Bus Voltage Control of DC Distribution Network Based on Sliding Mode Active Disturbance Rejection Control Strategy

Boning Wu,Xuesong Zhou,Youjie Ma

doi:10.3390/en13061358

Boning Wu, Xuesong Zhou + Show 1 more

Open Access

https://doi.org/10.3390/en13061358

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Journal: Energies	Publication Date: Mar 14, 2020
Citations: 3	License type: CC BY 4.0

Affiliation: Tianjin University of Technology

Abstract

The DC distribution network has more advantages in power transmission, grid connection of distributed energy, and reliability of power supply when compared with AC distribution network, but there are still many problems in the development of DC distribution network. DC bus voltage control is one of the hot issues in the research of DC distribution network. To solve this problem, in this paper, a new type of sliding mode active disturbance rejection control (SMADRC) controller for AC/DC converters is designed and applied to the voltage outer loop. The linear extended state observer (LESO) can observe the state variables and the total disturbance of the system. The SMADRC is composed of a sliding mode controller, LESO, and disturbance compensator, which can compensate the total disturbance observed by LESO properly. Therefore, it improves the dynamic. At the same time, it can also reduce the system jitter that is caused by sliding mode controller. The state variables that are observed by the LESO are used in the design of sliding mode controller, which greatly simplifies the design of sliding mode controller. Finally, the simulation results of Matlab/Simulink show that the controller has good start-up performance and strong robustness.

Highlights

In recent years, with the strong support of the government for distributed energy and the development of power electronics technology, increasing distributed energy sources are connected to the power grid, as well as the popularization and promotion of many DC household electrical appliances and the wide application of industrial frequency conversion technology, which make the power supply and load composition of the distribution network change significantly [1,2,3]
The results show that the second-order sliding mode control maintains the robustness of traditional sliding mode control, and reduces the system jitter that is caused by the sliding mode control
The sliding mode active disturbance rejection control (SMADRC) controller that is designed in this paper consists of sliding mode controller, linear extended state observer (LESO), and disturbance compensator

Summary

Introduction

With the strong support of the government for distributed energy and the development of power electronics technology, increasing distributed energy sources (such as wind power generation, photovoltaic power generation and new energy vehicles) are connected to the power grid, as well as the popularization and promotion of many DC household electrical appliances and the wide application of industrial frequency conversion technology, which make the power supply and load composition of the distribution network change significantly [1,2,3]. The AC distribution network is facing many challenges, such as security, stability, and efficiency of power supply, because of the diversity and uncertainty of load and power supply. In response to this phenomenon, the concept of DC distribution network began to be put forward and gradually became a research hotspot. LESO can estimate the state variables and the total disturbance of the system without giving an accurate mathematical model. In the above expression: y is the output of the system, u is the input of the system, ω is the unknown disturbance, the constants a0 , a1 · · · , an−1 are the structural parameters of the system, which might be unknown or partially known, and b is the controller gain. Equation (21) can be transformed into (n + 1) orders extended state space, which is described, as follows:

Methods

Results

Conclusion