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Papers by Mohammad reza ansari

Research paper thumbnail of AC Optimal Power Flow Problem Considering Wind Energy by an Improved Particle Swarm Optimization

Majlesi Journal of Electrical Engineering, 2020

Research paper thumbnail of Renewable Generation and Transmission Expansion Planning Coordination with Energy Storage System: A Flexibility Point of View

Applied Sciences, 2021

This paper presents a method for coordinated network expansion planning (CNEP) in which the diffe... more This paper presents a method for coordinated network expansion planning (CNEP) in which the difference between the total cost and the flexibility benefit is minimized. In the proposed method, the generation expansion planning (GEP) of wind farms is coordinated with the transmission expansion planning (TEP) problem by using energy storage systems (ESSs) to improve network flexibility. To consider the impact of the reactive power in the CNEP problem, the AC power flow model is used. The CNEP constraints include the AC power flow equations, planning constraints of the different equipment, and the system operating limits. Therefore, this model imposes hard nonlinearity onto the problem, which is linearized by the use of first-order Taylor’s series and the big-M method as well as the linearization of the circular plane. The uncertainty of loads, the energy price, and the wind farm generation are modeled by scenario-based stochastic programming (SBSP). To determine the effectiveness of th...

Research paper thumbnail of Stochastic security‐constrained hydrothermal unit commitment considering uncertainty of load forecast, inflows to reservoirs and unavailability of units by a new hybrid decomposition strategy

IET Generation, Transmission & Distribution, 2014

This study presents a new stochastic security-constrained hydrothermal unit commitment (SSCHTUC) ... more This study presents a new stochastic security-constrained hydrothermal unit commitment (SSCHTUC) model considering the uncertainty of load forecast, prediction of inflows to hydro reservoirs and unavailability of units. In addition, the proposed SSCHTUC includes AC network modelling. To cope with the large-scale and mixed-integer non-linear nature of the model, a new hybrid decomposition strategy composed of generalised Benders decomposition and outer approximation/ equality relaxation (OA/ER) is proposed. In addition, to handle the uncertainty sources, a combination of scenario approach and two-stage stochastic programming is suggested. The proposed SSCHTUC model and decomposition strategy are tested on the IEEE 9-bus and 118-bus test systems. Obtained results illustrate the effectiveness of the developed approach.

Research paper thumbnail of Small disturbance voltage stability assessment of power systems by modal analysis and dynamic simulation

Energy Conversion and Management, 2008

The introduction of liberalized electricity markets in many countries has resulted in more highly... more The introduction of liberalized electricity markets in many countries has resulted in more highly stressed power systems. On the other hand, operating points of a power system are acceptable in the feasible region, which is surrounded by the borders of different stabilities. Power system instability is critical for all participants of the electricity market. Determination of different stability margins can result in the optimum utilization of power system with minimum risk. This paper focuses on the small disturbance voltage stability, which is an important subset of the power system global stability. This kind of voltage stability is usually evaluated by static analysis tools such as continuation power flow, while it essentially has dynamic nature. Besides, a combination of linear and nonlinear analysis tools is required to correctly analyze it. In this paper, a hybrid evaluation method composed of static, dynamic, linear, and nonlinear analysis tools is proposed for this purpose. Effect of load scenario, generation pattern, branch and generator contingency on the small disturbance voltage stability are evaluated by the hybrid method. The test results are given for New England and IEEE68 bus test systems.

Research paper thumbnail of Hydrothermal unit commitment with AC constraints by a new solution method based on benders decomposition

Energy Conversion and Management, 2013

ABSTRACT This paper presents a new approach based on Benders decomposition (BD) to solve hydrothe... more ABSTRACT This paper presents a new approach based on Benders decomposition (BD) to solve hydrothermal unit commitment problem with AC power flow and security constraints. The proposed method decomposes the problem into a master problem and two sets of sub-problems. The master problem applies integer programming method to solve unit commitment (UC) while the sub-problems apply nonlinear programming solution method to determine economic dispatch for each time period. If one sub-problem of the first set becomes infeasible, the corresponding sub-problem of the second set is called. Moreover, strong Benders cuts are proposed that reduce the number of iterations and CPU time of the Benders decomposition method. All constraints of the hydrothermal unit commitment problem can be completely satisfied with zero penalty terms by the proposed solution method. The methodology is tested on the 9-bus and IEEE 118-bus test systems. The obtained results confirm the validity of the developed approach.

Research paper thumbnail of Security-constrained Unit Commitment Considering Hydro Units and AC Network Modeling by a New Hybrid Solution Method Composed of Benders Decomposition and Outer Approximation

Electric Power Components and Systems, 2012

ABSTRACT This article presents a new hybrid solution approach based on Benders decomposition and ... more ABSTRACT This article presents a new hybrid solution approach based on Benders decomposition and outer approximation to solve the security-constrained unit commitment problem. The security-constrained unit commitment model includes both thermal and hydro unit commitment as well as AC network modeling. The proposed solution method decomposes the security-constrained unit commitment formulation into a master problem and sub-problem. The master problem includes a mixed-integer linear model of unit commitment, while the sub-problem contains a non-linear formulation for security-constrained economic dispatch of each time interval. The master problem accumulates linearizations (outer approximations) and Benders cuts obtained from the solution of the sub-problem. The proposed method can efficiently solve the security-constrained unit commitment problem with a low computation burden, completely satisfying diverse constraints of the problem with zero penalty terms. The proposed hybrid solution approach is tested on the well-known 9-bus and IEEE 118-bus test systems and compared with some other recently published solution methods. These comparisons confirm the validity of the developed approach.

