Comprehensive Stability Analysis of the Hydropower Units with Complex Hydraulic Coupling Based on a Fast Stability Domain Solving Method
The stability of the multi-unit systems (MUS) with complex hydraulic coupling under various operating conditions is important to the hydropower plants (HPPs). Currently, the batch solution of the stability domain of the higher-order system is too time-consuming and the re-computation is cumbersome after changing the order, which makes it difficult to fully estimate the stability of the MUS. Therefore, this paper investigates the comprehensive stability of the MUS under various operating conditions using a novel stability domain solving method. Firstly, models for an actual HPPs with three-turbine sharing a long tailrace are established under consideration of different operating scenarios. Then, a trajectory search method is proposed to quickly and flexibly solve the stability domain of the MUS. Finally, the stability domain of the MUS under full hydroturbine operating conditions and multiple operating scenarios are calculated and analyzed. The results show that the stability of the MUS is poor when the hydroturbine operates at a water head of 215~225m and a guide vane opening within 55~70%. In addition, the reduction of running units will significantly deteriorate the comprehensive stability of the MUS. The relevant conclusions can provide necessary theoretical guidance for the optimal operation and adjustment of control parameters of HPPs
Year of publication: |
[2022]
|
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Authors: | Lu, Xueding ; Li, Chaoshun ; Liu, Dong ; Zhu, Zhiwei ; Tan, Xiaoqiang ; Xu, Rongli |
Publisher: |
[S.l.] : SSRN |
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