Interconnected Autonomous ac Microgrids via Back-to-Back Converters—Part II: Stability Analysis

Naderi, Mobin; Khayat, Yousef; Shafiee, Qobad; Dragičević, Tomislav; Bevrani, Hassan; Blaabjerg, Frede

doi:10.1109/tpel.2020.2986695

Cited by 30 publications

(18 citation statements)

References 43 publications

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“…In the existing refs. [30][31][32][33][34], voltage recovery and current sharing have not been considered. In order to solve this problem, voltage recovery and current sharing control are proposed based on the voltage and current information provided by the upper PMS.…”

Section: Current Sharing and Voltage Recovery Controlmentioning

confidence: 99%

Power management and coordinated control strategy of flexible interconnected AC/DC hybrid microgrid with back‐to‐back converters

Luo

Sun

et al. 2023

Circuit Theory & Apps

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SummaryIn order to improve power regulation capability and system reliability, an interconnected hybrid microgrid (MG) topology with back‐to‐back (BTB) converters is a promising solution, but it also brings new technical challenges to the control system. The paper proposes a two‐level power management and coordinated control strategy for hybrid MG with BTB converters to ensure the stable operation of the system. Firstly, the structure of hybrid MG is analyzed, and model of BTB converters, photovoltaic (PV) cell and battery are established. Secondly, multiple constraints and operation characteristics of DG, ESS, and BTB converters are considered, the detailed operation modes are analyzed, and system‐level power management strategy is developed under grid normal, single‐terminal grid fault, and island operation conditions. A local‐level coordinated control strategy of BTB converters, battery energy storage system (BESS), and PV units is presented to ensure stable operation of the system in multi operation modes. The control coordination between the BTB converters and the ESS can ensure the stability of the AC voltage and frequency in the fault area and achieve uninterrupted power supply for important loads. Meanwhile, voltage recovery and current sharing control are proposed based on the voltage and current information provided by the upper power management system to eliminate DC voltage deviation and realize accurate current allocation. The current sharing and voltage recovery control is embedded in the local devices and will not have any impact on the upper power management system. Finally, the effectiveness of proposed method is verified by simulation and experimental results.

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Section: Current Sharing and Voltage Recovery Controlmentioning

confidence: 99%

Power management and coordinated control strategy of flexible interconnected AC/DC hybrid microgrid with back‐to‐back converters

Luo

Sun

et al. 2023

Circuit Theory & Apps

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“…Generally, the dynamics of three MG frequencies are similar due to interlinking using circuit breakers, i.e. the power section of IMGs is uniformed unlike interconnection using back-to-back converters [4], [5], [29]. Moreover, the frequency oscillations can be seen, which are caused by the inter-MG modes.…”

Section: B Frequency Responsementioning

confidence: 99%

“…The AC MGs can be interconnected via circuit breakers [6], [20], [21], [28], static switches [3] or back-to-back converters [4], [5], [29]. The first case is often of interest since it is economic.…”

mentioning

confidence: 99%

Low-Frequency Small-Signal Modeling of Interconnected AC Microgrids

Naderi

Shafiee

Bevrani

et al. 2021

IEEE Trans. Power Syst.

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As a solution for optimized, reliable and flexible operation of distribution systems, multiple AC microgrids can be interconnected. In this paper, a low-order low-frequency small-signal model is proposed for large-scale interconnected AC microgrids in order to analyze stability and dynamics as well as synthesize high-level controllers, e.g. inter-microgrid power flow controller. A sensitivity analysis-based technique is introduced to find significant modules of fully inverter-based AC microgrids for preserving the dominant low-frequency modes. The low-order model of AC microgrids including both droop-based and PQcontrolled distributed generation units is obtained by removing insignificant modules of the detailed model and reconfiguring the significant modules. The concept of virtual swing equation and the aggregation modeling method are employed to achieve a single-order model from the low-order model for each AC microgrid with any number of sources. The analysis and synthesis of the large-scale interconnected microgrids can easily be done using the proposed single-order model. The frequency analysis and control of three interconnected AC microgrids are presented as a case study, which leads to introducing the inter-microgrid oscillatory modes.

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“…In addition, microgrids safeguard electricity in unconnected remote regions [9]. The main grid recognizes the microgrid as a single entity and stabilizes its voltage level when grid-connected; therefore, its control requirement is to deliver power to the main grids [10].…”

Section: Introductionmentioning

confidence: 99%

Decentralized Virtual Impedance- Conventional Droop Control for Power Sharing for Inverter-Based Distributed Energy Resources of a Microgrid

et al. 2022

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The work presents the power-sharing in a standalone low voltage AC microgrid consisting of three parallel grid supporting inverters using a virtual impedance-based droop system. Typically, isolated microgrids suffer unique challenges regarding voltage, current, frequency regulation, power flow control, and power-sharing due to the absence of a stiff AC grid source. This work investigated the power flow and sharing technical challenges using three inverter-based distributed energy sources, three static loads, and one dynamic load. These distributed energy sources are interconnected with the loads using low voltage line impedance within the microgrid to implement the uneven power distribution. Furthermore, a distributed grid supporting control utilizing virtual impedance is proposed in this work to improve power-sharing. The microgrid model is developed with the MATLAB Simulink environment and validated using the Opal RT OP4510 simulator. The proposed technique ensured improved power-sharing and mitigated the effect of voltage drops introduced through a virtual impedance using combined positive and negative virtual.

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Interconnected Autonomous ac Microgrids via Back-to-Back Converters—Part II: Stability Analysis

Cited by 30 publications

References 43 publications

Power management and coordinated control strategy of flexible interconnected AC/DC hybrid microgrid with back‐to‐back converters

Power management and coordinated control strategy of flexible interconnected AC/DC hybrid microgrid with back‐to‐back converters

Low-Frequency Small-Signal Modeling of Interconnected AC Microgrids

Decentralized Virtual Impedance- Conventional Droop Control for Power Sharing for Inverter-Based Distributed Energy Resources of a Microgrid

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