This paper develops a resilient distributed control mechanism that ensures voltage regulation and... more This paper develops a resilient distributed control mechanism that ensures voltage regulation and proportional current sharing in DC microgrids while under unknown cyber-attacks. The attackers are assumed to inject false data to the actuators of microgrid control systems. The proposed resilient control algorithm steers the DC microgrid as close as possible to the desired equilibrium regardless of the potential unknown attacks and guarantees average voltage regulation and proportional current sharing in DC microgrids. The proposed resilient control design does not require any knowledge on the nature or the locations of cyber-attacks. By virtue of a graph theoretical approach and a Lyapunov-based framework, it is shown that the proposed resilient control strategy guarantees the stability of DC microgrids. The efficiency and resilience of the proposed distributed control approach is demonstrated via simulation scenarios on a DC microgrid consisting of eight distributed generation units while under attack.
The extensive use of electric vehicles (EVs) can reduce concerns about climate change and fossil ... more 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.
Determination of the order of a model is the key first step towards modeling any dynamic systems,... more Determination of the order of a model is the key first step towards modeling any dynamic systems, particularly two-dimensional processes. In this paper, a new method for two-dimensional (2-D) Gaussian ARMA model order determination is proposed. In the proposed method, the AR and MA orders are first independently determined, then the procedure for model order determination of the 2-D ARMA model is outlined. The model is assumed to be causal, stable, linear, and spatial shift-invariant with p(1) x p(2) quarter-plane (QP) support. Numerical simulations are presented to show the effectiveness of the proposed new approach.
This paper develops a resilient distributed control mechanism that ensures voltage regulation and... more This paper develops a resilient distributed control mechanism that ensures voltage regulation and proportional current sharing in DC microgrids while under unknown cyber-attacks. The attackers are assumed to inject false data to the actuators of microgrid control systems. The proposed resilient control algorithm steers the DC microgrid as close as possible to the desired equilibrium regardless of the potential unknown attacks and guarantees average voltage regulation and proportional current sharing in DC microgrids. The proposed resilient control design does not require any knowledge on the nature or the locations of cyber-attacks. By virtue of a graph theoretical approach and a Lyapunov-based framework, it is shown that the proposed resilient control strategy guarantees the stability of DC microgrids. The efficiency and resilience of the proposed distributed control approach is demonstrated via simulation scenarios on a DC microgrid consisting of eight distributed generation units while under attack.
The extensive use of electric vehicles (EVs) can reduce concerns about climate change and fossil ... more 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.
Determination of the order of a model is the key first step towards modeling any dynamic systems,... more Determination of the order of a model is the key first step towards modeling any dynamic systems, particularly two-dimensional processes. In this paper, a new method for two-dimensional (2-D) Gaussian ARMA model order determination is proposed. In the proposed method, the AR and MA orders are first independently determined, then the procedure for model order determination of the 2-D ARMA model is outlined. The model is assumed to be causal, stable, linear, and spatial shift-invariant with p(1) x p(2) quarter-plane (QP) support. Numerical simulations are presented to show the effectiveness of the proposed new approach.
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Papers by Mahdieh Sadabadi