Papers by Rashid Alammari
Protection and Control of Modern Power Systems
The conventional power systems are evolving as smart grids. In recent times cyberattacks on smart... more The conventional power systems are evolving as smart grids. In recent times cyberattacks on smart grids have been increasing. Among different attacks, False Data Injection (FDI) is considered as an emerging threat that has significant impact. By exploiting the vulnerabilities of IEC 61850 Generic Object-Oriented Substation Events (GOOSE) and Sampled Values (SV) attackers can launch different FDI attacks. In this paper, a real-time set up capable of simulating FDI on GOOSE and SV protocols is developed to evaluate the impact of such attacks on power grid. IEC 62351 stipulates cybersecurity guidelines for GOOSE and SV, but only at communication or Information Technology (IT) level. Hence there is a need to develop a holistic security both at IT and Operation Technology (OT) level. In this regard, a novel sequence content resolver-based hybrid security scheme suitable to tackle FDI attacks on GOOSE and SV is proposed. Furthermore, the computational performance of the proposed hybrid se...
2019 IEEE 28th International Symposium on Industrial Electronics (ISIE), 2019
A novel configurations of a non-isolated Modified SEPIC Converter with two Voltage Lift Switched ... more A novel configurations of a non-isolated Modified SEPIC Converter with two Voltage Lift Switched Inductor (MSCVLSI) modules namely MSCVLSI-XYL, MSCVLSI-LYZ and MSCVLSI-XLZ are presented in the paper. The key features of these configurations are, 1) high voltage conversion ratio, 2) single controlled switch, 3) high-value input inductor to smooth the input current, 4) maximum utilization of input source, 5) continuous input current. With these notable features, proposed configurations are more convenient for high voltage renewable energy applications to boost the low voltage of photovoltaic array/fuel cell. The feasibility of these converter configurations are verified by mathematical analysis and simulation results. MSCVLSI configurations are simulated for 250 W resistive load and at 50 kHz switching frequency.
IEEE Transactions on Industry Applications, 2019
This paper presents the design and implementation of solarpowered V/f controlled singlephase capa... more This paper presents the design and implementation of solarpowered V/f controlled singlephase capacitorstart induction motor. Multi-Level Quasi Impedance Source Inverter (MLqZSI) controls the power flowing from PV array to singlephase induction motor. In solar powered drive systems, main concern is stable intended operation of drive when subjected to variations in power generation of PV array. For same environmental conditions, PV power extraction is different at different torques for constant speed application. Due to this, extraction of maximum power with MPPT algorithm is not achieved with only motor load. To address this concern, concept of battery storage system is introduced in the system which helps in achieving maximum power when PV power generation capability exceeds rated motor input power. In addition to this, battery storage system can supply power to the load when PV power generation is less than the rated motor input power. Conclusively, design of control algorithm must address issues of MPPT algorithm, control of battery storage system and stable operation of V/fcontrolled induction motor drive operation. MATLAB ® / Simulink model of the proposed system with 4kW PV array rating is developed. Proposed Control Algorithm achieves satisfactory operation of singlephase motor drive in all the three operation modes (depending upon PV power generation). Variation of solar irradiation and temperature are simultaneously considered for introducing perturbation in the PV power generation. Hardware results for this system are also presented which validates the effectiveness of the control algorithm for the proposed system.
IEEE Transactions on Industry Applications, 2019
DC microgrid is gaining attraction and a recent trend in distribution power generation system due... more DC microgrid is gaining attraction and a recent trend in distribution power generation system due to penetration of renewables (especially Photovoltaic (PV) or Fuel Cell (FC)). In this paper, a new Triple-Switch-Triple-Mode High Step-Up converter (TSTM-HS converter) is presented for DC microgrid applications. In the proposed converter, voltage lift technique is employed and range of duty cycle is extended by incorporating an additional switch in converter circuitry. By doing this, high voltage conversion ratio is achieved without using a transformer, coupled inductor, and multiple stages of switched capacitors. Moreover, the TSTM-HS converter operated in three modes with two types of the duty cycles to achieve low to high voltage conversion without using high duty cycle for each switch. The effects of difference in the inductance values on the regulation and operating behavior of the TSTM-HS converter are discussed. The Continuous Conduction Mode (CCM) and Discontinuous Conduction Mode (DCM) characteristics of TSTM-HS converter are discussed in detail with steady-state analysis and boundary condition. The comparison is provided to highlight the benefits of the TSTM-HS converter. The selection of semiconductor devices and the design of reactive components are discussed for the TSTM-HS converter. The experimental results of the proposed converter are provided which validate the theoretical approach, performance, and feasibility of converter.
