Governor Design for a Hydropower Plant with an Upstream Surge Tank by GA-Based Fuzzy Reduced-Order Sliding Mode

Xu, Chunxiao; Qian, Dianwei

doi:10.3390/en81212376

Cited by 20 publications

(9 citation statements)

References 26 publications

(36 reference statements)

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“…Accordingly, the modified formulas of water head for compensating error are proposed in RAECM. If the correction node is on the right side of the unit pipe, the correcting formula is given by Equation 14; otherwise, it is as given by Equation (15). Here, H R and H L are the corrected water head of the monitoring node in jth section unit pipe.…”

Section: Discrete Analysis Of Variable Space-stepmentioning

confidence: 99%

A Real-Time Accurate Model and Its Predictive Fuzzy PID Controller for Pumped Storage Unit via Error Compensation

et al. 2017

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Model simulation and control of pumped storage unit (PSU) are essential to improve the dynamic quality of power station. Only under the premise of the PSU models reflecting the actual transient process, the novel control method can be properly applied in the engineering. The contributions of this paper are that (1) a real-time accurate equivalent circuit model (RAECM) of PSU via error compensation is proposed to reconcile the conflict between real-time online simulation and accuracy under various operating conditions, and (2) an adaptive predicted fuzzy PID controller (APFPID) based on RAECM is put forward to overcome the instability of conventional control under no-load conditions with low water head. Respectively, all hydraulic factors in pipeline system are fully considered based on equivalent lumped-circuits theorem. The pretreatment, which consists of improved Suter-transformation and BP neural network, and online simulation method featured by two iterative loops are synthetically proposed to improve the solving accuracy of the pump-turbine. Moreover, the modified formulas for compensating error are derived with variable-spatial discretization to improve the accuracy of the real-time simulation further. The implicit RadauIIA method is verified to be more suitable for PSUGS owing to wider stable domain. Then, APFPID controller is constructed based on the integration of fuzzy PID and the model predictive control. Rolling prediction by RAECM is proposed to replace rolling optimization with its computational speed guaranteed. Finally, the simulation and on-site measurements are compared to prove trustworthy of RAECM under various running conditions. Comparative experiments also indicate that APFPID controller outperforms other controllers in most cases, especially low water head conditions. Satisfying results of RAECM have been achieved in engineering and it provides a novel model reference for PSUGS.

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Section: Discrete Analysis Of Variable Space-stepmentioning

confidence: 99%

A Real-Time Accurate Model and Its Predictive Fuzzy PID Controller for Pumped Storage Unit via Error Compensation

et al. 2017

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“…I, which allows high efficiency due to the opportunity of variable speed operation. This system has a strong coupling between mechanical, hydraulic, and electrical dynamics which makes the system difficult to analyze [1], [2]. Moreover, it presents many different operating points, which also complicate the analysis [3].…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, it is challenging to guarantee the stability for all operating points since linear models oversimplify the system dynamics. In the case of state feedback controllers, several controllers have been proposed such as nonlinear control [9], [10], intelligent control [8], sliding mode control [2], [11], fuzzy control [12]- [14], fault-tolerant control [15], predictive control [7], [16], synergetic control [17] and finitetime control [18]. However, these controls are observed to be difficult to implement and require tuning of many parameters and perform an on-line optimization process [18].…”

Section: Introductionmentioning

confidence: 99%

Passivity-Based Control for Small Hydro-Power Generation With PMSG and VSC

2020

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This paper presents a passivity-based control method for a small hydro-power system that consists of a permanent magnet synchronous generator (PSMG) connected to the grid through a back-toback converter. Nonlinear models of the hydraulic, mechanical, and electrical parts of the small hydro-power system are considered. Two approaches in the realm of passivity-based control are implemented, namely, standard passivity-based control and PI-passive. These controls consider the intrinsic characteristics of the model, which has a port-Hamiltonian (pH) structure with a small hydro-power system in open-loop. The purpose is to design a control law with passive output which ensures asymptotic stability for closed-loop operation in the sense of Lyapunov's theory. The paper is practically oriented, and hence, the proposed controllers are tested and compared with a conventional approach, in a 13.2 kV distribution feeder. The proposed controllers have been assessed and compared with a classical PI controller considering steady state and transient behaviors in small hydro-power plants (SHPs). Simulation results show that the proposed methodology guarantees stability and offers better dynamical performance. INDEX TERMS Small hydro-power, permanent magnet synchronous generation (PMSG), energy conversion power systems, passivity, back-to-back converter.

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“…At present, the control method commonly used in water turbine control system mainly includes the following: nonlinear control [4][5][6][7], sliding mode control [8][9][10], PID control [11][12][13], fuzzy control [14], fault tolerant control [15], predictive control [16,17], and finite-time control [18]. These control methods have important theoretical and practical significance for the control of hydraulic turbine governing system, but they also have their own defects.…”

Section: Introductionmentioning

confidence: 99%

Fixed-Time Stability of the Hydraulic Turbine Governing System

Liu

Zhang

et al. 2018

Mathematical Problems in Engineering

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This paper studies the problem of fixed-time stability of hydraulic turbine governing system with the elastic water hammer nonlinear model. To control and improve the quality of hydraulic turbine governing system, a new fixed-time control strategy is proposed, which can stabilize the water turbine governing system within a fixed time. Compared with the finite-time control strategy where the convergence rate depends on the initial state, the settling time of the fixed-time control scheme can be adjusted to the required value regardless of the initial conditions. Finally, we numerically show that the fixed-time control is more effective than and superior to the finite-time control.

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Governor Design for a Hydropower Plant with an Upstream Surge Tank by GA-Based Fuzzy Reduced-Order Sliding Mode

Cited by 20 publications

References 26 publications

A Real-Time Accurate Model and Its Predictive Fuzzy PID Controller for Pumped Storage Unit via Error Compensation

A Real-Time Accurate Model and Its Predictive Fuzzy PID Controller for Pumped Storage Unit via Error Compensation

Passivity-Based Control for Small Hydro-Power Generation With PMSG and VSC

Fixed-Time Stability of the Hydraulic Turbine Governing System

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