Article
Engineering, Electrical & Electronic
Andreu Cecilia, Subham Sahoo, Tomislav Dragicevic, Ramon Costa-Castello, Frede Blaabjerg
Summary: This article presents a distributed nonlinear adaptive observer to overcome limitations in detecting and mitigating false data injection attacks in collaborative dc microgrids. Necessary conditions for the stability of the distributed scheme are determined, and numerical simulations are validated in a real experimental prototype considering communication delay, uncertainty, and noise.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2022)
Article
Engineering, Electrical & Electronic
Jingqiu Zhang, Subham Sahoo, Jimmy Chih-Hsien Peng, Frede Blaabjerg
Summary: Limited global information in DC microgrids with distributed cooperative control makes them vulnerable to cyber attacks, and a novel false data injection attack model called the concurrent attack is discussed in this study. An energy-based detection strategy and a differentiation criterion based on voltage correction terms from a voltage observer are proposed to distinguish between the concurrent attack and communication link attack. The effectiveness of the proposed resilient control scheme is demonstrated through simulations and experimental results.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2021)
Article
Automation & Control Systems
Yun Liu, Yuanzheng Li, Yu Wang, Xian Zhang, Hoay Beng Gooi, Huanhai Xin
Summary: This article proposes a robust and resilient distributed optimal frequency control scheme to address the threat of cyber attacks on autonomous microgrids (MGs). The scheme introduces an auxiliary networked system to maintain functionalities and mitigates the impact of attacks through attenuation or isolation.
IEEE TRANSACTIONS ON INDUSTRIAL INFORMATICS
(2022)
Article
Engineering, Electrical & Electronic
Jianguo Zhou, Yinliang Xu, Lun Yang, Hongbin Sun
Summary: This paper investigates the power sharing and voltage regulation issues of islanded microgrids where both sources and loads are unbalanced, and cyber-attacks against sensors of distributed generator units are considered. A distributed adaptive observer is designed to neutralize the effect of cyber-attacks and ensure system stability and bounded voltage synchronization.
JOURNAL OF MODERN POWER SYSTEMS AND CLEAN ENERGY
(2022)
Article
Automation & Control Systems
Jinghang Lu, Haiyang Jiang, Xiaochao Hou, Peng Wang
Summary: This article proposes a distributed edge-based event-triggered control strategy for dc bus voltage recovery and proper current sharing under denial of service (DoS) attacks. By designing a new sampling and triggered mechanism, the proposed technique eliminates dc bus voltage deviation and achieves proper current sharing under DoS attacks. The stability of the system is proven using Lyapunov theory, demonstrating that the edge-based event detector guarantees the asymptotic stability of the dc microgrid under DoS attacks. Experimental case studies are presented to verify the feasibility of the proposed control method.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2023)
Article
Construction & Building Technology
Mahdi Azimian, Vahid Amir, Saeid Javadi, Soheil Mohseni, Alan C. Brent
Summary: This paper introduces a cyber-attack-resilient design of a multi-carrier microgrid, which aims to minimize the total planning cost and ensure the reliable supply of critical loads. Numerical simulations demonstrate the effectiveness and economic viability of the proposed model.
SUSTAINABLE CITIES AND SOCIETY
(2022)
Article
Engineering, Electrical & Electronic
Zongkui Xie, Zhongqiang Wu
Summary: This paper proposes a distributed fault-tolerant secondary controller for DC microgrid to address the issue of unknown false data injection attacks. By designing a distributed extended state observer and a secondary controller, the system can achieve the control objectives of voltage regulation and current sharing.
INTERNATIONAL JOURNAL OF ELECTRICAL POWER & ENERGY SYSTEMS
(2023)
Review
Energy & Fuels
Amirhossein Solat, G. B. Gharehpetian, Mehdi Salay Naderi, Amjad Anvari-Moghaddam
Summary: This paper provides a comprehensive review of control strategies and defense mechanisms against cyber-attacks in microgrids (MGs). It discusses the operational conditions of MGs and presents appropriate control methods to ensure a safer mode. The common MGs communication system and the classification of cyber-attacks in MGs are described. Furthermore, the paper summarizes the existing research on prevention, detection, and isolation of cyber-attacks, as well as the control of MGs against such attacks. Finally, future trends in this field are discussed.
