Pub Date : 2014-06-10DOI: 10.1109/CTPP.2014.7040694
S. Pazouki, M. Haghifam
Gas and electricity infrastructures are independently utilized nowadays. Smart grid technologies enable integration of different energy networks such as gas, heat and electricity energy infrastructures. Combined Heat and Power (CHP) is an important sample of the technologies with significant benefits regarding reliability enhancement, economic improvement, loss reduction, and emission lower. Furthermore, integration of the technologies to electric distribution network prevents huge investment costs from power plant establishment and transmission line expansion in order to supply growing energy demands. In this paper, coupled and dependent electricity and gas infrastructures are optimally operated according to economic, technical and environmental effects on an electric distribution network bus. Energy Hub (EH) concept is used to model the presented approach in this paper. GAMS software is employed to solve the problem. Simulation results compare aforementioned terms by considering utilization of coupled and dependent electricity and gas energy networks.
{"title":"Comparison between effect of coupled and independent electricity and gas infrastructures on electric power networks","authors":"S. Pazouki, M. Haghifam","doi":"10.1109/CTPP.2014.7040694","DOIUrl":"https://doi.org/10.1109/CTPP.2014.7040694","url":null,"abstract":"Gas and electricity infrastructures are independently utilized nowadays. Smart grid technologies enable integration of different energy networks such as gas, heat and electricity energy infrastructures. Combined Heat and Power (CHP) is an important sample of the technologies with significant benefits regarding reliability enhancement, economic improvement, loss reduction, and emission lower. Furthermore, integration of the technologies to electric distribution network prevents huge investment costs from power plant establishment and transmission line expansion in order to supply growing energy demands. In this paper, coupled and dependent electricity and gas infrastructures are optimally operated according to economic, technical and environmental effects on an electric distribution network bus. Energy Hub (EH) concept is used to model the presented approach in this paper. GAMS software is employed to solve the problem. Simulation results compare aforementioned terms by considering utilization of coupled and dependent electricity and gas energy networks.","PeriodicalId":226320,"journal":{"name":"2014 5th Conference on Thermal Power Plants (CTPP)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2014-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125055521","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2014-06-10DOI: 10.1109/CTPP.2014.7040710
H. Yazdani
Pipe equipment widely are used in power plants. Many studies have been devoted to lifetime assessmentof pipeusing different approaches. In the present paper pipe under internal pressure and cyclic bending is studied (bending may be induced by heat). Chaboche's kinematic hardening model is used to simulate tube response in plastic zone. At the plastic zone microscopic defects in the material are developed into macroscopic defects and tube this leads to pipe fracture. This phenomenais simulated with continuum damage mechanics. Evolution of whole-life ratcheting behavior and fatigue damage of pipe are discussed.
{"title":"Lifetime assessment and ratcheting behavior of pressurized pipe","authors":"H. Yazdani","doi":"10.1109/CTPP.2014.7040710","DOIUrl":"https://doi.org/10.1109/CTPP.2014.7040710","url":null,"abstract":"Pipe equipment widely are used in power plants. Many studies have been devoted to lifetime assessmentof pipeusing different approaches. In the present paper pipe under internal pressure and cyclic bending is studied (bending may be induced by heat). Chaboche's kinematic hardening model is used to simulate tube response in plastic zone. At the plastic zone microscopic defects in the material are developed into macroscopic defects and tube this leads to pipe fracture. This phenomenais simulated with continuum damage mechanics. Evolution of whole-life ratcheting behavior and fatigue damage of pipe are discussed.","PeriodicalId":226320,"journal":{"name":"2014 5th Conference on Thermal Power Plants (CTPP)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2014-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125140228","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2014-06-10DOI: 10.1109/CTPP.2014.7040704
H. afkar, A. Vahedi
Power transformer is the most important and most expensive part of electric power transmission and distribution networks. Among different faults identifying in transformers, identifying winding fault is not easily recognizable because of lower domain effect in terminal voltages and currents. In this article, frequency response analysis (FRA) method is used as an efficient method to recognize turn to turn fault. By comparing frequency response in fault and intact conditions, fault detecting in winding becomes possible. In order to determine frequency response, the detailed model is used. Analyzing the model is done by MATLAB software. The accuracy of this model is very dependent on determining its parameters. In order to get more accuracy, parameters of equivalent circuit were estimated by FEM based on design geometrical and material information. Considering frequency dependency of elements has culminated to more accurate results. Finally, the effect of Turn to Turn fault and its location on layer winding of a distribution transformer is evaluated.
