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Due to the importance of reliability and security in DC microgrids, it is essential to provide maximum resilience against cyber-attacks. However, insufficient global information in the microgrid makes it difficult to accurately identify the location of these attacks. To address these issues, this paper develops a novel resilient distributed control mechanism, which ensures average voltage regulation and proportional load sharing in DC microgrids under unknown cyber-attacks. The proposed resilient control design does not require any information regarding the nature or location of the attacks. By virtue of a graph theoretical approach and a Lyapunov-based framework, the proposed resilient distributed control strategy is designed in a way such that the system stability is always guaranteed following a comprehensive design mechanism. Finally, the robustness of the proposed resilient distributed control approach is demonstrated via simulations and validated by experimental results.
Mahdieh S. Sadabadi; Subham Sahoo; Frede Blaabjerg. Stability Oriented Design of Cyber Attack Resilient Controllers for Cooperative DC Microgrids. IEEE Transactions on Power Electronics 2021, PP, 1 -1.
AMA StyleMahdieh S. Sadabadi, Subham Sahoo, Frede Blaabjerg. Stability Oriented Design of Cyber Attack Resilient Controllers for Cooperative DC Microgrids. IEEE Transactions on Power Electronics. 2021; PP (99):1-1.
Chicago/Turabian StyleMahdieh S. Sadabadi; Subham Sahoo; Frede Blaabjerg. 2021. "Stability Oriented Design of Cyber Attack Resilient Controllers for Cooperative DC Microgrids." IEEE Transactions on Power Electronics PP, no. 99: 1-1.
The extensive use of electric vehicles (EVs) can reduce concerns about climate change and fossil fuel shortages. One of the main obstacles to accepting EVs is the limitation of charging stations, which consists of high-charge batteries and high-energy charging infrastructure. A new transformer-less topology for boost dc-dc converters with higher power density and lower switch stress is proposed in this paper, which may be a suitable candidate for high-power fast-charging battery chargers of EVs. Throughout this paper, two operating modes of the proposed converter, continuous current mode (CCM) and discontinuous current mode (DCM), are analyzed in detail. Additionally, critical inductances and design considerations for the proposed converter are calculated. Finally, real-time verifications based on hardware-in-loop (HiL) simulation are carried out to assess the correctness of the proposed theoretical concepts.
Farzad Shahir; Meysam Gheisarnejad; Mahdieh Sadabadi; Mohammad-Hassan Khooban. A New Off-Board Electrical Vehicle Battery Charger: Topology, Analysis and Design. Designs 2021, 5, 51 .
AMA StyleFarzad Shahir, Meysam Gheisarnejad, Mahdieh Sadabadi, Mohammad-Hassan Khooban. A New Off-Board Electrical Vehicle Battery Charger: Topology, Analysis and Design. Designs. 2021; 5 (3):51.
Chicago/Turabian StyleFarzad Shahir; Meysam Gheisarnejad; Mahdieh Sadabadi; Mohammad-Hassan Khooban. 2021. "A New Off-Board Electrical Vehicle Battery Charger: Topology, Analysis and Design." Designs 5, no. 3: 51.
This paper presents a vector current controller (in the synchronous reference, or the dq, frame) with negative-sequence current injection capability for three-phase grid-connected converters. This capability is desired for the operation of the converter during unbalanced conditions and also for a certain type of islanding detection. The proposed controller first determines the double-frequency current references and then uses a sixth-order two-input two-output proportional-integral-resonance (PIR) structure, which is optimally designed. Compared with the existing similar approaches, the proposed controller has a simpler structure and more robust performance, e.g., against system parameter uncertainties and weak grid conditions. The proposed controller is developed for converters with both the L-type and
Houshang Karimi; Aboutaleb Haddadi; Masoud Karimi-Ghartemani; Mahdieh Sadabadi. A Robust Vector Current Controller with Negative-Sequence Current Capability for Grid-Connected Inverters. Energies 2021, 14, 4549 .
