scholarly journals Hierarchical Coordinated Control Method for Multiload DC Microgrid Units

2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
Zhigang Zhang ◽  
Jinping Mo
Keyword(s):  
Power Supply ◽  
Control Structure ◽  
Control Method ◽  
Hierarchical Control ◽  
Dc Microgrid ◽  
Large Power ◽  
Electrical Grid ◽  
High Expenditure ◽  
Bidding Mechanism ◽  
And Control

Electricity has become not merely a source of power but also a vital component of our lives in a rapidly changing world. However, according to a World Bank report, 17% of the globe’s population live without power. The key cause for such a huge population not being electrified is the proximity of the central electrical grid system or the high expenditure of installing the grid lines to such remote areas. The notion of a microgrid was first proposed more than a decade ago, but the numerous obstacles it entails have hampered its broad adoption and made it a research focus in recent years. A hierarchical control structure of the microgrid is designed, which is divided into layers according to the control objectives and control time scales of the microgrid, and the hierarchical control structure is realized by using multiagent technology. In the framework of hierarchical control, aiming at the demand of energy coordination and optimization of the microgrid, the operation strategy of the microgrid is proposed in grid-connected and/or off-grid mode. In the grid-connected mode, the large power grid is used for power supply and in the off-grid mode, the load bidding mechanism is introduced to ensure the power supply of important loads. Experiment results reveal the power quality and stability of the system.

A Study on Multistage Coordination and Control Strategy for JiBei Grid Considering Wind Power Fluctuation

2014 ◽  
Vol 635-637 ◽  
pp. 1194-1198
Author(s):  
Jian Fei Xu ◽  
Yu Jie Xu ◽  
Feng Lu ◽  
Dun Nan Liu ◽  
Peng Yuan Li
Keyword(s):  
Wind Power ◽  
Power Supply ◽  
Control Method ◽  
Hierarchical Control ◽  
Clean Energy ◽  
Control Area ◽  
Power Fluctuation ◽  
Wind Fluctuation ◽  
And Control ◽  
Coordination And Control

The establishment of independent control area for JiBei grid will improve the flexibility of regulation for local units, and absorb more wind power and other clean energy. However, due to the high proportion of wind power capacity and the fluctuation and intermittent of wind power, it presents a challenge to the power supply safety. In this paper, based on the prediction of regulation demand and regulation speed in different time scales, dynamic hierarchical control method is proposed. Several strategies of hierarchical control under the emergency of steady climbing, reverse and fluctuations are established. Hence, it improves the capacity of power supply safety and the proportion of wind absorption. Finally, based on the measurement of characteristics of wind fluctuation, the value of reserve capacity in different control levels is calculated.

scholarly journals A Comprehensive Motivation of Multilayer Control Levels for Microgrids: Synchronization, Voltage and Frequency Restoration Perspective

2020 ◽  
Vol 10 (23) ◽  
pp. 8355
Author(s):  
Ronald Jackson ◽  
Shamsul Aizam Zulkifli ◽  
Mohamed Benbouzid ◽  
Suriana Salimin ◽  
Mubashir Hayat Khan ◽  
...  
Keyword(s):  
Control Method ◽  
Control Strategies ◽  
Renewable Energy Sources ◽  
Hierarchical Control ◽  
Control Level ◽  
Point Of View ◽  
Power Sharing ◽  
Grid Synchronization ◽  
Future Prediction ◽  
And Control

The current paradigm in integrating intermittent renewable energy sources into microgrids presents various technical challenges in terms of reliable operation and control. This paper performs a comprehensive justification of microgrid trends in dominant control strategies. It covers multilayer hierarchical control schemes, which are able to integrate seamlessly with coordinated control strategies. A general overview of the hierarchical control family that includes primary, secondary, tertiary controls is presented. For power sharing accuracy and capability, droop and non-droop-based controllers are comprehensively studied to address further development. The voltage and frequency restoration techniques are discussed thoroughly based on centralized and decentralized method in order to highlights the differences for better comprehend. The comprehensive studies of grid synchronization strategies also overviewed and analyzed under balanced and unbalanced grid conditions. The details studies for each control level are displayed to highlight the benefits and shortcomings of each control method. A future prediction from the authors’ point of view is also provided to acknowledge which control is adequate to be adopted in proportion to their products applications and a possibility technique for self-synchronization is given in this paper.

