Analysis of Frequency Stability Regions under Power Fast Mode in Variable Speed Pumped Storage Plants
Variable speed units(VSUs)demonstrate advantages compared to conventional fixed speed units(FSUs),such as rapidity,high efficiency,flexibility,and reliability in operation and regulation.However,variable speed pumped storage plants(VSPSPs)are still in the early stages of development,and their operational stability during active power regulation requires further investigation.In this paper,the goal is to study the dynamic stability of VSPSPs in active power regulation,based on MATLAB and Simulink as the main tools.First,a numerical model integrating hydraulic-mechanical-electrical subsystems of VSPSPs with doubly fed induction machines is adopted by using MATLAB/Simulink,and a thirteenth-order state matrix is established for theoretical eigen-analysis as the core approach.Then,the time-domain simulations are conducted for further validation and illustration,and the validity and rationality of the theoretical matrix and model are verified.The results show that,even under the grid-connected condition,the VSUs could also lose stability during the active power regulation,which is a new issue that will not arise in FSUs.Therefore,it is necessary to focus on the matching problem between system characteristic parameters and control parameters in the design and operation process of VSPSPs.These results could provide suggestions and technical support for increasing the stability of the operation and regulation of VSPSPs.
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