海上风电经柔直送出系统受端扰动自适应控制策略  

Adaptive Control Strategy for Receiving-end Disturbance of Offshore Wind Power through MMC-HVDC System

作　　者：赵静波 李文博 朱鑫要 孙庆斌 郝全睿[2] ZHAO Jingbo;LI Wenbo;ZHU Xinyao;SUN Qingbin;HAO Quanrui(Electric Power Research Institute of State Grid Jiangsu Electric Power Co.,Ltd.,Nanjing 211103,China;School of Electrical Engineering,Shandong University,Jinan 250061,China)

机构地区：[1]国网江苏省电力有限公司电力科学研究院,江苏南京211103 [2]山东大学电气工程学院,山东济南250061

出　　处：《中国电力》2025年第1期26-38,共13页Electric Power

基　　金：国网江苏省电力有限公司科技项目(J2022016)。

摘　　要：针对海上风电经柔直送出系统受端侧出现扰动的场景,提出了一种保证受端换流站自主运行在安全范围内并实现有功功率在多个送端换流站间合理分配的自适应控制策略,具体包括受端换流站运行限幅控制策略与送端换流站直流电压-频率自适应下垂控制。当受端电网出现扰动导致受端换流站内部电气量越限时,受端换流站运行限幅控制输出用于降低虚拟电势参考值的缩减系数,约束越限电气量回归至限值之内;自适应下垂控制策略考虑送端有功功率裕度和直流电压偏差的约束,自适应调整下垂系数,进而在多个送端换流站间合理分配因受端扰动而使得风场调整的扰动功率,并减小直流电压偏差;送受端侧控制策略共同维持整个系统稳定运行。最后,在PSCAD/EMTDC中搭建3端海上风电经柔直送出系统仿真模型,验证了该方法的有效性与准确性。In view of the scenario of disturbance at the receiving end of offshore wind power through MMC-HVDC system,this paper proposes an adaptive control strategy to ensure the operation of the receiving-end converter station within the non-hazardous range independently and realize the reasonable distribution of active power among multiple sending-end converter stations.It includes the operating limit control strategy of the receiving-end converter station and the Udc-f adaptive droop control strategy of the sending-end converter station.When the disturbance of receiving-end power grid leads to over-limit of internal electrical variables in the receiving-end converter station,the operating limit control will output the reduction coefficient to reduce the reference value of virtual potential,so that the internal electrical variables will return to the limit value.The adaptive droop control strategy is to adjust the droop coefficient adaptively under the constraints of active power margin and DC voltage deviation,so as to reasonably distribute the disturbance power among multiple sending-end converter stations adjusted by the wind farm due to the receiving-end disturbance and reduce the DC voltage deviation.The control strategy of sending-end and receiving-end works together to maintain whole system stability.Finally,a three-terminal MMC-HVDC simulation model is built in PSCAD/EMTDC to verify the effectiveness and accuracy of the proposed method.

关 键 词：海上风场 柔性直流输电 受端扰动 约束条件 自适应控制 自适应下垂控制 运行限幅控制 

分 类 号：TM721.1[电气工程—电力系统及自动化] TM614