An improved automatic voltage coordination control strategy (AVCCS) based on ;automatic voltage control (AVC) and battery energy storage control (BESC) is proposed for photovoltaic grid-connected system (PVGS)...An improved automatic voltage coordination control strategy (AVCCS) based on ;automatic voltage control (AVC) and battery energy storage control (BESC) is proposed for photovoltaic grid-connected system (PVGS) to mitigate the voltage fluctuations caused by environmental disturbances. Only AVC is used when small environ- mental disturbances happen, while BESC is incorporated with AVC to restrain the voltage fluctuations when large disturbances happen. An adjustable parameter determining the allowed amplitudes of voltage fluctuations is introduced to realize the above switching process. A benchmark low voltage distribution system including ]?VGS is established by using the commercial software Dig SILENT. Simulation results show that the voltage under AVCCS satisfies the IEEE Standard 1547, and the installed battery capacity is also reduced. Meanwhile, the battery's service life is ex- tended by avoiding frequent charges/discharges in the control process.展开更多
Two novel improved variants of reptile search algorithm(RSA),RSA with opposition-based learning(ORSA)and hybrid ORSA with pattern search(ORSAPS),are proposed to determine the proportional,integral,and derivative(PID)c...Two novel improved variants of reptile search algorithm(RSA),RSA with opposition-based learning(ORSA)and hybrid ORSA with pattern search(ORSAPS),are proposed to determine the proportional,integral,and derivative(PID)controller parameters of an automatic voltage regulator(AVR)system using a novel objective function with augmented flexibility.In the proposed algorithms,the opposition-based learning technique improves the global search abilities of the original RSA algorithm,while the hybridization with the pattern search(PS)algorithm improves the local search abilities.Both algorithms are compared with the original RSA algorithm and have shown to be highly effective algorithms for tuning the PID controller parameters of an AVR system by getting superior results.Several analyses such as transient,stability,robustness,disturbance rejection,and trajectory tracking are conducted to test the performance of the proposed algorithms,which have validated the good promise of the proposed methods for controller designs.The performances of the proposed design approaches are also compared with the previously reported PID controller parameter tuning approaches to assess their success.It is shown that both proposed approaches obtain excellent and robust results among all compared ones.That is,with the adjustment of the weight factorα,which is introduced by the proposed objective function,for a system with high bandwitdh(α=1),the proposed ORSAPS-PID system has 2.08%more bandwidth than the proposed ORSA-PID system and 5.1%faster than the fastest algorithm from the literature.On the other hand,for a system where high phase and gain margins are desired(α=10),the proposed ORSA-PID system has 0.53%more phase margin and 2.18%more gain margin than the proposed ORSAPS-PID system and has 0.71%more phase margin and 2.25%more gain margin than the best performing algorithm from the literature.展开更多
