A single machine-infinite-bus(SMIB) system including the interline power flow controllers(IPFCs) and the power system stabilizer(PSS) controller is addressed. The linearized system model is considered for investigatin...A single machine-infinite-bus(SMIB) system including the interline power flow controllers(IPFCs) and the power system stabilizer(PSS) controller is addressed. The linearized system model is considered for investigating the interactions among IPFC and PSS controllers. To improve the stability of whole system again different disturbances, a lead-lag controller is considered to produce supplementary signal. The proposed supplementary controller is implemented to improve the damping of the power system low frequency oscillations(LFOs). Imperialist optimization algorithm(ICA) and shuffled frog leaping algorithm(SFLA) are implemented to search for optimal supplementary controllers and PSS parameters. Moreover, singular value decomposition(SVD) method is utilized to select the most effective damping control signal of IPFC lead-lag controllers. To evaluate the system performance, different operating conditions are considered. Reponses of system in five modes including uncoordinated and coordinated modes of IPFC and PSS using ICA and SFLA are studied and compared. Considering the results, response of system without controller shows the highest overshoot and the longest settling time for rotor angel at the different operating conditions. In this mode of system, rotor speed has the highest overshoot. Rotor angel in the system with only PSS includes lower overshoot and oscillation than system without controller. When PSS is only implemented, rotor speed deviation has the longest settling time. Rotor speed deviation in the uncoordinated mode of IPFC and PSS shows lower overshoot than system with only PSS and without controller. It is noticeable that in this mode, rotor angel has higher overshoot than system with only PSS. The superiority of the suggested ICA-based coordinated controllers is obvious compared with SFLA-based coordinated controllers and other system modes. Responses of coordinated PSS and IPFC SFLA-based supplementary controllers include higher peak amplitude and longer settling time compared with coordinated IPFC and PSS ICA-based controllers. This comparison shows that overshoots, undershoots and the settling times are reduced considerably in coordinated mode of IPFC based controller and PSS using ICA. Analysis of the system performance shows that the proposed method has excellent response to different faults in power system.展开更多
同相补偿装置主要负责消除负序、补偿无功以及滤除谐波,实现平衡变换,基于线间潮流控制器(Inter line power flow controller,简称IPFC)的同相补偿装置还能实现机车制动时的能量回馈。现主要围绕Scott变压器和IPFC结构的单相组合式同相...同相补偿装置主要负责消除负序、补偿无功以及滤除谐波,实现平衡变换,基于线间潮流控制器(Inter line power flow controller,简称IPFC)的同相补偿装置还能实现机车制动时的能量回馈。现主要围绕Scott变压器和IPFC结构的单相组合式同相供电装置,对其拓扑结构和补偿原理进行论述,为控制策略的提出及设备的研制奠定理论基础。展开更多
This paper proposes new methodology for the placement of FACTS devices in transmission systems to reduce congestion. Congestion management comprises congestion relief and congestion cost. The traditional approach to r...This paper proposes new methodology for the placement of FACTS devices in transmission systems to reduce congestion. Congestion management comprises congestion relief and congestion cost. The traditional approach to remedying congestion lies in reinforcing the system with additional transmission capacity. Although still feasible, this approach is becoming more and more complex and it is often challenged by the public [1]. Congestion relief can be handled by using FACTS devices, where transmission capability may be improved. Congestion relief using FACTS devices requires a two step approach: first, the optimal location of these devices in the network and then, the settings of their control parameters. UPFC and IPFC have full dynamic control on the transmission parameters, voltage, line impedance and phase angle. Real Genetic Algorithm (RGA) optimization technique is used to solve this congestion relief problem while analytical hierarchy process (AHP) with fuzzy sets is implemented to evaluate RGA fitness function. The results are obtained for modified IEEE 5 bus Test System.展开更多
