Global Transient Flow and Heat Analysis of Synchronous Condenser Based on Dichotomy Iteration and NITA Method Under Voltage Drop in Power Grid
The synchronous condenser is installed in the converter station of the ultra-high voltage transmission system to stabilize the voltage of the transmission system.The possibility of voltage drop faults in the transmission system necessitates its capability to operate effectively under extreme conditions.Temperature rise is one of the important factors that restrict the ultimate adjustment ability of a condenser,so it is necessary to conduct transient flow and heat analysis during the extreme operation of the synchronous condenser.This article establishes a transient analysis model for the coupling between the condenser and the transmission system,and studies the transient response characteristics of the condenser when the power grid voltage drops.In order to comprehensively evaluate the impact of grid voltage drop fault on the thermal characterization of the condenser,a transient analysis model of fluid-solid coupling in the entire domain of a 300 Mvar synchronous condenser is established.The boundary determination method of fluid-solid coupling model based on dichotomy iteration method is proposed,by discretizing hundreds of millions of polyhedral grids(totaling 140 million grid units)and solving the global complex heat transfer model based on the non-iterative time-advancement(NITA)method.The mechanism of the interaction between fluid and temperature in the multi chamber of the condenser is studied.The impact of temperature constraints on the safe operation of the condenser under the extreme operating condition is explored.To validate the research method proposed in this article,a general assembly type test of 300 Mvar synchronous condenser is conducted,proving its feasibility and accuracy.
synchronous condensergrid voltage dropnon-iterative time-advancement(NITA)methodtransient fluid-solid characteristics
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维普