风能、光伏发电站参与调压控制,必要时可为电网提供紧急无功支撑,达到满足电能质量和降低网损的要求。阐述了地区级电网新能源AVC控制(Automatic Voltage Control)的原理及实际应用,总结归纳了新能源AVC控制并网接入的常见问题,通过35 k...风能、光伏发电站参与调压控制,必要时可为电网提供紧急无功支撑,达到满足电能质量和降低网损的要求。阐述了地区级电网新能源AVC控制(Automatic Voltage Control)的原理及实际应用,总结归纳了新能源AVC控制并网接入的常见问题,通过35 kV新能源AVC子站接入地区级主站实例的综合实验,证明了新能源AVC控制在曲线下发、闭环控制策略及电压跟随等功能的有效性,同时在响应上具备较好的跟随性和快速性。展开更多
自动电压控制(Automatic Voltage Control,AVC)是现代电力系统控制的重要功能,厂站端母线电压自动调节功能对电网的安全与稳定有着重要影响。本文介绍了AVC系统基本原理和自动电压控制技术理论依据,根据现场AVC工程技术经验总结,对AVC...自动电压控制(Automatic Voltage Control,AVC)是现代电力系统控制的重要功能,厂站端母线电压自动调节功能对电网的安全与稳定有着重要影响。本文介绍了AVC系统基本原理和自动电压控制技术理论依据,根据现场AVC工程技术经验总结,对AVC系统结构与通信、AVC子站系统信号与数据流向进行了总结与分析设计,提出了厂站端AVC投退与安全逻辑、增减磁控制逻辑的设计方案,并结合华东电网某抽水蓄能电站现场调试工程应用对所提厂站端AVC系统逻辑设计方案进行了验证,在工程上对AVC逻辑设计与应用具有指导意义。展开更多
为实现西北电网高比例新能源地区的无功优化控制,提出了一种高压直流换流站集中式调相机参与电网自动电压控制(automatic voltage control,AVC)的综合协调控制策略。首先分析了AVC的总体控制思路,按“软分区”思想构造了三级电压控制模...为实现西北电网高比例新能源地区的无功优化控制,提出了一种高压直流换流站集中式调相机参与电网自动电压控制(automatic voltage control,AVC)的综合协调控制策略。首先分析了AVC的总体控制思路,按“软分区”思想构造了三级电压控制模式。针对西北电网和青海电网实际,在网省系统之间建立协调控制变量,结合最优潮流模型,形成了柴达木调相机参与AVC的综合协调控制策略。通过柴达木调相机AVC联调试验时偶遇的电网大扰动实例,验证了控制策略的良好适用性。所提出的AVC控制策略,可使调相机在电网稳态时发挥无功源作用,电网故障时提供瞬时强无功支撑,充分利用新一代调相机性能,提高电网无功电压调节水平。展开更多
根据目前地区电网AVC(Automatic Voltage Control)存在的问题,提出了适合实际电网运行状况的智能AVC定值和策略优化措施。提出了分时段定值整定和特殊厂站定值整定相结合的AVC定值优化方法,并设计了区域调压、就地调压和预调压相结合的...根据目前地区电网AVC(Automatic Voltage Control)存在的问题,提出了适合实际电网运行状况的智能AVC定值和策略优化措施。提出了分时段定值整定和特殊厂站定值整定相结合的AVC定值优化方法,并设计了区域调压、就地调压和预调压相结合的AVC策略。相对原有的AVC控制策略,该优化措施提高了AVC动作的时效性和母线电压合格率,降低了设备动作次数和设备损耗。电网实际案例分析验证了AVC定值和策略优化的有效性。展开更多
自动电压控制(Automatic Voltage Control,AVC)系统是一种基于高级控制技术的电力自动化系统,具有智能化、自适应、快速响应等特点,被广泛用于电网调度和监控。随着电力供需规模不断扩大,电网运行环境越来越复杂,要求电力系统具备更强...自动电压控制(Automatic Voltage Control,AVC)系统是一种基于高级控制技术的电力自动化系统,具有智能化、自适应、快速响应等特点,被广泛用于电网调度和监控。随着电力供需规模不断扩大,电网运行环境越来越复杂,要求电力系统具备更强的自动化、智能化以及可靠性。深入探究AVC系统在电力调度监控工作中的应用,为电力系统研究人员和从业人员提供参考和借鉴。同时,也希望能够为AVC系统的推广应用提供一定的帮助和指导。展开更多
基金Supported by National Basic Research Program of China ("973" Program,No. 2009CB219701 and No. 2010CB234608)Tianjin Municipal Science and Technology Development Program (No. 09JCZDJC25000)Specialized Research Fund for Doctor Discipline of Ministry of Education of China (No. 20090032110064)
文摘An improved automatic voltage coordination control strategy (AVCCS) based on ;automatic voltage control (AVC) and battery energy storage control (BESC) is proposed for photovoltaic grid-connected system (PVGS) to mitigate the voltage fluctuations caused by environmental disturbances. Only AVC is used when small environ- mental disturbances happen, while BESC is incorporated with AVC to restrain the voltage fluctuations when large disturbances happen. An adjustable parameter determining the allowed amplitudes of voltage fluctuations is introduced to realize the above switching process. A benchmark low voltage distribution system including ]?VGS is established by using the commercial software Dig SILENT. Simulation results show that the voltage under AVCCS satisfies the IEEE Standard 1547, and the installed battery capacity is also reduced. Meanwhile, the battery's service life is ex- tended by avoiding frequent charges/discharges in the control process.
