Samir Alhejaj - Academia.edu (original) (raw)

Papers by Samir Alhejaj

Research paper thumbnail of Inertial frequency response provided by battery energy storage systems: Probabilistic assessment

2017 6th International Conference on Clean Electrical Power (ICCEP), 2017

This paper proposes a methodology for assessment to measure the impact of the inertial frequency ... more This paper proposes a methodology for assessment to measure the impact of the inertial frequency response provided by battery energy storage systems (BESS) considering power system uncertainties. The proposed methodology is used to assess the impact of the BESS equipped with sensible frequency controller on the frequency behaviour of the system after a system frequency disturbance considering the variability coming from power system uncertainties. The proposed meteorology is tested in an illustrative power system considering the integration of a grid-scale BESS equipped with inertial frequency response controller, the uncertainty of the power system is simulated by the variability of the power demand. Monte Carlo simulations and time-domain simulations, using DIgSILENT ® PowerFactory TM are combined in the implementation of the proposed methodology. Simulation results demonstrate the suitability of the proposed approach to obtain probabilistic distribution functions (PDF) of the main system frequency response.

Research paper thumbnail of Probabilistic Load-Flow Using Analysis Using DPL Scripting Language

Load-flow analysis is an effective tool that is commonly used to capture the power system operati... more Load-flow analysis is an effective tool that is commonly used to capture the power system operational performance and its state at a certain point in time. Power grid operators use load-flow extensively on a daily basis to plan for day-ahead and dispatch scheduling among many other purposes. Also, it used to plan any grid expansion, alter or modernization. However, due to the deterministic nature and its applicability for only one set of operational data at a certain period, deterministic load-flow reduces the chances for predicting the uncertainty in power system. Researchers usually create a data model using probabilistic analyses techniques to produce a stochastic model that mimics the realistic system data. Combining this model with Monte Carlo methodology leads to form a probabilistic load-flow tool that is more powerful and potent to carry on many uncertainty tasks and other aspects of power system assessment. This chapter presents the DIgSILENT PowerFactory script language (D...

Research paper thumbnail of Impact of inertia emulation control of grid-scale BESS on power system frequency response

2016 International Conference for Students on Applied Engineering (ISCAE), 2016

Battery Energy Storage System (BESS) becomes important for many applications, including frequency... more Battery Energy Storage System (BESS) becomes important for many applications, including frequency regulation and control. This paper presents a comprehensive analysis of all the electro-mechanical-chemical variables involved in improving the system frequency response. It also evaluates the impact of including inertial emulation control of grid-scale BESS on the system frequency response of classical transmission systems. In order to investigate this impact, several simulations case studies are carried out, with different sudden generation outages and load disturbances with different power supply capacities. All case studies are combined with time-domain events to inspect the dynamic behavior of the frequency response of grid-scale battery. The purpose of this paper is to investigate the inertial response to design a set of algorithms to control the output of the inertial controller.

Research paper thumbnail of Enabling inertial response in utility-scale battery energy storage system

2016 IEEE Innovative Smart Grid Technologies - Asia (ISGT-Asia), 2016

This paper presents a simple controller to enable the inertial response of utility-scale battery ... more This paper presents a simple controller to enable the inertial response of utility-scale battery energy storage system (BESS). Details of the BESS modeling are presented in this paper. The main contribution of this paper is to demonstrate that inertial controller in BESS help to reduce change to the rate of change of frequency (RoCoF), providing frequency support and improving the system frequency response. The effect of changes in the gain of the synthetic inertial on the system frequency response is investigated using time domain simulations based on DIgSILENT PowerFactory. The time-domain simulations show the advantages of using the inertial controller in BESS to reduce the initial drop in the system frequency. The battery charge control must be improved in order to avoid undesirable battery recharge during critical stages of the frequency response. This is especially dangerous because it can create a second system

Research paper thumbnail of Investigation on grid-scale BESS providing inertial response support

2016 IEEE International Conference on Power System Technology (POWERCON), 2016

The importance of Energy Storages System (ESS) without a doubt is started to compete for the impo... more The importance of Energy Storages System (ESS) without a doubt is started to compete for the importance of Renewable Energy System (RES) nowadays and in the near future. ESS such as grid-scale batteries has the advantage of storing energy and provides many other services and functionalities to the power system. This paper investigates the effect of installing Battery Energy Storage System (BESS) on grid level transmission system to support fast Inertial Frequency Response (IR). Details of the BESS modeling are presented in this paper. The main contribution is to demonstrate that inertial response provided by BESS can create change to the Rate of Change of Frequency (ROCOF), providing frequency support and improving the system frequency response. A simple test system is used to investigate the effect of the inertial controller in BESS to support the system frequency response. Many time domain simulation tests using DIgSILENT PowerFactory are carried out to evaluate the effect of installing BESS with inertial response enabled. The time-domain simulations are conducted to demonstrate the system frequency responses considering: (i) gain of the inertial controller (ii) different sizes of disturbances, (iii) system robustness.

Research paper thumbnail of A two frame feedback linearization scheme for the control of fully rated wind generating units

2017 IEEE Manchester PowerTech, 2017

The present paper proposes an innovative control scheme for a fully rated wind generating unit eq... more The present paper proposes an innovative control scheme for a fully rated wind generating unit equipped with a permanent magnet synchronous generator. The main objective of this control strategy is that of allowing a decoupled and dynamically performing control of active power (by the MPPT curve) and reactive power at the point of interconnection to the grid. Moreover, the control will be able to integrate frequency supporting logics, such as synthetic inertial control and active power curtailment. The control synthesis is fully detailed and validated by means of dedicated simulations in comparison with the traditional control scheme for this type of wind generators.

