Short‐circuit analysis of pumped storage unit during back‐to‐back starting

Abstract

Back-to-back starting is a widely accepted starting method for pumped storage units. A back-to-back starting model of pumped storage units was built using the ElectroMagnetic Transients Program including DC (EMTDC) software package. The short-circuit fault during back-to-back starting was investigated for the first time. The starting process was simulated and compared with real data from a pumped storage power plant in northeast China. The rotor speed and the effect of resistance during fault period were also discussed. The results showed that the fault current has significant magnitude and low-frequency characteristic. Recommendations were provided to realise secure and reliable fault clearance during back-to-back starting based on the fault characteristics and real de-excitation test results of the pumped storage power plant.

Loss‐of‐excitation analysis and protection for pumped‐storage machines during starting

“…It is defined that u d , u q , i d , i q are voltages, currents of d ‐axis and q ‐axis, respectively, u f , i f are excitation voltage and current, i D , i Q are currents of damping windings. According to the voltage–current equations, the flux–current equations and the rotor motion equations, the mathematical model of a driven synchronous machine during starting is represented by the following equation [8, 18]where A and B are the coefficient matrices determined by the parameters of the synchronous machine. p is the time derivative operator.…”

“…The short‐circuit fault analysis during starting had been analysed in detail and the fault isolation strategy was proposed in [18]. LOE phenomena and its protection during starting or variable speed operation must be investigated further.…”

Analysis on Guide Vane Closure Schemes of High‐Head Pumped Storage Unit during Pump Outage Condition

“…Out of all green technologies installed in the world, hydropower remains the largest and most common [2] and competitive [3,4]. Hydropower systems are used to store and convert potential energy into electrical energy, through pumped storage equipment [5,6]. Given equipment is useful for solving the intermittence issues of renewable resources and is widely backed for its high capacity, reliability, and economics [7,8].…”

Dynamical assessment of a PTGS with time delay

“…The pumped-storage power station is a special power source that has flexible operation modes and multiple functions [6][7][8][9][10][11]. The pump-turbine governing system (PTGS), as a critical part of the pumped-storage power station, not only consists of multiple parts, but also has many typical transient processes [12][13][14]. The existing model experiments do not fully reflect the possible dangers that may occur during extreme conditions in actual pumped-storage power stations because of the lack of data during transient conditions.…”