Adaption Studies on High-frequency Generator-tripping Strategy for Sending System of Wind-PV-thermal-bundled Power Transmitted by HVDC

On the high-frequency issue for sending system of wind-PV-thermal-bundled power transmitted by HVDC, the adaptability of existing high-frequency generator tripping strategy is analyzed, and then the improvement strategy is proposed. Firstly, the impacts of wind and PV power integration on system dynamic frequency characteristics are analyzed theoretically. Secondly, based on a provincial grid in the west of China, a variety of typical operation modes are presented to study the adaptability of existing high-frequency generator tripping strategy. Furthermore, some simulation comparisons on the provincial frequency characteristics after system separation are made under different operation modes. Finally, the reason that the existing strategy is not adaptive to power system integrated with large-scale wind power and photovoltaic is analyzed. Meanwhile, the improvement strategy of “first round to trip wind and PV power, and the follow-up rounds to trip thermal power” is proposed. The effectiveness of the proposed strategy under different typical operation modes is verified, and its adaptability is proved.