With the integration of the ultra-high-voltage direct-current (UHVDC) of large capacity. the scheduled outputs of the power plants are limited. and the direct power purchase (DPP) by large consumers is influenced. The negative impact caused by the failure modes of the UHVDC on the economic dispatch (ED) and the security of the power system is to be studied. https://jalyttlers.shop/product-category/peg-box/