Control of Interlinking Bidirectional Converter in AC/DC Hybrid Microgrid Operating in Stand-Alone Mode

Abdullah, Shahrum Shah; Sabzehgar, Reza; Rasouli, Mohammad; Fajri, Poria

doi:10.1109/ptc.2019.8810563

Cited by 12 publications

(13 citation statements)

References 15 publications

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“…The recovery control presented to compensate for the effect of the decline of fAC and UDC by droop control and improved the reliability of the control strategy. Further, the virtual impedance-based bi-directional droop control presented to achieve a high level of powersharing [70].…”

Section: A7 Bi-directional Droop Controlmentioning

confidence: 99%

A Comprehensive Review on Power Converters Control and Control Strategies of AC/DC Microgrid

Ansari¹,

Chandel²,

Tariq

2021

IEEE Access

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Owing to the smart lifestyle, environmental consciousness, and dwindling fossil fuel supplies, there is a huge demand for clean and green energy. Microgrid (MG) is a crucial approach to renewable and clean energy. Because of the success of the AC utility grid and the growing demand for critical loads, it is very convenient to provide AC/DC MG that can easily satisfy both the alternating current (AC) MG and the direct current (DC) MG requirements. Due to uncertainty in load variations, main grid failures, intermittent power generations from renewable energy sources (RESs), the synchronization and interconnection of different power converters are the paramount issues in the control of AC/DC MG. This paper presents an overview-oriented state of the art in the recent advancement in control strategies of AC/DC MG and its associated power converters control. Based on recent research, this paper summarizes unobstructed views on different topologies, types of power converters, power converter controls, and control strategies of AC/DC MG. Finally, it identified some future challenges that need to be addressed in order to develop a sustainable and reliable control strategy for AC/DC MG. This paper will serve as a guide for researchers. INDEX TERMS Distributed generation, Microgrids, AC/DC Microgrid, Centralized control, Decentralized control I. INTRODUCTION MGs compromise different RESs, i.e., PV cells, windmills, energy-storing systems (ESS), diesel generator sets, and small hydropower plants, as discussed in the [1,2]. With the advancements in power semiconductor devices, the integration of RESs with leading utility or MG becomes so more accessible. Based on the adopted topology, there are three types of MGs, classified as DC MG, AC MG, and AC/DC MG or hybrid MG [3]. The DC MGs are preferred to supply critical loads like computers, operation theatres, and billing counters. Whereas the AC MGs are preferred in supplying all loads during off-grid or on-grid. The AC/DC MG possesses the characteristics of both DC MG and AC MG. Since begin, in these types of MGs, the power converters are connected in parallel with the MG bus-bar and belong to the parallel topology of MG. Recently a seriescascaded MG topology is being investigated. Inam Ullah Nutkani and et al. in [4] has presented a series-cascaded AC MG topology to integrate the non-dispatchable RESs to the MG and offered its advantages and disadvantages over the parallel topology. Fig.1 shows the different topological advances of MGs.

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Section: A7 Bi-directional Droop Controlmentioning

confidence: 99%

A Comprehensive Review on Power Converters Control and Control Strategies of AC/DC Microgrid

Ansari¹,

Chandel²,

Tariq

2021

IEEE Access

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“…The capacity of islanded AC-DC hybrid microgrids is limited, and bus voltages are usually supported by converters, consequently, the interconnected converters are quite crucial to stable operations of AC-DC hybrid microgrids [5,6]. Furthermore, there are fewer rotating electrical generators, and the inertia of AC-DC hybrid microgrids is very small, and the anti-interference ability is extremely poor [7]. Islanded AC-DC hybrid microgrids are extremely sensitive to large disturbances, such as large power variations of new energy sources and loads.…”

Section: Introductionmentioning

confidence: 99%

Large signal stability criterion of AC–DC hybrid microgrids with constant power loads considering reference current limitation

Liu

Song

et al. 2022

IET Generation Trans & Dist

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Islanded AC-DC hybrid microgrids composed of new energy sources, constant power loads and energy storage system are typical non-linear systems, and guaranteeing large signal stability is a key issue. In this paper, the non-linear model of islanded AC-DC hybrid microgrids is established, and large signal stability criteria are obtained. Considering reference current limitation of the energy DC-AC converter, the derived large signal stability criterion gives important constraints on the constant power loads power, the power of energy storage unit, DC bus voltage, the inductor and equivalent resistance of the AC filter, DC capacitor, the proportional parameter of the inner current controller and the maximum instantaneous power of the DC-AC converter. The paper is summarized as follows. Firstly, the equivalent model of the AC-DC hybrid microgrids in DQ rotating frame is established. Then based on mixed potential theory, the mixed potential model is constructed, and large signal stability criterion is derived and optimized considering the reference current limitation of the DC-AC converter. Finally, the presented criterion is verified by simulation and experimental results.

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“…AC/DC hybrid microgrid is usually composed of AC sub-microgrid, DC sub-microgrid and bidirectional AC/DC converters(BIC). BIC plays an important role in maintaining the voltage stability of AC/DC bus and realizing the bidirectional energy flow as the medium of two sub-microgrids [2].…”

Section: Introductionmentioning

confidence: 99%

Improved Seamless Switching Control Strategy for AC/DC Hybrid Microgrid

Wang

Gao

2021

IEEE Access

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Aiming at the problems of transient over-current and over-voltage in the switching process of AC/DC hybrid microgrid in grid-connected mode and island mode, which leads to the sudden change of transmission power and seriously affects the power transmission quality. In this paper, an improved seamless switching control strategy of droop control with disturbance observer is designed. The main work is as follow: according to the diffident power transmission calculation methods of droop control in gridconnected mode and island mode, the adaptive switching is realized by detecting the current and frequency at Point of Common Coupling(PCC) of public power grid. Secondly, the switching from island mode to grid-connected mode will cause impact due to the difference of frequency, phase and amplitude between microgrid and public grid, and even cause system collapse. So the pre-synchronization control of frequency, phase and amplitude is designed. Based on the droop control, the disturbance observation(DOB) is added, which can quickly track the sudden change of system current, and suppress the sudden change by the difference between the tracking value and the actual value, so as to realize the smooth switching from island to grid. Finally, the effectiveness and feasibility of the control strategy are verify in Matlab/Simulink.

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Control of Interlinking Bidirectional Converter in AC/DC Hybrid Microgrid Operating in Stand-Alone Mode

Cited by 12 publications

References 15 publications

A Comprehensive Review on Power Converters Control and Control Strategies of AC/DC Microgrid

A Comprehensive Review on Power Converters Control and Control Strategies of AC/DC Microgrid

Large signal stability criterion of AC–DC hybrid microgrids with constant power loads considering reference current limitation

Improved Seamless Switching Control Strategy for AC/DC Hybrid Microgrid

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