Research paper thumbnail of AC Optimal Power Flow Problem Considering Wind Energy by an Improved Particle Swarm Optimization

Majlesi Journal of Electrical Engineering, 2020

Research paper thumbnail of Renewable Generation and Transmission Expansion Planning Coordination with Energy Storage System: A Flexibility Point of View

Applied Sciences, 2021

This paper presents a method for coordinated network expansion planning (CNEP) in which the diffe... more This paper presents a method for coordinated network expansion planning (CNEP) in which the difference between the total cost and the flexibility benefit is minimized. In the proposed method, the generation expansion planning (GEP) of wind farms is coordinated with the transmission expansion planning (TEP) problem by using energy storage systems (ESSs) to improve network flexibility. To consider the impact of the reactive power in the CNEP problem, the AC power flow model is used. The CNEP constraints include the AC power flow equations, planning constraints of the different equipment, and the system operating limits. Therefore, this model imposes hard nonlinearity onto the problem, which is linearized by the use of first-order Taylor’s series and the big-M method as well as the linearization of the circular plane. The uncertainty of loads, the energy price, and the wind farm generation are modeled by scenario-based stochastic programming (SBSP). To determine the effectiveness of th...

Research paper thumbnail of Stochastic security‐constrained hydrothermal unit commitment considering uncertainty of load forecast, inflows to reservoirs and unavailability of units by a new hybrid decomposition strategy

IET Generation, Transmission & Distribution, 2014

This study presents a new stochastic security-constrained hydrothermal unit commitment (SSCHTUC) ... more This study presents a new stochastic security-constrained hydrothermal unit commitment (SSCHTUC) model considering the uncertainty of load forecast, prediction of inflows to hydro reservoirs and unavailability of units. In addition, the proposed SSCHTUC includes AC network modelling. To cope with the large-scale and mixed-integer non-linear nature of the model, a new hybrid decomposition strategy composed of generalised Benders decomposition and outer approximation/ equality relaxation (OA/ER) is proposed. In addition, to handle the uncertainty sources, a combination of scenario approach and two-stage stochastic programming is suggested. The proposed SSCHTUC model and decomposition strategy are tested on the IEEE 9-bus and 118-bus test systems. Obtained results illustrate the effectiveness of the developed approach.

Research paper thumbnail of Small disturbance voltage stability assessment of power systems by modal analysis and dynamic simulation

Energy Conversion and Management, 2008

The introduction of liberalized electricity markets in many countries has resulted in more highly... more The introduction of liberalized electricity markets in many countries has resulted in more highly stressed power systems. On the other hand, operating points of a power system are acceptable in the feasible region, which is surrounded by the borders of different stabilities. Power system instability is critical for all participants of the electricity market. Determination of different stability margins can result in the optimum utilization of power system with minimum risk. This paper focuses on the small disturbance voltage stability, which is an important subset of the power system global stability. This kind of voltage stability is usually evaluated by static analysis tools such as continuation power flow, while it essentially has dynamic nature. Besides, a combination of linear and nonlinear analysis tools is required to correctly analyze it. In this paper, a hybrid evaluation method composed of static, dynamic, linear, and nonlinear analysis tools is proposed for this purpose. Effect of load scenario, generation pattern, branch and generator contingency on the small disturbance voltage stability are evaluated by the hybrid method. The test results are given for New England and IEEE68 bus test systems.

Research paper thumbnail of Hydrothermal unit commitment with AC constraints by a new solution method based on benders decomposition

Energy Conversion and Management, 2013

ABSTRACT This paper presents a new approach based on Benders decomposition (BD) to solve hydrothe... more ABSTRACT This paper presents a new approach based on Benders decomposition (BD) to solve hydrothermal unit commitment problem with AC power flow and security constraints. The proposed method decomposes the problem into a master problem and two sets of sub-problems. The master problem applies integer programming method to solve unit commitment (UC) while the sub-problems apply nonlinear programming solution method to determine economic dispatch for each time period. If one sub-problem of the first set becomes infeasible, the corresponding sub-problem of the second set is called. Moreover, strong Benders cuts are proposed that reduce the number of iterations and CPU time of the Benders decomposition method. All constraints of the hydrothermal unit commitment problem can be completely satisfied with zero penalty terms by the proposed solution method. The methodology is tested on the 9-bus and IEEE 118-bus test systems. The obtained results confirm the validity of the developed approach.

Research paper thumbnail of Security-constrained Unit Commitment Considering Hydro Units and AC Network Modeling by a New Hybrid Solution Method Composed of Benders Decomposition and Outer Approximation

Electric Power Components and Systems, 2012

ABSTRACT This article presents a new hybrid solution approach based on Benders decomposition and ... more ABSTRACT This article presents a new hybrid solution approach based on Benders decomposition and outer approximation to solve the security-constrained unit commitment problem. The security-constrained unit commitment model includes both thermal and hydro unit commitment as well as AC network modeling. The proposed solution method decomposes the security-constrained unit commitment formulation into a master problem and sub-problem. The master problem includes a mixed-integer linear model of unit commitment, while the sub-problem contains a non-linear formulation for security-constrained economic dispatch of each time interval. The master problem accumulates linearizations (outer approximations) and Benders cuts obtained from the solution of the sub-problem. The proposed method can efficiently solve the security-constrained unit commitment problem with a low computation burden, completely satisfying diverse constraints of the problem with zero penalty terms. The proposed hybrid solution approach is tested on the well-known 9-bus and IEEE 118-bus test systems and compared with some other recently published solution methods. These comparisons confirm the validity of the developed approach.