This paper presents a new approach for determining the effective control signals for damping of oscillations by using fuzzy logic based Interline Power Flow Controller [IPFC]. The IPFC performance is tested with PI co...This paper presents a new approach for determining the effective control signals for damping of oscillations by using fuzzy logic based Interline Power Flow Controller [IPFC]. The IPFC performance is tested with PI controllers in comparison with fuzzy logic based controller on Modified Phllips-Heffron Model of Single Machine Infinite Bus System to achieve improved damping performance by selecting effective control signals such as deviation in pulse width modulation index of voltage series converter 1 in line 1, pulse width modulation index of voltage series converter 2 in line 2, deviation in phase angle of the injected voltage of convertor 1, injected voltage phase angle deviation of convertor 2. Investigations reveal that coordinated tuning of Interline Power Flow Controller with Fuzzy Logic Controller provides the robust dynamic performance. The Fuzzy Logic Based Interline Power Flow Controller [IPFC] is designed with simple fuzzy rules to coordinate the additional damping signal. The proposed controllers for IPFC are able to achieve improved designed performance of the power system. Validity of effective control signals has been done by eigen value analysis.展开更多
In this paper, the nonlinear dynamic model of a multi machine power system incorporated with Interline Power Flow Controller [IPFC] has been developed for improvement in damping of power system oscillations and transi...In this paper, the nonlinear dynamic model of a multi machine power system incorporated with Interline Power Flow Controller [IPFC] has been developed for improvement in damping of power system oscillations and transient stability. The IPFC performance is tested with PI controllers in comparison with fuzzy logic based controller under healthy and abnormal operating conditions. The IPFC fuzzy controller is design to coordinate two control inputs: change in voltage and change in capacitor voltage to improve the transient stability of the multimachine system. The Interline Power Flow Controller [IPFC] with fuzzy logic controller is designed with simple fuzzy rules to coordinate the additional damping signal. The proposed controller for IPFC is able to achieve improved designed performance of the power system. Digital simulations are carried out in MATLAB environment.展开更多
线间潮流控制器(interline power flow controller,IPFC)作为一种潮流调节能力强大的柔性交流输电(flexible alternating-current transmission system,FACTS)控制装置,能够动态控制电力系统的有功、无功、电压、阻抗和功角,对有着任意...线间潮流控制器(interline power flow controller,IPFC)作为一种潮流调节能力强大的柔性交流输电(flexible alternating-current transmission system,FACTS)控制装置,能够动态控制电力系统的有功、无功、电压、阻抗和功角,对有着任意相角关系、属于不同系统的线路进行潮流控制,提高系统运行稳定水平。"十四五"期间,由于苏北大规模风电、光伏等新能源接入电网,江苏电网整体呈现"北电南送"趋势。当冬季新能源出力较大时,过江输电通道由于潮流分布不均,部分500 k V线路无法满足N-1、N-2校核。为此本文研究了IPFC在江苏电网的应用场景,提出了将IPFC安装于两条过江通道,协调两条通道潮流,提升过江断面潮流输送能力。随后通过在不同系统运行工况下,对IPFC设备的综合调节能力及容量进行充分评估,优化了IPFC设备的容量及系统级控制策略。展开更多
新出现的线间潮流控制器IPFC(Interlin Power Flow Controller)是柔性交流输电系统FACTS控制装置中最好的一种控制装置,它可以同时独立控制母线电压和线路上的有功和无功功率潮流.通过比较IPFC在不同线路上的电压等级和容量大小的补偿...新出现的线间潮流控制器IPFC(Interlin Power Flow Controller)是柔性交流输电系统FACTS控制装置中最好的一种控制装置,它可以同时独立控制母线电压和线路上的有功和无功功率潮流.通过比较IPFC在不同线路上的电压等级和容量大小的补偿容量效果,得出IPFC是解决有功和无功潮流平衡的理想方案,并提出了应尽量使高电压大功率的线路向低电压小功率的线路提供所需的有功功率,优化功率传输的模糊控制方案,为线间潮流控制器控制结构研究提供解决方案.展开更多
由平衡变压器和综合潮流控制器(integrated power flow controller,IPFC)组合构成的同相牵引供电系统可解决负序电流、谐波电流、无功电流的补偿及电分相方面存在的问题,分析了该供电系统的补偿原理,比较了牵引和再生制动状态同相牵引...由平衡变压器和综合潮流控制器(integrated power flow controller,IPFC)组合构成的同相牵引供电系统可解决负序电流、谐波电流、无功电流的补偿及电分相方面存在的问题,分析了该供电系统的补偿原理,比较了牵引和再生制动状态同相牵引供电系统对电力系统供电质量的影响,指出制动状态下IPFC可在不改变控制策略的情况下将能量平衡地回馈到三相电网,节约电能。仿真结果验证了同相牵引供电方案的正确性。展开更多
