ALstom断路器在电网系统中占有相当大的比例,特别是在110 k V及以上电网系统中,整体可靠性比较高,但由于最近几年厂家设计变动及其他方面的原因,导致断路器的质量呈下降趋势,在运行中也出现了较多故障。现分析ALstom生产的GL312、GL314...ALstom断路器在电网系统中占有相当大的比例,特别是在110 k V及以上电网系统中,整体可靠性比较高,但由于最近几年厂家设计变动及其他方面的原因,导致断路器的质量呈下降趋势,在运行中也出现了较多故障。现分析ALstom生产的GL312、GL314断路器储能故障原因,并给出相应的处理措施,为断路器的故障诊断及处理提供了意见和建议。展开更多
介绍了一起220 k V GIS断路器储能回路故障的详细经过和故障原因查找、分析过程。在断路器运行中,后台监控电脑发出断路器储能回路打压过流过时告警信号,经过分析储能的电机回路、控制回路、保护回路、信号回路,查出原因是储能时间继电...介绍了一起220 k V GIS断路器储能回路故障的详细经过和故障原因查找、分析过程。在断路器运行中,后台监控电脑发出断路器储能回路打压过流过时告警信号,经过分析储能的电机回路、控制回路、保护回路、信号回路,查出原因是储能时间继电器损坏,动作时间过短,导致储能时间过短,储能不到位。通过对该故障的分析和研究,为解决断路器的类似故障提供一种借鉴。展开更多
A novel fault ride-through strategy for wind turbines,based on permanent magnet synchronous generator,has been proposed.The proposed strategy analytically formulates the reference current signals,disregarding grid fau...A novel fault ride-through strategy for wind turbines,based on permanent magnet synchronous generator,has been proposed.The proposed strategy analytically formulates the reference current signals,disregarding grid fault type and utilizes the whole system capacity to inject the reactive current required by grid codes and deliver maximum possible active power to support grid frequency and avoid generation loss.All this has been reached by taking the grid-side converter’s phase current limit into account.The strategy is compatible with different countries’grid codes and prevents pulsating active power injection,in an unbalanced grid condition.Model predictive current controller is applied to handling rapid transients.During faults,the energy storage system maintains DC-link voltage,which causes voltage fluctuations to be eliminated,significantly.A fault ride-through strategy was proposed for PMSG-based wind turbines,neglecting fault characteristics,second,reaching maximum possible grid support in faulty grid conditions,while avoiding over-current and third,considerable reduction in energy storage system size and power rating.Inspiring simulations have been carried out through MATLAB/SIMULINK to validate the feasibility and competency of the proposed fault ride-through method and efficiency of the entire control system.展开更多
文摘ALstom断路器在电网系统中占有相当大的比例,特别是在110 k V及以上电网系统中,整体可靠性比较高,但由于最近几年厂家设计变动及其他方面的原因,导致断路器的质量呈下降趋势,在运行中也出现了较多故障。现分析ALstom生产的GL312、GL314断路器储能故障原因,并给出相应的处理措施,为断路器的故障诊断及处理提供了意见和建议。
文摘介绍了一起220 k V GIS断路器储能回路故障的详细经过和故障原因查找、分析过程。在断路器运行中,后台监控电脑发出断路器储能回路打压过流过时告警信号,经过分析储能的电机回路、控制回路、保护回路、信号回路,查出原因是储能时间继电器损坏,动作时间过短,导致储能时间过短,储能不到位。通过对该故障的分析和研究,为解决断路器的类似故障提供一种借鉴。
文摘A novel fault ride-through strategy for wind turbines,based on permanent magnet synchronous generator,has been proposed.The proposed strategy analytically formulates the reference current signals,disregarding grid fault type and utilizes the whole system capacity to inject the reactive current required by grid codes and deliver maximum possible active power to support grid frequency and avoid generation loss.All this has been reached by taking the grid-side converter’s phase current limit into account.The strategy is compatible with different countries’grid codes and prevents pulsating active power injection,in an unbalanced grid condition.Model predictive current controller is applied to handling rapid transients.During faults,the energy storage system maintains DC-link voltage,which causes voltage fluctuations to be eliminated,significantly.A fault ride-through strategy was proposed for PMSG-based wind turbines,neglecting fault characteristics,second,reaching maximum possible grid support in faulty grid conditions,while avoiding over-current and third,considerable reduction in energy storage system size and power rating.Inspiring simulations have been carried out through MATLAB/SIMULINK to validate the feasibility and competency of the proposed fault ride-through method and efficiency of the entire control system.