scholarly journals A Method for the Autonomous Control of Lower Limb Exoskeletons for Persons With Paraplegia

2012 ◽  
Vol 6 (4) ◽  
Author(s):  
Hugo A. Quintero ◽  
Ryan J. Farris ◽  
Michael Goldfarb
Keyword(s):  
Experimental Data ◽  
User Interface ◽  
Lower Limb ◽  
Control Structure ◽  
Control Method ◽  
Autonomous Control ◽  
Control Architecture ◽  
Powered Exoskeleton ◽  
And Control

This paper describes a control method for a lower limb powered exoskeleton that enables a paraplegic user to perform sitting, standing, and walking movements. The different maneuvers are commanded by the user based on postural information measured by the device. The proposed user interface and control structure was implemented on a powered lower limb orthosis, and the system was tested on a paraplegic subject with a T10 complete injury. Experimental data is presented that indicates the ability of the proposed control architecture to provide appropriate user-initiated control of sitting, standing, and walking. The authors also provide a link to a video that qualitatively demonstrates the user's ability to independently control basic movements via the proposed control method.

Hierarchical Control System for PV Microgrid Applications

2014 ◽  
Vol 644-650 ◽  
pp. 224-229
Author(s):  
Shen Qing Li ◽  
Tian Jun Xu ◽  
Bin Zhang ◽  
Jun Yang
Keyword(s):  
Hierarchical Control ◽  
Coordination Control ◽  
Dc Microgrid ◽  
Simulink Simulation ◽  
Voltage Variation ◽  
Micro Grid ◽  
Dc Bus ◽  
Bus Voltage ◽  
Battery Energy ◽  
And Control

DC microgrid can effectively play to the value and benefits of the distributed power supply, communication than micro grid-connected have the ability to stronger more flexible refactoring and therefore become a new trend micro grid-connected technology research. Based on photovoltaic DC microgrid as example, this paper aimed at the DC microgrid voltage stability problem, proposes a layered coordination control DC bus voltage, the method is based on the detection and control of DC bus voltage variation to coordinate photovoltaic battery energy storage interface, net side interface and the interface converter works, ensure that under different conditions can keep the grid-connected in active power balance. Using Matlab/Simulink simulation and experimental verification, the results verified the effectiveness and feasibility of the method.

Integrated Control of Active Suspension System and Active Front Steering System Using Hierarchical Control Method

2009 ◽  
Author(s):  
Weihua Zhang ◽  
Wuwei Chen ◽  
Hansong Xiao ◽  
Hui Zhu
Keyword(s):  
Control Method ◽  
Lower Layer ◽  
Integrated Control ◽  
Hierarchical Control ◽  
Active Suspension ◽  
Steering System ◽  
Vehicle Control ◽  
Suspension System ◽  
Active Front Steering ◽  
And Control

Integrated vehicle control has been an important research topic in the area of vehicle dynamics and control in recent years. The aim of integrated vehicle control is to improve the overall vehicle performance including handling, stability and comfort through creating synergies in the use of sensor information, hardware, and control strategies. This paper proposes a two-layer hierarchical control architecture for integrated control of active suspension system (ASS) and active front steering system (AFS). The upper layer controller is designed to coordinate the interactions between the ASS and the AFS. While in the lower layer, the two controllers including the ASS and the AFS, are developed independently to achieve their local control objectives. Simulation results show that the proposed hierarchical control system is able to improve both the ride comfort and the lateral stability compared to the non-integrated control approach.

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