DC microgrid [13], and applied to sensorless control of internal permanent-magnet synchronous motors [14]. On the other hand, some improved ADRC are proposed to obtain better control effect [15], [16].…”

Coordinated‐control strategy of scalable superconducting magnetic energy storage under an unbalanced voltage condition

“…When the controlled system deviates from the equilibrium point, the PI controller cannot achieve the ideal control effect, and the setting process of PI parameters is relatively complex, which increases the difficulty of design [26]. To obtain better robustness of the system, researchers have proposed nonlinear control strategies for PCS, such as deadbeat control [27], model predictive control [28], and active disturbance rejection control (ADRC) [29]. Among them, the deadbeat control method has a fast dynamic response ability, but it cannot maintain the robustness when the parameter changes; model predictive control struggles to meet the calculation requirements under the small sampling period and to provide the stability proof of the controller [30]; ADRC needs to design a reasonable set of nonlinear functions and corresponding parameters.…”