基于广域信息的直流连续换相失败紧急控制方法  

Emergency Control Method for DC Continuous Commutation Failure Based on Wide-area Information

作　　者：程哲[1] 鲍颜红[2] 任先成[2] 王坚[1] 严明辉 孙雁斌[1] CHENG Zhe;BAO Yanhong;REN Xiancheng;WANG Jian;YAN Minghui;SUN Yanbin(Electric Power Dispatching and Control Center,China Southern Power Grid,Guangzhou 510623,China;Nanjing NARI Group Corporation,State Grid Electric Power Research Institute,Nanjing 210003,China)

机构地区：[1]中国南方电网电力调度控制中心,广州510623 [2]国网电力科学研究院/南京南瑞集团公司,南京210003

出　　处：《电力系统及其自动化学报》2018年第10期77-83,共7页Proceedings of the CSU-EPSA

基　　金：南方电网公司科技项目"南方电网调度操作全过程风险评估决策支持系统建设与研究";国家电网公司科技项目"具备态势感知能力的在线安全稳定趋势分析及控制技术研究"

摘　　要：由于输送功率连续性骤降导致发电机累积加速面积大于减速面积,高压直流连续换相失败故障可能造成送端电网机组相对功角失稳。在广域测量系统中接入直流控保系统的换相失败信号,由电源管理单元采集信息进行临界机群的识别和单机无穷大OMIB系统的等值。采用"在线预决策、实时匹配"的方案,通过OMIB发电机功角特性分析,认为可在预决策计算中确定OMIB发电机临界角度和角速度,在线判断等值发电机角度和角速度是否超过临界值,如超过则匹配相应的预决策控制策略进行控制,避免了单纯依靠轨迹外推预测稳定性和控制决策的可靠性问题。"三华"交直流混联电网的算例分析验证了提出方法的实用性和有效性。The continuous sharp-reduction of transmission power will cause the generator’s cumulative accelerating area to be larger than its decelerating area,and the continuous commutation failure of high-voltage direct current(DC)may result in relative power-angle instability of grid cluster at the sending terminal.In this paper,commutation failure signals of a DC control and protection system are connected into the wide area measurement system(WAMS),and the identification of critical cluster and the equivalence of one machine infinite bus(OMIB)system can be carried out using information collected by phasor measurement unit(PMU).Using the“Online pre decision-making,real-time matching”scheme and through the analysis of power-angle characteristics of an OMIB generator,it is considered that the critical angle and the angular velocity of the generator can be determined by calculations in pre decision-making,and whether the equivalent generator’s angle and angular velocity exceed the critical values can be judged on-line;in the case of larger angles and velocities,the corresponding pre decision-making strategy will be matched.In this way,the stability problem of prediction method that simply relies on trajectory extrapolation and the reliability problem of control decision-making can be avoided.The effectiveness and feasibility of this method is verified by simulation results of a numerical example,i.e.,“Sanhua”AC/DC interconnected power grid.

关 键 词：广域信息 连续换相失败 暂态稳定 紧急控制 

分 类 号：TM76[电气工程—电力系统及自动化]