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CPSS Transactions on power electronics and Applications 2024年第1期9卷 112-125页

作者： Liu, Sucheng Fang, Chao Huang, Xuefeng Zhang, Qianjin Fang, Wei Liu, Xiaodong Anhui University of Technology Anhui Provincial Key Laboratory of Power Electronics and Motion Control Ma'anshan243032 China

DC microgrid cluster (DCMGC) is a dynamic network formed by connecting a group of geographically neighboring DC microgrids (DCMGs) through tie-lines. Each DCMG collaborates with other DCMGs to achieve maximum economic benefits through flexible power flow management within the DCMG and at the system level. Therefore, DCMGCs require communication, computing, and control to manage the power flow. As a result, the DCMGCs are naturally represented as cyber-physical systems (CPSs). However, DCMGCs are of high penetration of distributed energy resources, which creates significant randomness at both resource and load sides. Consequently, these systems will experience large disturbances leading to serious stability problems like high oscillations or even collapse. In this paper, Takagi-Sugeno (T-S) modeling is utilized to reduce the large signal Lyapunov stability of DCMGs to a series of linear matrix inequalities (LMIs). The impact of key circuit parameters, control parameters, communication delay, and cyber-attacks on the large signal stability of DCMGCs is revealed, and the region of attraction (ROA) of the network is estimated as well. Finally, the large signal stability analysis is verified by experimental results. The findings of this work will be instrumental in developing more effective control strategies to enhance the stability and reliability of DCMGCs. © 2017 CPSS.

关键词： Cyber Physical System

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Detection and Mitigation via Alternative Data for False Data Injection Attacks in DC Microgrid Cluster

CPSS Transactions on Power Electronics and Applications

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CPSS Transactions on power electronics and Applications 2024年第1期9卷 27-38页

作者： Liu, Sucheng Hu, Guanggan Xia, Mengyu Zhang, Qianjin Fang, Wei Liu, Xiaodong Anhui University of Technology Anhui Provincial Key Laboratory of Power Electronics and Motion Control Ma'anshan243032 China

DC microgrid clusters (DCMGCs), as deeply integrated cyber-physical systems, are formed by interconnection of multiple DC microgrids, and use distributed control to achieve power distribution with high reliability and scalability, and further reflect advantages of distributed energy resources-based generations. However, sharing of information among control agents by distributed manner in the DCMGCs renders the systems vulnerable to cyber-attacks. Among various cyber-attacks, false data injection attacks (FDIAs) can be carefully designed as stealth attacks, which can cause errors in the power management of DC-MGCs without manifestation of instability phenomena and even mislead existing detection methods to make incorrect judgments. To address this issue, this paper presents an alternative data-based strategy to detect FDIAs and mitigate the impact of the attacks in cyber network of DCMGCs. The classification conditions of FDIAs are discussed according to the different responses of DC-MGCs to the attacks. Furthermore, the core detection problem is transformed into identifying whether the system outputs match by selecting alternative communication data to circumvent complex modeling. Finally, hardware-in-the-loop experimental results on the dSPACE™ MicrolabBox platform with universal digital signal processing (DSP) controllers validate the proposed strategy. © 2017 CPSS.

关键词： Electric power distribution

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Modeling of Small-Signal Impedance for DC Microgrids with Distributed Hierarchical control 10

Modeling of Small-Signal Impedance for DC Microgrids with Di...

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10th IEEE International power electronics and motion control Conference, IPEMC 2024 ECCE Asia

作者： Hong, Tao Liu, Sucheng Zhou, Taohu Li, Long Zhang, Qianjin Liu, Xiaodong Anhui University of Technology Anhui Provincial Key Laboratory of Power Electronics and Motion Control Ma'Anshan China

ISBN: (纸本)9798350351330

DC microgrids in general consist of multiple heterogeneous units, including distributed energy resources (DERs), energy storage systems (ESSs), and local loads. Due to the high penetration of DERs and high adoption of power electronic converters, DC microgrids behave as weak grids with low inertia and high output impedance. Small-signal stability is therefore highly critical to DC microgrids. The impedance-based tools are widely accepted for small-signal stability analysis. However, the bus impedance characteristics of DC microgrids remains an open research topic, especially with the background of distributed hierarchical control scheme. This work focuses on the modeling of small-signal impedance for DC microgrids with distributed hierarchical control, and the effects of the control and time-delays will be revealed. The derived small-signal impedance models are validated by both simulations and experimental results. © 2024 IEEE.

关键词： Energy resources

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Research on Backflow power of Three-Port Converter Applied to Optical Storage Straight Soft 2

Research on Backflow Power of Three-Port Converter Applied t...