基于YNvd平衡变压器和综合潮流控制器(integrated power flow controller,IPFC)相结合构成的同相供电系统,在机车运行状态改变时进行了仿真分析。当同相供电系统采用传统型电流检测方法,在机车由牵引状态转变为电气制动状态时,由于传统...基于YNvd平衡变压器和综合潮流控制器(integrated power flow controller,IPFC)相结合构成的同相供电系统,在机车运行状态改变时进行了仿真分析。当同相供电系统采用传统型电流检测方法,在机车由牵引状态转变为电气制动状态时,由于传统型电流检测方法的缺陷性,IPFC直流侧电容电压会急剧上升。而基于Fryze功率定义的改进型电流检测方法则可以避免该问题,另外改进型电流检测方法可应用于部分补偿模式。仿真结果证明了改进型电流检测方法的可行性。展开更多
文摘A single machine-infinite-bus(SMIB) system including the interline power flow controllers(IPFCs) and the power system stabilizer(PSS) controller is addressed. The linearized system model is considered for investigating the interactions among IPFC and PSS controllers. To improve the stability of whole system again different disturbances, a lead-lag controller is considered to produce supplementary signal. The proposed supplementary controller is implemented to improve the damping of the power system low frequency oscillations(LFOs). Imperialist optimization algorithm(ICA) and shuffled frog leaping algorithm(SFLA) are implemented to search for optimal supplementary controllers and PSS parameters. Moreover, singular value decomposition(SVD) method is utilized to select the most effective damping control signal of IPFC lead-lag controllers. To evaluate the system performance, different operating conditions are considered. Reponses of system in five modes including uncoordinated and coordinated modes of IPFC and PSS using ICA and SFLA are studied and compared. Considering the results, response of system without controller shows the highest overshoot and the longest settling time for rotor angel at the different operating conditions. In this mode of system, rotor speed has the highest overshoot. Rotor angel in the system with only PSS includes lower overshoot and oscillation than system without controller. When PSS is only implemented, rotor speed deviation has the longest settling time. Rotor speed deviation in the uncoordinated mode of IPFC and PSS shows lower overshoot than system with only PSS and without controller. It is noticeable that in this mode, rotor angel has higher overshoot than system with only PSS. The superiority of the suggested ICA-based coordinated controllers is obvious compared with SFLA-based coordinated controllers and other system modes. Responses of coordinated PSS and IPFC SFLA-based supplementary controllers include higher peak amplitude and longer settling time compared with coordinated IPFC and PSS ICA-based controllers. This comparison shows that overshoots, undershoots and the settling times are reduced considerably in coordinated mode of IPFC based controller and PSS using ICA. Analysis of the system performance shows that the proposed method has excellent response to different faults in power system.
文摘同相补偿装置主要负责消除负序、补偿无功以及滤除谐波,实现平衡变换,基于线间潮流控制器(Inter line power flow controller,简称IPFC)的同相补偿装置还能实现机车制动时的能量回馈。现主要围绕Scott变压器和IPFC结构的单相组合式同相供电装置,对其拓扑结构和补偿原理进行论述,为控制策略的提出及设备的研制奠定理论基础。
文摘This paper proposes new methodology for the placement of FACTS devices in transmission systems to reduce congestion. Congestion management comprises congestion relief and congestion cost. The traditional approach to remedying congestion lies in reinforcing the system with additional transmission capacity. Although still feasible, this approach is becoming more and more complex and it is often challenged by the public [1]. Congestion relief can be handled by using FACTS devices, where transmission capability may be improved. Congestion relief using FACTS devices requires a two step approach: first, the optimal location of these devices in the network and then, the settings of their control parameters. UPFC and IPFC have full dynamic control on the transmission parameters, voltage, line impedance and phase angle. Real Genetic Algorithm (RGA) optimization technique is used to solve this congestion relief problem while analytical hierarchy process (AHP) with fuzzy sets is implemented to evaluate RGA fitness function. The results are obtained for modified IEEE 5 bus Test System.
