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Papers by Songsak Chusanapiputt

2004 IEEE Region 10 Conference TENCON 2004.

ABSTRACT

Proceedings. International Conference on Power System Technology

This paper presents a method for calculation of critical fault clearing time (t/sub cr/) using th... more This paper presents a method for calculation of critical fault clearing time (t/sub cr/) using the energy function method. The method for calculation is the potential energy boundary surface (PEBS) and the controlling of unstable equilibrium point (UEP). Power system stability deals with the power system's response to disturbances. The conventional transient stability studies use time domain. So that finding critical clearing time for clearing machine under fault condition is slow by the trial and error finding method. The applied time domain for transient assessment is not practical using for realtime transient stability assessment. Using the energy function is the way to make transient stability assessment possible in real-time. With this method the main point is the real critical clearing time (t/sub cr/) for desired instability.

2011 IEEE 54th International Midwest Symposium on Circuits and Systems (MWSCAS)

Optimal Power Flow (OPF) is one of the most vital tools for power system operation analysis, whic... more Optimal Power Flow (OPF) is one of the most vital tools for power system operation analysis, which requires a complex mathematical formulation to find the best solution. Conventional methods such as Linear Programming, Newton-Raphson and Non-linear Programming were previously offered to tackle the complexity of the OPF. However, with the emergence of artificial intelligence, many novel techniques such as artificial intelligence and swarm intelligence approaches have also received great attention. This paper described the use of Cultural-based Bee Colony to solve the OPF problems. The results show that solving the OPF problem by the Cultural-based Bee Colony are more effective than other swarm intelligence methods in the literature.

PowerCon 2000. 2000 International Conference on Power System Technology. Proceedings (Cat. No.00EX409)

Yunnan Province is extremely rich in hydropower resources. The Lanchang river is one of the most ... more Yunnan Province is extremely rich in hydropower resources. The Lanchang river is one of the most important rivers in Yunnan Province and would be exploited first. To maximize the benefit, cascaded hydropower projects on the Lanchang river at the middle and lower reaches would be exploited. Jinghong Hydropower Project is one of the cascaded projects to be developed and is very suitable for exporting electricity to Thailand. At present, Thailand is the single largest purchaser of electricity energy in South-East Asia. It will be necessary to build a high voltage transmission line of approximately 1100 km. The transmission line would cross territories of the three countries: PR China, Lao PDR and Thailand. One of the study results is that HVDC is more suitable than HVAC.

This paper presents a method for power swing and fault diagnosis of power system based on Support... more This paper presents a method for power swing and fault diagnosis of power system based on Support Vector Machine (SVM) classifier. The method adopts Least Square Support Vector Machine (LS-SVM) classifier to identify the power swing and fault types. The power swing blocking elements are based on monitor the rate of change of the impedance, the power swing center voltage, the positive current and zero sequence component. The process of training the LS-SVM using a K-folded cross validation process for determining the values of parameter σ and parameter λ in RBF kernel parameter that will give minimum classification error. The proposed method can successfully detect power swing and provide power swing blocking for accurate distance protection during power swing.

Optimal Power Flow (OPF) is one of the most vital tools for power system operation analysis, whic... more Optimal Power Flow (OPF) is one of the most vital tools for power system operation analysis, which requires a complex mathematical formulation to find the best solution. Conventional methods such as Linear Programming, Newton-Raphson and Non-linear Programming were previously offered to tackle the complexity of the OPF. However, with the emergence of artificial intelligence, many novel techniques such as artificial intelligence and swarm intelligence approaches have also received great attention. This paper described the use of Cultural-based Bee Colony to solve the OPF problems. The results show that solving the OPF problem by the Cultural-based Bee Colony are more effective than other swarm intelligence methods in the literature.

This paper presents a new systematic to design adaptive optimal power system stabilizer (AOPSS) b... more This paper presents a new systematic to design adaptive optimal power system stabilizer (AOPSS) based on a linear quadratic regulator. Two artificial intelligence programs are applied to design the proposed AOPSS. First, Tabu search is applied to optimize set of the weighting matrices Q and R over their wide range of operating conditions. Second, a radial basis function (RBF) neural network with orthogonal least square learning is used to adapt feedback gains, which correspond with Riccati equation. The proposed method AOPSS is illustrated with application to design of stabilizer for a single generator connected to an infinite bus under various disturbances. The eigenvalue analysis and the time domain simulation results show the effectiveness of the proposed AOPSS to improve damping characteristics and to enhance the system stability over wide range of loading conditions. Moreover, AOPSS gives better performance than conventional stabilizer and adaptive conventional stabilizer.