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2nd IEEE International power electronics and Application Symposium, PEAS 2023

作者： Qin, Zhiyuan Liu, Xiaodong Li, Zhenhui Zhang, Qianjin Liu, Sucheng Fang, Wei Anhui University of Technology Provincial Key Laboratory of Power Electronics and Motion Control Maanshan China

ISBN: (纸本)9798350313765

With the degree of electrification in rural areas is greatly improved, the establishment of photovoltaic, energy storage integration of 'optical storage straight soft' system in rural areas, can be used as a pilot target to achieve zero carbon. The three-port converter is the core of the 'optical storage straight soft'. It not only has the characteristics of flexible buck-boost of bidirectional Buck-Boost circuit and bidirectional power flow of dual active bridge circuit, but also has simple structure and high integration. However, due to the integration with dual active bridge (DAB), backflow power (BP) is generated during operation. The existence of backflow power (BP) will increase the switching loss and reduce the conversion efficiency. In order to further improve the conversion efficiency, this paper proposes a parameter optimization method with zero backflow power in a certain working range for the problem of backflow power (BP) in the three-port converter under PWM plus double phase shift control. © 2023 IEEE.

关键词： backflow power optical storage straight soft parameter optimization Three-port converter

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Event-Triggered Predictive Function control of DC Microgrid Clusters

Event-Triggered Predictive Function Control of DC Microgrid ...

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2023 IEEE International Conference on Predictive control of Electrical Drives and power electronics, PRECEDE 2023

作者： Zhou, Taohu Zhang, Qianjin Liu, Sucheng Fang, Wei Diao, Jixiang Liu, Xiaodong Anhui University of Technology Anhui Province Key Laboratory of Power Electronics and Motion Control Ma'anshan China

ISBN: (纸本)9798350396867

DC microgrid cluster (DCMGC) is a dynamic network of multiple DC microgrids (DCMGs) that interconnected through tie-lines. By effective power flow control among the interconnected multiple DCMGs, the overall DCMGC is capable of achieving the most in terms of reliability, efficiency, and cost reduction. But the high penetration of distributed energy resources and power electronics converters render the control design of the complex DCMGCs a challenge task. The model predictive control (MPC) has been proven as a promising solution in the control of DCMGCs. However, the mechanism of the receding horizon optimization of MPC impose much stress onto the online computation and leads to the waste of communication resources as well, especially in the steady-state operation of the systems. To address this issue, an event-triggering is added to the MPC algorithm in the power flow control of DCMGCs, and the control command is only updated subject to the triggering events. Hence, the high frequency constant online computation and optimization will be significantly reduced. A hardware-in-the-loop (HIL) prototype of the DCMGC that consists of three DCMGs is built to verify the feasibility of the proposed method. © 2023 IEEE.

关键词： Model predictive control

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A NARX Neural Network-Based Predictive control for power Management of DC Microgrid Clusters

A NARX Neural Network-Based Predictive Control for Power Man...

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2023 IEEE International Conference on Predictive control of Electrical Drives and power electronics, PRECEDE 2023

作者： Diao, Jixiang Zhang, Qianjin Liu, Sucheng Fang, Wei Huang, Xuefeng Liu, Xiaodong Anhui University of Technology Anhui Province Key Laboratory of Power Electronics and Motion Control Ma'anshan China

ISBN: (纸本)9798350396867

DC microgrid clusters (DCMGCs) are a network of interconnected DC microgrids that work collaboratively to enhance resilience, reliability and optimize the economic benefits of the systems. However, due to the intricate dynamics of high order and nonlinearities, modeling for controller design can be an overwhelming task. To overcome this issue, this paper proposes a data-driven predictive control approach to regulate the power flow of DCMGCs. The proposed method employs a nonlinear autoregressive network with exogenous inputs (NARX) neural network, which does not rely on analytical modeling. Instead, the prediction model is obtained by fitting and training the system data. Consequently, the control objectives of DCMGCs can be achieved intelligently using this model-free approach. The hardware-in-the-loop (HIL) prototype of the DCMGC based on dSPACETM MicrolabBox and Microcontroller STM32 is built, and the proposed method is verified by HIL experiments. © 2023 IEEE.

关键词： controllers

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Transient Stability Analysis of Inverters Considering Synchronization and DC Voltage control Interaction 10

Transient Stability Analysis of Inverters Considering Synchr...

