In order to deal with the problem of multi-state frequency stability at DC receiving end. this paper studied the variation of inertia time constant and static characteristic coefficient of equivalent machine with or without pumped storage power generation by using the performance indexes of transient. dynamic and static frequency stability. namely reciprocal of instantaneous change rate. https://www.bekindtopets.com/hot-offer-Solo-Jec-9-9-way-dog-vaccine-save-big/