This paper presents the numerical analysis method of current distribution electromagnetic fields,... more This paper presents the numerical analysis method of current distribution electromagnetic fields, using grounding and soil structure analysis (CDEGS) software to interpret apparent resistances field measurement result. The steepest descent method is the function of least-square criterion which is adopted to translate and to explain the field measured result. When the ground fault occurs in any location in power system,

Ieej Transactions on Power and Energy, 2008

ABSTRACT

This paper describes the solution of minimization of transmission loss with consideration of tran... more This paper describes the solution of minimization of transmission loss with consideration of transformer taps constraint. The transformer taps are using as control variables for transmission loss minimization and maintain voltage profile when the disturbance occurs in system. When transformer taps are only used for minimization of transmission loss that has to control transformer taps close to center. Proposed methodology is to control the stages of transformer taps close to the center of transformer taps. The equation of transformer taps stages is included in the objective function and in inequality constraints. An optimal power flow problem is solved by using interior point method. The problem constraints are the power flow equation, the bound of the power system and stages of transformer taps.

Proper placement of static VAR compensator (SVC) and thyrlstor controlled series compensator (TCS... more Proper placement of static VAR compensator (SVC) and thyrlstor controlled series compensator (TCSC) reduces transmission losses, increases the available capacity, and improves the voltage profile. This paper presents an optimal placement of SVC and TCSC to determine SVC and TCSC locations and control parameters for minimization of transmission loss. Optimal location method utilizes the sensitivity of total real power transmission

Generally, resistances and susceptance of transmission lines are neglected in determining voltage... more Generally, resistances and susceptance of transmission lines are neglected in determining voltage stability limit. Differently, this paper includes such parameters to form the P-Q curve analyzed as a rotated parabola. In the region inside the line P-Q curve, a power system can operate normally, but in the outside the system operation is impossible. The line voltage collapse coefficient is determined

This paper presents a new method to solve the constrained unit commitment problem by applying ant... more This paper presents a new method to solve the constrained unit commitment problem by applying ant colony optimization (ACO) based on the diversity control approach. The pheromone updating rule is modified to control the diversification by adopting a simple mechanism for random selection in ACO. The proposed method is tested on the 10-unit test system with a scheduling time horizon of 24 hours. The numerical results show an economical saving in the total operating cost when compared to the previous literature results. Moreover, two types of the proposed diversity control technique have the features of easy implementation and a better convergence rate superior to a standard ACO.

This paper presents a method for calculation of critical fault clearing time (tcr) using the ener... more This paper presents a method for calculation of critical fault clearing time (tcr) using the energy function method. The method for calculation is the potential energy boundary surface (PEBS) and the controlling of unstable equilibrium point (UEP). Power system stability deals with the power system's response to disturbances. The conventional transient stability studies use time domain. So that finding critical clearing time for clearing machine under fault condition is slow by the trial and error finding method. The applied time domain for transient assessment is not practical using for realtime transient stability assessment. Using the energy function is the way to make transient stability assessment possible in real-time. With this method the main point is the real critical clearing time (tcr) for desired instability.

This paper presents a development of improved Tabu search (ITS) and its application to a least-co... more This paper presents a development of improved Tabu search (ITS) and its application to a least-cost generation expansion planning (GEP) including biomass energy sources under global environmental impact consideration. A carbon tax is taken into account as counter measure to reduce CO2 emission for introducing and promoting biomass energies to GEP problem based conventional fossil-fuel plants. The proposed ITS is conducted by the proposed a self-reforming candidate list strategies to improve search performance of a standard TS. The ITS approach is applied to the test system with 15 existing power plants, 5 types of conventional fossil-fuel and 2 types of biomass energy over a 14-year planning period. The simulation results reveal that the proposed ITS not only can yield optimal solution as well as dynamic programming, but also can remarkably reduce computational time. Moreover, the proposed method provides better solution superior to a standard Tabu search with promising results.