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10th IEEE International power electronics and motion control Conference, IPEMC 2024 ECCE Asia

作者： Hu, Qi Zhang, Qianjin Sun, Siwei Mei, Dikui Liu, Sucheng Liu, Xiaodong Fang, Wei Wang, Shijing Anhui University of Technology Anhui Provincial Key Laboratory of Power Electronics and Motion Control Ma'Anshan China State Grid Anhui Wuhu Power Supply Company State Grid Wuhu China

ISBN: (纸本)9798350351330

Renewable power generation is constituting a new power system. However, the system stability is influenced by the increasing proportion of power converters. The transient stability involves system nonlinear characteristics and is difficult to analyze. The Takagi-Sugeno (T-S) fuzzy model has been used to facilitate the transient stability analysis of synchronization control. However, in two-stage inverters, the time scale of DC voltage control overlaps with that of the synchronization control. System stability should be discussed considering these two control dynamics. This paper investigates the large-signal stability of two-stage grid-connected inverters in the synchronization control time scale. The T-S fuzzy model is established considering the dynamics of DC voltage and synchronization control. The Lyapunov stability and the domain of attraction (DOA) are discussed for different system parameters. Finally, simulation verifies the effectiveness of the model and stability analysis. © 2024 IEEE.

关键词： Electric inverters

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A Multi-load Parity-Time Symmetric Wireless power Transmission System Inspired by Non-Hermitian Physics

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IEEE Journal of Emerging and Selected Topics in power electronics 2025年

作者： Xu, Biao-Biao Wu, Zi-Xuan Wen, You-Long Ma, Xiao-San Cheng, Mu-Tian Anhui University of Technology Anhui Provincial Key Lab of Power Electronics & Motion Control School of Electrical Engineering & Information Maanshan243002 China

We designed a novel multi-load Parity-Time (PT) symmetry wireless power transmission (WPT) system inspired by non-Hermitian physics. This system can selectively and robustly transfer energy across multiple loads. Firstly, a new coil structure was designed to enable the system to operate in six modes and the system in different modes all belong to the PT system. Secondly, a variable operating frequency and monitoring device were designed based on the frequency characteristics of the PT-WPT system. The system can selectively operate in any mode based on the operating frequency of the transmitting device. Furthermore, the coupled receiving coils of the system are different in different operating modes. Finally, the selection of the receiving coil and load can be achieved by simply changing the operating frequency of the transmitting device. The experimental results indicate that the system exhibits insensitivity to internal interference and can concentrate the transmitted energy on one load by changing the operating mode, achieving robust directional energy transfer. There is almost no influence between the internal coils and the system can maintain stable energy transmission when any coil in the system is misaligned horizontally, vertically, or at an angle. © 2013 IEEE.

关键词： Inductive power transmission

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An Improved Sampled-Data-Based Event-Triggered Distributed Secondary control for DC Microgrids 3

An Improved Sampled-Data-Based Event-Triggered Distributed S...

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3rd IEEE International power electronics and Application Conference and Exposition, PEAC 2022

作者： Chen, Li Liu, Sucheng Hu, Guanggan Zhang, Qianjin Fang, Wei Liu, Xiaodong Anhui University of Technology Anhui Province Key Laboratory of Power Electronics and Motion Control Ma'anshan China

ISBN: (数字)9781665491419

ISBN: (纸本)9781665491419

In DC microgrids, hierarchical control that is always time-triggered, has been successfully adopted to achieve multiple control objectives with decoupled design at different timescales. Recently, the event-triggered control schemes have been emerged with primary benefit of saving communication resources when compared with conventional time-triggered ones. However, general event-triggered control schemes are in a continuous state, which are not in line with the actual application of digital signal processors. To address this issue, a sampled-data-based event-triggered distributed secondary control strategy is proposed, which updates the control and transmits local information to neighbors only when event triggering condition based on sampling period is violated, and Zeno behavior with infinite number of triggering in a finite time can be excluded as well. The sufficient conditions for the stability of the control strategy are derived by Lyapunov functional method for both fixed and switched communication topologies. Finally, the simulation model is built in MATlab/Simulink environment to validate the proposed strategy. © 2022 IEEE.

关键词： Digital signal processors

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Impedance-Based Small-Signal Stability Analysis of DC Microgrid Clusters 3

Impedance-Based Small-Signal Stability Analysis of DC Microg...

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3rd IEEE International power electronics and Application Conference and Exposition, PEAC 2022

作者： Yang, Liu Zhang, Qianjin Liu, Sucheng Fang, Wei Zhou, Tao Liu, Xiaodong Anhui University of Technology Anhui Province Key Laboratory of Power Electronics and Motion Control Ma'anshan China

ISBN: (数字)9781665491419

ISBN: (纸本)9781665491419

DC microgrid clusters (DCMGCs) that consist of interconnected multiple DC microgrids (DCMGs) point out future evolution of microgrid (MG)-based distributed power systems. Stability is an essential requirement to ensure such complex networks as DCMGCs in safe and reliable operations. However, there are only few works dedicated to stability investigation of DCMGCs. This work proposes an impedance-based small-signal stability analysis for DCMGCs. The small-signal impedance model of the DCMGC is derived, and the stability of the system is investigated through the impedance eigenvalue. The identified unstable conditions by the pole-zero maps are verified by simulation results. © 2022 IEEE.

关键词： Eigenvalues and eigenfunctions

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