{"title":"Detecting and locating turn to turn Fault on layer winding of distribution transformer","authors":"H. afkar, A. Vahedi","doi":"10.1109/CTPP.2014.7040704","DOIUrl":"https://doi.org/10.1109/CTPP.2014.7040704","url":null,"abstract":"Power transformer is the most important and most expensive part of electric power transmission and distribution networks. Among different faults identifying in transformers, identifying winding fault is not easily recognizable because of lower domain effect in terminal voltages and currents. In this article, frequency response analysis (FRA) method is used as an efficient method to recognize turn to turn fault. By comparing frequency response in fault and intact conditions, fault detecting in winding becomes possible. In order to determine frequency response, the detailed model is used. Analyzing the model is done by MATLAB software. The accuracy of this model is very dependent on determining its parameters. In order to get more accuracy, parameters of equivalent circuit were estimated by FEM based on design geometrical and material information. Considering frequency dependency of elements has culminated to more accurate results. Finally, the effect of Turn to Turn fault and its location on layer winding of a distribution transformer is evaluated.","PeriodicalId":226320,"journal":{"name":"2014 5th Conference on Thermal Power Plants (CTPP)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2014-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131416686","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2014-06-10DOI: 10.1109/CTPP.2014.7040711
F. Faradjizadeh, M. Tavakoli, J. Olamaei, E. Afjei
This paper presents a novel control method for an induction machine (IM) connected to the network through the Static Synchronous Series Compensator (SSSC) and parallel capacitor at the IM's terminals. By segregating the operational states into three sequential operational zones namely, normal (0), during-fault (1), and after-fault recovery (2). Each state provides an appropriate controlling process for SSSC to improve the operation of induction machine. In normal operation the goal is to improve the power flow and transient stability. Fault operation deals with rotor acceleration which is decreased by utilizing SSSC in resistive mode. Recovery state employs the Indirect Torque Control (ITC) concept to improve the electro-mechanical stability. Tuning the parameters of the two operational states mentioned above, (1) and (2), modifying the IM's terminal voltage and grid side voltage modification according to Low Voltage Ride-Through (LVRT) limitation is possible. The proposed concept has been proved by time domain simulation in MATLAB power system block sets which shows that suggested method has a more robust operation compared to static synchronous compensator (STATCOM) and less electro-magnetic stresses compared to SSSC without ITC.
{"title":"Using SSSC based induction machines for indirect toque control during fault","authors":"F. Faradjizadeh, M. Tavakoli, J. Olamaei, E. Afjei","doi":"10.1109/CTPP.2014.7040711","DOIUrl":"https://doi.org/10.1109/CTPP.2014.7040711","url":null,"abstract":"This paper presents a novel control method for an induction machine (IM) connected to the network through the Static Synchronous Series Compensator (SSSC) and parallel capacitor at the IM's terminals. By segregating the operational states into three sequential operational zones namely, normal (0), during-fault (1), and after-fault recovery (2). Each state provides an appropriate controlling process for SSSC to improve the operation of induction machine. In normal operation the goal is to improve the power flow and transient stability. Fault operation deals with rotor acceleration which is decreased by utilizing SSSC in resistive mode. Recovery state employs the Indirect Torque Control (ITC) concept to improve the electro-mechanical stability. Tuning the parameters of the two operational states mentioned above, (1) and (2), modifying the IM's terminal voltage and grid side voltage modification according to Low Voltage Ride-Through (LVRT) limitation is possible. The proposed concept has been proved by time domain simulation in MATLAB power system block sets which shows that suggested method has a more robust operation compared to static synchronous compensator (STATCOM) and less electro-magnetic stresses compared to SSSC without ITC.","PeriodicalId":226320,"journal":{"name":"2014 5th Conference on Thermal Power Plants (CTPP)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2014-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132976901","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2014-06-10DOI: 10.1109/CTPP.2014.7040701
M. Asgar, M. Nezamabadi, E. Afjei, A. Siadatan
In weak grid systems that wind power has a significant portion of the power, connecting wind generator output to the network is an important issue. Direct AC to AC converters have become an attractive option for this purpose. They are replacing conventional AC-DC-AC systems and also being used in various industrial applications. These direct converters have more adaptability between input and output characteristics especially when both input and output are not predictable. In this paper the use of two different bidirectional converters in a weak grid system will be studied, DC-Link as an indirect converter and Matrix as a direct converter. The output of a wind power permanent magnet generator (PMG) is first connected to the grid via a DC-Link converter and then the converter is being replaced by a matrix converter (MC). In each step the operation of the system is simulated and the results are compared with each other. Different parameters such as performance, response speed, voltage and frequency regulation and power quality in the operation band are evaluated.