This paper proposes an analysis and prediction of stator windings temperature for a 1 hp, 380 V, ... more This paper proposes an analysis and prediction of stator windings temperature for a 1 hp, 380 V, 50 Hz, 4-pole, three-phase induction motor fed by PWM inverter. The inverter produces nonsinusoidal source at fundamental frequency of 50 Hz while the switching frequencies of the inverter are 1 kHz, 5 kHz, and 10 kHz. The experimental results are compared with those

2004 IEEE Region 10 Conference TENCON 2004.

ABSTRACT

Proceedings. International Conference on Power System Technology

This paper presents a method for calculation of critical fault clearing time (t/sub cr/) using th... more This paper presents a method for calculation of critical fault clearing time (t/sub cr/) using the energy function method. The method for calculation is the potential energy boundary surface (PEBS) and the controlling of unstable equilibrium point (UEP). Power system stability deals with the power system's response to disturbances. The conventional transient stability studies use time domain. So that finding critical clearing time for clearing machine under fault condition is slow by the trial and error finding method. The applied time domain for transient assessment is not practical using for realtime transient stability assessment. Using the energy function is the way to make transient stability assessment possible in real-time. With this method the main point is the real critical clearing time (t/sub cr/) for desired instability.

2011 IEEE 54th International Midwest Symposium on Circuits and Systems (MWSCAS)

Optimal Power Flow (OPF) is one of the most vital tools for power system operation analysis, whic... more Optimal Power Flow (OPF) is one of the most vital tools for power system operation analysis, which requires a complex mathematical formulation to find the best solution. Conventional methods such as Linear Programming, Newton-Raphson and Non-linear Programming were previously offered to tackle the complexity of the OPF. However, with the emergence of artificial intelligence, many novel techniques such as artificial intelligence and swarm intelligence approaches have also received great attention. This paper described the use of Cultural-based Bee Colony to solve the OPF problems. The results show that solving the OPF problem by the Cultural-based Bee Colony are more effective than other swarm intelligence methods in the literature.

PowerCon 2000. 2000 International Conference on Power System Technology. Proceedings (Cat. No.00EX409)

Yunnan Province is extremely rich in hydropower resources. The Lanchang river is one of the most ... more Yunnan Province is extremely rich in hydropower resources. The Lanchang river is one of the most important rivers in Yunnan Province and would be exploited first. To maximize the benefit, cascaded hydropower projects on the Lanchang river at the middle and lower reaches would be exploited. Jinghong Hydropower Project is one of the cascaded projects to be developed and is very suitable for exporting electricity to Thailand. At present, Thailand is the single largest purchaser of electricity energy in South-East Asia. It will be necessary to build a high voltage transmission line of approximately 1100 km. The transmission line would cross territories of the three countries: PR China, Lao PDR and Thailand. One of the study results is that HVDC is more suitable than HVAC.

This paper presents a method for power swing and fault diagnosis of power system based on Support... more This paper presents a method for power swing and fault diagnosis of power system based on Support Vector Machine (SVM) classifier. The method adopts Least Square Support Vector Machine (LS-SVM) classifier to identify the power swing and fault types. The power swing blocking elements are based on monitor the rate of change of the impedance, the power swing center voltage, the positive current and zero sequence component. The process of training the LS-SVM using a K-folded cross validation process for determining the values of parameter σ and parameter λ in RBF kernel parameter that will give minimum classification error. The proposed method can successfully detect power swing and provide power swing blocking for accurate distance protection during power swing.

Optimal Power Flow (OPF) is one of the most vital tools for power system operation analysis, whic... more Optimal Power Flow (OPF) is one of the most vital tools for power system operation analysis, which requires a complex mathematical formulation to find the best solution. Conventional methods such as Linear Programming, Newton-Raphson and Non-linear Programming were previously offered to tackle the complexity of the OPF. However, with the emergence of artificial intelligence, many novel techniques such as artificial intelligence and swarm intelligence approaches have also received great attention. This paper described the use of Cultural-based Bee Colony to solve the OPF problems. The results show that solving the OPF problem by the Cultural-based Bee Colony are more effective than other swarm intelligence methods in the literature.

This paper presents a new systematic to design adaptive optimal power system stabilizer (AOPSS) b... more This paper presents a new systematic to design adaptive optimal power system stabilizer (AOPSS) based on a linear quadratic regulator. Two artificial intelligence programs are applied to design the proposed AOPSS. First, Tabu search is applied to optimize set of the weighting matrices Q and R over their wide range of operating conditions. Second, a radial basis function (RBF) neural network with orthogonal least square learning is used to adapt feedback gains, which correspond with Riccati equation. The proposed method AOPSS is illustrated with application to design of stabilizer for a single generator connected to an infinite bus under various disturbances. The eigenvalue analysis and the time domain simulation results show the effectiveness of the proposed AOPSS to improve damping characteristics and to enhance the system stability over wide range of loading conditions. Moreover, AOPSS gives better performance than conventional stabilizer and adaptive conventional stabilizer.