2013 Africon, 2013
ABSTRACT Multi-phase motor drives becoming popular in some niche application areas such as ship p... more ABSTRACT Multi-phase motor drives becoming popular in some niche application areas such as ship propulsion, 'more electric aircraft' electric and hybrid electric vehicle. The rise in popularity is attributed to fact that they are robust, less noisy, reduced volume and lower per-phase power handling by the feeding converters. Adjustable speed drives invariably need power electronic converter for their supply. The most common choice is a AC/DC/AC converter. However, direct AC/AC converter is attractive option due to single stage conversion characteristics. Direct AC/AC converter or more popularly called a matrix converter has received attention recently for multiphase motor drives. Due to complexity of the power switching circuit proper modelling of matrix converter is important in devising appropriate control algorithm. This paper develops complete model of a three to five-phase matrix converter based on space vector approach. Both direct and indirect types of matrix converter model is presented. Simulation results are provided to validate the model.
2013 IEEE Frontiers in Education Conference (FIE), 2013
Engineering Ethics is an important topic to be developed in engineering education curriculum. Des... more Engineering Ethics is an important topic to be developed in engineering education curriculum. Despite its importance, ethics is not much investigated in engineering education as compared to other disciplines, in particular medicine or biology education. In this paper, a comprehensive review of engineering ethics is provided. The review covers three main topics: 1) Attributes of ethical engineers, 2) Content, logistics and pedagogy of engineering ethics, and 3) Assessment of engineering ethics. A particular focus is given to the Defining Issues Test (DIT) and the Engineering and Science Issues Test (ESIT) that is considered a promising instrument to assess moral judgment development of science and engineering students. Final remarks will conclude the paper.
Scientific Reports
IEC 61850 is emerging as a popular communication standard for smart grids. Standardized communica... more IEC 61850 is emerging as a popular communication standard for smart grids. Standardized communication in smart grids has an unwanted consequence of higher vulnerability to cyber-attacks. Attackers exploit the standardized semantics of the communication protocols to launch different types of attacks such as false data injection (FDI) attacks. Hence, there is a need to develop a cybersecurity testbed and novel mitigation strategies to study the impact of attacks and mitigate them. This paper presents a testbed and methodology to simulate FDI attacks on IEC 61850 standard compliant Generic Object-Oriented Substation Events (GOOSE) protocol using real time digital simulator (RTDS) together with open-source tools such as Snort and Wireshark. Furthermore, a novel hybrid cybersecurity solution by the name of sequence content resolver is proposed to counter such attacks on the GOOSE protocol in smart grids. Utilizing the developed testbed FDI attacks in the form of replay and masquerade att...
IEEE Access
Conventional energy sources are a major source of pollution. Major efforts are being made by glob... more Conventional energy sources are a major source of pollution. Major efforts are being made by global organizations to reduce CO 2 emissions. Research shows that by 2030, EVs can reduce CO 2 emissions by 28%. However, two major obstacles affect the widespread adoption of electric vehicles: the high cost of EVs and the lack of charging stations. This paper presents a comprehensive data-driven approach based demand-side management for a solar-powered electric vehicle charging station connected to a microgrid. The proposed approach utilizes a solar-powered electric vehicle charging station to compensate for the energy required during peak demand, which reduces the utilization of conventional energy sources and shortens the problem of fewer EVCS in the current scenario. PV power stations, commercial loads, residential loads, and electric vehicle charging stations were simulated using the collected real-time data. Furthermore, a deep learning approach was developed to control the energy supply to the microgrid and to charge the electric vehicle from the grid during off-peak hours. Furthermore, two different machine learning approaches were compared to estimate the state of charge estimation of an energy storage system. Finally, the proposed framework of the demand management system was executed for a case study of 24 hours. The results reflect that peak demand has been compensated with the help of an electric vehicle charging station during peak hours. INDEX TERMS CO 2 emission, data-driven approach, deep learning, demand-side management, electric vehicle charging station, peak clipping.
