A Bidirectional Virtual Inertia Control Strategy for the Interconnected Converter of Standalone AC/DC Hybrid Microgrids

Wang, Jie; Huang, Wentao; Tai, Nengling; Yu, Moduo; Li, Ran; Zhang, Yong

doi:10.1109/tpwrs.2023.3246522

Cited by 9 publications

(10 citation statements)

References 21 publications

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“…Different voltage levels are not required for transmission, distribution, or end-use, as is the case with AC systems. Different control strategies such as multi-agent based nonlinear control [46], distributed secondary control [47], and virtual inertia control [48] are presented for AC microgrids. Interested readers can find several research and review articles on the comparison of AC and DC microgrids voltage control [44], [49]- [51].…”

Section: DC Microgrid Voltage Controlmentioning

confidence: 99%

A Critical Review on DC Microgrids Voltage Control and Power Management

Al-Ismail

2024

IEEE Access

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Direct current (DC) microgrids are becoming increasingly important due to a number of causes, including the widespread use of DC loads, the integration of solar photovoltaic (PV) and energy storage devices (ESDs), and the absence of frequency and reactive power control issues. The control of DC bus voltage, power management, effective power split among the ESDs, and state of charge (SoC) restorations are important in a DC microgrid. However, DC bus voltage control and power management are difficult since the microgrids connect several distributed generators (DGs), loads, utility grids, and ESDs to the DC bus using power electronic converters. It is imperative to properly control the DC bus voltage and manage power among the sources and loads in order to maintain the stability and reliability of DC microgrids. DC microgrids can be controlled by employing centralized, decentralized, distributed, multi-level, and hierarchical control systems to ensure safe and secure operation. Besides, advanced control techniques, such as nonlinear, robust, model predictive, artificial intelligence, and many others, are employed. This article critically reviews two main aspects of DC microgrids: voltage control and power management. The challenges and opportunities for voltage control and power management in DC

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Section: DC Microgrid Voltage Controlmentioning

confidence: 99%

A Critical Review on DC Microgrids Voltage Control and Power Management

Al-Ismail

2024

IEEE Access

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“…The DC grid could be connected to the AC utility through an interface converter at the point of common coupling (PCC). Given the interconnection of AC and DC grids, the performance of interface converters is crucial to system operation [1,2]. Compared with isolated converters, transformerless converters have several advantages, including their low cost and reduced size, which facilitate their inclusion in low-voltage distribution systems in commercial and residential facilities.…”

Section: Introductionmentioning

confidence: 99%

A Transformerless Converter with Common-Mode Decoupling in Low-Voltage Hybrid Grids

Wang,

Zhang,

Han

et al. 2024

Processes

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Compared with isolated converters, transformerless converters are a preferred choice in low-voltage grids due to their efficiency and lower cost. However, leakage current and common mode (CM) voltage appear through the converter and ground in hybrid grids, which consist of AC and DC subgrids. The leakage current and CM voltage seriously influence operation and power quality in low-voltage distribution systems. This paper proposes a common-ground-type (CGT) converter equipped with a CM decoupling control strategy to eliminate the leakage current and CM voltage. A CM model is derived, and the leakage current and CM voltage are analyzed in detail. A CGT four-leg converter is constructed to eliminate the high frequency CM voltage. A dual DQ current control loop is developed to suppress the DC double-frequency ripple. Additionally, an active damping method is proposed, based on the neutral current feed-forward plus inductor current feedback, to attenuate the low frequency CM voltage. The proposed converter and control strategy guarantees excellent performance in suppressing leakage current and CM voltage. The DC voltage of the converter connected to the DC grid maintains stability and symmetry. The leakage current is significantly reduced, and the leakage current suppression performance is improved by 83%. The high frequency CM voltage is attenuated from 50%udc to 2%udc, and the low frequency CM voltage is suppressed from approximately 32%udc to 3%udc, which is a significant improvement compared with the traditional method. In addition, the proposed control strategy has good transient performance when the load changes abruptly. Finally, an experimental platform is established to validate the feasibility and performance. The experiment results showed that the proposed control strategy improves the system performance and power quality.

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“…However, these studies are confined to the frequency stability under small disturbances. Therefore, a multi-parameter cooperative adaptive strategy is investigated to enhance the frequency stability under grid faults [26]. However, the aforementioned studies are confined to frequency stability and ignore the influence of control parameter adjustment on VSG transient stability.…”

Section: Introductionmentioning

confidence: 99%

A Method to Improve Both Frequency Stability and Transient Stability of Virtual Synchronous Generators during Grid Faults

Yang,

Tu,

Xiao

et al. 2024

Sustainability

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Transient stability and frequency stability of virtual synchronous generator (VSG)-controlled converters during grid faults are critical for the stable operation of high-share renewable energy power systems. However, the existing transient stability methods often overlook the consideration of frequency stability. This paper presents a method to improve both frequency stability and transient stability of VSGs during grid faults. The influence mechanism of inertia and damping on transient stability and frequency stability is comprehensively analyzed under two types of faults, with or without stable equilibrium points. To address the conflict between frequency stability and transient stability of VSGs with large inertia under the first type of fault, an improved VSG control with angular frequency deviation feedback is proposed. The transient response of this control method is analyzed using small-signal and large-signal models. Furthermore, to achieve optimal dynamic performance, this improved VSG control introduces the optimal damping ratio and presents a parameter design method. Finally, the correctness of the proposed method and its theoretical analysis is verified through experimental results.

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A Bidirectional Virtual Inertia Control Strategy for the Interconnected Converter of Standalone AC/DC Hybrid Microgrids

Cited by 9 publications

References 21 publications

A Critical Review on DC Microgrids Voltage Control and Power Management

A Critical Review on DC Microgrids Voltage Control and Power Management

A Transformerless Converter with Common-Mode Decoupling in Low-Voltage Hybrid Grids

A Method to Improve Both Frequency Stability and Transient Stability of Virtual Synchronous Generators during Grid Faults

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