scholarly journals An Adaptive Backstepping Sliding Mode Cascade-Control Method for a DC Microgrid Based on Nonlinear Virtual Inertia

Electronics ◽  
2021 ◽  
Vol 10 (24) ◽  
pp. 3100
Author(s):  
Jingfeng Mao ◽  
Xiaotong Zhang ◽  
Tengfei Dai ◽  
Aihua Wu ◽  
Chunyun Yin
Keyword(s):  
Control Method ◽  
Sliding Mode ◽  
Cascade Control ◽  
Adaptive Backstepping ◽  
Dc Microgrid ◽  
Voltage Variation ◽  
Variation Rate ◽  
Virtual Inertia ◽  
Bus Voltage ◽  
Inertia Control

In order to improve the bus voltage robustness of distributed multi-source DC microgrid, a new cascade control method based on nonlinear virtual inertia and adaptive backstepping sliding mode is proposed. Firstly, the mathematical model of distributed multi-source DC microgrid with a buck–boost interface converter is analyzed and established. A nonlinear virtual inertia control method based on a variable droop coefficient is given by introducing the converter output voltage variation rate feedback term and a saturation function equation. Secondly, the voltage and current double closed-loop cascade controller is designed by using backstepping sliding mode control and adaptive algorithms. Finally, the system and cascade control models are built in MATLAB/Simulink for multi-case simulation. The feasibility and effectiveness of the proposed method is verified by comparing the results with traditional control methods.

scholarly journals A Virtual Inertia-Based Power Feedforward Control Strategy for an Energy Router in a Direct Current Microgrid Application

Energies ◽  
2019 ◽  
Vol 12 (3) ◽  
pp. 517 ◽  
Author(s):  
Yuyang Li ◽  
Qiuye Sun ◽  
Danlu Wang ◽  
Sen Lin
Keyword(s):  
Direct Current ◽  
Control Strategy ◽  
Control Method ◽  
Low Voltage ◽  
Feedforward Control ◽  
Voltage Fluctuation ◽  
Dc Microgrid ◽  
Power Load ◽  
Virtual Inertia ◽  
Bus Voltage

Due to the uncertainty of the power load and the randomness of distributed generations, low-voltage direct current (LVDC) bus voltage fluctuation will greatly affect the safety of an energy router-enabled direct current (DC) microgrid. In this paper, a power feedforward control strategy based on a dual active bridge (DAB) DC/DC converter in an energy router-based DC Microgrid is proposed. Based on this strategy, the LVDC bus voltage is controlled by virtual inertia control of the DC microgrid, instead of by the DAB converter. Thus, two benefits of the proposed strategy can be achieved: the power feedforward control can be realized, to mitigate the voltage fluctuation range of the LVDC bus; and the modulation algorithm in the DAB converter can be simplified. Experimental results verify the correctness and effectiveness of the proposed control method.

scholarly journals A Novel Command-Filtered Adaptive Backstepping Control Strategy with Prescribed Performance for Photovoltaic Grid-Connected Systems

2020 ◽  
Vol 12 (18) ◽  
pp. 7429
Author(s):  
Weiming Zhang ◽  
Tinglong Pan ◽  
Dinghui Wu ◽  
Dezhi Xu
Keyword(s):  
Control Strategy ◽  
Control Method ◽  
Sliding Mode ◽  
Tracking Error ◽  
Uncertain System ◽  
Voltage Regulation ◽  
Adaptive Backstepping ◽  
Power Fluctuation ◽  
Prescribed Performance ◽  
Bus Voltage

With the aim of solving the power fluctuation and bus voltage instability problems caused by external environment variations in the photovoltaic grid-connected system, a prescribed performance-based adaptive backstepping controller is proposed for the system to regulate the bus voltage and the inverter current. First, the mathematical model of the grid-connected inverter is established, in which the uncertain system parameters are estimated via a designed projection-based adaptive law. Then, the command-filtered backstepping sliding mode control method is applied to the system for power regulation. In order to achieve favorable tracking performance, the prescribed performance technique is introduced in the voltage regulation strategy by constraining the compensated voltage tracking error within a certain range from a novel point of view. Finally, the simulation is carried out considering the variations of environmental situations, and the obtained results demonstrate the sound performance of the prescribed performance-based control strategy with respect to the photovoltaic grid-connected system.