{"title":"Comparison of DC-link and matrix converters for wind PM generator in weak grid systems","authors":"M. Asgar, M. Nezamabadi, E. Afjei, A. Siadatan","doi":"10.1109/CTPP.2014.7040701","DOIUrl":"https://doi.org/10.1109/CTPP.2014.7040701","url":null,"abstract":"In weak grid systems that wind power has a significant portion of the power, connecting wind generator output to the network is an important issue. Direct AC to AC converters have become an attractive option for this purpose. They are replacing conventional AC-DC-AC systems and also being used in various industrial applications. These direct converters have more adaptability between input and output characteristics especially when both input and output are not predictable. In this paper the use of two different bidirectional converters in a weak grid system will be studied, DC-Link as an indirect converter and Matrix as a direct converter. The output of a wind power permanent magnet generator (PMG) is first connected to the grid via a DC-Link converter and then the converter is being replaced by a matrix converter (MC). In each step the operation of the system is simulated and the results are compared with each other. Different parameters such as performance, response speed, voltage and frequency regulation and power quality in the operation band are evaluated.","PeriodicalId":226320,"journal":{"name":"2014 5th Conference on Thermal Power Plants (CTPP)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2014-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133788233","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2014-06-10DOI: 10.1109/CTPP.2014.7040714
S. Yaghubi, M. Tavakoli, F. Faradjizadeh, E. Afjei
This paper studies the effects of eccentricities faults (EFs) on sensorless operation of Switched Reluctance motors (SRMs). EFs are among widespread faults in SRMs which make machine airgap uneven and consequently change SRM characteristics such as phase and mutual inductances. One of the most common methods for indirect rotor position estimation is to apply high frequency pulses to idle phases. As phase inductances vary, current pulses may face some alterations which endanger the proper function of sensorless algorithm. This means machine operation will be impaired or even may be unsustainable. In this paper, via Finite Element Analysis (FEA) machine characteristics is examined under EFs and it is evaluated how they affect SRMs' performance. Two modes for injecting high frequency pulses, namely negative slope of inductance and minimum inductance zone have been considered for current pulses. It is shown that although employed algorithm for pulse injection in minimum inductance is relatively more complicated but it is more fault tolerant than pulsing in negative slope. Using FEA and Matlab/Simulink models the main achievements of the paper are validated.
{"title":"Evaluation of eccentricities faults effects on sensorless operation of Switched Reluctance motors","authors":"S. Yaghubi, M. Tavakoli, F. Faradjizadeh, E. Afjei","doi":"10.1109/CTPP.2014.7040714","DOIUrl":"https://doi.org/10.1109/CTPP.2014.7040714","url":null,"abstract":"This paper studies the effects of eccentricities faults (EFs) on sensorless operation of Switched Reluctance motors (SRMs). EFs are among widespread faults in SRMs which make machine airgap uneven and consequently change SRM characteristics such as phase and mutual inductances. One of the most common methods for indirect rotor position estimation is to apply high frequency pulses to idle phases. As phase inductances vary, current pulses may face some alterations which endanger the proper function of sensorless algorithm. This means machine operation will be impaired or even may be unsustainable. In this paper, via Finite Element Analysis (FEA) machine characteristics is examined under EFs and it is evaluated how they affect SRMs' performance. Two modes for injecting high frequency pulses, namely negative slope of inductance and minimum inductance zone have been considered for current pulses. It is shown that although employed algorithm for pulse injection in minimum inductance is relatively more complicated but it is more fault tolerant than pulsing in negative slope. Using FEA and Matlab/Simulink models the main achievements of the paper are validated.","PeriodicalId":226320,"journal":{"name":"2014 5th Conference on Thermal Power Plants (CTPP)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2014-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130960031","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2014-06-10DOI: 10.1109/CTPP.2014.7040713
J. Khajesalehi, M. Hamzeh, K. Sheshyekani, E. Afjei
In this paper, a power electronic interface (PEI) system is presented to parallel two energy storage battery units with difference current and voltage ratings. The PEI system is based on quasi Z-source inverter (qZSI) which is a single-stage ac/dc converter with two controllable DC ports. In non-controlled parallel operation of battery systems, the load current is shared between them according to their equivalent impedance; therefore, an effective controller is proposed to share load current between the battery systems according to their current ratings. The current sharing between battery systems is achieved by adjusting of the shoot-through duty cycle of inverter legs in a certain load demand. Moreover, the inverter modulation index is used for control of inverter current in a closed-loop configuration. In the grid-connected mode of operation that, each battery system current is independently regulated by adjustment of inverter modulation index and shoot-through duty cycle. The performance of the proposed control system in grid-connected and islanded modes is evaluated by time-domain simulation in MATLAB/Simulink environment.
