考虑设备运行状态的频率和电压紧急调控在线预决策

An online pre-decision method for frequency and voltage emergency regulationconsidering running condition of equipment

常规机组被特高压直流和大规模新能源替代导致电网面临严重的频率和电压安全稳定风险,而及时有效的故障后紧急调控可以有效阻止大停电事故的发生。文中提出考虑设备实际运行状态的频率和电压紧急调控在线预决策方法,考虑故障后系统保护、机组一次调频、自动发电控制和自动电压控制等装置动作对节点注入的影响,自动识别故障后准稳态方式,构建以综合控制代价最小为目标的频率和电压预决策模型;通过措施枚举组合形成校核方案,并基于措施调整量快速估算实现校核方案筛选;兼顾频率和电压安全问题进行预决策策略迭代搜索,给出具体设备和控制量,实际故障发生后通过匹配故障和故障后问题进行紧急控制,降低电网事故风险,采用实际电网算例验证了该方法的有效性。

There are risks of frequency and voltage security and stability due to the on-going replacement of conventional synchronous power plants by intermittent generation and DC transmission.Prompt and effective emergency regulation after faults can prevent blackouts.An online pre-decision method for emergency regulation of frequency and voltage security and stability considering running condition of equipment is proposed.Considering the influence of system protection,unit primary frequency regulation,automatic generation control and automatic voltage control on node injection after failure,the quasi-steady state mode after failure is automatically identified,and the frequency and voltage pre-decision-making model with the goal of minimizing comprehensive control cost is constructed.A check plan is formed through the enumeration and combination of measures,and the check plan screening is realized based on the rapid estimation of the measure adjustment amount.The iterative search of the pre-decision strategy taking into account the frequency and voltage safety issues is realized,and the specific equipment and control quantities are given.After the actual fault occurs,emergency control is carried out by matching the fault and the post-fault problem to reduce the risk of grid accidents.The effectiveness of the method is verified by an actual grid calculation example.