Feedback Linearization-Based Control Strategy for Interlinking Inverters of Hybrid AC/DC Microgrids with Seamless Operation Mode Transition

Nguyễn, Thanh Hải; Van, Tan Luong; Nawaz, Asif; Natsheh, Ammar

doi:10.3390/en14185613

Cited by 12 publications

(3 citation statements)

References 30 publications

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“…Taking into consideration the development of the present technology and the future reality of electrical generators and loads, DC microgrids started to arise as an important alternative to AC infrastructures. It is expected that in the very near future, AC and DC infrastructures will present themselves as complementary solutions [12][13][14][15][16]. In this context, the perspectives for the near future of DC microgrids are presented in this paper.…”

Section: Introductionmentioning

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: Introductionmentioning

confidence: 99%

DC Microgrids: Benefits, Architectures, Perspectives and Challenges

Pires

Cordeiro

2023

Energies

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“…Another reason is the ascending DC demand in various infrastructures such as data centers, electric vehicle (EV) charging stations, etc. [6][7][8]. However, the power switches in the inverter are vulnerable to failure for many reasons.…”

Section: Introductionmentioning

confidence: 99%

An Intelligent Control Strategy for a Highly Reliable Microgrid in Island Mode

Wang¹,

Yang

et al. 2022

Applied Sciences

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An intelligent control strategy based on a membership cloud model in a high reliable off-grid microgrid with a reconfigurable inverter is proposed in this paper. The operating principle of the off-grid microgrid with the reconfigurable inverter is provided, which contains four operating modes. An open-circuit fault diagnosis for the inverter is presented first. The polarities of the midpoint voltages defined in the paper are used to recognize the faulty power switch. The reconfigurable inverter allows the power switches of different bridges to be reconfigured, when there are power switches faulty, to let the inverter operate in faulty state. The working principle of the reconfigurable inverter is given. The membership cloud model with two output channels is built to obtain the virtual impedance to suppress the circulating currents between inverters when the reconfigurable inverter is in faulty state. A pulse resetting method is presented. The general intelligent control strategy for the reconfigurable inverter is formed as the droop-virtual impedance-voltage-current-pulses resetting control. The validity of the intelligent control strategy of the system is verified by simulation.

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“…Here, a decoupling strategy was implemented by introducing compensating terms to address the cross-coupling effects, and was validated to enhance dynamic stability. A highly effective linearization-based feedback control is implemented in [29] for smooth mode transfer of a hybrid microgrid from a grid connected to the island mode and vice versa. A PR controller's inherent active and reactive power decoupling capability was investigated in [30], and cross-coupling effects in the LCL filter section of a grid-connected inverter were studied.…”

mentioning

confidence: 99%

Decoupler-Based Feedback Control Strategy for Interlinking Converter in a Hybrid Microgrid

Nair

Kanakasabapathy

2023

Designs

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In a hybrid microgrid with AC and DC subgrids, the interlinking converter (IC) is the key element connecting the two subgrids. The performance of the interlinking converter is adversely affected by the d- and q-axis impedance interaction between the inner control loops. This interaction is highly undesirable since it adversely affects both the dynamic and the steady-state performance of the IC. Based on this, a novel feedback-based decoupling strategy is developed to overcome the cross-coupling effect in the mathematical model of the interlinking converter. This is a novel concept since the feed-forward compensation techniques are utilized to address the cross-coupling effect in prior related works, which has an inherent disadvantage of additional disturbance due to the addition of the compensating terms. In this study, a complete decoupling of the d and q axes was achieved, and the first-order transfer functions were obtained for the control loops using systematic block-reduction algebra and direct synthesis approaches. With this model, computational complexities are reduced and the inner control loops are free from impedance interaction effects, thereby achieving enhanced transient stability. Perfect decoupling of the voltage vectors is achieved by the matrix diagonalization method. Furthermore, the novelty of the proposed control is that the decoupled model is integrated with a normalization-based coordinate control strategy for effective bidirectional power transfer via the interlinking converter. Additionally, the proposed controller’s validity was tested for its performance under different transients in the MATLAB Simulink platform. The simulation results validated the proposed control strategy by showing that a faster response is ensured. A high-quality reference signal is generated due to the effective decoupling achieved. This observation was also validated by comparing the T.H.D. levels of a decoupled model’s reference power signal to one without a decoupling strategy.

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Feedback Linearization-Based Control Strategy for Interlinking Inverters of Hybrid AC/DC Microgrids with Seamless Operation Mode Transition

Cited by 12 publications

References 30 publications

DC Microgrids: Benefits, Architectures, Perspectives and Challenges

DC Microgrids: Benefits, Architectures, Perspectives and Challenges

An Intelligent Control Strategy for a Highly Reliable Microgrid in Island Mode

Decoupler-Based Feedback Control Strategy for Interlinking Converter in a Hybrid Microgrid

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