scholarly journals Research on an Output Power Model of a Doubly-Fed Variable-Speed Pumped Storage Unit with Switching Process

2019 ◽  
Vol 9 (16) ◽  
pp. 3368 ◽  
Author(s):  
Guopeng Zhao ◽  
Jiyun Ren
Keyword(s):  
Mathematical Model ◽  
Power System ◽  
Output Power ◽  
Voltage Regulation ◽  
Switching Process ◽  
Variable Speed ◽  
Pump Mode ◽  
Generating Mode ◽  
Doubly Fed ◽  
Pumped Storage

The doubly-fed variable-speed pumped storage (DFVSPS) is an effective method to balance the fluctuation of renewable energy generation and is an important means of frequency and voltage regulation of a power grid. Firstly, this paper introduces the structure and mathematical model of the DFVSPS unit. Secondly, the control methods of each switching stage in generating mode and pump mode are proposed, and the simulation study of each stage of DFVSPS switching process is carried out by MATLAB/Simulink. Thirdly, when studying the regulating effect of DFVSPS unit in the power system, due to the high switching frequency of converter in the electromagnetic transient model, the simulation speed is very slow and the data volume is large, so the model of DFVSPS unit needs to be simplified. By analyzing the dynamic behavior of the pumped storage power station, the mathematical model of output power of the DFVSPS unit is established, which includes start-up stage, load ramping stage, stable operation stage, load rejection stage and shutdown stage of generating mode and pump mode. Finally, the simplified model of DFVSPS unit is applied to a simple power system to verify its regulating effect on grid power.

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.

Transient Stability of Wind Power System with DFIG

2014 ◽  
Vol 986-987 ◽  
pp. 635-638
Author(s):  
Li Sa Guo
Keyword(s):  
Mathematical Model ◽  
Power System ◽  
Wind Turbine ◽  
Wind Power ◽  
Pitch Angle ◽  
Transient Stability ◽  
Equivalent Model ◽  
Wind Power System ◽  
Doubly Fed ◽  
Infinite Power

Analyzed mathematical model of wind power which consist doubly-fed wind turbine (DFIG).Strategies for pitch angle control were developed.Used MATLAB to establish equivalent model contain infinite power system concluding DFIG ,The results showed that wind power with DFIG have good transient stability.

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

Francis Turbine Modeling for Hydrounit on the Bases of the Doubly Fed Induction Machine

2015 ◽  
Vol 792 ◽  
pp. 203-208
Author(s):  
Rustam Kh. Diyorov ◽  
M.V. Glazyrin
Keyword(s):  
Mathematical Model ◽  
Numerical Modeling ◽  
Induction Machine ◽  
Hydraulic Turbine ◽  
Francis Turbine ◽  
Variable Speed ◽  
Physical Representation ◽  
Doubly Fed Induction Machine ◽  
Doubly Fed ◽  
The Mathematical Model

The mathematical model of Francis turbine, operating at variable speed hydrounit, has created. The results of numerical modeling are fully consistent with the physical representation of the behavior of the hydraulic turbine in dynamic modes.

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