Studies on high-frequency generator tripping strategy for sending system of wind-PV-thermal-bundled power transmitted by HVDC

Large scale of new energy, such as wind and PV power, transmitted by long-distance and large-capacity HVDC, will make the frequency characteristics become more complex. On the high-frequency issue in Ningxia provincial wind-PV-thermal-bundled power grid when DC block and system separation cascading faults happen, the influence of largescale new energy integration on frequency characteristics is analysed. Furthermore, the problems caused by wind-PV-thermal units unordered tripping are assessed, and the corresponding tripping principles are proposed. Finally, based on the supposed principle, a new wind-PV-thermal power-combined high-frequency generator tripping strategy is proposed, which is adaptive to new energy fluctuation system. The effectiveness of the proposed strategy is simulated, and its adaptability is proved.