计及安全稳定二、三道防线的电网运行风险评估

为满足电网运行风险"实时分析、预先调控"的安全性要求,提出计及安全稳定二、三道防线的电网运行风险评估方案,解决安全自动装置(安自装置)执行效果与电网实时运行缺乏互动的问题。该方案基于可扩展标记语言XML描述安自装置当值控制策略及定值,在线实时传送至在线动态安全评估系统。在线动态安全评估系统按启动逻辑、动作逻辑和控制设备三元素建立安自装置控制策略模型后,结合电网实时运行数据,评估安自装置当值控制策略在电网预想故障场景下能否保证电网安全稳定运行。进一步根据599号令等有关条款,统计安自装置动作切除设备所造成的电力安全事故事件等级,实现安自装置动作后果的风险评估。该方案首次在广东电网实际应用,效果表明该方案能够计及二、三道防线安自装置当值控制策略的影响,提升在线动态安全评估结果的实时性和准确性。

Risk assessment of power grid operation considering second and third defense line of security and stability

In order to meet the power grid operation safety requirements of "real-time analysis and pre-regulation", a power grid operation risk assessment scheme considering second and third defense lines of security and stability is proposed to solve the security problem from a lack of real-time interaction between automatic-safety device’s control and power gird operation. In this scheme, on duty control strategy and fixed value of automatic-safety device is described with XML language, and it is transmitted to the online dynamic safety assessment system in real time. The online dynamic safety assessment system establishes the control strategy model of the automatic-safety device based on the starting logic, action logic and control equipment, and then evaluates whether the on duty control strategy of the automatic-safety device can guarantee the safe and stable operation of the power grid under the predicted failure scenario based on the real-time operation data of the power grid. The online dynamic safety assessment system further calculates the level of power safety accidents caused by the action of the automatic-safety device according to the relevant provisions such as decree No. 599. Finally, the risk assessment of the automatic-safety device action consequence is realized. The scheme is applied in Guangdong Power Grid for the first time. The effect shows that the scheme can take into account the actual impact of second and third defense lines’ on duty control strategy and improve the accuracy of the online dynamic security assessment results.