文摘This paper presents a new approach for determining the effective control signals for damping of oscillations by using fuzzy logic based Interline Power Flow Controller [IPFC]. The IPFC performance is tested with PI controllers in comparison with fuzzy logic based controller on Modified Phllips-Heffron Model of Single Machine Infinite Bus System to achieve improved damping performance by selecting effective control signals such as deviation in pulse width modulation index of voltage series converter 1 in line 1, pulse width modulation index of voltage series converter 2 in line 2, deviation in phase angle of the injected voltage of convertor 1, injected voltage phase angle deviation of convertor 2. Investigations reveal that coordinated tuning of Interline Power Flow Controller with Fuzzy Logic Controller provides the robust dynamic performance. The Fuzzy Logic Based Interline Power Flow Controller [IPFC] is designed with simple fuzzy rules to coordinate the additional damping signal. The proposed controllers for IPFC are able to achieve improved designed performance of the power system. Validity of effective control signals has been done by eigen value analysis.
文摘In this paper, the nonlinear dynamic model of a multi machine power system incorporated with Interline Power Flow Controller [IPFC] has been developed for improvement in damping of power system oscillations and transient stability. The IPFC performance is tested with PI controllers in comparison with fuzzy logic based controller under healthy and abnormal operating conditions. The IPFC fuzzy controller is design to coordinate two control inputs: change in voltage and change in capacitor voltage to improve the transient stability of the multimachine system. The Interline Power Flow Controller [IPFC] with fuzzy logic controller is designed with simple fuzzy rules to coordinate the additional damping signal. The proposed controller for IPFC is able to achieve improved designed performance of the power system. Digital simulations are carried out in MATLAB environment.
文摘线间潮流控制器(interline power flow controller,IPFC)作为一种潮流调节能力强大的柔性交流输电(flexible alternating-current transmission system,FACTS)控制装置,能够动态控制电力系统的有功、无功、电压、阻抗和功角,对有着任意相角关系、属于不同系统的线路进行潮流控制,提高系统运行稳定水平。"十四五"期间,由于苏北大规模风电、光伏等新能源接入电网,江苏电网整体呈现"北电南送"趋势。当冬季新能源出力较大时,过江输电通道由于潮流分布不均,部分500 k V线路无法满足N-1、N-2校核。为此本文研究了IPFC在江苏电网的应用场景,提出了将IPFC安装于两条过江通道,协调两条通道潮流,提升过江断面潮流输送能力。随后通过在不同系统运行工况下,对IPFC设备的综合调节能力及容量进行充分评估,优化了IPFC设备的容量及系统级控制策略。
文摘新出现的线间潮流控制器IPFC(Interlin Power Flow Controller)是柔性交流输电系统FACTS控制装置中最好的一种控制装置,它可以同时独立控制母线电压和线路上的有功和无功功率潮流.通过比较IPFC在不同线路上的电压等级和容量大小的补偿容量效果,得出IPFC是解决有功和无功潮流平衡的理想方案,并提出了应尽量使高电压大功率的线路向低电压小功率的线路提供所需的有功功率,优化功率传输的模糊控制方案,为线间潮流控制器控制结构研究提供解决方案.
文摘由平衡变压器和综合潮流控制器(integrated power flow controller,IPFC)组合构成的同相牵引供电系统可解决负序电流、谐波电流、无功电流的补偿及电分相方面存在的问题,分析了该供电系统的补偿原理,比较了牵引和再生制动状态同相牵引供电系统对电力系统供电质量的影响,指出制动状态下IPFC可在不改变控制策略的情况下将能量平衡地回馈到三相电网,节约电能。仿真结果验证了同相牵引供电方案的正确性。
文摘基于YNvd平衡变压器和综合潮流控制器(integrated power flow controller,IPFC)相结合构成的同相供电系统,在机车运行状态改变时进行了仿真分析。当同相供电系统采用传统型电流检测方法,在机车由牵引状态转变为电气制动状态时,由于传统型电流检测方法的缺陷性,IPFC直流侧电容电压会急剧上升。而基于Fryze功率定义的改进型电流检测方法则可以避免该问题,另外改进型电流检测方法可应用于部分补偿模式。仿真结果证明了改进型电流检测方法的可行性。
