scholarly journals Message Queuing Telemetry Transport Communication Infrastructure for Grid-Connected AC Microgrids Management

Energies ◽  
2021 ◽  
Vol 14 (18) ◽  
pp. 5610
Author(s):  
Babak Arbab-Zavar ◽  
Emilio J. Palacios-Garcia ◽  
Juan C. Vasquez ◽  
Josep M. Guerrero
Keyword(s):  
Communication System ◽  
Current Control ◽  
Directional Information ◽  
Power Sources ◽  
Communication Architecture ◽  
Control Structures ◽  
Power Bus ◽  
Technological Advances ◽  
Communication Links ◽  
The Stability

In a context with an increasing number of non-traditional power sources, smart inverters function as the main interfaces between distributed energy resources (DERs) and the power bus. This role is even more prominent in microgrids (MGs), where numerous DERs must be controlled and coordinated. For this aim, MGs need to implement suitable communication links since, even in distributed control, the system must compensate voltage and frequency deviations caused by local controllers. Likewise, a communication system is required to optimize its operation. This paper aims to apply the technological advances brought by the Internet of Things (IoT) to the issue of communication within an MG. The work proposes a wireless communication architecture based on the message queuing telemetry transport (MQTT) protocol, accompanied by a set of requirements and specifications to establish a multi-directional information flow between DERs in an MG, and potential energy management system (EMS) or secondary controllers. A laboratory-scale testbed was implemented to demonstrate the operation of an EMS in the proposed architecture. The experimental results showed how current control structures seamlessly integrate with the proposed communication system. Furthermore, it was demonstrated that communication latencies or failures did not comprise the stability of the MG, but only decreased the optimality of the EMS control strategy.

scholarly journals A Cost-Effective Decentralized Control for AC-Stacked Photovoltaic Inverters

Energies ◽  
2018 ◽  
Vol 11 (9) ◽  
pp. 2262 ◽  
Author(s):  
Hua Han ◽  
Chao Luo ◽  
Xiaochao Hou ◽  
Mei Su ◽  
Wenbin Yuan ◽  
...  
Keyword(s):  
Decentralized Control ◽  
Cost Effective ◽  
Current Control ◽  
Control Mode ◽  
Communication Link ◽  
Grid Voltage ◽  
Point Tracking ◽  
Pv Inverter ◽  
Communication Links ◽  
Voltage Phase

For an AC-stacked photovoltaic (PV) inverter system with N cascaded inverters, existing control methods require at least N communication links to acquire the grid synchronization signal. In this paper, a novel decentralized control is proposed. For N inverters, only one inverter nearest the point of common coupling (PCC) needs a communication link to acquire the grid voltage phase and all other N − 1 inverters use only local measured information to achieved fully decentralized local control. Specifically, one inverter with a communication link utilizes the grid voltage phase and adopts current control mode to achieve a required power factor (PF). All other inverters need only local information without communication links and adopt voltage control mode to achieve maximum power point tracking (MPPT) and self-synchronization with grid voltage. Compared with existing methods, the communication link and complexity is greatly reduced, thus improved reliability and reduced communication costs are achieved. The effectiveness of the proposed control is verified by simulation tests.

scholarly journals A Unified Control Strategy of Distributed Generation for Grid-Connected and Islanded Operation Conditions Using an Artificial Neural Network

2021 ◽  
Vol 13 (11) ◽  
pp. 6388
Author(s):  
Karim M. El-Sharawy ◽  
Hatem Y. Diab ◽  
Mahmoud O. Abdelsalam ◽  
Mostafa I. Marei
Keyword(s):  
Neural Network ◽  
Artificial Neural Network ◽  
Control System ◽  
Distributed Generation ◽  
Control Strategy ◽  
Current Control ◽  
Operating Conditions ◽  
Pi Controllers ◽  
Artificial Neural ◽  
The Stability

This article presents a control strategy that enables both islanded and grid-tied operations of a three-phase inverter in distributed generation. This distributed generation (DG) is based on a dramatically evolved direct current (DC) source. A unified control strategy is introduced to operate the interface in either the isolated or grid-connected modes. The proposed control system is based on the instantaneous tracking of the active power flow in order to achieve current control in the grid-connected mode and retain the stability of the frequency using phase-locked loop (PLL) circuits at the point of common coupling (PCC), in addition to managing the reactive power supplied to the grid. On the other side, the proposed control system is also based on the instantaneous tracking of the voltage to achieve the voltage control in the standalone mode and retain the stability of the frequency by using another circuit including a special equation (wt = 2πft, f = 50 Hz). This utilization provides the ability to obtain voltage stability across the critical load. One benefit of the proposed control strategy is that the design of the controller remains unconverted for other operating conditions. The simulation results are added to evaluate the performance of the proposed control technology using a different method; the first method used basic proportional integration (PI) controllers, and the second method used adaptive proportional integration (PI) controllers, i.e., an Artificial Neural Network (ANN).

scholarly journals In-flight control and communication architecture of the GLORIA imaging limb sounder on atmospheric research aircraft

