Study on the method of fault set for AC/DC system operation considering wind power

• Published in: Journal of engineering (Stevenage, England) England), 2019-03, Vol.2019 (16), p.1480-1483
• Main Authors: Han, Hualing, Huang, Ting, Qian, Shuangqiu, Xu, Xiaoyi, Chen, Ning, Zhao, Dawei
• Format: Article
• Language: English
• Subjects: AC network; AC system; AC/DC hybrid power grid; AC/DC system operation; candidate failure lines; cascading fault sequence; commutation; DC system continuous commutation failure; failure analysis; fault set; HVDC power transmission; overvoltage; power grid net; power grids; power line fault; power line transfer; power system; power system faults; power transmission faults; The 14th IET International Conference on AC and DC Power Transmission (ACDC 2018); wind power; wind turbines
• ISSN: 2051-3305; 2051-3305
• DOI: 10.1049/joe.2018.8761

With the rapid development of power system, wind power becomes an important generating way in AC/DC hybrid power grid. Due to the interference between the wind power and the AC network, the risk of DC system continuous commutation failure will be affected. In order to evaluate this effect reasonably, a method for running out of the fault set is presented in this study. Firstly, a distribution factor is proposed to determine the power line transfer after wind power or power line fault, the line with maximum load rate is chosen as the candidate failure lines; Secondly, the η short-circuit ratio and η effective short-circuit ratio indexes of the DC system is evaluated after every fault; they are used to judge whether the cascading fault of AC system induces the transient overvoltage of the converter bus to lead to wind turbines to take off the power grid net. Thus, a cascading fault sequence of the AC system is formed, and a cascading fault set that causes the transient overvoltage of the converter bus is completed. Finally, the simulation results calculated by power system department-bonneville power administration show that when the commutation failure occurs in the DC system, the system runs out immediately, and the validity of the method is verified.