AMA StyleHoushang Karimi, Aboutaleb Haddadi, Masoud Karimi-Ghartemani, Mahdieh Sadabadi. A Robust Vector Current Controller with Negative-Sequence Current Capability for Grid-Connected Inverters. Energies. 2021; 14 (15):4549.
Chicago/Turabian StyleHoushang Karimi; Aboutaleb Haddadi; Masoud Karimi-Ghartemani; Mahdieh Sadabadi. 2021. "A Robust Vector Current Controller with Negative-Sequence Current Capability for Grid-Connected Inverters." Energies 14, no. 15: 4549.
This letter focuses on resilient synchronization in networked AC microgrids under cyber-attacks, where attackers aim to desynchronize converters by injecting bounded false data to communication and control channels. To this end, a resilient cooperative control framework for the secondary frequency regulation in AC microgrids is developed. The proposed resilient distributed control strategy achieves synchronization regardless of the existence of cyber-attacks. Moreover, it offers the maximum level of resilience, i.e. it guarantees resilient synchronization even if all distributed generation units in microgrids are subject to cyber-attacks. Theoretical analysis and verification case studies are carried out in order to demonstrate the advantages and performance of the proposed resilient cooperative control.
Mahdieh S. Sadabadi; Subham Sahoo; Frede Blaabjerg. A Fully Resilient Cyber-Secure Synchronization Strategy for AC Microgrids. IEEE Transactions on Power Electronics 2021, 36, 13372 -13378.
AMA StyleMahdieh S. Sadabadi, Subham Sahoo, Frede Blaabjerg. A Fully Resilient Cyber-Secure Synchronization Strategy for AC Microgrids. IEEE Transactions on Power Electronics. 2021; 36 (12):13372-13378.
Chicago/Turabian StyleMahdieh S. Sadabadi; Subham Sahoo; Frede Blaabjerg. 2021. "A Fully Resilient Cyber-Secure Synchronization Strategy for AC Microgrids." IEEE Transactions on Power Electronics 36, no. 12: 13372-13378.
This paper deals with the stabilizability problem of liner parameter varying (LPV) systems. It is assumed that LPV models affinely depend on time-varying uncertain and time-invariant design parameters. The uncertain parameters, their time-derivations, and design parameters belong to polygonal convex spaces. The stabilizability problem of such systems is studied. Extending the stability conditions to stabilizability conditions generally causes nonlinearity issues due to the coupling between the Lyapunov and design variables. To cope with this issue, a design space exploration algorithm (DSEA) is proposed to accurately determine the design parameters with a feasibility performance similar to stability analysis approaches. DSEA removes the undesired parts of the design subspace that cannot stabilize the model. Then, it checks the corner points of the remaining subspaces to find a stabilizing point. This procedure continues until a stabilizing point is found or the whole design subspaces are detected to be undesirable. Three hundred random LPV systems are generated to compare the feasibility performance of DSEA with existing approaches. Also, the proposed approach is used to stabilize the LPV model of a microgrid consisting of several distributed generation units and energy storage systems. The simulation results show the superiority of DSEA over the existing approaches.
Roozbeh Abolpour; Maryam Dehghani; Mahdieh S. Sadabadi. Designing controller parameters of an LPV system via design space exploration. European Journal of Control 2021, 59, 47 -57.
AMA StyleRoozbeh Abolpour, Maryam Dehghani, Mahdieh S. Sadabadi. Designing controller parameters of an LPV system via design space exploration. European Journal of Control. 2021; 59 ():47-57.
Chicago/Turabian StyleRoozbeh Abolpour; Maryam Dehghani; Mahdieh S. Sadabadi. 2021. "Designing controller parameters of an LPV system via design space exploration." European Journal of Control 59, no. : 47-57.
