scholarly journals Development of a Smart Energy Community by Coupling Neighbouring Community Microgrids for Enhanced Power Sharing Using Customised Droop Control

Energies ◽  
2021 ◽  
Vol 14 (17) ◽  
pp. 5383
Author(s):  
Sandipan Patra ◽  
Sreedhar Madichetty ◽  
Malabika Basu
Keyword(s):  
Dynamic Performance ◽  
Coupled System ◽  
Power Sharing ◽  
System Stability ◽  
Droop Control ◽  
Mode Of Operation ◽  
Energy Community ◽  
Efficient Power ◽  
Equal Power ◽  
Selection Of

This article aims to develop a smart isolated energy community (EC) by coupling the neighbouring rural community microgrids (CMGs) with enhanced droop control for efficient power sharing. This recommended solution employs a power management (PM) based droop-control to enable independent neighbouring CMGs to share power on an available basis by not constraining CMG inverters to equal power sharing. During the grid-connected mode, the droop control may have different power setpoints of each CMG. However, during the standalone mode of operation, the power setpoint should be defined according to their power rating and availability to maintain the system stability. In this article, a PM strategy is developed to maintain the power setpoints of the autonomous CMGs. An improper selection of power setpoints in autonomous CMG can raise the DC link voltage to an unmanageable value and can cause an inadvertent shutdown of CMG. The suggested PM-based droop control enables the CMG inverter not to restrict the inverter to equal power share but to distribute its active power as available in an asymmetric way, if required. The dynamic performance of the proposed coupled system incorporated with two remote isolated CMGs is investigated in a MATLAB environment. Further, a laboratory prototype of the proposed system has been developed using a LabVIEW-based sbRIO controller to verify the efficacy of the proposed approach.

scholarly journals Deadbeat PQ Control for Islanded Smart Grids

2020 ◽  
Vol 4 (5) ◽  
Author(s):  
Ehab Bayoumi ◽  
Mostafa Soliman ◽  
Hisham Soliman
Keyword(s):  
Distributed Generation ◽  
Smart Grids ◽  
Pulse Width Modulation ◽  
Dynamic Performance ◽  
Power Sharing ◽  
System Stability ◽  
Pwm Inverter ◽  
Three Phase ◽  
Micro Grids ◽  
Selection Of

The dynamic performance of smart (micro)grids depends on the proper selection of the controller gains and power-sharing parameters. This manuscript describes the control design to achieve a deadbeat desirable performance in terms of: i) Zero steady-state error. ii) Minimum rise time. iii) Minimum settling time. iv) Less than 2% overshoot/undershoot. This paper considers an Islanded microgrid system composed of two distributed generation (DG) units. Each DG unit includes three-phase pulse width modulation (PWM) inverter. The proposed controllers are proportional- integral (PI) type. The Controllers gains of the inverters and the Phase Locked Loop (PLL) parameters are designed to guarantee deadbeat dynamic performance in terms of minimal overshoot and system stability. The Particle Swarm Optimization (PSO) is used to tune the controller parameters of the current, PQ loops, and the PLL. The proposed controllers are compared with the traditional (Ziegler and Nichols), auto-tuned, and interior-point methods to shows the excellence of the proposed technique. Results authenticate and endorse the effectiveness of the proposed controllers and PLL design technique to achieve the desired deadbeat response of the study microgrid system.

scholarly journals Improved Droop Control with Washout Filter

Energies ◽  
2018 ◽  
Vol 11 (9) ◽  
pp. 2415 ◽  
Author(s):  
Yalong Hu ◽  
Wei Wei
Keyword(s):  
Dynamic Performance ◽  
Singular System ◽  
Active Power ◽  
Power Sharing ◽  
Droop Control ◽  
Hardware In The Loop ◽  
Signal Model ◽  
Modeling Technology ◽  
Small Signal Model ◽  
Washout Filter

