scholarly journals Coordination Control and Energy Management of Standalone Hybrid AC/DC Microgrid

2021 ◽  
Author(s):  
Ritu Kandari ◽  
◽  
Pankaj Gupta ◽  
Ashwani Kumar ◽  
◽  
...  
Keyword(s):  
Control System ◽  
Energy Management ◽  
Secondary Source ◽  
Coordination Control ◽  
Super Capacitor ◽  
Dc Microgrid ◽  
Efficient Energy ◽  
Voltage Deviation ◽  
Dc Bus ◽  
Bus Voltage

An efficient energy management scheme for a standalone hybrid AC/DC microgrid (HMG) has been proposed in this paper. Energy management in a microgrid is a challenging task, because of the involvement of the distributed energy resources (DERs) which are intermittent in nature. The microgrid may therefore, undergo mismatch in demand and supply, when either the generation or load varies. This mismatch in power may result into DC bus voltage deviations and sometimes these deviations may be out of the permissible limits. A coordination control-based strategy (CCS) for DC bus voltage deviation mitigation and efficient energy management of the standalone microgrid is investigated here. The CCS is tested with the help of simulation studies on a test hybrid AC/DC microgrid in MATLAB covering all the scenarios which may arise. The test microgrid consists of a solar photovoltaic (PV) generation, a secondary source of generation, PEM fuel cell, a battery and a super capacitor. Coordination between the various sub-units and energy management of hybrid AC/DC microgrid is done using Fuzzy Logic Control (FLC) and the DC bus voltage deviations are also compared with PI based control system. It is found that the system with FLC has better performance than PI based control system.

scholarly journals Regulation Performance of Multiple DC Electric Springs Controlled by Distributed Cooperative System

Energies ◽  
2019 ◽  
Vol 12 (18) ◽  
pp. 3422
Author(s):  
Daojun Zha ◽  
Qingsong Wang ◽  
Ming Cheng ◽  
Fujin Deng ◽  
Giuseppe Buja
Keyword(s):  
Control System ◽  
Critical Load ◽  
Cooperative System ◽  
Excellent Performance ◽  
Storage Unit ◽  
Dc Microgrid ◽  
Energy Storage Unit ◽  
Study Case ◽  
Dc Bus ◽  
Bus Voltage

DC electric springs (DCESs) have been recently developed to improve the voltage stability of a DC microgrid. A lately proposed DCES topology is comprised of a DC/DC three port converter (TPC), a bi-directional buck-boost converter (BBC) and a battery, and is arranged as follows: The TPC input port is fed by a renewable energy source (RES) whilst the two TPC output ports supply a non-critical load (NCL) and a critical load (CL) separately; in turn, BBC together with the battery constitutes the DCES energy storage unit (ESU) and is connected in parallel to CL. In this paper, a set of DCESs with such a topology and with their CLs connected to a common DC bus is considered. The control of the DCESs is built up around a distributed cooperative system having two control levels, namely primary and secondary, each of them endowed with algorithms committed to specific tasks. The structure of the control levels is explicated and their parameters are designed. The control system is applied to a DCES set taken as a study-case and tested by simulation. The results of the tests show the excellent performance of the control system in both regulating the CL DC bus voltage and keeping the state-of-charge of the battery within predefined limits.

scholarly journals Design and Implementation of an Energy-Management System for a Grid-Connected Residential DC Microgrid

Energies ◽  
2020 ◽  
Vol 13 (16) ◽  
pp. 4074
Author(s):  
Alfredo Padilla-Medina ◽  
Francisco Perez-Pinal ◽  
Alonso Jimenez-Garibay ◽  
Antonio Vazquez-Lopez ◽  
Juan Martinez-Nolasco
Keyword(s):  
Energy Management ◽  
Management System ◽  
Operation Mode ◽  
Maximum Energy ◽  
Energy Management System ◽  
Dc Microgrid ◽  
Design And Implementation ◽  
Operation Modes ◽  
Dc Bus ◽  
Bus Voltage