In this article, a decentralized scalable voltage control approach for islanded dc microgrids with a general structure is proposed. The microgrid system under study comprises several distributed generation (DG) units, every one containing an uncertain local ZIP [constant impedance (Z), constant current (I), and constant power (P)] load. We propose a voltage control strategy that ensures robust desired performance of the closed-loop islanded dc microgrid in addition to the robust stability under different uncertainty sources, including uncertain ZIP loads, topological changes, and plug-and-play functionality of DGs. The presented approach does not impose any restrictions on the dynamics of the distribution lines connecting different DG units. In the proposed control scheme, each local controller is the solution of a single convex optimization problem, which leads to the optimal performance of the dc microgrid. At first, an LTI state-space model with polytopic uncertainty is developed for islanded dc microgrid with different uncertainty sources. Then, a robust dynamic output-feedback-based controller with ${{\bm{H}}_\infty }$ performance criterion is proposed for the satisfaction of all control objectives. The final obtained problem is turned into an LMI-based optimization problem. Different scenarios are simulated in MATLAB to affirm the feasibility and efficiency of the proposed control technique in the dc microgrids.
Marjan Shafiee-Rad; Mahdieh S. Sadabadi; Qobad Shafiee; Mohammad Reza Jahed-Motlagh. Robust Performance Satisfaction of DC Microgrids Using a Decentralized Optimal Voltage Control Strategy. IEEE Systems Journal 2021, PP, 1 -11.
AMA StyleMarjan Shafiee-Rad, Mahdieh S. Sadabadi, Qobad Shafiee, Mohammad Reza Jahed-Motlagh. Robust Performance Satisfaction of DC Microgrids Using a Decentralized Optimal Voltage Control Strategy. IEEE Systems Journal. 2021; PP (99):1-11.
Chicago/Turabian StyleMarjan Shafiee-Rad; Mahdieh S. Sadabadi; Qobad Shafiee; Mohammad Reza Jahed-Motlagh. 2021. "Robust Performance Satisfaction of DC Microgrids Using a Decentralized Optimal Voltage Control Strategy." IEEE Systems Journal PP, no. 99: 1-11.
The plug-and-play nature of distributed generation (DG) units in converter-interfaced microgrids imposes significant challenges from the control point of view, mainly caused by the time-varying microgrid structure. In this paper, we propose a systematic plug-and-play decentralized voltage control solution for DC microgrids. The proposed control approach guarantees the stable operation and satisfactory performance of microgrids under the arbitrary interconnection of DG units. Based on the Lyapunov method, concise stability and L2 gain voltage tracking performance certificates for DC microgrids are derived. The main feature of the proposed control approach is the decentralized design of local voltage controllers in DC microgrods. The proposed voltage control framework is applied to a case study of a multiple-DG DC microgrid in MATLAB/Simscape Electrical environment.
Mahdieh S. Sadabadi. Line-Independent Plug-and-Play Voltage Stabilization and ℒ₂ Gain Performance of DC Microgrids. IEEE Control Systems Letters 2020, 5, 1609 -1614.
AMA StyleMahdieh S. Sadabadi. Line-Independent Plug-and-Play Voltage Stabilization and ℒ₂ Gain Performance of DC Microgrids. IEEE Control Systems Letters. 2020; 5 (5):1609-1614.
Chicago/Turabian StyleMahdieh S. Sadabadi. 2020. "Line-Independent Plug-and-Play Voltage Stabilization and ℒ₂ Gain Performance of DC Microgrids." IEEE Control Systems Letters 5, no. 5: 1609-1614.
This letter addresses the problem of voltage regulation and balanced current sharing in a parallel connection of heterogeneous DC-DC converters sharing a common ZIP (constant impedance, constant current, and constant power) load. To this end, a distributed dynamic control approach is developed. The proposed control approach does not rely on the load profile and the number of active converters. The paper describes theoretical aspects in rigorous Lyapunov-based stability analysis, load-independent characteristic, scalability, and plug-and-play feature of the control design, and verifies the performance of the proposed control mechanism via simulation case studies in MATLAB/Simscape Electrical environment.
Mahdieh S. Sadabadi. A Distributed Control Strategy for Parallel DC-DC Converters. IEEE Control Systems Letters 2020, 5, 1231 -1236.
