Study of Hydraulic Disturbance Transient Processes in Pumped-Storage Power Stations Considering Electro-Mechanical...

Area of Science:

• Engineering
• Energy Systems
• Fluid Dynamics

Background:

• Pumped-storage power stations are vital for grid stability.
• Hydraulic disturbances are a key concern in their operation.
• Previous research neglected the electrical subsystem's impact on hydraulic disturbances.

Purpose of the Study:

• To develop a coupled model of a grid-connected pumped-storage power station with detailed electrical system representation.
• To investigate the influence of the electrical subsystem on hydraulic disturbances.
• To compare hydraulic transient responses using detailed versus simplified grid models.

Main Methods:

• Development of a multi-domain coupled model (hydraulic, mechanical, electrical, grid).
• Validation of the model using a physical model test platform.
• Systematic comparison of transient responses under different grid modeling conditions.

Main Results:

• Detailed grid modeling identified novel hydraulic disturbance characteristics.
• Operating units compensated for power deficits, reducing pressure fluctuations and increasing output.
• Hydro-mechanical parameters significantly affected unit output and net head.

Conclusions:

• Detailed grid modeling provides a more accurate simulation of hydraulic disturbances.
• Understanding these dynamics is essential for enhancing the security and stability of pumped-storage systems.
• The study offers critical insights for optimizing pumped-storage power station operations.