Article
Engineering, Electrical & Electronic
Ali Jafarian Abianeh, Mohammad Mehdi Mardani, Farzad Ferdowsi, Raju Gottumukkala, Tomislav Dragicevic
Summary: In this article, a cyber-resilient consensus-based distributed control scheme is proposed for islanded ac microgrids. The proposed scheme combines multiobjective sliding-mode control and communication link quality observer to provide reliable performance against false data injection attacks. This approach aims to form a localized solution without the need for transmission of extra signals in the secondary layer, enhancing system reliability and dynamic performance.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2022)
Article
Engineering, Electrical & Electronic
Subham Sahoo, Yongheng Yang, Frede Blaabjerg
Summary: This letter introduces a mitigation technique to remove stealth attacks on frequency control input in ac microgrids. The technique utilizes a novel event-driven attack-resilient controller for N cooperative grid-forming converters, ensuring resilient synchronization even when up to N-1 units are under attack. The resilience capabilities and robustness of the proposed controller are discussed and verified under various scenarios.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2021)
Article
Energy & Fuels
Luo Xu, Qinglai Guo, Guannan He, Hongbin Sun
Summary: This paper presents a study on the stability of inverter-based microgrids under fully synchronous distributed control, taking into account multiple time delays. The proposed stability criteria and algorithm are used to determine the stable interval of the synchronous control period for such cyber-physical power systems.
Article
Chemistry, Analytical
Yousof Barzegari, Jafar Zarei, Roozbeh Razavi-Far, Mehrdad Saif, Vasile Palade
Summary: This paper investigates the problem of false data injection attack (FDIA) detection in microgrids and proposes an algorithm based on sliding mode observers to estimate the states of neighbor agents. The proposed control scheme improves system resilience by using attack-resilient consensus rules. Through real-time simulation and experimental verification, the results show that the algorithm can effectively detect FDI attacks and protect consensus deviation from attacks.
Article
Automation & Control Systems
Mengxiang Liu, Chengcheng Zhao, Ruilong Deng, Peng Cheng, Jiming Chen
Summary: This article investigates a hierarchical control-based dc microgrid equipped with unknown input observer (UIO)-based detectors, focusing on potential false data injection (FDI) attacks and distributed countermeasures. It first identifies the vulnerability of UIO-based detectors and analyzes the impact of zero trace stealthy (ZTS) attacks on the voltage balancing and current sharing in the microgrid. To mitigate these attacks, an automatic and timely countermeasure based on dynamic average consensus (DAC) estimator is proposed, ensuring the integrity of communicated data. The detection and mitigation performance of the countermeasure are validated through extensive simulations.
IEEE TRANSACTIONS ON CONTROL OF NETWORK SYSTEMS
(2022)
Article
Engineering, Electrical & Electronic
Andreu Cecilia, Subham Sahoo, Tomislav Dragicevic, Ramon Costa-Castello, Frede Blaabjerg
Summary: This article proposes a distributed nonlinear observer approach that can robustly detect and reconstruct false data attacks in DC microgrids, even in the presence of unknown loads. The proposed method transforms the system into an observable form, implements a high-order sliding-mode observer to estimate system states and CPL, and then uses the estimation to reconstruct the attack signal. The robustness of this strategy is validated through numerical simulations and experimental prototypes under various uncertainties.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2021)
Article
Energy & Fuels
Dillip Kumar Mishra, Prakash Kumar Ray, Li Li, Jiangfeng Zhang, M. J. Hossain, Asit Mohanty
Summary: This study presents a resilience-based frequency regulation scheme for microgrids to adapt to different loads and wind speed patterns, considering a cyber-attack model to enhance system robustness. Experiments show that the fuzzy PID controller-based scheme exhibits better dynamic performance under cyber-attacks and parameter uncertainties.
Article
Engineering, Electrical & Electronic
Jiayang Wu, Sinan Li, Siew-Chong Tan, Shu Yuen Ron Hui
Summary: In order to achieve a wide voltage variation of EV battery packs, the traditional LLC converter needs to operate over a wide frequency range, which complicates the magnetics design and decreases efficiency. To solve this problem, a frequency folding technique is proposed and explained using a new LLC converter. The proposed converter utilizes both the inductive region and the capacitive region of the LLC converter during the charging process, effectively reducing the operating frequency and maintaining zero-voltage switching for higher overall efficiency. A detailed description of the design procedure for the proposed converter is provided. A scaled-down 400-W prototype with 200 V input and 120 V-210 V output range verified the advantages of the proposed concept and achieved a measured efficiency of 98% at maximum output power.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2023)
Article
Automation & Control Systems
Jiali Zhou, Zilin Li, Chi-Kwan Lee, Ka Wing Chan, Shu Yuen Ron Hui
Summary: The integration of power and information infrastructures in the smart grid requires more sensors and online monitoring systems on high-voltage transmission towers. These systems are typically powered by solar panels or wind turbines that are weather-dependent. This study proposes a weather-independent power supply solution that utilizes PCB resonators embedded in a 35-kV composite insulator to evaluate the complete system of energy harvesting, wireless power transfer, and output power stages. A coordinated control scheme of transmitter-side and receiver-side converters is proposed to regulate the constant current or constant voltage throughout the charging process, allowing the system to adjust output based on different battery charging profiles without wireless communication between the transmitter and receiver.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2023)