In this paper, a droop washout filter controller (DWC), composed of a conventional droop controller and a washout filter controller, is proposed. The droop controller is used to ensure the “plug-and-play” capability, and the droop gain is set small. The washout filter is introduced to compensate the active power dynamic performance (APDP). Compared to the droop controller, the DWC can achieve accurate active power sharing and smaller frequency difference without losing the APDP. Additionally, a novel modeling technology is proposed, using which a small-signal model for an island microgrid (MG) is constructed as a singular system. The system’s stability is analyzed and the DWC is verified using real-time (RT-LAB) simulation with hardware in the loop (HIL).

scholarly journals Robust Power Sharing and Voltage Stabilization Control Structure via Sliding-Mode Technique in Islanded Micro-Grid

Energies ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 883 ◽  
Author(s):  
Quan-Quan Zhang ◽  
Rong-Jong Wai
Keyword(s):  
Dynamic Response ◽  
Sliding Mode ◽  
Active Power ◽  
Power Sharing ◽  
System Stability ◽  
Droop Control ◽  
Voltage Amplitude ◽  
Voltage Deviation ◽  
Micro Grid ◽  
Control Relation

With a focus on the problems of active power sharing and voltage deviation of parallel-connected inverters in an islanded micro-grid (MG), in this study, the power-voltage droop controller and the inner voltage regulator are redesigned based on a total sliding-mode control (TSMC) technique. As for the power-voltage droop control loop, a droop control relation error between the active power and the point-of-common-coupling (PCC) voltage amplitude is defined. Then, the TSMC scheme is adopted to reach the new droop control relation, where the active power sharing and voltage amplitude recovery can be achieved simultaneously. Owing to the faster dynamic response and strong robustness provided by the TSMC framework, high-precision active power sharing during transient state also can be ensured without the influence of line impedances. The power allocation error can be improved by more than 81.2% and 50% than the conventional and proportional-integral (PI)-based droop control methods, respectively, and the voltage deviation rate can be reduced to 0.16%. Moreover, a small-signal model of the TSMC-based droop-controlled system is established, and the influences of control parameters on the system stability and the dynamic response are also investigated. The effectiveness of the proposed control method is verified by numerical simulations and experimental results.

Design of Droop-based Control for Power Management in Islanded RL-type Microgrids

2017 ◽  
Vol 18 (2) ◽  
Author(s):  
Mohammad Imran Azim ◽  
Jahangir Hossain ◽  
Hemanshu Pota
Keyword(s):  
Power Management ◽  
Reference Values ◽  
Transmission Lines ◽  
Control Strategy ◽  
Dynamic Performance ◽  
Power Sharing ◽  
System Stability ◽  
Control Law ◽  
Sharing Scheme ◽  
New Type

Abstract This paper proposes a new type of generalized droop-based proportional power sharing scheme during load change for parallel inverter-interfaced islanded microgrids, which is an automatic strategy and is independent of any particular nature of transmission lines, i.e., resistive or inductive. Real and reactive powers are shared in proportion to the droop gains by implementing the voltage control law proposed in this paper; in which the inverter-interfaced voltage-sources are kept at equal reference values. The control gains are chosen based on eigenvalue analysis in a way that the system stability is ascertained. The performance of the designed controller is simulated under different microgrid structures such as load variation and various types of transmission lines; in which the results show superior dynamic performance in comparison to the conventional droop-based control strategy.

scholarly journals Droop control technique for equal power sharing in islanded microgrid

2019 ◽  
Vol 10 (1) ◽  
pp. 530
Author(s):  
A. W. N. Husna ◽  
M. A. Roslan ◽  
M. H. Mat
Keyword(s):  
Single Phase ◽  
Fuzzy Logic Controller ◽  
Power Sharing ◽  
Control Technique ◽  
Frequency Error ◽  
Droop Control ◽  
Frequency Reference ◽  
Islanded Microgrid ◽  
The Stability ◽  
Equal Power