AMA StyleMahdieh S. Sadabadi. A Distributed Control Strategy for Parallel DC-DC Converters. IEEE Control Systems Letters. 2020; 5 (4):1231-1236.
Chicago/Turabian StyleMahdieh S. Sadabadi. 2020. "A Distributed Control Strategy for Parallel DC-DC Converters." IEEE Control Systems Letters 5, no. 4: 1231-1236.
Increasing the number of grid-connected inverters in power systems imposes several challenges. One of the main challenges is the complexity and uncertainty of the dynamical model of the inverters due to the large numbers of grid-connected inverters and disconnection of inverters. To address this challenge, we present a scalable direct-quadrature current control strategy for parallel voltage source inverters in a rotating reference frame. The control structure is based on a decentralized multivariable proportional integral (PI) current control mechanism and provides stability and zero steady-state errors. The proposed control approach has the main advantages of flexibility, allowing disconnection/connection of inverters on the basis of the required power level. The effectiveness of the proposed vector current control strategy is evaluated through simulation case studies in MATLAB/Simscape Electrical.
Mahdieh S. Sadabadi; Qobad Shafiee. Decentralized Multivariable Vector Current Control of Grid-connected Voltage Source Inverters. IFAC-PapersOnLine 2020, 53, 12410 -12415.
AMA StyleMahdieh S. Sadabadi, Qobad Shafiee. Decentralized Multivariable Vector Current Control of Grid-connected Voltage Source Inverters. IFAC-PapersOnLine. 2020; 53 (2):12410-12415.
Chicago/Turabian StyleMahdieh S. Sadabadi; Qobad Shafiee. 2020. "Decentralized Multivariable Vector Current Control of Grid-connected Voltage Source Inverters." IFAC-PapersOnLine 53, no. 2: 12410-12415.
This paper addresses the problem of decentralized PI-based voltage stabilization in islanded DC microgrids with DC-DC buck converters. We propose a voltage control approach with a decentralized PI control structure. The proposed voltage control design is scalable and does not rely on the global model of the microgrids and parameters of the distribution lines. Moreover, it guarantees the asymptotic stability of the DC microgrid systems. The scalability of the design and asymptotic stability are ensured by the use of a separable quadratic-type Lyapunov function, with a fixed-structure Lyapunov matrix, as well as the LaSalle’s invariance principle. The effectiveness of the proposed voltage control strategy is evaluated through simulation case studies.
Mahdieh S. Sadabadi; Qobad Shafiee. Scalable PI Voltage Stabilization in DC Microgrids. IFAC-PapersOnLine 2020, 53, 12882 -12887.
AMA StyleMahdieh S. Sadabadi, Qobad Shafiee. Scalable PI Voltage Stabilization in DC Microgrids. IFAC-PapersOnLine. 2020; 53 (2):12882-12887.
Chicago/Turabian StyleMahdieh S. Sadabadi; Qobad Shafiee. 2020. "Scalable PI Voltage Stabilization in DC Microgrids." IFAC-PapersOnLine 53, no. 2: 12882-12887.
Constant power loads (CPLs) impose instability issues in DC microgrids due to their negative impedance characteristics. This paper studies the problem of voltage control design of DC microgrids with CPLs. It is assumed that the power of CPLs is uncertain and belongs to a given interval leading to an infinite number of equilibrium points of the system. We develop a polytope model for DC microgrids with uncertain CPLs. Using this model, a robust two-degree-of-freedom (2DOF) feedback-feedforward voltage control framework is then proposed. The voltage controller is obtained by a solution of a set of linear matrix inequalities. The voltage control design strategy for each distributed generation (DG) unit is scalable and independent of the other DGs. The effectiveness of the proposed control approach is evaluated through simulation studies in MATLAB/SimPowerSystems Toolbox.
Mahdieh S. SadAbadi; Qobad Shafiee. Scalable Robust Voltage Control of DC Microgrids With Uncertain Constant Power Loads. IEEE Transactions on Power Systems 2019, 35, 508 -515.
