计及储能SOC恢复的孤岛直流外送AGC模型预测控制  

AGC model predictive control of islanded HVDC sending end considering SOC recovery of energy storage

作　　者：张海波[1] 段洁琼 奚耀冕 龚贤夫 程鑫 ZHANG Haibo;DUAN Jieqiong;XI Yaomian;GONG Xianfu;CHENG Xin(State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources,North China Electric Power University,Beijing 102206,China;Grid Planning&Research Center,Guangdong Power Grid Corporation,Guangzhou 510080,China)

机构地区：[1]华北电力大学新能源电力系统国家重点实验室,北京102206 [2]广东电网有限责任公司电网规划研究中心,广东广州510080

出　　处：《电力自动化设备》2021年第10期199-204,共6页Electric Power Automation Equipment

基　　金：国家自然科学基金资助项目(51777069);南方电网公司科技项目(037700KK52190010(GDKJXM20198272))。

摘　　要：在交直流并联运行电网中,送端孤岛直流外送系统可避免直流闭锁故障所导致的直流潮流向交流通道大范围转移的问题,但孤岛系统缺乏大电网支撑,系统惯量小,调频能力有限,大规模新能源的随机性出力会给其频率稳定带来严重的影响。针对直流送端孤岛运行状态易于建模预测的特点,提出了计及储能荷电状态(SOC)恢复的孤岛直流外送自动发电控制模型预测控制方法。依据电网等效思路将孤岛电网等效为单一机网模型用于预测电网的未来行为动态;根据多步预测计算区域控制偏差预测值,构造目标函数使得预测值较大时储能系统和火电机组共同参与调频,预测值较小时对储能系统SOC进行恢复;在PSCAD/EMTDC中进行仿真分析,验证所提控制方法的有效性。In the power grid with AC and DC networks in parallel operation,the islanded HVDC sending end system can avoid the problem of large-scale transfer of DC power flow to AC channel caused by DC blocking fault.However,the islanded system lacks the support of large power grid,the system inertia is small,the frequency modulation ability is limited,and the random output of large-scale new energy will seriously affect its frequency stability.In view of the characteristics of easy modeling and prediction of the operation state of the islanded HVDC sending end,the AGC(Automatic Generation Control)model predictive control method is proposed for the islanded HVDC sending end,which takes into account the SOC(State Of Charge)recovery of energy storage.Based on the equivalent idea of power grid,the islanded power grid is equivalent to a single machine network model to predict the future behavior of power grid.According to the multi-step prediction,the predicted value of area control error is calculated,and the objective function is constructed to make the energy storage system and thermal power unit participate in frequency regulation when the predicted value is large,and recover the SOC of energy storage system when the predicted value is small.Simulation analysis is performed in PSCAD/EMTDC to verify the effectiveness of the proposed control method.

关 键 词：孤岛直流外送 自动发电控制 模型预测控制 储能系统 荷电状态 区域控制偏差 

分 类 号：TM761[电气工程—电力系统及自动化]