2019 IEEE International Conference on Industrial Technology (ICIT), 2019
Impedance source inverters (Z-source and Quazi-Z-source (QZS)) are the promising converter topolo... more Impedance source inverters (Z-source and Quazi-Z-source (QZS)) are the promising converter topologies in the future generation because of the buck, boost and buck-boost modes of operation. In this paper, three phase voltage sensorless grid connected QZS inverter is proposed to inject Maximum Direct Power. The new system uses the Virtual Flux Oriented Control (VFOC) algorithm for current control and virtual Flux (VF) estimation method for grid voltage. The complete Virtual Flux direct Power control (VFOC-DPC) exemplify the performance and operation of the proposed system compared to the conventional DPC algorithm is presented. Proposed strategy is also investigated under predistorted and unbalance grid conditions. VFOC-DPC provides numerous benefits mainly providing balanced sinusoidal line currents when the supply voltage is unbalanced. Simulation results are presented under unbalanced and pre-existing harmonic content in the grid voltage to verify the VF estimation of grid voltage. Tracking of active- reactive power is accurately done with current control loops providing good steady state and transient response to step change in reference.
International Transactions on Electrical Energy Systems, 2019
A matrix converter (MC) is a topology for ac-ac power conversion that has been widely investigate... more A matrix converter (MC) is a topology for ac-ac power conversion that has been widely investigated and compared with conventional ac-dc-ac topologies because of its attractive features. The MC is formed of controlled active devices and does not include any sizeable passive components. The converter can be used to directly control single/three/multiphase loads. MCs are highly effective in controlling the power factor and providing sinusoidal input and output currents. This paper provides a comprehensive state of the art review of the MC and discusses the main topology variations including single-phase conventional and isolated MCs, three-phase direct and indirect MCs, impedance source (Z-source) MCs, multiphase MCs, and multilevel MCs (MMCs). The aim of this research article is to provide a one-stop information on single/three/multiphase matrix, Z-source matrix, and multilevel MCs for potential readers, researchers, and practicing engineers.
IET Power Electronics, 2019
A novel high gain three-state switching hybrid boost (TSS-HB) converter for DC microgrid applicat... more A novel high gain three-state switching hybrid boost (TSS-HB) converter for DC microgrid applications is proposed in this study. The TSS-HB converter is developed from a conventional boost converter with voltage lift technique. The high voltage gain is achieved by the inclusion of an additional semiconductor switch. Further, this structure reduces the voltage and current stress of the switches and diodes. The proposed TSS-HB converter operates in three switching states with the help of two different duty ratios (k 1 and k 2). The power circuitry, continuous conduction mode (CCM) and discontinues conduction mode (DCM), and characteristics waveform are discussed in detail based on the theoretical background. The voltage gain and efficiency analysis of TSS-HB in CCM is presented with consideration of non-ideal circuit components. While boundary condition and voltage gain in DCM is discussed with ideal components. The comparison sections highlight the advantages of TSS-HB over existed topologies with the same number of components. Further, the selection of semiconductor devices and the design of components are discussed in detail. Finally, the hardware results are presented which validate the predicted characteristics of TSS-HB converter.
The Journal of Engineering, 2019
In this study, the performance of fault tolerant single-phase capacitor start capacitor run induc... more In this study, the performance of fault tolerant single-phase capacitor start capacitor run induction motor powered using seven-level quasi-impedance source inverter (qZSI) is analysed. The seven-level inverter consists of three units of qZSI connected in cascade. When one of the qZSI module fails (due to semiconductor failure), the resultant rms voltage applied to the motor will be reduced by one-third. This leads to reduction in both mechanical speed and electromagnetic torque of the motor. To restore the performance of the motor to pre-fault condition, the voltage deficit must be compensated. In conventional CHB inverter, it is not possible to achieve the pre-fault voltage. However, in qZSI, it is possible to achieve required voltage boost by application of shoot through duty cycle. Here, voltage of other two healthy operating modules can be boosted to reach prefault inverter output voltage during post-fault condition. The maximum voltage boost achievable is limited by the maximum shoot-through duty cycle which is related with modulation index. To verify the concept, simulation results of single-phase capacitor-start capacitor-run induction motor with or without proposed control algorithm are discussed. Experimental results for the proposed algorithm with RL load are discussed.