Research paper thumbnail of Inertial frequency response provided by battery energy storage systems: Probabilistic assessment

2017 6th International Conference on Clean Electrical Power (ICCEP), 2017

This paper proposes a methodology for assessment to measure the impact of the inertial frequency ... more This paper proposes a methodology for assessment to measure the impact of the inertial frequency response provided by battery energy storage systems (BESS) considering power system uncertainties. The proposed methodology is used to assess the impact of the BESS equipped with sensible frequency controller on the frequency behaviour of the system after a system frequency disturbance considering the variability coming from power system uncertainties. The proposed meteorology is tested in an illustrative power system considering the integration of a grid-scale BESS equipped with inertial frequency response controller, the uncertainty of the power system is simulated by the variability of the power demand. Monte Carlo simulations and time-domain simulations, using DIgSILENT ® PowerFactory TM are combined in the implementation of the proposed methodology. Simulation results demonstrate the suitability of the proposed approach to obtain probabilistic distribution functions (PDF) of the main system frequency response.

Research paper thumbnail of Probabilistic Load-Flow Using Analysis Using DPL Scripting Language

Load-flow analysis is an effective tool that is commonly used to capture the power system operati... more Load-flow analysis is an effective tool that is commonly used to capture the power system operational performance and its state at a certain point in time. Power grid operators use load-flow extensively on a daily basis to plan for day-ahead and dispatch scheduling among many other purposes. Also, it used to plan any grid expansion, alter or modernization. However, due to the deterministic nature and its applicability for only one set of operational data at a certain period, deterministic load-flow reduces the chances for predicting the uncertainty in power system. Researchers usually create a data model using probabilistic analyses techniques to produce a stochastic model that mimics the realistic system data. Combining this model with Monte Carlo methodology leads to form a probabilistic load-flow tool that is more powerful and potent to carry on many uncertainty tasks and other aspects of power system assessment. This chapter presents the DIgSILENT PowerFactory script language (D...

Research paper thumbnail of Impact of inertia emulation control of grid-scale BESS on power system frequency response

2016 International Conference for Students on Applied Engineering (ISCAE), 2016

Battery Energy Storage System (BESS) becomes important for many applications, including frequency... more Battery Energy Storage System (BESS) becomes important for many applications, including frequency regulation and control. This paper presents a comprehensive analysis of all the electro-mechanical-chemical variables involved in improving the system frequency response. It also evaluates the impact of including inertial emulation control of grid-scale BESS on the system frequency response of classical transmission systems. In order to investigate this impact, several simulations case studies are carried out, with different sudden generation outages and load disturbances with different power supply capacities. All case studies are combined with time-domain events to inspect the dynamic behavior of the frequency response of grid-scale battery. The purpose of this paper is to investigate the inertial response to design a set of algorithms to control the output of the inertial controller.

Research paper thumbnail of Enabling inertial response in utility-scale battery energy storage system

2016 IEEE Innovative Smart Grid Technologies - Asia (ISGT-Asia), 2016

This paper presents a simple controller to enable the inertial response of utility-scale battery ... more This paper presents a simple controller to enable the inertial response of utility-scale battery energy storage system (BESS). Details of the BESS modeling are presented in this paper. The main contribution of this paper is to demonstrate that inertial controller in BESS help to reduce change to the rate of change of frequency (RoCoF), providing frequency support and improving the system frequency response. The effect of changes in the gain of the synthetic inertial on the system frequency response is investigated using time domain simulations based on DIgSILENT PowerFactory. The time-domain simulations show the advantages of using the inertial controller in BESS to reduce the initial drop in the system frequency. The battery charge control must be improved in order to avoid undesirable battery recharge during critical stages of the frequency response. This is especially dangerous because it can create a second system

Research paper thumbnail of Investigation on grid-scale BESS providing inertial response support

2016 IEEE International Conference on Power System Technology (POWERCON), 2016

The importance of Energy Storages System (ESS) without a doubt is started to compete for the impo... more The importance of Energy Storages System (ESS) without a doubt is started to compete for the importance of Renewable Energy System (RES) nowadays and in the near future. ESS such as grid-scale batteries has the advantage of storing energy and provides many other services and functionalities to the power system. This paper investigates the effect of installing Battery Energy Storage System (BESS) on grid level transmission system to support fast Inertial Frequency Response (IR). Details of the BESS modeling are presented in this paper. The main contribution is to demonstrate that inertial response provided by BESS can create change to the Rate of Change of Frequency (ROCOF), providing frequency support and improving the system frequency response. A simple test system is used to investigate the effect of the inertial controller in BESS to support the system frequency response. Many time domain simulation tests using DIgSILENT PowerFactory are carried out to evaluate the effect of installing BESS with inertial response enabled. The time-domain simulations are conducted to demonstrate the system frequency responses considering: (i) gain of the inertial controller (ii) different sizes of disturbances, (iii) system robustness.

Research paper thumbnail of A two frame feedback linearization scheme for the control of fully rated wind generating units

2017 IEEE Manchester PowerTech, 2017

The present paper proposes an innovative control scheme for a fully rated wind generating unit eq... more The present paper proposes an innovative control scheme for a fully rated wind generating unit equipped with a permanent magnet synchronous generator. The main objective of this control strategy is that of allowing a decoupled and dynamically performing control of active power (by the MPPT curve) and reactive power at the point of interconnection to the grid. Moreover, the control will be able to integrate frequency supporting logics, such as synthetic inertial control and active power curtailment. The control synthesis is fully detailed and validated by means of dedicated simulations in comparison with the traditional control scheme for this type of wind generators.