文摘Two novel improved variants of reptile search algorithm(RSA),RSA with opposition-based learning(ORSA)and hybrid ORSA with pattern search(ORSAPS),are proposed to determine the proportional,integral,and derivative(PID)controller parameters of an automatic voltage regulator(AVR)system using a novel objective function with augmented flexibility.In the proposed algorithms,the opposition-based learning technique improves the global search abilities of the original RSA algorithm,while the hybridization with the pattern search(PS)algorithm improves the local search abilities.Both algorithms are compared with the original RSA algorithm and have shown to be highly effective algorithms for tuning the PID controller parameters of an AVR system by getting superior results.Several analyses such as transient,stability,robustness,disturbance rejection,and trajectory tracking are conducted to test the performance of the proposed algorithms,which have validated the good promise of the proposed methods for controller designs.The performances of the proposed design approaches are also compared with the previously reported PID controller parameter tuning approaches to assess their success.It is shown that both proposed approaches obtain excellent and robust results among all compared ones.That is,with the adjustment of the weight factorα,which is introduced by the proposed objective function,for a system with high bandwitdh(α=1),the proposed ORSAPS-PID system has 2.08%more bandwidth than the proposed ORSA-PID system and 5.1%faster than the fastest algorithm from the literature.On the other hand,for a system where high phase and gain margins are desired(α=10),the proposed ORSA-PID system has 0.53%more phase margin and 2.18%more gain margin than the proposed ORSAPS-PID system and has 0.71%more phase margin and 2.25%more gain margin than the best performing algorithm from the literature.
文摘风能、光伏发电站参与调压控制,必要时可为电网提供紧急无功支撑,达到满足电能质量和降低网损的要求。阐述了地区级电网新能源AVC控制(Automatic Voltage Control)的原理及实际应用,总结归纳了新能源AVC控制并网接入的常见问题,通过35 kV新能源AVC子站接入地区级主站实例的综合实验,证明了新能源AVC控制在曲线下发、闭环控制策略及电压跟随等功能的有效性,同时在响应上具备较好的跟随性和快速性。
基金Supported by National Natural Science Foundation of China (61273260), Specialized Research Fund for the Doctoral Program of Higher Education of China (20121333120010), Natural Scientific Research Foundation of the Higher Education Institutions of Hebei Province (2010t65), the Major Program of the National Natural Science Foundation of China (61290322), Foundation of Key Labora- tory of System Control and Information Processing, Ministry of Education (SCIP2012008), and Science and Technology Research and Development Plan of Qinhuangdao City (2012021A041)
文摘自动电压控制(Automatic Voltage Control,AVC)是现代电力系统控制的重要功能,厂站端母线电压自动调节功能对电网的安全与稳定有着重要影响。本文介绍了AVC系统基本原理和自动电压控制技术理论依据,根据现场AVC工程技术经验总结,对AVC系统结构与通信、AVC子站系统信号与数据流向进行了总结与分析设计,提出了厂站端AVC投退与安全逻辑、增减磁控制逻辑的设计方案,并结合华东电网某抽水蓄能电站现场调试工程应用对所提厂站端AVC系统逻辑设计方案进行了验证,在工程上对AVC逻辑设计与应用具有指导意义。
文摘为实现西北电网高比例新能源地区的无功优化控制,提出了一种高压直流换流站集中式调相机参与电网自动电压控制(automatic voltage control,AVC)的综合协调控制策略。首先分析了AVC的总体控制思路,按“软分区”思想构造了三级电压控制模式。针对西北电网和青海电网实际,在网省系统之间建立协调控制变量,结合最优潮流模型,形成了柴达木调相机参与AVC的综合协调控制策略。通过柴达木调相机AVC联调试验时偶遇的电网大扰动实例,验证了控制策略的良好适用性。所提出的AVC控制策略,可使调相机在电网稳态时发挥无功源作用,电网故障时提供瞬时强无功支撑,充分利用新一代调相机性能,提高电网无功电压调节水平。
文摘根据目前地区电网AVC(Automatic Voltage Control)存在的问题,提出了适合实际电网运行状况的智能AVC定值和策略优化措施。提出了分时段定值整定和特殊厂站定值整定相结合的AVC定值优化方法,并设计了区域调压、就地调压和预调压相结合的AVC策略。相对原有的AVC控制策略,该优化措施提高了AVC动作的时效性和母线电压合格率,降低了设备动作次数和设备损耗。电网实际案例分析验证了AVC定值和策略优化的有效性。
文摘自动电压控制(Automatic Voltage Control,AVC)系统是一种基于高级控制技术的电力自动化系统,具有智能化、自适应、快速响应等特点,被广泛用于电网调度和监控。随着电力供需规模不断扩大,电网运行环境越来越复杂,要求电力系统具备更强的自动化、智能化以及可靠性。深入探究AVC系统在电力调度监控工作中的应用,为电力系统研究人员和从业人员提供参考和借鉴。同时,也希望能够为AVC系统的推广应用提供一定的帮助和指导。