scholarly journals Control strategy to improve load/power sharing, DC bus voltage restoration, and batteries SOC balancing in a DC microgrid

2020 ◽  
Vol 14 (14) ◽  
pp. 2668-2679
Author(s):  
Mohammad Eydi ◽  
Reza Ghazi
Keyword(s):  
Control Strategy ◽  
Power Sharing ◽  
Dc Microgrid ◽  
Load Power ◽  
Dc Bus ◽  
Bus Voltage

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.

scholarly journals Research on Bus Voltage Control Strategy of Off-grid DC Microgrid

2020 ◽  
Vol 185 ◽  
pp. 01064
Author(s):  
Yilonɡ Kanɡ ◽  
Ningkang Zheng ◽  
Xiangyang Yan ◽  
Huanruo Qi ◽  
Kai Li
Keyword(s):  
Control Strategy ◽  
High Reliability ◽  
Voltage Control ◽  
Droop Control ◽  
Voltage Control Strategy ◽  
Dc Microgrid ◽  
Voltage Quality ◽  
Dc Bus ◽  
Bus Voltage

It is important to achieve stability of bus voltage in control of DC microgrids. In the DC microgrid, the traditional droop control method is usually adopted to stabilize the bus voltage for its high reliability and cost-effectiveness. However, line resistance will reduce the voltage quality of the DC bus in actual situations. In order to improve the voltage quality of the DC bus, a novel bus voltage control strategy based on modified droop characteristic is proposed. Finally, the simulation model of the off-grid DC microgrid with improved droop control strategy is built on PSCAD/EMTDC platform, and the results verify the effectiveness and feasibility of the proposed control strategy.

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 Dynamic compensation control strategy of DC bus voltage based on residual generator

2021 ◽  
Vol 104 (2) ◽  
pp. 003685042110262
Author(s):  
Changbin Hu ◽  
Heng Lu ◽  
Haipeng Wang ◽  
Jinghua Zhou ◽  
Shanna Luo ◽  
...  
Keyword(s):  
Control Strategy ◽  
System Structure ◽  
Current Loop ◽  
Voltage Fluctuations ◽  
Dynamic Compensation ◽  
Dc Microgrid ◽  
Compensation Control ◽  
Dc Bus ◽  
Bus Voltage ◽  
Residual Generator

Aiming at the problem of bus voltage control in DC microgrid, a dynamic compensation control strategy based on a residual generator is designed to complete the voltage compensation of DC-DC converter. Firstly, based on the DC microgrid system architecture, the bus voltage fluctuations are analyzed theoretically, and then the DC-DC converter state-space mathematical models of the DC microgrid system are established to obtain the input-output relationship of the control system. Based on the theory of double coprime decomposition and Youla parameterization stable controller, the proposed control architecture based on the residual generator is obtained, and the output value generated by the current disturbance is compensated in reverse by applying model matching theory. The voltage loop compensation controller Q( s) is obtained by the linear matrix inequality method (LMI), and the current loop compensation controller H( s) is designed according to the dynamic structure diagram of the DC-DC converter. Hardware-in-the-loop simulation (HILS) results show that the architecture can improve the dynamic performance of the DC-DC converter without changing the original system structure parameters, and suppress the DC bus voltage fluctuations caused by load switching, power fluctuations, and AC-side load imbalances, and enhance the robustness of the system.

Hierarchical control of DC microgrid with dynamical load power sharing

2019 ◽  
Vol 239 ◽  
pp. 1-11 ◽  
Author(s):  
Minghan Yuan ◽  
Yang Fu ◽  
Yang Mi ◽  
Zhenkun Li ◽  
Chengshan Wang
Keyword(s):  
Hierarchical Control ◽  
Power Sharing ◽  
Dc Microgrid ◽  
Load Power
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