1.Key Laboratory of Power System Intelligent Dispatch and Control of Ministration of Education (Shandong University), Jinan 250061, China;2.NARI Group Corporation (State Grid Electric Power Research Institute), Nanjing 211106, China;3.State Grid Xinjiang Communication Center for Power Dispatching, Urumqi 830063, China
For the sending-end power grid where renewable energy accounts for a relatively high proportion and a large amount of power is sent out through multiple high-voltage direct current (HVDC) lines, HVDC blocking will cause over-frequency problems. Over-frequency generator tripping is an important control measure to restrain the frequency of the sending-end power grid. A setting method for the over-frequency generator tripping scheme is proposed based on considering the over-frequency protection of wind turbines and the active power change of transmission lines when HVDC blocking occurs. It is decomposed into the total generator tripping quantity submodel of the first round and the optimized setting submodel of generator tripping quantity of each basic round. The linear interpolation method and the perturbation method are used comprehensively to solve the generator tripping quantity of each round, and the two-element table is combined for the sensitivity analysis, thus the over-frequency generator tripping scheme is optimized. The effectiveness of the proposed over-frequency generator tripping scheme is verified by an example of a provincial power grid and the adaptability of the proposed scheme is checked in different operation modes.
This work is supported by National Key R&D Program of China (No. 2017YFB0902600) and State Grid Corporation of China (No. SGJS0000DKJS1700840).
|||XIE Yuzheng, ZHANG Hengxu, LI Changgang, et al. Orderly Over-frequency Generator Tripping Strategy for Sending-end Power Grid Considering Wind Turbine Frequency Protection[J/OL]. Automation of Electric Power Systems, http://doi. org/10.7500/AEPS20200511006.|