The design and implementation of an energy-management system (EMS) applied to a residential direct current microgrid (DC-µG) is presented in this work. The proposed residential DC-µG is designed to provide a maximum power of one kilowatt by using two photovoltaic arrays (PAs) of 500 W, a battery bank (BB) of 120 V–115 Ah, a supercapacitor module of 0.230 F and a bidirectional DC–AC converter linked to the AC main grid (MG). The EMS works as a centralized manager and it defines the working operation mode for each section of the DC-µG. The operation modes are based on: (1) the DC-link bus voltage, (2) the generated or demanded power to each section of the DC-µG and (3) the BB’s state of charge. The proposed EMS—during the several working operation modes and at the same time—can obtain the maximum energy from the PAs, reduce the energy consumption from the main grid and keep the DC-link bus voltage inside a range of 190 V ± 5%. The EMS and local controllers are implemented by using LabVIEW and NI myRIO-1900 platforms. Moreover, experimental results during connection and disconnection of each DC-µG sections and different on-the-fly transitions are reported, these results focus on the behavior of the DC bus, which shows the DC bus robustness and stability. The robustness of the DC-µG is demonstrated by maintaining a balance of energy between the sources and loads connected to the DC bus under different scenarios.

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.

scholarly journals Impact of Information and Communication Technology Limitations on Microgrid Operation

Energies ◽  
2019 ◽  
Vol 12 (15) ◽  
pp. 2926 ◽  
Author(s):  
Mahmoud Saleh ◽  
Yusef Esa ◽  
Mohamed El Hariri ◽  
Ahmed Mohamed
Keyword(s):  
Communication Technology ◽  
Information Communication ◽  
Matlab Simulation ◽  
Dc Microgrid ◽  
Operational Conditions ◽  
Information And Communication ◽  
Dc Bus ◽  
Bus Voltage ◽  
And Control ◽  
The Impact

This paper provides an extensive review of the conducted research regarding various microgrids (MGs) control techniques and the impact of Information Communication Technology (ICT) degradation on MGs performance and control. Additionally, this paper sheds the light on the research gaps and challenges that are to be explored regarding ICT intrinsic-limitations impact on MGs operations and enhancing MGs control. Based on this assessment, it offers future prospects regarding the impact of ICT latencies on MGs and, consequently, on the smart grid. Finally, this paper introduces a case study to show the significance and examine the effect of wireless communication technologies latency on the converters and the DC bus voltage of a centralized controlled DC MG. A DC microgrid with its communication-based control scheme was modeled to achieve this goal. The MATLAB simulation results show that the latency impact may be severe on the converter switches and the DC bus voltage. Additionally, the results show that the latency impact varies depending on the design of the MG and its operational conditions before the latency occurs.

Application of SCES in Improving Dynamic Response of DC Microgrid Bus Voltage

2014 ◽  
Vol 521 ◽  
pp. 431-434
Author(s):  
Yuan Sheng Xiong ◽  
Jian Ming Xu
Keyword(s):  
Dynamic Response ◽  
Feedforward Control ◽  
Dc Microgrid ◽  
Wide Range ◽  
Supercapacitor Energy Storage ◽  
Response Performance ◽  
Dc Bus ◽  
Bus Voltage ◽  
The Stability ◽  
The Impact

To improve the stability of DC bus voltage in DC microgrid, and reduce the impact on microgrid equipments by the DC bus voltage fluctuations, a supercapacitor energy storage (SCES) is designed to connect to the DC bus by the bi-directional converter. The controller is designed by the feedforward control and proportional method with the deadband. The great load disturbance is simulated in PSIM software when the DC microgrid operates in the grid-connected rectification mode. The simulation results show that SCES under the proposed control strategy can reduce the fluctuation range of the DC bus voltage in a wide range of load disturbances, and the dynamic response performance of DC bus voltage is improved.

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