2015 ◽  
Vol 8 (6) ◽  
pp. 2543-2553 ◽  
Author(s):  
E. Kretschmer ◽  
M. Bachner ◽  
J. Blank ◽  
R. Dapp ◽  
A. Ebersoldt ◽  
...  
Keyword(s):  
Flight Control ◽  
Communication System ◽  
Automation System ◽  
Fourier Transform Spectrometer ◽  
Human Intervention ◽  
Communication Architecture ◽  
Flexible Control ◽  
Atmospheric Research ◽  
Research Aircraft ◽  
Spectral Imager

Abstract. The Gimballed Limb Observer for Radiance Imaging of the Atmosphere (GLORIA), a Fourier-transform-spectrometer-based limb spectral imager, operates on high-altitude research aircraft to study the transit region between the troposphere and the stratosphere. It is one of the most sophisticated systems to be flown on research aircraft in Europe, requiring constant monitoring and human intervention in addition to an automation system. To ensure proper functionality and interoperability on multiple platforms, a flexible control and communication system was laid out. The architectures of the communication system as well as the protocols used are reviewed. The integration of this architecture in the automation process as well as the scientific campaign flight application context are discussed.

scholarly journals Communication architecture of an early warning system

2010 ◽  
Vol 10 (11) ◽  
pp. 2215-2228 ◽  
Author(s):  
M. Angermann ◽  
M. Guenther ◽  
K. Wendlandt
Keyword(s):  
Early Warning ◽  
Early Warning System ◽  
Satellite Communication ◽  
Warning System ◽  
Early Warning Systems ◽  
Lessons Learned ◽  
Warning Systems ◽  
Communication Architecture ◽  
Design And Implementation ◽  
Communication Links

Abstract. This article discusses aspects of communication architecture for early warning systems (EWS) in general and gives details of the specific communication architecture of an early warning system against tsunamis. While its sensors are the "eyes and ears" of a warning system and enable the system to sense physical effects, its communication links and terminals are its "nerves and mouth" which transport measurements and estimates within the system and eventually warnings towards the affected population. Designing the communication architecture of an EWS against tsunamis is particularly challenging. Its sensors are typically very heterogeneous and spread several thousand kilometers apart. They are often located in remote areas and belong to different organizations. Similarly, the geographic spread of the potentially affected population is wide. Moreover, a failure to deliver a warning has fatal consequences. Yet, the communication infrastructure is likely to be affected by the disaster itself. Based on an analysis of the criticality, vulnerability and availability of communication means, we describe the design and implementation of a communication system that employs both terrestrial and satellite communication links. We believe that many of the issues we encountered during our work in the GITEWS project (German Indonesian Tsunami Early Warning System, Rudloff et al., 2009) on the design and implementation communication architecture are also relevant for other types of warning systems. With this article, we intend to share our insights and lessons learned.

scholarly journals Technocenological approach to development of power generation of industrial regions

2021 ◽  
Vol 315 ◽  
pp. 03007
Author(s):  
Ivan Paskar ◽  
Fedor Nepsha ◽  
Gennadij Lebedev
Keyword(s):  
Power Generation ◽  
Low Power ◽  
Distributed Generation ◽  
Energy Security ◽  
Power Grid ◽  
Generation System ◽  
Power Sources ◽  
Industrial Regions ◽  
The Stability ◽  
Generation Facility

The prerequisites for the implementation of distributed generation facilities in the power grid complex of the region are highlighted. A technocenological approach has been chosen for the economically and technically sound implementation of power sources. The procedures for the verification and visualization of the technocenosis were carried out, and the stability of the existing generation system was determined. The analysis of the generating complex with the power units expected to be commissioned has been carried out. It is concluded that it is necessary to install a distributed generation facility of low power to improve energy security.

scholarly journals Coupling Influence on the dq Impedance Stability Analysis for the Three-Phase Grid-Connected Inverter

Energies ◽  
2019 ◽  
Vol 12 (19) ◽  
pp. 3676
Author(s):  
Chuanyue Li ◽  
Taoufik Qoria ◽  
Frederic Colas ◽  
Jun Liang ◽  
Wenlong Ming ◽  
...  
Keyword(s):  
Stability Analysis ◽  
Nyquist Plot ◽  
Current Control ◽  
Impedance Ratio ◽  
Three Phase ◽  
Grid Impedance ◽  
Nyquist Criterion ◽  
Grid Connected Inverter ◽  
The Stability ◽  
The Right

The dq impedance stability analysis for a grid-connected current-control inverter is based on the impedance ratio matrix. However, the coupled matrix brings difficulties in deriving its eigenvalues for the analysis based on the general Nyquist criterion. If the couplings are ignored for simplification, unacceptable errors will be present in the analysis. In this paper, the influence of the couplings on the dq impedance stability analysis is studied. To take the couplings into account simply, the determinant-based impedance stability analysis is used. The mechanism between the determinant of the impedance-ratio matrix and the inverter stability is unveiled. Compared to the eigenvalues-based analysis, only one determinant rather than two eigenvalue s-function is required for the stability analysis. One Nyquist plot or pole map can be applied to the determinant to check the right-half-plane poles. The accuracy of the determinant-based stability analysis is also checked by comparing with the state-space stability analysis method. For the stability analysis, the coupling influence on the current control, the phase-locked loop, and the grid impedance are studied. The errors can be 10% in the stability analysis if the couplings are ignored.

