Decentralized Coordination Control of Multiple Photovoltaic Sources for DC Bus Voltage Regulating and Power Sharing

2018 ◽  
Vol 65 (7) ◽  
pp. 5601-5610 ◽  
Author(s):  
Hongda Cai ◽  
Ji Xiang ◽  
Wei Wei
Keyword(s):  
Power Sharing ◽  
Coordination Control ◽  
Decentralized Coordination ◽  
Dc Bus ◽  
Bus Voltage

scholarly journals A hybrid power system based on fuel cell, photovoltaic source and supercapacitor

2020 ◽  
Vol 2 (5) ◽  
Author(s):  
Seydali Ferahtia ◽  
Ali Djerioui ◽  
Samir Zeghlache ◽  
Azeddine Houari
Keyword(s):  
Fuel Cell ◽  
Power Sharing ◽  
Dc Microgrid ◽  
Storage Element ◽  
Load Variations ◽  
Management Algorithm ◽  
Controversial Topic ◽  
Management Method ◽  
Dc Bus ◽  
Bus Voltage

Abstract In this study, we present an ameliorated power management method for dc microgrid. The importance of exploiting renewable energy has long been a controversial topic, and due to the advantages of DC over the AC type, a typical DC islanded micro-grid has been proposed in this paper. This typical microgrid is composed of two sources: fuel cell (FC), solar cell (PV) and one storage element [supercapacitor (SC)]. Here, we aimed to provide a management strategy that guarantees optimized bus voltage with arranged power-sharing between the sources. This proposed management aims to provide high-quality energy to the load under different loading conditions with variable solar irradiance, taking into account the FC state. Due to the slow dynamics of the FC, the SC was equipped to supply the transient period. A management algorithm is implemented to hold the DC bus voltage stable against the load variations. The management controller is based on differential flatness approach to generate the references. The DC bus is regulated by the SC energy; to reduce the fluctuations in the DC bus voltage, The PI controller is implemented. This proposed strategy reduces the voltage ripple in the DC bus. Moreover, it provides permanent supplying to the load with smooth behaviour over the sudden changes in the demand as depicted in the simulation results. Our study revealed that this proposed manager can be used for this kind of grids easily.

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 Coordinated Control of Diesel Generators and Batteries in DC Hybrid Electric Shipboard Power System

Energies ◽  
2021 ◽  
Vol 14 (19) ◽  
pp. 6246
Author(s):  
Luona Xu ◽  
Baoze Wei ◽  
Yun Yu ◽  
Josep M. Guerrero ◽  
Juan Vasquez
Keyword(s):  
Operation Mode ◽  
Power Sharing ◽  
Mode Switching ◽  
Maritime Industry ◽  
Power Sources ◽  
Operation Modes ◽  
Dc Bus ◽  
Hybrid Electric ◽  
Diesel Generators ◽  
Bus Voltage

Hybrid electric ships powered by diesel generators and batteries are the main configuration for shipboard microgrids (SMGs) in the current maritime industry. Extensive studies have been conducted for the hybrid operation mode, whereas the all-electric operation mode and the switching between the aforementioned two modes in a system with multiple generators and batteries have not been tested. In this paper, a coordinated approach for a hybrid electric ship is proposed, where two operation modes have been simultaneously considered. More specifically, for achieving an efficient operation with reduced generator wear losses, the governor-less diesel-engine-driven generators have been adopted in the study. According to the practical operation conditions, two operation modes, the all-electric and hybrid modes, are preset. Based on these, the coordination of the generators acting as the main power sources and batteries regulating the power flow and improving the generator efficiency is studied. The governor-less diesel generators are regulated to inject the rated power in order to maximize the generator efficiency, while the DC bus voltage is regulated by DC/DC converters. For the benefit of the overall lifespan of battery banks, power sharing during charging and discharging states have been realized by the state of charge (SoC)-based adaptive droop regulator. For the test of two operation modes, as well as the mode switching, a simulation assessment in a 1 kV DC SMG has been conducted. The simulation results show that the DC bus voltage can be controlled well, and that the power sharing among batteries follows the design. Additionally, smooth transients can be observed during mode switching when the proposed control scheme is applied.

A flexible power management strategy for PV-battery based interconnected DC microgrid

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Mrutunjaya Panda ◽  
Vijaya Bhaskar Devara ◽  
Surender Reddy Salkuti
Keyword(s):  
Distributed Generation ◽  
Control Strategy ◽  
Power Sharing ◽  
Communication Line ◽  
Dc Microgrid ◽  
Power Management Strategy ◽  
Central Controller ◽  
Dc Bus ◽  
Bus Voltage ◽  
Secondary Power

Abstract In this paper, a coordinated power-sharing strategy for interconnected DC-microgrid (DC-MG) is proposed. The DC-MG consists of two subgrids with an interlinking bidirectional DC/DC converter (IBDDC). Each subgrid has a secondary-1 controller based on a state of charge (SoC) balancing based droop control strategy of the battery unit (BU). The proposed droop strategy regulates the DC bus voltage according to the SoC of BU. With the SoC balancing based droop method, BU with higher SoC supplies more power to the microgrid (MG) as compared to low SoC BU. The SoC information of batteries in all subgrids is communicated through low bandwidth communication (LBC). In case of failure of LBC, a secondary-2 controller is implemented for the battery controller to regulate the DC bus voltage considering the SoC of BU. Secondary-2 does not depend on the communication line. Considering the levels of DC bus voltages, a secondary power regulating controller is introduced for IBDDC. Further, a coordinated power control strategy is proposed for distributed generation to avoid overcharging of batteries. The whole system operates in a distributed way without a central controller. The proposed strategy has been verified in MATLAB/Simulink.

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.

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