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 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 Modelling and control of doubly fed variable-speed pumped storage units for grid power regulation

2017 ◽  
Vol 2017 (13) ◽  
pp. 745-750 ◽  
Author(s):  
Zhao Guopeng ◽  
Zhao Qiang ◽  
Ren Jiyun ◽  
Song Xiaofang ◽  
Han Minxiao
Keyword(s):  
Variable Speed ◽  
Power Regulation ◽  
Doubly Fed ◽  
Pumped Storage ◽  
And Control ◽  
Storage Units

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

scholarly journals Analysis of Control Characteristics and Design of Control System Based on Internal Parameters in Doubly Fed Variable-Speed Pumped Storage Unit

Complexity ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-23
Author(s):  
Guopeng Zhao ◽  
Yongxin Zhang ◽  
Jiyun Ren
Keyword(s):  
Control Strategy ◽  
Control Strategies ◽  
Variable Speed ◽  
Pump Mode ◽  
Storage Unit ◽  
Control Block ◽  
Internal Parameters ◽  
Generating Mode ◽  
Doubly Fed ◽  
Pumped Storage

In this paper, the control strategies and their characteristics when applied to the doubly-fed variable-speed pumped storage unit in generating mode and pump mode are discussed. The composition of doubly fed variable-speed pumped storage unit is introduced, and the mathematical model of every component is proposed. Two control strategies of the unit are introduced. One is the power priority control strategy and the other is the speed priority control strategy. Then, the control block diagrams of the two control strategies in the generating mode and the pump mode are established, and the parameters of the unit in each control strategy are designed. The two control strategies are simulated in power generation and pumping conditions. Finally, the conclusion that power priority strategy has a better effect on power control is obtained.

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.

Optimal planning and sensitivity analysis of green microgrid using various types of storage systems

2020 ◽  
pp. 0309524X2094147
Author(s):  
Sumit Sharma ◽  
Yog Raj Sood
Keyword(s):  
Sensitivity Analysis ◽  
Renewable Energy ◽  
Storage Systems ◽  
Operating Cost ◽  
Indian Policy ◽  
Policy Interventions ◽  
Cost Of Energy ◽  
Pumped Storage ◽  
Test Scenarios ◽  
Storage Units

In this article, a green microgrid is suggested which utilizes renewable energy units such as wind, solar, hydro, and biomass in conjunction with energy storage systems like batteries and the pumped storage. Different test scenarios are investigated to optimally use the power generated from the combined usage of the renewable energy units and the storage units. To judge the performance, a comparative feasibility analysis of the proposed approach is carried out to demonstrate the potential findings based on the total net present cost, levelized cost of energy, operating cost, and initial capital cost. In addition, the proposed solution may be subject to various changes in systems configuration with regard to the wind speed, solar radiation, streamflow, and the electric load; therefore, sensitivity analysis is also presented. Moreover, Indian policy interventions are considered to demonstrate the effectiveness of the proposed approach for a reduction in the overall revenue of the system.

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