This paper presents the numerical analysis method of current distribution electromagnetic fields,... more This paper presents the numerical analysis method of current distribution electromagnetic fields, using grounding and soil structure analysis (CDEGS) software to interpret apparent resistances field measurement result. The steepest descent method is the function of least-square criterion which is adopted to translate and to explain the field measured result. When the ground fault occurs in any location in power system,

Ieej Transactions on Power and Energy, 2008

ABSTRACT

This paper describes the solution of minimization of transmission loss with consideration of tran... more This paper describes the solution of minimization of transmission loss with consideration of transformer taps constraint. The transformer taps are using as control variables for transmission loss minimization and maintain voltage profile when the disturbance occurs in system. When transformer taps are only used for minimization of transmission loss that has to control transformer taps close to center. Proposed methodology is to control the stages of transformer taps close to the center of transformer taps. The equation of transformer taps stages is included in the objective function and in inequality constraints. An optimal power flow problem is solved by using interior point method. The problem constraints are the power flow equation, the bound of the power system and stages of transformer taps.

Proper placement of static VAR compensator (SVC) and thyrlstor controlled series compensator (TCS... more Proper placement of static VAR compensator (SVC) and thyrlstor controlled series compensator (TCSC) reduces transmission losses, increases the available capacity, and improves the voltage profile. This paper presents an optimal placement of SVC and TCSC to determine SVC and TCSC locations and control parameters for minimization of transmission loss. Optimal location method utilizes the sensitivity of total real power transmission

Generally, resistances and susceptance of transmission lines are neglected in determining voltage... more Generally, resistances and susceptance of transmission lines are neglected in determining voltage stability limit. Differently, this paper includes such parameters to form the P-Q curve analyzed as a rotated parabola. In the region inside the line P-Q curve, a power system can operate normally, but in the outside the system operation is impossible. The line voltage collapse coefficient is determined

This paper presents a new method to solve the constrained unit commitment problem by applying ant... more This paper presents a new method to solve the constrained unit commitment problem by applying ant colony optimization (ACO) based on the diversity control approach. The pheromone updating rule is modified to control the diversification by adopting a simple mechanism for random selection in ACO. The proposed method is tested on the 10-unit test system with a scheduling time horizon of 24 hours. The numerical results show an economical saving in the total operating cost when compared to the previous literature results. Moreover, two types of the proposed diversity control technique have the features of easy implementation and a better convergence rate superior to a standard ACO.

This paper presents a method for calculation of critical fault clearing time (tcr) using the ener... more This paper presents a method for calculation of critical fault clearing time (tcr) using the energy function method. The method for calculation is the potential energy boundary surface (PEBS) and the controlling of unstable equilibrium point (UEP). Power system stability deals with the power system's response to disturbances. The conventional transient stability studies use time domain. So that finding critical clearing time for clearing machine under fault condition is slow by the trial and error finding method. The applied time domain for transient assessment is not practical using for realtime transient stability assessment. Using the energy function is the way to make transient stability assessment possible in real-time. With this method the main point is the real critical clearing time (tcr) for desired instability.

This paper presents a development of improved Tabu search (ITS) and its application to a least-co... more This paper presents a development of improved Tabu search (ITS) and its application to a least-cost generation expansion planning (GEP) including biomass energy sources under global environmental impact consideration. A carbon tax is taken into account as counter measure to reduce CO2 emission for introducing and promoting biomass energies to GEP problem based conventional fossil-fuel plants. The proposed ITS is conducted by the proposed a self-reforming candidate list strategies to improve search performance of a standard TS. The ITS approach is applied to the test system with 15 existing power plants, 5 types of conventional fossil-fuel and 2 types of biomass energy over a 14-year planning period. The simulation results reveal that the proposed ITS not only can yield optimal solution as well as dynamic programming, but also can remarkably reduce computational time. Moreover, the proposed method provides better solution superior to a standard Tabu search with promising results.

This paper proposes an analysis and prediction of stator windings temperature for a 1 hp, 380 V, ... more This paper proposes an analysis and prediction of stator windings temperature for a 1 hp, 380 V, 50 Hz, 4-pole, three-phase induction motor fed by PWM inverter. The inverter produces nonsinusoidal source at fundamental frequency of 50 Hz while the switching frequencies of the inverter are 1 kHz, 5 kHz, and 10 kHz. The experimental results are compared with those