Modeling a pumped storage hydropower integrated to a hybrid power system with solar-wind power and its stability analysis

Xu, Beibei; Chen, Diyi; Venkateshkumar, M.; Xiao, Yu; Yan, Yonghong; Xing, Yanqiu; Li, Peiquan

doi:10.1016/j.apenergy.2019.04.125

Cited by 183 publications

(68 citation statements)

References 27 publications

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“…is positively correlated with Q c , and it will be replaced by Qc in Equation (15). Therefore, M(x n ) can be expressed as:…”

Section: {F0mentioning

confidence: 99%

“…With the rapid development of control technology and power electronics, pumped storage with a full-size converter (FSC) and the characteristics of variable speed have become an important development trend. Pumped storage with these characteristics can quickly adjust the active power and reactive power to balance voltage and frequency fluctuations caused by renewable energy [14,15]. In [16,17], the application of a variable-speed pumped storage station (VSPSS) with FSC was studied in stabilizing renewable energy, and the results showed that VSPSS had better smoothing effects when its capacity was adequate.…”

Section: Introductionmentioning

confidence: 99%

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An Optimal Wavelet Packets Basis Method for Cascade Hydro-PV-Pumped Storage Generation Systems to Smooth Photovoltaic Power Fluctuations

Wang

Sun

et al. 2019

Energies

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Due to the volatility of natural resources, the power fluctuations of photovoltaic (PV) generation have serious negative impacts on the power quality. This paper reports a novel approach to resolve this problem in a combined cascade hydro-PV-pumped storage (CH-PV-PS) generation system through appropriate power distribution on a small time scale. According to the characteristics of power generation systems and multi-constraints, how to obtain the optimal smoothing effects with the small cost is a key challenge. For this purpose, wavelet packet decomposition is modified by constructing cost function and ideal power trajectory sequences to obtain a new adaptive power distribution method for the CH-PV-PS generation system considering the boundary conditions of the system in this paper. At the same time, to meet the real-time control requirements of actual systems, an additive function is presented to improve the optimization speed of the adaptive power distribution method. In the meantime, a fuzzy controller is designed to optimize the inevitable delay time of the power scheduling system, and the starting threshold is set to avoid the frequently mode conversion of pumped storage. Finally, the performance of the method is evaluated based on the PV station data in Xiaojin County, Sichuan Province, China. Simulation results based on Matlab-simulink indicate that the proposed method can effectively suppress PV power fluctuations and ensure normal operation of the CH-PV-PS generation system within the multiple constraints.

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“…is positively correlated with Q c , and it will be replaced by Qc in Equation (15). Therefore, M(x n ) can be expressed as:…”

Section: {F0mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

An Optimal Wavelet Packets Basis Method for Cascade Hydro-PV-Pumped Storage Generation Systems to Smooth Photovoltaic Power Fluctuations

Wang

Sun

et al. 2019

Energies

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“…(1) For modeling and simulation of PSS, the rigid [12] or elastic water hammer model [13] of pipeline system and the internal characteristics model for pump turbine [14], [15] are the classical linear model, they have a high real-time performance, but the simulation accuracy is poor in pumped outage condition. The model of characteristic (MOC) [16]- [18] has been widely used in the simulation of transient process, which has excellent computational accuracy and huge simulation time.…”

Section: Introductionmentioning

confidence: 99%

Coordinated Multi-Objective Optimization for Multiple Trade-Offs in Pumped Outage Condition of Pumped Storage System

Zhao

Yang

et al. 2019

IEEE Access

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The transient process of pumped storage system (PSS) experienced pump mode, turbine mode and switching mode in pumped outage condition, spanning hump zone and S-shaped region. The conflicting dynamic indicators make it difficult to meet the requirements of the transient process. How to specify optimal operating strategies and improve the reliability of PSS in the pumped outage condition has become a key issue. This problem is addressed in this work based on coordinated multi-objective optimization, and three stages are included: nonlinear modeling, strategy optimization and decision making. A tradeoff is embodied in each stage. Firstly, the real-time accurate equivalent circuit model is applied for PSS. The spatiotemporal discrete analysis is presented to enable the trade-off between computing efficiency and model accuracy in stage 1. Then, the neighborhood-search chaotic mutation multi-objective gravitational search algorithm, integrating multiple constraints, is performed to solve the Pareto front. It achieves the trade-off between algorithm convergence and searching diversity in stage 2. Further, fuzzy analytic hierarchy process is innovatively introduced to select the most compatible solution, which comprehensively considers the quantitative and qualitative factors. It accomplishes the trade-off in conflicting objectives and indicators in stage 3. Compared with the on-site operation in pumped outage condition, the maximum reversing speed decreased from 545 rpm to 161.45 rpm, the maximum water pressure of volute can be reduced by 4.55%, and the minimum draft tube pressure can be improved by 6.94%. The coordinated multi-objective optimization provides a novel technical guidance for the safe and stable operation of PSS.

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“…Nonlinear modeling and dynamic analysis of hydraulic turbine governing systems has always been a topic of interest, and there has been much research in this area [11][12][13][14][15][16][17]. There is a consensus that fractional calculus is superior to integer calculus in describing systems with memory, historical dependence, and viscoelasticity [18][19][20][21][22][23][24][25][26][27][28][29].…”

Section: Introductionmentioning

confidence: 99%

Design of a Nonlinear Predictive Controller for a Fractional-Order Hydraulic Turbine Governing System with Mechanical Time Delay

et al. 2019

Self Cite

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A nonlinear predictive control method for a fractional-order hydraulic turbine governing system (HTGS) with a time delay is studied in this paper. First, a fractional-order model of a time-delay hydraulic turbine governing system is presented. Second, the fractional-order hydraulic servo subsystem is transformed into a standard controlled autoregressive moving average (CARMA) model according to the Grünwald-Letnikov (G-L) definition of fractional calculus. Third, based on the delayed Takagi-Sugeno fuzzy model, the fuzzy prediction model of the integer-order part of the HTGS is given. Then, by introducing a fourth-order Runge-Kutta algorithm, the fuzzy prediction model can be easily transformed into the CARMA model. Furthermore, a nonlinear predictive controller is proposed to stabilize the time-delay HTGS. Finally, the experiment results are consistent with the theoretical analysis.

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Modeling a pumped storage hydropower integrated to a hybrid power system with solar-wind power and its stability analysis

Cited by 183 publications

References 27 publications

An Optimal Wavelet Packets Basis Method for Cascade Hydro-PV-Pumped Storage Generation Systems to Smooth Photovoltaic Power Fluctuations

An Optimal Wavelet Packets Basis Method for Cascade Hydro-PV-Pumped Storage Generation Systems to Smooth Photovoltaic Power Fluctuations

Coordinated Multi-Objective Optimization for Multiple Trade-Offs in Pumped Outage Condition of Pumped Storage System

Design of a Nonlinear Predictive Controller for a Fractional-Order Hydraulic Turbine Governing System with Mechanical Time Delay

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