Dynamic modeling and favorable speed command of variable
Variable-speed pumped-storage unit (VSPSU) has advantages in flexibility, efficiency, and reliability. It has become a state-of-the-art technology in
A nonlinear generalized predictive control for pumped storage unit
Abstract. In this paper, the control problem of pumped storage unit (PSU) has been studied. A nonlinear generalized predictive control (NGPC) method has been applied to design the controller for a PSU. The NGPC controller is designed based on instantaneous linearization model of the control system, and the parameters of the
An Integrated Start-Up Method for Pumped Storage Units Based
Pumped storage units (PSUs) are an important storage tool for power systems containing large-scale renewable energy, and the merit of rapid start-up enable PSUs to modulate and stabilize the power system. In this paper, PSU start-up strategies have been studied and a new integrated start-up method has been proposed for the purpose of achieving swift
High fidelity modeling of pumped storage units for optimal
The example system consists of two TP units, two WP units, two PV units and four PS units, the specific parameters of which are shown in Table 1.The research sets the lower limit of the operating range of the PS units for power generation condition to be 40% of the rated power, and the ramp up/down to be 40% and − 40 %
Fractional-PID and Its Parameter Optimization for Pumped Storage Units
As the core control system of pumped storage units, the pumped storage governing system (PSGS) undertakes the important tasks of manipulating the start-up and shutdown of the unit, the working condition conversions, and the peak regulation and frequency regulation [ 4 ].
Quantifying power regulation characteristics in pump mode of
In pump mode, variable-speed pumped storage units (VSPSUs) have wider power regulation ranges and more flexible power responses than fixed-speed
Model-free adaptive optimal control for fast and safe start-up of pumped storage hydropower units
In addition, as an upgraded version of traditional pumped storage units, variable-speed pumped storage units (VSPSU) have gradually been emphasized and applied due to their fast response capability. The control of this type of unit is more challenging due to its more complex structure, characteristics, and operating conditions
Journal of Energy Storage
The pumped storage unit regulation system mainly consists of governor, hydraulic system, pump/turbine, generator, Each segment is labeled as shown in Fig. 1, and the corresponding specific parameters are shown in Table 4. For detailed parameters of the unit, refer to the related literature [27]. The simulation time is set to be 80 s, and
Journal of Energy Storage
Pumped storage unit (PSU) is an effective regulation tool of the smart power grid system. The inherent "S" characteristics caused by the reversible design of the pump-turbine will make the PSU run into a state of instability, resulting in severe hydraulic fluctuation, unit speed, and frequency oscillation.
2. Hydraulic-Mechanical-Electrical Coupling Model
The refined mathematical model of the regulation system of the pumped storage unit is shown in Section 2. The model of the pump turbine uses the data of the actual unit of a pumped storage power station in China. The water head and model parameters of the power station are shown in Table 1.
Instability analysis of pumped-storage stations under no-load
The Yangjiang pumped-storage station, currently under planning, was taken as an example. The basic information for this station is listed in Table 4. For the maximum water head, the related parameters under the no-load point are calculated as a = 5.01, b = 3.99, e qy = 3.83, and e y = 2.88, based on the characteristic curves.
Liying Wang, Luyao Zhang, Weiguo Zhao * and Xiyuan Liu
pumped storage unit. Appropriate parameters will make the governing system obtain better control The AHA first initialization a set of random solutions and a visit table. In each
The Strategy of Considering the Participation of Doubly-Fed Pumped
Facing the challenges of grid stability brought by the large-scale access of new energy to the grid, as one of the important means of frequency regulation of the grid, the doubly-fed pumped-storage units (DFPSU) have great practical significance in the study of the joint frequency regulation strategy with the thermal power unit (TPU). In
Characteristics Analysis and Fuzzy Fractional-Order PID Parameter Optimization for Primary Frequency Modulation of a Pumped Storage Unit
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
Parameter uncertainty and sensitivity of pumped storage system
The parameters of pumped storage system and power grid have the uncertain characteristics. The parameters of operating conditions also have the uncertain characteristics. Moreover, the surge tank is the most commonly used pressure reduction facility [14], [15] .
