IEEE1588是关于网络测量和控制系统的精密时间协议(precision time protocol,PTP)标准,其网络对时精度可达亚μs级。文章介绍了IEEE1588标准定义的高精度时钟同步的原理以及PTP时钟模型,针对遵循IEC61850标准的变电站通信网络拓扑结构,...IEEE1588是关于网络测量和控制系统的精密时间协议(precision time protocol,PTP)标准,其网络对时精度可达亚μs级。文章介绍了IEEE1588标准定义的高精度时钟同步的原理以及PTP时钟模型,针对遵循IEC61850标准的变电站通信网络拓扑结构,提出了IEEE1588在数字化变电站内的应用方案,讨论了各方案的优缺点,并给出了时钟设备的冗余配置方法及其功能实现。文章从理论上分析了IEEE1588标准的时钟同步误差,最后从全网的角度探讨了该标准的具体应用策略。展开更多
Optical fiber has been used as typical physical transmission medium in Colombian high power substations for effective communication between substations and control centers. However, suita- ble transmissions of tele-pr...Optical fiber has been used as typical physical transmission medium in Colombian high power substations for effective communication between substations and control centers. However, suita- ble transmissions of tele-protection services continues to be a challenging area in the electrical- supply sector since link stability as well as various performance tests suggest that link recurrence requirements still exhibit limitations when using Metroethernet networks in this context. At pre- sent, improvements have been achieved via proprietary protocols such as Mirrored Bits, which matches the performance of a tele-protection link transmission under normal operation conditions. However, this imposes commercial limitations on the Colombian electrical-supply sector since proprietary protocols hinder fair competition among manufacturers. This is the rationale behind conducting trials with precision time protocol as it is defined in IEEE 1588 standard. The main purpose is to validate whether, under real operation conditions, it is possible to substitute such tele-protection links via Metroethernet networks, yet considering a standard protocol that allows incorporating various pieces of equipment from different manufacturers into the system as well as providing common benefits derived from using this type of communication networks. The present work provides technical results obtained after conducting various simulated tele-trigger tests, including stress tests, where results-stability validation occurs through network-saturation simulations. These saturation conditions are achieved by incorporating additional traffic, which involves several switching events over link paths and permits validating tele-protection-response timing when specifically using IEEE 1588 precision time protocol. Based on the aforementioned reasons as well as on the resulting benefits, a series of laboratory tests have been defined in order to evaluate delay and availability on tele-protection services when transported over IP networks.展开更多
文摘IEEE1588是关于网络测量和控制系统的精密时间协议(precision time protocol,PTP)标准,其网络对时精度可达亚μs级。文章介绍了IEEE1588标准定义的高精度时钟同步的原理以及PTP时钟模型,针对遵循IEC61850标准的变电站通信网络拓扑结构,提出了IEEE1588在数字化变电站内的应用方案,讨论了各方案的优缺点,并给出了时钟设备的冗余配置方法及其功能实现。文章从理论上分析了IEEE1588标准的时钟同步误差,最后从全网的角度探讨了该标准的具体应用策略。
文摘Optical fiber has been used as typical physical transmission medium in Colombian high power substations for effective communication between substations and control centers. However, suita- ble transmissions of tele-protection services continues to be a challenging area in the electrical- supply sector since link stability as well as various performance tests suggest that link recurrence requirements still exhibit limitations when using Metroethernet networks in this context. At pre- sent, improvements have been achieved via proprietary protocols such as Mirrored Bits, which matches the performance of a tele-protection link transmission under normal operation conditions. However, this imposes commercial limitations on the Colombian electrical-supply sector since proprietary protocols hinder fair competition among manufacturers. This is the rationale behind conducting trials with precision time protocol as it is defined in IEEE 1588 standard. The main purpose is to validate whether, under real operation conditions, it is possible to substitute such tele-protection links via Metroethernet networks, yet considering a standard protocol that allows incorporating various pieces of equipment from different manufacturers into the system as well as providing common benefits derived from using this type of communication networks. The present work provides technical results obtained after conducting various simulated tele-trigger tests, including stress tests, where results-stability validation occurs through network-saturation simulations. These saturation conditions are achieved by incorporating additional traffic, which involves several switching events over link paths and permits validating tele-protection-response timing when specifically using IEEE 1588 precision time protocol. Based on the aforementioned reasons as well as on the resulting benefits, a series of laboratory tests have been defined in order to evaluate delay and availability on tele-protection services when transported over IP networks.
