A Novel Control Technique for Voltage Balancing in Bipolar DC Microgrids

Doubabi, Hajar; Essounbouli, Najib

doi:10.3390/en15093368

Cited by 6 publications

(5 citation statements)

References 21 publications

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“…References Unipolar configuration [45][46][47][48][49][50][51] Bipolar configuration [45][46][47][52][53][54][55][56][57][58][59] Through the comparison of both configurations, the bipolar DC microgrid presented several advantages, such as a higher number of voltage levels (two instead of one), increased efficiency and a power supply with increased quality [17]. Another important feature is related to reliability, which is higher in the bipolar architecture since, in the case of having a fault in one of the wires, the load can be supplied by the other two healthy lines [17][18][19].…”

Section: Structuresmentioning

confidence: 99%

DC Microgrids: Benefits, Architectures, Perspectives and Challenges

Pires

Cordeiro

2023

Energies

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One of the major paradigm shifts that will be predictably observed in the energy mix is related to distribution networks. Until now, this type of electrical grid was characterized by an AC transmission. However, a new concept is emerging, as the electrical distribution networks characterized by DC transmission are beginning to be considered as a promising solution due to technological advances. In fact, we are now witnessing a proliferation of DC equipment associated with renewable energy sources, storage systems and loads. Thus, such equipment is beginning to be considered in different contexts. In this way, taking into consideration the requirement for the fast integration of this equipment into the existing electrical network, DC networks have started to become important. On the other hand, the importance of the development of these DC networks is not only due to the fact that the amount of DC equipment is becoming huge. When compared with the classical AC transmission systems, the DC networks are considered more efficient and reliable, not having any issues regarding the reactive power and frequency control and synchronization. Although much research work has been conducted, several technical aspects have not yet been defined as standard. This uncertainty is still an obstacle to a faster transition to this type of network. There are also other aspects that still need to be a focus of study and research in order to allow this technology to become a day-to-day solution. Finally, there are also many applications in which this kind of DC microgrid can be used, but they have still not been addressed. Thus, all these aspects are considered important challenges that need to be tackled. In this context, this paper presents an overview of the existing and possible solutions for this type of microgrid, as well as the challenges that need to be faced now.

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Section: Structuresmentioning

confidence: 99%

DC Microgrids: Benefits, Architectures, Perspectives and Challenges

Pires

Cordeiro

2023

Energies

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“…Today's microgrid topologies used to realize it are single bus, radial, ring, mesh, and interconnected. At the same time, two configurations are used today for single bus topology: unipolar configuration [4] and bipolar configuration [5][6][7][8][9][10][11]. In the unipolar configuration, there are only active potential U DC and ground, while in the bipolar configuration, there are two potentials with the same value but opposite sign and ground.…”

Section: Introductionmentioning

confidence: 99%

“…In a bipolar DC microgrid, unevenly distributed loads can cause a voltage balancing issue. To address this problem, H. Doubabi et al [8] proposed an advanced control strategy that uses a backstepping method called the voltage-balancing controller. This approach guarantees global asymptotic stability and robustness.…”

Section: Introductionmentioning

confidence: 99%

Adaptation of Microinverter Reference Design for Integration with Battery Energy Storage Systems in Microgrids

Jolevski,

Jakus,

Vasilj

et al. 2024

Energies

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The paper presents an adaptation of the microinverter platform from Texas Instruments to incorporate a battery energy storage system (BESS) alongside the development of the BESS system itself. Initially designed for unidirectional power flow between PV panels and an electric grid, the platform required modifications to accommodate bidirectional energy transfer for BESS integration. These modifications encompass software adjustments and hardware enhancements, which are all detailed within the paper. The electrical configuration includes selecting and deploying components such as DCDC power converters, microcontrollers, measured signals, and actuating signals to facilitate battery connection to the platform’s DC bus. Furthermore, a supervisory control and data acquisition (SCADA) system is devised for supervisory control and monitoring, with its implementation outlined. Control software tailored for the chosen microcontroller of the DCDC converters is described in terms of structure and functionality. A hardware-in-the-loop (HIL) methodology is employed to validate the proposed modifications and microgrid configuration. Utilizing the real-time simulator OPAL-RT, the paper presents experimental results and their analysis within the considered microgrid environment.

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“…But it has the problem of difficult parameter selection. Reference [14] proposes a controller designed based on backstepping method, which can effectively improve the robustness of the system, but has slight shortcomings in voltage balance and stability.…”

Section: Introductionmentioning

confidence: 99%

Voltage Feed-Forward Control of Photovoltaic- Battery DC Microgrid Based on Improved Seeker Optimization Algorithm

Wu,

Gong,

Mao

et al. 2024

IEEE Access

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The photovoltaic-battery DC microgrid is a new type of power system supply architecture that can effectively utilize renewable energy and is suitable for modern DC electrical equipment. In this paper, a fast and efficient maximum power point tracking (MPPT) photovoltaic (PV) control method and a battery energy storage system (BESS) bus control method are proposed to improve the PV utilization and the bus voltage performance. Firstly, the principle of photovoltaic-battery and power balance is analyzed, and the mathematical model of each distributed generation in the DC microgrid is derived. Secondly, by introducing the voltage increment and time-varying smoothing factor, the exponential variable step perturbation and observation method for PV controller is proposed to accelerate the MPPT process. Considering the intermittent disturbance of PV energy absorption and large power fluctuation on the DC bus, parameters of BESS voltage controller are optimized by the improved seeker optimization algorithm (ISOA) which is improved by the variational Cauchy operator and chaotic initialization optimization strategy. Furthermore, to improve the voltage closed-loop response speed and reduce the hysteresis characteristics, a feed-forward compensation strategy is designed. Finally, multi-scheme simulation experiments are implemented in MATLAB/Simulink. Compared with the experimental results of traditional control method, the proposed method reduces the average voltage ripple percentage from 3% to 1%, and improves the MPPT response speed from 70ms to 10ms. The experimental results verified the correctness and effectiveness of the proposed method.INDEX TERMS DC microgrid; voltage stabilization control; PID control; seeker optimization algorithm; maximum power point tracking.

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A Novel Control Technique for Voltage Balancing in Bipolar DC Microgrids

Cited by 6 publications

References 21 publications

DC Microgrids: Benefits, Architectures, Perspectives and Challenges

DC Microgrids: Benefits, Architectures, Perspectives and Challenges

Adaptation of Microinverter Reference Design for Integration with Battery Energy Storage Systems in Microgrids

Voltage Feed-Forward Control of Photovoltaic- Battery DC Microgrid Based on Improved Seeker Optimization Algorithm

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