Measured Results and Simulation Analysis of Transient Process of Pumped Storage Unit in XianJu

2021 ◽  
Author(s):  
L Jiang ◽  
L B Guo ◽  
A H Xiang ◽  
T C Zhou ◽  
D F Wang
Keyword(s):  
Transient Process ◽  
Simulation Analysis ◽  
Storage Unit ◽  
Pumped Storage

Research and Develop on Static Frequency Converter of Pumped Storage Power Plant

2012 ◽  
Vol 608-609 ◽  
pp. 1120-1126 ◽  
Author(s):  
De Shun Wang ◽  
Bo Yang ◽  
Lian Tao Ji
Keyword(s):  
Power Plant ◽  
Control Strategy ◽  
Large Scale ◽  
Frequency Converter ◽  
Position Estimation ◽  
Position Sensor ◽  
Storage Unit ◽  
Rotor Position ◽  
Start Up ◽  
Pumped Storage

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.

Cost advantage of adjustable-speed pumped storage unit for daily operation in distributed hybrid system

2021 ◽  
Author(s):  
Chen Feng ◽  
Yuan Zheng ◽  
Chaoshun Li ◽  
Zijun Mai ◽  
Wei Wu ◽  
...  
Keyword(s):  
Hybrid System ◽  
Cost Advantage ◽  
Storage Unit ◽  
Adjustable Speed ◽  
Pumped Storage

scholarly journals Transient Simulation of Underground Pumped Storage Hydropower Plants Operating in Pumping Mode

Energies ◽  
2020 ◽  
Vol 13 (7) ◽  
pp. 1781 ◽  
Author(s):  
Javier Menéndez ◽  
Jesús M. Fernández-Oro ◽  
Mónica Galdo ◽  
Jorge Loredo
Keyword(s):  
Transient Process ◽  
Ideal Gas ◽  
Compressible Liquid ◽  
Transient Simulation ◽  
Atmospheric Conditions ◽  
Surge Tank ◽  
Two Phase ◽  
Vof Model ◽  
Pumping Mode ◽  
Pumped Storage

The increasing penetration of variable renewable energies (VRE) in the European electricity mix requires flexible energy storage systems (ESS), such as pumped storage hydropower (PSH). Disused mining voids from deep closed mines may be used as subsurface reservoirs of underground pumped-storage hydropower (UPSH) plants. Unlike conventional PSH plants, the air pressure in UPSH plants is variable and it differs from the atmospheric conditions. In this paper, the hydraulic transient process of an UPSH plant operating in pumping mode was investigated and a preliminary thermodynamic analysis of the closed surge tank was carried out. Analytical and CFD three-dimensional numerical simulations based on the volume of fluid (VOF) model with two-phase flow have been performed for analyzing the transient process. In the transient simulation, air and water are considered as ideal gas and compressible liquid, respectively. Different guide vanes closing schemes have been simulated. The obtained results show that the dimensioning of underground reservoir, surge tank, and air ducts is essential for ensuring the hydraulic performance and optimizing the operation of UPSH plants. The static pressure in the air duct, surge tank and lower reservoir reaches −1.6, 112.8 and −4 kPa, respectively, while a heat flux of −80 W was obtained through the surge tank walls.

scholarly journals Characteristics Analysis and Fuzzy Fractional-Order PID Parameter Optimization for Primary Frequency Modulation of a Pumped Storage Unit Based on a Multi-Objective Gravitational Search Algorithm

Energies ◽  
2019 ◽  
Vol 13 (1) ◽  
pp. 137 ◽  
Author(s):  
Xin Wu ◽  
Yanhe Xu ◽  
Jie Liu ◽  
Cong Lv ◽  
Jianzhong Zhou ◽  
...  
Keyword(s):  
Fractional Order ◽  
Pid Controller ◽  
Search Algorithm ◽  
Gravitational Search Algorithm ◽  
Storage Unit ◽  
Water Head ◽  
Pumped Storage ◽  
The Stability ◽  
Primary Frequency ◽  
Fractional Order Pid

Compared with conventional hydropower units, the pumped storage unit has the characteristics of diverse working conditions and frequent switching. Therefore, the stability and regulation quality of the primary frequency modulation transition process of the regulating system is very important. Due to the “S” characteristics of the pumped storage unit (PSU), the pumped storage unit regulating system has a strong nonlinearity, and the conventional proportional-integral-derivative (PID) controller cannot provide high-quality control under low water head conditions. In this paper, the nonlinear PSU model with an elastic water hammer effect is studied, and the fuzzy fractional-order PID (FFOPID) controller is designed to improve the stability of the system. The membership function and the control parameters of the fractional-order PID are optimized based on the multi-objective gravitational search algorithm (MOGSA). The experimental results show that the optimized design of the FFOPID controller has better control quality than the traditional PID controller, the fractional-order PID (FOPID) controller, and the fuzzy PID controller (FPID) when the system is disturbed by the rotating speed under low water head.

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