scholarly journals Robust Control Method for DC Microgrids and Energy Routers to Improve Voltage Stability in Energy Internet

Energies ◽  
2019 ◽  
Vol 12 (9) ◽  
pp. 1622 ◽  
Author(s):  
Haochen Hua ◽  
Yuchao Qin ◽  
Hanxuan Xu ◽  
Chuantong Hao ◽  
Junwei Cao
Keyword(s):  
Power Transmission ◽  
Control Method ◽  
Voltage Regulation ◽  
Normal Operation ◽  
Local Network ◽  
Linear Matrix ◽  
Dc Microgrid ◽  
Voltage Stabilization ◽  
Energy Internet ◽  
Bus Voltage

The energy internet (EI) is a wide area power network that efficiently combines new energy technology and information technology, resulting in bidirectional on-demand power transmission and rational utilization of distributed energy resources (DERs). Since the stability of local network is a prerequisite for the normal operation of the entire EI, the direct current (DC) bus voltage stabilization for each individual DC microgrid (MG) is a core issue. In this paper, the dynamics of the EI system is modeled with a continuous stochastic system, which simultaneously considers related time-varying delays and norm-bounded modeling uncertainty. Meanwhile, the voltage stabilization issue is converted into a robust H ∞ control problem solved via a linear matrix inequality approach. To avoid the situation of over-control, constraints are set in controllers. The problem of finding a balance between voltage regulation performance and constraints for the controllers was also extensively investigated. Finally, the efficacy of the proposed methods is evaluated with numerical simulations.

Distributed virtual inertia control and stability analysis of dc microgrid

2018 ◽  
Vol 12 (14) ◽  
pp. 3477-3486 ◽  
Author(s):  
Xiaorong Zhu ◽  
Zhiyun Xie ◽  
Shuzhi Jing ◽  
Hui Ren
Keyword(s):  
Stability Analysis ◽  
Dc Microgrid ◽  
Virtual Inertia ◽  
Inertia Control

scholarly journals PV integrated single-phase dynamic voltage restorer for sag voltage, voltage fluctuations and harmonics compensation

2020 ◽  
Vol 11 (1) ◽  
pp. 547
Author(s):  
Toufik Toumi ◽  
Ahmed Allali ◽  
Othmane Abdelkhalek ◽  
Abdallah Ben Abdelkader ◽  
Abdelmalek Meftouhi ◽  
...  
Keyword(s):  
Single Phase ◽  
Control Method ◽  
Sliding Mode ◽  
Power Source ◽  
Voltage Source ◽  
Dynamic Voltage Restorer ◽  
Phase Dynamic ◽  
Voltage Restorer ◽  
Dynamic Voltage ◽  
Bus Voltage

<span>This document proposes a photovoltaic (PV) based single-phase dynamic voltage restoration (DVR) device, it eliminates both sag and swell voltage and compensates for power. The proposed system requires a power source to compensate for the sag/swell voltage. This system has found a simple topology for the DVR that uses PV with two DC-DC boosts converters as the DC power source for the dynamic voltage conservator. The DC/DC boost converter powered by the PV generator is used to increase the voltage to meet the DC bus voltage requirements of the single-branch voltage source inverter (VSI). This system uses renewable energy; saves energy accordingly and supplies power to critical/sensitive loads. The control method used in this work is a Sliding Mode Control (SMC) method and relies on a phase locked loop (PLL) used to control the active filter. The effectiveness of the suggested method is confirmed by the MATLAB/Simulink® simulation results and some prototype experiments. These results show the capacity of the proposed DC link control.</span>

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