{"title":"Parallel operating of two energy storage battery systems using quasi Z-source inverter","authors":"J. Khajesalehi, M. Hamzeh, K. Sheshyekani, E. Afjei","doi":"10.1109/CTPP.2014.7040713","DOIUrl":"https://doi.org/10.1109/CTPP.2014.7040713","url":null,"abstract":"In this paper, a power electronic interface (PEI) system is presented to parallel two energy storage battery units with difference current and voltage ratings. The PEI system is based on quasi Z-source inverter (qZSI) which is a single-stage ac/dc converter with two controllable DC ports. In non-controlled parallel operation of battery systems, the load current is shared between them according to their equivalent impedance; therefore, an effective controller is proposed to share load current between the battery systems according to their current ratings. The current sharing between battery systems is achieved by adjusting of the shoot-through duty cycle of inverter legs in a certain load demand. Moreover, the inverter modulation index is used for control of inverter current in a closed-loop configuration. In the grid-connected mode of operation that, each battery system current is independently regulated by adjustment of inverter modulation index and shoot-through duty cycle. The performance of the proposed control system in grid-connected and islanded modes is evaluated by time-domain simulation in MATLAB/Simulink environment.","PeriodicalId":226320,"journal":{"name":"2014 5th Conference on Thermal Power Plants (CTPP)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2014-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114349642","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2014-06-10DOI: 10.1109/CTPP.2014.7040612
M. Sedighizadeh, M. M. Mahmoodi, M. Soltanian
It is important to have an accurate mathematical model of a proton exchange membrane fuel cell (PEMFC) for simulation and design a nalysis. Due to deficiency of manufacture information about the accurate value of parameters required for the modeling, it is necessary to identify these parameters. The proposed Hybrid Big Bang-Big Crunch (HBB-BC) optimization algorithm is a meta-heuristic optimization method in which PSO algorithm is used to make more useful Big Crunch phases in BB-BC optimization. In this work the Hybrid BB-BC optimization is proposed to identify the PEMFC parameters. The HBB-BC results are compared with GA, PSO and BB-BC results to study the usefulness of proposed optimization method and indicate the proposed method is an effective and reliable technique which can be applied to identify the model's parameters of PEMFC.
{"title":"Parameter identification of proton exchange membrane fuel cell using a Hybrid Big Bang-Big Crunch optimization","authors":"M. Sedighizadeh, M. M. Mahmoodi, M. Soltanian","doi":"10.1109/CTPP.2014.7040612","DOIUrl":"https://doi.org/10.1109/CTPP.2014.7040612","url":null,"abstract":"It is important to have an accurate mathematical model of a proton exchange membrane fuel cell (PEMFC) for simulation and design a nalysis. Due to deficiency of manufacture information about the accurate value of parameters required for the modeling, it is necessary to identify these parameters. The proposed Hybrid Big Bang-Big Crunch (HBB-BC) optimization algorithm is a meta-heuristic optimization method in which PSO algorithm is used to make more useful Big Crunch phases in BB-BC optimization. In this work the Hybrid BB-BC optimization is proposed to identify the PEMFC parameters. The HBB-BC results are compared with GA, PSO and BB-BC results to study the usefulness of proposed optimization method and indicate the proposed method is an effective and reliable technique which can be applied to identify the model's parameters of PEMFC.","PeriodicalId":226320,"journal":{"name":"2014 5th Conference on Thermal Power Plants (CTPP)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2014-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123312753","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2014-06-10DOI: 10.1109/CTPP.2014.7040700
J. Morsali, A. Parhizkar, H. Morsali, A. Zeinali
In order to acquire a more stable power unit, it is invaluable to find methods of enhancing plant stability. The position of Khoy combined cycle power plant (CCPP) is strategic from aspects of contribution in providing power for some important local and regional substations in proximity of Turkey. Current steam unit lacks any supplementary stabilizer and trips frequently following of various small and large perturbations. Hence, it seems to be essential to equip the unit with a good-structure industrial power system stabilizer (PSS) such as PSS2B to decrease risk of emergency outages. Nowadays in all over the world, new advanced industrial excitation control systems use IEEE Std. 421.5 to build practical stabilizer of PSS2B from the accelerating power signal to cover a wide range of oscillation frequencies. PSS2B module can be utilized as an add-on to retrofit excitation systems in refurbishment programs. The robust coordinated design of proportional-integral-derivative (PID) based PSS2B and PID-automatic voltage control (AVR) of the steam unit is formulated as a nonlinear optimization problem in which adjustable parameters are optimized simultaneously via an improved particle swarm optimization (IPSO) algorithm by minimizing integral of time multiplied squared error (ITSE) performance index. Siemens RG3 excitation system is modeled according to IEEE AC7B. To evaluate the robustness and effectiveness of recommended stabilizer, eigenvalue analysis and dynamic simulations are performed in MATLAB/SIMULINK for different operating conditions and disturbances. The results show that proposed stabilizer can provide outstanding enhancement in dynamic stability for steam unit to reduce its emergency outages.