IEEE Access, 2019
High-gain DC/DC converters with high efficiency are needed in dc microgrid owed to the low voltag... more High-gain DC/DC converters with high efficiency are needed in dc microgrid owed to the low voltage of power sources, e.g., photovoltaic-cell and fuel-cell. This paper proposed a new high-gain double-duty-triple-mode (DDTM) converter for dc-microgrid applications. The proposed DDTM converter operates in three modes to achieve higher voltage gain without utilizing transformer, coupled inductor, voltage multiplier, and multiple voltage lifting techniques, e.g., triple, quadruple voltage lift. The modes of operation of the converter are controlled through three switches with two distinct duty ratios (double duty) to achieve wide range duty ratio. The operating principle, voltage gain analysis, and efficiency analysis of the proposed converter are discussed in detail and to show its benefits comparison is provided with the existing high-gain converters. The boundary operating condition for continuous conduction mode (CCM) and discontinuous conduction mode (DCM) is presented. The prototype of the proposed converters with 500-W power is implemented in the laboratory and experimentally investigated, which validate the performance and feasibility of the proposed converter. Due to double duty control, the proposed converter can be controlled in different ways and the thorough discussion on controlling of the converter is provided as a future scope. (min) L1 and I (min) L2 Lower peak of current through inductor L 1 and L 2 I L1 and I L2 Peak to peak current ripples of inductor L 1 , L 2 v C1 and v C2 Voltage across capacitor C 1 , C 2 V C1 and V C2 Average voltage across capacitor C 1 , C 2 v D1 and v D2 Voltage across diodes D 1 , D 2 V D1 and V D2 Average voltage across diodes D 1 , D 2 i S1 , i S2 , and i S3 Current through switches S 1 , S 2 , S 3 v S1 and v S2 Voltage across switches S 1 , S 2 v AB Voltage across AB junction (diode D + switch S 3) v 1 and v 2 Input and output voltage (average value of V 1 and V 2) R 1 Series resistance of input voltage i 1 and i 2 Input and output current I 1 and I 2 Average value of Input and output current v GS1 , v GS2 , and v GS3 Voltage magnitude of gate pulse for switches S 1 , S 2 , S 3 I, II and III (in superscript) Defines the values in Mode I, II and III χ B Boundary normalized inductor time constant χ Normalized inductor time constant
Electronics, 2019
Multiphase (more than three) power system has gained popularity due to their inherent advantages ... more Multiphase (more than three) power system has gained popularity due to their inherent advantages when compared to three-phase counterpart. Multiphase power supply is extensively used in AC/DC multi-pulse converters, especially supply with multiple of three-phases. AC/DC converter with multi-pulse input is a popular solution to reduce the ripple in the DC output. Single-phase and three-phase transformers and phase transformation from single to multiphase are employed in variable speed drives application to feed the multi-cell H-Bridge converters and multi-pulse AC-DC converters. Six-phase system is extensively discussed in the literature for numerous applications ranging from variable speed drives to multiphase wind energy generation system. This paper shows the systematic phase transformation technique from three-phase to six-phase (both symmetrical and asymmetrical) for both understanding and teaching purposes. Such an approach could help students understand a promising advanced co...
International Journal of Power Electronics and Drive Systems (IJPEDS), 2016
Multiphase electric drives have been developed due to numerous advantages offered by those machin... more Multiphase electric drives have been developed due to numerous advantages offered by those machines when it compared with the conventional three-phase machines. Multiphase motor drives are considered for applications, where the reduction of power per phase for both motor and inverter and high reliability are required. High performance control techniques are developed for multi-phase drives. The performances of the high performance controller and flux observers may be degraded during the operation. Since the parameters of Induction Motor (IM) varies continuously due to temperature variation and heating. Thus it is significantly important that the value of rotor resistance is continuously observed online and adapted by the control algorithm in order to avoid detuning effects. The efficiency and performance of an induction motor drive system can be improved by online observation of the critical parameters, such as the rotor resistance and stator resistance. Among the parameters of IM, ...
2015 16th International Conference on Sciences and Techniques of Automatic Control and Computer Engineering (STA), 2015
In this paper, a new sliding mode observer is developed for the indirect rotor flux oriented cont... more In this paper, a new sliding mode observer is developed for the indirect rotor flux oriented control (IRFOC) of a Five-phase Induction motor drive. Numerous observer structures for Five-phase induction motor drive is presented in the literature with acceptable performances. However, the objective of this work is to develop and test another family of observers based on the sliding mode approach. This structure is considered as a high gain observer which gives firstly good dynamic performance and secondly high robustness. The shortcoming of the sliding mode observer (SMO) is the chattering phenomena. It seems that the chattering problem can be reduced by replacing the signum function by saturation function in the observer structure. To grantee the closed-loop stability of the proposed observer control, stability analysis based on the Lyapunov theory is presented. Simulations results demonstrate and justify the validity of the proposed structure observer.
INTED2016 Proceedings, 2016
Uploads
Papers by Rashid Alammari