AMA StyleMahdieh S. SadAbadi, Qobad Shafiee. Scalable Robust Voltage Control of DC Microgrids With Uncertain Constant Power Loads. IEEE Transactions on Power Systems. 2019; 35 (1):508-515.
Chicago/Turabian StyleMahdieh S. SadAbadi; Qobad Shafiee. 2019. "Scalable Robust Voltage Control of DC Microgrids With Uncertain Constant Power Loads." IEEE Transactions on Power Systems 35, no. 1: 508-515.
The purpose of this paper is to explore the applicability of linear time-invariant (LTI) dynamical systems with polytopic uncertainty for modeling and control of islanded DC microgrids under plug-and-play (PnP) functionality of distributed generations (DGs). We develop a robust decentralized voltage control framework to ensure robust stability and reliable operation for islanded DC microgrids. The problem of voltage control of islanded DC microrgids with PnP operation of DGs is formulated as a convex optimization problem with structural constraints on some decision variables. The proposed control scheme offers several advantages including decentralized voltage control with no communication link, transient stability/performance, plug-and-play capability, scalability of design, applicability to microgrids with general topology, and robustness to microgrid uncertainties. The effectiveness of the proposed control approach is evaluated through simulation studies carried out in MATLAB/SimPowerSystems Toolbox.
Mahdieh S. SadAbadi; Qobad Shafiee; Alireza Karimi. Plug-and-Play Robust Voltage Control of DC Microgrids. IEEE Transactions on Smart Grid 2017, 9, 6886 -6896.
AMA StyleMahdieh S. SadAbadi, Qobad Shafiee, Alireza Karimi. Plug-and-Play Robust Voltage Control of DC Microgrids. IEEE Transactions on Smart Grid. 2017; 9 (6):6886-6896.
Chicago/Turabian StyleMahdieh S. SadAbadi; Qobad Shafiee; Alireza Karimi. 2017. "Plug-and-Play Robust Voltage Control of DC Microgrids." IEEE Transactions on Smart Grid 9, no. 6: 6886-6896.
This paper proposes a decentralized control strategy for the voltage regulation of islanded inverter-interfaced microgrids. We show that an inverter-interfaced microgrid under plug-and-play (PnP) functionality of distributed generations (DGs) can be cast as a linear time-invariant system subject to polytopic-type uncertainty. Then, by virtue of this novel description and use of the results from theory of robust control, the microgrid control system guarantees stability and a desired performance even in the case of PnP operation of DGs. The robust controller is a solution of a convex optimization problem. The main properties of the proposed controller are that: 1) it is fully decentralized and local controllers of DGs that use only local measurements; 2) the controller guarantees the stability of the overall system; 3) the controller allows PnP functionality of DGs in microgrids; and 4) the controller is robust against microgrid topology change. Various case studies, based on time-domain simulations in MATLAB/SimPowerSystems Toolbox, are carried out to evaluate the performance of the proposed control strategy in terms of voltage tracking, microgrid topology change, PnP capability features, and load changes.
Mahdieh S. SadAbadi; Qobad Shafiee; Alireza Karimi. Plug-and-Play Voltage Stabilization in Inverter-Interfaced Microgrids via a Robust Control Strategy. IEEE Transactions on Control Systems Technology 2016, 25, 781 -791.
AMA StyleMahdieh S. SadAbadi, Qobad Shafiee, Alireza Karimi. Plug-and-Play Voltage Stabilization in Inverter-Interfaced Microgrids via a Robust Control Strategy. IEEE Transactions on Control Systems Technology. 2016; 25 (3):781-791.
Chicago/Turabian StyleMahdieh S. SadAbadi; Qobad Shafiee; Alireza Karimi. 2016. "Plug-and-Play Voltage Stabilization in Inverter-Interfaced Microgrids via a Robust Control Strategy." IEEE Transactions on Control Systems Technology 25, no. 3: 781-791.