摘要
提出一种基于端口能量的含电压源换流器型高压直流输电(VSC-HVDC)的交直流混合系统暂态稳定评估方法。将端口能量描述为端口状态变量和控制变量的函数,进而借助端口能量表征VSC-HVDC系统的暂态能量聚集效应,以避免VSC-HVDC内部复杂控制过程的建模,降低能量函数的构造难度,且可扩展到网络中任意含电力电子器件的端口;进一步,构建基于端口能量的全系统能量函数,通过迭代势能边界面法(IPEBS)进行暂态稳定评估,借助点积判据在系统失稳的转子运动轨迹上搜索势能最大值作为临界能量,确定极限切除时间,实现暂态稳定的快速判别;然后,研究VSC-HVDC接入及VSC-HVDC有功功率、无功功率传输容量对系统暂态稳定性的影响,并评估了不同故障位置对所提能量函数计算精度的影响。最后,通过对修改的IEEE-39节点系统、IEEE-68节点系统和厦门电网柔直工程算例进行仿真分析,验证该方法的准确性和有效性。
This paper proposes a novel transient stability assessment （TSA） method for hybrid AC/DC systems with VSC-HVDC via port energy. The port energy is first described as the function of port state variables and control variables, then the port energy of VSC-HVDC is formulated. This approach can avoid formulating energy function with the complex internal controls of VSC-HVDC, and the port energy can be extended to any power electronics devices. Furthermore, iterative potential energy boundary surface （IPEBS） is employed to TSA. The maximum potential energy is searched on the instability of rotor angle’s swing curves as the critical energy through the dot product criterion. Then, the influence of the VSC-HVDC for transient stability is studied including the VSC-HVDC transmission capacity of active and reactive power. The accuracy of the proposed energy function calculation is discussed via the different fault location, and the feasibility and validity of the proposed method are also demonstrated via the modified IEEE 39-bus system, IEEE 68-bus system and a hybrid Xiamen AC/DC project with VSC-HVDC.
出处
《电工技术学报》
EI
CSCD
北大核心
2018年第3期498-511,共14页
Transactions of China Electrotechnical Society
基金
国家重点研发计划专项(2016YFB0900903)
国家电网公司科技发展计划(NEDU20150002)
国家自然科学基金(51677022
51607033
51607034)资助项目