The stable transfer method using zero power control in the CTTS system

2019 ◽  
Vol 57 (4) ◽  
pp. 376-384 ◽  
Author(s):  
Ho-Yun Seon ◽  
Ji-Hoon Yang ◽  
Sang-Hun Lee ◽  
Seong-Mi Park ◽  
Sung-Jun Park
Keyword(s):  
Power Control ◽  
Power Supply ◽  
Current Flow ◽  
The State ◽  
Power Sources ◽  
Electrical Arc ◽  
Transfer Method ◽  
The Stability ◽  
The Impact ◽  
Grid Management

In the CTTS system, while transferring the power supply from the grid to the generator, a sudden arc arises, which causes damage to the system. The method proposed in this study reduces this damage. The power state of the generator stage is made equal to the state of the power of the grid in order to prevent the occurrence of a sudden arc. Even if the generator power state is the same with the power state of the generator, an arc can be generated due to a sudden current flow during the transfer. Therefore, the current in the generator stage is controlled to 0 (zero) when transferring, so that the generation of an electrical arc is minimized. In general, when the CTTS system is used for transferring power sources with an emergency generator, the impact from the electrical arc will be momentarily proportional to the amount of the power supplied from the generator to the load. The damage by the arc will make the life of the CTTS system shorter. In order to prevent such damage, a blocking technique using parallel capacitor is constituted. However, this causes arc generation at the time of input. Thus, in this paper, it is proposed to control the effective or ineffective power of the system to zero. To verify the validity of the proposed method, firstly the Powersim simulation was conducted, and after confirming the feasibility based on this, the actual prototype was created and implemented. Zero power control is proposed as a way to improve the stability of CTTS by significantly reducing the generation of an electrical arc. And this technique can help people working on the distributed power or the grid management.

Research on Communication Architecture of Power Terminal Access Network

2016 ◽  
Vol 851 ◽  
pp. 626-630
Author(s):  
Bao Zheng ◽  
Yang Wang ◽  
Chong Zhen
Keyword(s):  
Information Transmission ◽  
Electric Power ◽  
Rural Areas ◽  
Communication System ◽  
Urban Areas ◽  
Access Network ◽  
System Communication ◽  
Communication Architecture ◽  
Remote Areas ◽  
Terminal Equipment

With the accelerated pace of urbanization and the increasing number of power users in urban areas, increased the amount of business of urban power communication system. At the same time, the distribution of users in remote areas, such as rural areas has been reduced, which means that the business needs of power communications reduced. For the situation, We proposed a power system communication architecture based on the number of terminal equipment. The scheme will effectively improve the current situation of electric power communication terminal access network, and improve the efficiency of information transmission.

scholarly journals Developing A Creative Economic-Based Village Tourism In Kendran Village Gianyar Regency

2019 ◽  
Vol 3 (1) ◽  
pp. 1
Author(s):  
Ni Ketut Arismayanti ◽  
I Gusti Ngurah Widyatmaja ◽  
I Wayan Wiraatmaja
Keyword(s):  
Local Community ◽  
Swot Analysis ◽  
External Environment ◽  
Tourism Industry ◽  
Creative Economy ◽  
Internal Environment ◽  
Sacred Places ◽  
Technological Advances ◽  
Tourism Information ◽  
The Stability

This research aims to identify the potential of natural tourism, cultural tourism, and creativity of local communities of Kendran Village and determine the condition of the internal environment (as seen from the strengths and weaknesses) and external environment (as seen from the opportunities and threats) of Kendran Village since the development of creative-economy based village tourism is one of the attempts to open up the market share (market niche) that had not been done yet. SWOT analysis method was used in this research to explore the potential of the internal environment, such as Strengths, namely rice field scenery with jogging tracks, the preserved traditional culture as traditional Balinese architecture, sacred places, historical relics in the village area, the activities of the Balinese-Hinduism ceremonies, arts and cultures, as well as the hospitality of communities, and accessible areas. We found the weaknesses on infrastructure, public facilities, lack of tourism programs along with its management, and lack of foreign languages including English. Likewise, on the external environment, they have the opportunities in location of Kendran Village, the popularity of village tourism, increasing of tourists arrival who are interested in culture & natural tourism, information and technological advances that support the promotion of Kendran Village, the support of the Gianyar Government, the development of creative-economy based tourism, and the threats such as increased competition in tourism industry, lack of passion of rural life in young generations, the culture commercialization, and also the stability of political and security situation in Indonesia. Index Terms— natural potentials, cultural potentials, creative local community, creative economy. 

Sign in / Sign up

Export Citation Format

Share Document