This paper presents a droop control technique for equal power sharing in islanded microgrid. In this study, the proposed controller is based on the frequency droop method, is applied to a robust droop controller in parallel connected inverters. The previous robust droop controller deals with voltage droop method. A modification has been formed against this controller by adding a fuzzy logic controller with the frequency droop method. The only sharing error which is concentrated in this paper is the error in sharing the rated frequency among the inverters. By adapting fuzzy in the robust droop, it tries to eliminate the frequency error, hence that the frequency reference of the inverters keeps maintain at 50Hz. A derivation of generalized models of a single-phase parallel-connected inverter system is shown. The simulation results show that the proposed controller with FLC is able to improve the stability of frequency reference and the performance of power sharing between the inverters under the inductive line impedance.

A Power Sharing Method for Parallel Inverters with Virtual Synchronous Generator Control Strategy

2016 ◽  
Vol 4 (2) ◽  
pp. 317
Author(s):  
Sara Yahia Altahir Mohamed ◽  
Xiangwu Yan
Keyword(s):  
Control Strategy ◽  
Reactive Power ◽  
Voltage Drop ◽  
Synchronous Generator ◽  
Power Sharing ◽  
System Stability ◽  
Droop Control ◽  
Active And Reactive Power ◽  
Virtual Inertia ◽  
Virtual Synchronous Generator

<p>A new power sharing method of a virtual sychronous generator control based inverters is introduced in this paper. Since virtual synchronous generator has virtual inertia and damping properties, it significantly enhances the grid stability. However, its output power considerably affects by the line impedance. Thus, in this paper, the relation between the droop control and the line impedance is analyzed at first. Then, by appling an improved droop control strategy to an inverter based on the virtual sychronous generator control, achieving proportional active and reactive power sharing unaffected by the line impedance is realized. The result shows that a smooth response is achieved. As well as, the voltage drop caused by the line impedance is totally compensated. As a result, the system stability is furtherly improved. At last, the effectiveness of the proposed method is verified through MATLAB/Simulink.</p>

Toward a just and inclusive environmental archaeology of southwest Madagascar

2019 ◽  
Vol 19 (3) ◽  
pp. 307-332 ◽  
Author(s):  
Kristina Douglass ◽  
Eréndira Quintana Morales ◽  
George Manahira ◽  
Felicia Fenomanana ◽  
Roger Samba ◽  
...  
Keyword(s):  
Marine Protected Area ◽  
Knowledge Exchange ◽  
Power Sharing ◽  
Environmental Archaeology ◽  
Collaborative Partnerships ◽  
Human Environment ◽  
Self Evaluation ◽  
Mutual Knowledge ◽  
Equal Power

In this paper, we advocate a collaborative approach to investigating past human–environment interactions in southwest Madagascar. We do so by critically reflecting as a team on the development of the Morombe Archaeological Project, initiated in 2011 as a collaboration between an American archaeologist and the Vezo communities of the Velondriake Marine Protected Area. Our objectives are to assess our trajectory in building collaborative partnerships with diverse local, indigenous, and descendent communities and to provide concrete suggestions for the development of new collaborative projects in environmental archaeology. Through our Madagascar case study, we argue that contemporary environmental and economic challenges create an urgency to articulate and practice an inclusive environmental archaeology, and we propose that environmental archaeologists must make particular efforts to include local, indigenous, and descendent communities. Finally, we assert that full collaboration involves equal power sharing and mutual knowledge exchange and suggest an approach for critical self-evaluation of collaborative projects.

Adaptive Droop Control of VSC-MTDC System for Frequency Support and Power Sharing

2018 ◽  
Vol 33 (2) ◽  
pp. 1264-1274 ◽  
Author(s):  
Weiyu Wang ◽  
Yong Li ◽  
Yijia Cao ◽  
Ulf Hager ◽  
Christian Rehtanz
Keyword(s):  
Power Sharing ◽  
Droop Control
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