Numerical simulation and stability analysis of pumping transients in the pumped-storage power plant

A static frequency converter start-up control strategy for pumped-storage power unit is presented. And rotor position detecting without position sensor is realized according to voltage and magnetism equations of ideal synchronous motor mathematics model. The mechanism and implementation method of initial rotor position determination and rotor position estimation under low frequency without position sensor are expounded and validated by simulations. Based on the mentioned control strategy, first set of a static frequency converter start-up device in China for large-scale pumped-storage unit is developed, which is applied to start-up control test in the 90 MW generator/motor of Panjiakou Pumped-storage Power Plant. Test results show that rotor position detecting, pulse commutation, natural commutation, and unit synchronous procedure control of static start-up are all proved. The outcomes have been applied in running equipment, which proves the feasibility of mentioned method.

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The stability analysis and numerical simulation based on Sinc Legendre collocation method for solving a fractional epidemiological model of the Ebola virus

Partial Differential Equations in Applied Mathematics ◽

10.1016/j.padiff.2021.100037 ◽

2021 ◽

Vol 3 ◽

pp. 100037

Author(s):

M.H. Derakhshan

Keyword(s):

Numerical Simulation ◽

Stability Analysis ◽

Collocation Method ◽

Ebola Virus ◽

Epidemiological Model ◽

Simulation Based ◽

Legendre Collocation Method ◽

The Stability

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Numerical Simulation of Intrachamber Processes in the Power Plant

Applied Sciences ◽

10.3390/app11114990 ◽

2021 ◽

Vol 11 (11) ◽

pp. 4990

Author(s):

Boris Benderskiy ◽

Peter Frankovský ◽

Alena Chernova

Keyword(s):

Numerical Simulation ◽

Power Plant ◽

Flow Structure ◽

Power Plants ◽

Control Volume ◽

Conjugate Problem ◽

Topological Features ◽

Gas Dynamic ◽

Calculation Results ◽

Volume Method

This paper considers the issues of numerical modeling of nonstationary spatial gas dynamics in the pre-nozzle volume of the combustion chamber of a power plant with a cylindrical slot channel at the power plant of the mass supply surface. The numerical simulation for spatial objects is based on the solution conjugate problem of heat exchange by the control volume method in the open integrated platform for numerical simulation of continuum mechanics problems (openFoam). The calculation results for gas-dynamic and thermal processes in the power plant with a four-nozzle cover are presented. The analysis of gas-dynamic parameters and thermal flows near the nozzle cover, depending on the canal geometry, is given. The topological features of the flow structure and thermophysical parameters near the nozzle cap were studied. For the first time, the transformation of topological features of the flow structure in the pre-nozzle volume at changes in the mass channel’s geometry is revealed, described, and analyzed. The dependence of the Nusselt number in the central point of stagnation on the time of the power plants operation is revealed.

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