Article
Automation & Control Systems
Zhihong Yan, Ying Huang, Siew-Chong Tan, Chuyang Y. Tang, Shu Yuen Hui
Summary: In this article, a self-adaptive-step-size incremental-resistance MPPT technique is proposed to extract maximum power from RED stacks. It is simple and easy to implement, and realizes a balance between fast dynamic responses and small oscillations at a steady state. Various tests are conducted to validate the effectiveness of the proposed MPPT technique.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2023)
Article
Automation & Control Systems
Hui Wen Rebecca Liang, Yun Yang, Liangxi He, Jialong Qu, Chi Kwan Lee, Shu Yuen Ron Hui
Summary: This article proposes a multi-hysteresis temperature-regulated current control (MTRCC) technique that can improve battery charging speed without additional hardware costs. By dividing the hysteresis band of the conventional JEITA-compliant control into multiple segments, the number of charging current levels is increased, resulting in faster charging according to the analysis. This approach has the potential to be an alternative to the state-of-the-art TRCC in JEITA guidelines for single-cell charging applications. Empirical results demonstrate that the proposed MTRCC achieves faster charging than the conventional control at different ambient temperatures, with a more significant improvement at higher temperatures.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2023)
Article
Automation & Control Systems
Huawei Yuan, Hin Sang Lam, Neha Beniwal, Siew-Chong Tan, Josep Pou, Shu-Yuen Ron Hui
Summary: Capacitor voltage imbalance in NPC converters is a well-known problem, and existing solutions are either costly in terms of hardware or involve complex algorithms. This article proposes a new control method called direct-switch duty-cycle control (DSDCC) that addresses the issue and achieves near-optimal performance with simple implementation. By directly considering the duty cycles of switches, DSDCC can generate gating signals with only one carrier and derive near-optimal duty cycles, simplifying the controller design. Experimental results validate the effectiveness of DSDCC with a 5L-NPC converter.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Kerui Li, Jiayang Wu, Abdulkadir C. Yucel, Shu-Yuen Ron Hui
Summary: This study proposes a new printed-circuit-board (PCB) resonator structure for mega-hertz wireless power transfer. The novel design improves the resonant frequency, transmission efficiency, and resistance quality factor of the resonator, leading to significant performance enhancements compared to conventional designs.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Huawei Yuan, Hin Sang Lam, Neha Beniwal, Siew-Chong Tan, Josep Pou, Shu Yuen Ron Hui
Summary: This article proposes a voltage-balancing control solution for the MV-ES system through the cooperation of diode-clamped converters (DCCs) and dual active bridges (DABs). By taking advantage of the DABs in voltage balancing, the DCCs can adopt simple modulation to ensure grid-friendly voltage and current injection into the power grid.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2023)
Proceedings Paper
Engineering, Electrical & Electronic
Albert Ting Leung Lee, Kai Ting Wong, Siew-Chong Tan, Shu Yuen Ron Hui
Summary: This paper proposes a non-isolated single-stage single-inductor multiple-output (SIMO) buck-boost derived hybrid converter, which can provide concurrent mixed-mode DC-AC and DC-DC power conversions. It operates in pseudo-continuous conduction mode (PCCM) without extra freewheeling switches, simplifying circuit structure and increasing power efficiency. It can serve as a smart hybrid charger for Qi-enabled devices, offering fast and convenient wired and wireless power transfer.
2023 IEEE APPLIED POWER ELECTRONICS CONFERENCE AND EXPOSITION, APEC
(2023)
Article
Automation & Control Systems
Shu-Yuen Ron Hui, Albert T. L. Lee, Jiayang Wu, Siew Chong Tan
Summary: This article presents a novel dimmable technology for passive LED drivers by adding a switchable parallel capacitor to reduce power. The practical results confirm the effectiveness of this technology in real applications.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2023)
Article
Automation & Control Systems
Junming Zeng, Jiayang Wu, Kerui Li, Yun Yang, Shu Yuen Ron Hui
Summary: This article proposes a fast and accurate real-time estimation method for developing a dynamic battery circuit model on the primary side of a SS-compensated WPT system. By detecting the current of the transmitter resonator only, important parameters such as charging voltage, charging current, and state-of-charge can be accurately estimated in real time. The battery equivalent circuit can be transferred to the primary side for control.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2023)
Proceedings Paper
Engineering, Electrical & Electronic
Jiayang Wu, Albert T. L. Lee, Siew-Chong Tan, S. Y. (Ron) Hui
Summary: This paper proposes a bridgeless single-inductor multiple-output (SIMO) AC-AC power converter that uses only one inductor to produce multiple independent AC output voltages. Each output can be controlled independently and is connected to a transmitting coil to form a multi-coil wireless power transfer system. The proposed topology offers the advantages of a small component count, low cost, simple control scheme, scalability, and high power efficiency.
2023 IEEE WIRELESS POWER TECHNOLOGY CONFERENCE AND EXPO, WPTCE
(2023)
