The stable operation of first and second order Zero Crossing Digital Phase Locked Loop (ZCDPLL) is extended by using a Fixed Point Iteration (FPI) method with relaxation. The non-linear components of ZCDPLL such as sa...The stable operation of first and second order Zero Crossing Digital Phase Locked Loop (ZCDPLL) is extended by using a Fixed Point Iteration (FPI) method with relaxation. The non-linear components of ZCDPLL such as sampler phase detector and Digital Controlled Oscillator (DCO) lead to unstable and chaotic operation when the filter gains are high. FPI will be used to stabilize the chaotic operation and consequently extend the lock range of the loop. The proposed stabilized loop can work in higher filter gains which are needed for faster signal acquisition.展开更多
±800 k V侨乡换流站500 k V交流滤波器562、583小组断路器选相合闸功能投入后,出现无法在电压过零点进行准确合闸的问题。通过分析断路器选相合闸装置的功能原理和实际配置,进行了断路器机械性能和带电分合等试验,认为选相合闸装...±800 k V侨乡换流站500 k V交流滤波器562、583小组断路器选相合闸功能投入后,出现无法在电压过零点进行准确合闸的问题。通过分析断路器选相合闸装置的功能原理和实际配置,进行了断路器机械性能和带电分合等试验,认为选相合闸装置的电气合闸时间要短于机械合闸时间,选相合闸的定值整定应适当考虑预击穿时间,必须对断路器的机械特性、预击穿特性进行试验验证,才可以确定正确定值序列,同时保留合理裕度。在合理设置选相合闸控制定值后,最终实现交流滤波器在电压过零点准确合闸。展开更多
装设故障限流装置是解决日益严重的电网短路电流超标问题的有效技术措施之一。基于智能快速断路器技术、短路电流过零点精确相控开断技术研制了一套330 k V开关型零损耗电网故障限流装置。该装置采用模块化设计方法,在正常运行时损耗为...装设故障限流装置是解决日益严重的电网短路电流超标问题的有效技术措施之一。基于智能快速断路器技术、短路电流过零点精确相控开断技术研制了一套330 k V开关型零损耗电网故障限流装置。该装置采用模块化设计方法,在正常运行时损耗为零,短路故障发生20 ms内,可将80 k A及以下的短路电流限制在系统断路器安全开断水平。装置成功在330 k V线路上通过了带电、挂网运行和2次人工单相瞬时短路试验,验证了装置满足安全性、有效性和可靠性的要求。展开更多
文摘The stable operation of first and second order Zero Crossing Digital Phase Locked Loop (ZCDPLL) is extended by using a Fixed Point Iteration (FPI) method with relaxation. The non-linear components of ZCDPLL such as sampler phase detector and Digital Controlled Oscillator (DCO) lead to unstable and chaotic operation when the filter gains are high. FPI will be used to stabilize the chaotic operation and consequently extend the lock range of the loop. The proposed stabilized loop can work in higher filter gains which are needed for faster signal acquisition.
文摘±800 k V侨乡换流站500 k V交流滤波器562、583小组断路器选相合闸功能投入后,出现无法在电压过零点进行准确合闸的问题。通过分析断路器选相合闸装置的功能原理和实际配置,进行了断路器机械性能和带电分合等试验,认为选相合闸装置的电气合闸时间要短于机械合闸时间,选相合闸的定值整定应适当考虑预击穿时间,必须对断路器的机械特性、预击穿特性进行试验验证,才可以确定正确定值序列,同时保留合理裕度。在合理设置选相合闸控制定值后,最终实现交流滤波器在电压过零点准确合闸。
文摘装设故障限流装置是解决日益严重的电网短路电流超标问题的有效技术措施之一。基于智能快速断路器技术、短路电流过零点精确相控开断技术研制了一套330 k V开关型零损耗电网故障限流装置。该装置采用模块化设计方法,在正常运行时损耗为零,短路故障发生20 ms内,可将80 k A及以下的短路电流限制在系统断路器安全开断水平。装置成功在330 k V线路上通过了带电、挂网运行和2次人工单相瞬时短路试验,验证了装置满足安全性、有效性和可靠性的要求。
