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).

Development of a small-signal model for a two-phase three-wire active power filter

2017 ◽  
Author(s):  
Marcio C. B. P. Rodrigues ◽  
Pablo C. S. Furtado ◽  
Claudio R. B. S. Rodrigues ◽  
Rodrigo A. F. Ferreira ◽  
Andre A. Ferreira ◽  
...  
Keyword(s):  
Active Power Filter ◽  
Active Power ◽  
Small Signal ◽  
Signal Model ◽  
Two Phase ◽  
Power Filter ◽  
Small Signal Model

scholarly journals An Enhanced Dual Droop Control Scheme for Resilient Active Power Sharing Among Paralleled Two-Stage Converters

2017 ◽  
Vol 32 (8) ◽  
pp. 6091-6104 ◽  
Author(s):  
Hongpeng Liu ◽  
Yongheng Yang ◽  
Xiongfei Wang ◽  
Poh Chiang Loh ◽  
Frede Blaabjerg ◽  
...  
Keyword(s):  
Active Power ◽  
Power Sharing ◽  
Droop Control ◽  
Two Stage ◽  
Control Scheme

scholarly journals A New Adaptive Control Strategy of active and reactive power sharing in Islanded Microgrids

2016 ◽  
Vol 19 (4) ◽  
pp. 14-34
Author(s):  
Phuong Minh Le ◽  
Duy Vo Duc Hoang ◽  
Hoa Thi Xuan Pham ◽  
Huy Minh Nguyen ◽  
Dieu Ngoc Vo
Keyword(s):  
Transmission Line ◽  
Distributed Generation ◽  
Reactive Power ◽  
Active Power ◽  
Power Sharing ◽  
Droop Control ◽  
Active And Reactive Power ◽  
Three Phase ◽  
Islanded Microgrid ◽  
Adaptive Control Strategy

This paper proposes a new control sharing method for parallel three-phase inverters in an islanded microgrid. The proposed technique uses adaptive PIDs combined with the communication among the parallel inverters to accurately share active power and reactive power among the inverters via adjusting the desired voltage if there is a distinct difference between line impedance and the load change in the microgrid. Moreover, the paper also presents the response ability of the inverters to maintain the error within the allowed limits as the transmission line is interrupted. The proposed technique has been verified in a microgrid with three parallel distributed generation-inverter units using Matlab/Simulink. In the simulation, as the droop control using the communication information among the inverters, the sharing errors for active power and reactive power are around 0.2% and 0.6%, respectively. As the connection between the microgrid and transmission line is interrupted, the sharing errors for active power and reactive power increase to 0.4% and 2%, respectively. The simulation results have indicated that the proposed technique is superior to the traditional droop control in terms of the accuracy and stability. Therefore, the new proposed technique can be a favor alternative model for active power and reactive power sharing control of parallel inverters in an islanded microgrid.

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.

scholarly journals Consensus active power sharing for islanded microgrids based on distributed angle droop control

2021 ◽  
Author(s):  
Tao Xu ◽  
Jiaxin Zhou ◽  
Lemeng Liang ◽  
Yuhan Wu ◽  
Shuqi Cai ◽  
...  
Keyword(s):  
Active Power ◽  
Power Sharing ◽  
Droop Control

scholarly journals Reactive power sharing in microgrid using virtual voltage

2021 ◽  
Vol 11 (4) ◽  
pp. 2743
Author(s):  
Eder A. Molina-Viloria ◽  
John E. Candelo Becerra ◽  
Fredy E. Hoyos Velasco
Keyword(s):  
Power Control ◽  
Control Strategy ◽  
Reactive Power ◽  
Low Voltage ◽  
Active Power ◽  
Power Sharing ◽  
Droop Control ◽  
Matlab Simulink ◽  
Distributed Generators ◽  
Additional Coefficient

The traditional droop control strategy has been applied previously in microgrids (MGs) to share accurately the active power. However, in some cases the result obtained when sharing reactive power is not the best, because of the parameters related to the distances from distributed generators (DGs) to the loads and the power variations. Therefore, this paper proposes a reactive power control strategy for a low voltage MG, where the unequal impedance related to the distances between generators and loads requires adjustments to work with the conventional frequency and voltage droop methods. Thus, an additional coefficient is calculated from parameters of the network that relate the location of elements. The test is perfomed by simulations in the MATLAB-Simulink software, considering a three-node MG with three DGs and a load that can change power at different periods of time. The results show that it is possible to improve reactive power sharing between the DGs located in the MG according to the load changes simulated and to improve voltages with this method.

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.

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