scholarly journals An experimental platform of variable speed pumped storage unit under wave disturbance: introduction and preliminary progress

2021 ◽  
Vol 774 (1) ◽  
pp. 012151
Author(s):  
Weijia Yang ◽  
Jiandong Yang ◽  
Wei Zeng ◽  
Zhigao Zhao ◽  
Guiqiao Zheng ◽  
...  
Keyword(s):  
Wave Disturbance ◽  
Variable Speed ◽  
Storage Unit ◽  
Experimental Platform ◽  
Pumped Storage

scholarly journals Hopf Bifurcation and Parameter Sensitivity Analysis of a Doubly-Fed Variable-Speed Pumped Storage Unit

Energies ◽  
2021 ◽  
Vol 15 (1) ◽  
pp. 204
Author(s):  
Zhiwei Zhu ◽  
Xiaoqiang Tan ◽  
Xueding Lu ◽  
Dong Liu ◽  
Chaoshun Li
Keyword(s):  
Renewable Energy ◽  
Hopf Bifurcation ◽  
Transfer Coefficient ◽  
Stability Domain ◽  
State Variables ◽  
Variable Speed ◽  
Storage Unit ◽  
Doubly Fed ◽  
Pumped Storage ◽  
The Stability

The doubly-fed variable speed pumped storage unit is a storage system suitable for joint operation with renewable energy sources to smooth the imbalance between renewable energy supply and electricity demand. However, its working principle and operation control are more complex than those of constant speed pumped storage. In this study, a nonlinear model of doubly-fed variable speed pumped storage units (VSPSUs) considering nonlinear characteristics of the head loss is established. The study finds that a supercritical Hopf bifurcation occurs in the system, and the area enclosed by the lower side of the bifurcation line and the coordinate axis is the stability domain of the system. The active power step perturbation from −0.3 to 0.3 will gradually reduce the area of the stability domain and narrow the adjustable range of the control parameters. In addition, the sensitivity of the model full state variables and the primary and secondary relationships to the changes of subsystem parameters is analyzed systematically using the trajectory sensitivity. It is found that there is a large difference in the sensitivity of different state variables to the parameters. The state variables are much more sensitive to the transfer coefficient of hydraulic turbine torque to guide vane opening, the unit inertia time constant, and the controller proportional gain change than other parameters, which are defined as highly sensitive parameters. The receiver response time constant and the turbine flow-to-head transfer coefficient are the corresponding low-sensitivity parameters.

scholarly journals Fixed-speed and Variable-speed Pumped Storage Dispatch Model in Power Systems with High Renewable Penetration

2018 ◽  
Vol 38 ◽  
pp. 04014
Author(s):  
Bo Yuan ◽  
Jin Zong ◽  
Zhicheng Xu
Keyword(s):  
Power Systems ◽  
Linear Optimization ◽  
Operating Conditions ◽  
Economic Life ◽  
Mixed Integer ◽  
Variable Speed ◽  
Operating Characteristics ◽  
Storage Unit ◽  
New Energy ◽  
Pumped Storage

According to different operating characteristics of pumped storage fixed speed unit and variable speed unit, a joint dispatching model of pumped storage unit and other types of units based on mixed integer linear optimization is constructed. The model takes into account the operating conditions, reservoir capacity, cycle type and other pumped storage unit constraints, but also consider the frequent start and stop and the stability of the operation of the unit caused by the loss. Using the Cplex solver to solve the model, the empirical example of the provincial power grid shows that the model can effectively arrange the pumping storage speed and the dispatching operation of the variable speed unit under the precondition of economic life of the unit, and give full play to the function of peak shaving and accommodating new energy. Because of its more flexible regulation characteristics of power generation and pumping conditions, the variable speed unit can better improve the operating conditions of other units in the system and promote the new energy dissipation.

scholarly journals Research on variable speed operation of static frequency converter for pumped storage units

2021 ◽  
Vol 252 ◽  
pp. 02022
Author(s):  
Haoyuan Li ◽  
Guanjun Li ◽  
Bo Yang ◽  
Liantao Ji
Keyword(s):  
Storage Systems ◽  
Frequency Converter ◽  
Storage System ◽  
Input Power ◽  
Variable Speed ◽  
Storage Unit ◽  
Advantages And Disadvantages ◽  
Doubly Fed ◽  
Pumped Storage ◽  
Storage Units

Constant speed pumped storage unit is widely used, however it cannot adjust the input power when working in the electric mode, and cannot work in the best efficiency when the head of the reservoir changes greatly. Therefore, it is necessary to study and develop the variable speed pumped storage systems. This paper has studied on variable speed operation of static frequency converter for pumped storage units. Besides, development status of variable speed pumped storage system at home and abroad is investigated. Furthermore, classification and advantages and disadvantages of variable speed pumped storage system are also introduced, mainly including two typical variable speed pumped storage systems, i.e., doubly-fed variable speed system and full power variable speed system.

scholarly journals Modelling and Simulation of Doubly-Fed Variable-Speed Pumped Storage Unit

2018 ◽  
Vol 189 ◽  
pp. 022003 ◽  
Author(s):  
Zheng Tan ◽  
Lili Hao ◽  
Tingting Liang ◽  
Tao Wu ◽  
Shanying Li ◽  
...  
Keyword(s):  
Modelling And Simulation ◽  
Variable Speed ◽  
Storage Unit ◽  
Doubly Fed ◽  
Pumped Storage
Sign in / Sign up

Export Citation Format

Share Document