Self-starting control strategy of variable speed pumped storage unit
When the pumped storage power station operates in the power generation state, the water flow pushes the water turbine to drive the generator for power generation; under the pumping condition, the traditional constant speed pumped storage unit generally needs to use a static frequency converter (SFC) to realize the no-load
Stability and safety study of pumped storage units based on time
Pumped storage units in the power grid to assume the peak regulation, fill the valley, frequency regulation, phase Detailed parameters of the unit are shown in Table 2. Download : Download high-res image (468KB) Download : Download full-size image; Fig. 2. Upper guide oscillation trend with load. Table 2. Detailed parameters of the pumped
Hydraulic-mechanical-electrical coupled model framework of
This framework provides a reliable model foundation for the optimization of the hydraulic system layout, operation strategy formulation, and dynamic response
(PDF) Hopf Bifurcation and Parameter Sensitivity
In this study, a nonlinear model of doubly-fed variable speed pumped storage units (VSPSUs) considering nonlinear characteristics of the head loss is established.
Energies | Free Full-Text | Hopf Bifurcation and Parameter Sensitivity Analysis of a Doubly-Fed Variable-Speed Pumped Storage Unit
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.
Designs on pumped storage
The primary parameters of the 300MW Guangzhou pumped storage unit are shown in the table below. Basic design principles Based on the analysis of operating
Parameters of pumped hydro storage units | Download
The major parameters of pumped hydro storage station and storage units are presented in Tables 1 and 2. The test system also includes 26 thermal units and 6 hydro-power units, whose
Model-free adaptive optimal control for fast and safe start-up of
Nonlinear modeling of pumped storage unit regulation system. The pumped storage unit regulation system mainly consists of governor, hydraulic system, pump/turbine, generator, and load, as shown in Fig. 1. The hydraulic system also contains upstream reservoir, downstream reservoir, diversion pipeline, surge tank and tailrace tunnel.
A nonlinear generalized predictive control for pumped storage unit
Focused on the hydraulic–mechanical coupled transient behaviors of the pumped-storage unit (PSU), this paper discusses the theoretical implementation and the parameter optimization of tilt
A Fast High-Precision Model of the Doubly-Fed Pumped Storage
The doubly-fed pumped storage unit is a new-type pumped storage unit which owns advantageous like high efficiency, wide tunable speed range, and
Energies | Free Full-Text | Parameter Identification of Pump Turbine
Accurate parameter identification of pump turbine governing system (PTGS) is of great importance to the precise modeling of pumped storage unit. As PTGS is characterized by uncertainties and strong nonlinear characteristics, it is difficult to identify its parameters. To solve the parameter identification problem for PTGS, an improved backtracking
Fractional-PID and Its Parameter Optimization for Pumped Storage Units
Speed governing control is significant in ensuring the stable operation of pumped storage units. In this study, a state-space equation mathematical model of the pumped storage governing system considering the complex hydraulic pipeline structure of the pumped storage plant is proposed to describe the system''s dynamic behaviors
Modeling and Operating Characteristics of Excitation System for
The variable speed pumped storage unit with a full-size converter (FSC-VSPSU) can provide fast and flexible regulation capacity for the power grid, assisting the rapid development of the new energy-dominated power systems, and its application is gradually becoming widespread. The excitation system of FSC-VSPSU is crucial for
Performance enhancement of pumped storage units for
Here, A 0 ∼ A 6 and B 0 ∼ B 7 are depicted in Appendix B. The characteristic parameters of pumped turbine are interpolated from the running point on the characteristic curves. The physical significance of D G is the additional damping torque provided by the PSU against the change of rotational speed, which is of positive
Hydraulic-mechanical-electrical coupled model framework of
The parameters of DFIM are shown in Table B1 and the specifications of each pipeline are shown in Table B2. and dynamic response prediction of variable-speed pumped-storage units. CRediT authorship contribution statement. Chengpeng Liu: Writing – original draft, Software, Methodology, Investigation, Formal analysis,
An Integrated Start-Up Method for Pumped Storage
Pumped storage units (PSUs) are an important storage tool for power systems containing large-scale renewable energy, and the merit of rapid start-up enable PSUs to modulate and stabilize the power system. In this
Performance enhancement of pumped storage units for
The comparison of three measures including 12 scenarios verifies the competitive advantage of co-optimization strategy in multi-machine system. This paper
Design study of a stand-alone desalination system
3.1.2.. Desalination unitThe correlation between hourly water demand, and the corresponding power for desalination, P DEM (or the hourly energy demand, E DEM) is given by Eq. (3), assuming an average specific energy consumption for desalination, S DC.Today, reverse-osmosis desalination units require 2–4 kW h to produce 1 m 3 of
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