{"title":"Recommendation of equipping steam unit of khoy combined cycle power plant with novel PID-PSS2B industrial stabilizer to decrease risk of sudden trips","authors":"J. Morsali, A. Parhizkar, H. Morsali, A. Zeinali","doi":"10.1109/CTPP.2014.7040700","DOIUrl":"https://doi.org/10.1109/CTPP.2014.7040700","url":null,"abstract":"In order to acquire a more stable power unit, it is invaluable to find methods of enhancing plant stability. The position of Khoy combined cycle power plant (CCPP) is strategic from aspects of contribution in providing power for some important local and regional substations in proximity of Turkey. Current steam unit lacks any supplementary stabilizer and trips frequently following of various small and large perturbations. Hence, it seems to be essential to equip the unit with a good-structure industrial power system stabilizer (PSS) such as PSS2B to decrease risk of emergency outages. Nowadays in all over the world, new advanced industrial excitation control systems use IEEE Std. 421.5 to build practical stabilizer of PSS2B from the accelerating power signal to cover a wide range of oscillation frequencies. PSS2B module can be utilized as an add-on to retrofit excitation systems in refurbishment programs. The robust coordinated design of proportional-integral-derivative (PID) based PSS2B and PID-automatic voltage control (AVR) of the steam unit is formulated as a nonlinear optimization problem in which adjustable parameters are optimized simultaneously via an improved particle swarm optimization (IPSO) algorithm by minimizing integral of time multiplied squared error (ITSE) performance index. Siemens RG3 excitation system is modeled according to IEEE AC7B. To evaluate the robustness and effectiveness of recommended stabilizer, eigenvalue analysis and dynamic simulations are performed in MATLAB/SIMULINK for different operating conditions and disturbances. The results show that proposed stabilizer can provide outstanding enhancement in dynamic stability for steam unit to reduce its emergency outages.","PeriodicalId":226320,"journal":{"name":"2014 5th Conference on Thermal Power Plants (CTPP)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2014-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131226212","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2014-06-10DOI: 10.1109/CTPP.2014.7040605
H. Mokhtari, A. Sarajian
In this paper, considering two different scenarios, combined cycle power plant was optimized to reduce total system costs. In the first scenario, parameters of combined cycle power plant were optimized based on power system constraints. But, in the second scenario, they were optimized considering constraints of the power plant. Cost function of power plants includes consumable fuel price (natural gas), maintenance and repair cost and exergy destruction cost, which was fitted with a quadratic equation in this investigation. In both scenarios, combined cycle power plants were optimized by genetic algorithm based on two objective functions of total exergy efficiency of power plant and price function of generated power. The results obtained from these two scenarios showed that the second scenario introduced more optimized cost function than the first one. As a result, calculating cost function of power plant apart from the power system reduced costs of combined cycle power plant and total system and applying constraints of the power system to power plants discharged them from their optimized function and increased the costs.
{"title":"Interaction of combined cycle power plant (CCPP) and power system at two levels of performance optimization","authors":"H. Mokhtari, A. Sarajian","doi":"10.1109/CTPP.2014.7040605","DOIUrl":"https://doi.org/10.1109/CTPP.2014.7040605","url":null,"abstract":"In this paper, considering two different scenarios, combined cycle power plant was optimized to reduce total system costs. In the first scenario, parameters of combined cycle power plant were optimized based on power system constraints. But, in the second scenario, they were optimized considering constraints of the power plant. Cost function of power plants includes consumable fuel price (natural gas), maintenance and repair cost and exergy destruction cost, which was fitted with a quadratic equation in this investigation. In both scenarios, combined cycle power plants were optimized by genetic algorithm based on two objective functions of total exergy efficiency of power plant and price function of generated power. The results obtained from these two scenarios showed that the second scenario introduced more optimized cost function than the first one. As a result, calculating cost function of power plant apart from the power system reduced costs of combined cycle power plant and total system and applying constraints of the power system to power plants discharged them from their optimized function and increased the costs.","PeriodicalId":226320,"journal":{"name":"2014 5th Conference on Thermal Power Plants (CTPP)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2014-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133192491","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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