Optimal Allocation of Synchronous Condensers in an Actual Weak Received Power Grid with an UHVDC System

This paper proposes an optimal allocation method of synchronous condensers in weak received power grids with ultra-high voltage direct current (UHVDC) systems. Taking an actual weak received power grid with an UHVDC system as an example, the transient voltage stability is introduced and a certain scale of spinning reserve has to be retained to keep the voltage stability. And then, an optimal allocation model of synchronous condensers is established to minimize the spinning reserve for voltage stability during peak load periods. Using the sensitivity of spinning reserve deviation and the reactive power injection deviation, the effective buses for synchronous condenser allocation is determined. At last, the optimal number and capacity of synchronous condensers is solved step by step. The actual weak received power grid is used to validate the effectiveness of the proposed method.