Reduced converter topology for integrated wind and small‐hydro energy generation system

In this study, the authors propose a novel non‐linear mathematical model of a hydro‐energy generation system in the load rejection transient considering the elastic water hammer‐impact of the penstock and the non‐linear characteristics of the generator. More specifically, six dynamic transfer coefficients of the hydro‐turbine are introduced to the generation system. Furthermore, the dynamic behaviours of the system are investigated using bifurcation diagrams and time waveforms from the point of engineering. Finally, these methods and analytical results will supply some principles for designing and running a hydropower station.

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“…To acquire α , we utilise the curve of the closing law of the guide vane in the load rejection transient, as shows in Fig. 2 [4, 12, 13, 25–29].…”

Section: Non‐linear Dynamic Mathematical Model Of the Hegsmentioning

confidence: 99%

Dynamic analysis and modelling of a Francis hydro‐energy generation system in the load rejection transient

Chen

Zhang

et al. 2016

IET Renewable Power Generation

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“…An integrated small hydro and wind energy generation system with reduced number of converters have been reported in [18].…”

Section: Introductionmentioning

confidence: 99%

“…A solar air cooler system using standalone PMBLDCM with improved efficiency has been presented in [22]. As per the survey of literature presented in [1–22], the small hydro driven air conditioning systems for remote locations, have not been explored yet. The BLDC motor drives are widely used in various applications such that electrical vehicles, air conditioners, fans, solar water pumping systems and automation systems [23].…”

Section: Introductionmentioning

confidence: 99%

Micro‐hydro generator fed frequency adaptive sliding mode controlled air conditioning system for remote and hilly areas

Kalla

Rathore

Bhati

et al. 2021

IET Renewable Power Gen

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This paper presents a micro-hydro generator driven frequency adaptive sliding mode (FASM) control-based improved power quality permanent magnet brushless DC motor (PMBLDCM) driven air conditioning system for remote and hilly areas. In such locations, the grid availability is poor or limited. The self-excited asynchronous generator (SEAG) is highly suitable for micro-hydro power generation. The voltage and frequency regulations of SEAG systems are very poor. Therefore, an improved power quality FASM control of a new zeta function based modified CSC (ZFM-CSC) converter scheme is developed to drive the micro-hydro power driven SEAG fed air conditioning system. The conventional air-conditioning schemes are suitable for the grid fed system, where the frequency and voltage remain constant. However, these conventional control schemes are not suitable for a standalone SEAG based micro-hydro generator driven air conditioners since the frequency and voltage of this system vary frequently at different loadings and dynamic operating conditions. This leads to an incorrect estimation of reference source current in a conventional system, which in turn affects the system stability. The sudden change of loads in a conventional air conditioning system may de-magnetize and de-stabilize the micro-hydro driven SEAG. The experimental and simulated results presented validate the robustness of this system.This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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“…With the increasing proportion of hydropower installed capacity in the power system, the interaction effects between hydropower station and the power grid become more and more complex [1][2][3][4][5]. The stability of the power grid is closely related to the operation of the hydropower station, which is a non-linear, non-stationary, and time-variant system [6][7][8][9][10]. The dynamic quality of the hydroturbine generator unit (HTGU) transient process is an important factor affecting the stability of the hydropower station [11,12].…”

Section: Introductionmentioning

confidence: 99%

Grid‐connection analysis of hydro‐turbine generator unit with stochastic disturbance

Liu

Chen

et al. 2019

IET Renewable Power Generation

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Here, the authors bring attention to the stability of the hydro-turbine generator unit (HTGU) with stochastic disturbance during the grid-connection process. First, the stochastic factor of the water head is innovatively introduced to the hydro-turbine governing system (HTGS) during the start-up process of the HTGU. Then, the dynamic characteristics of the startup and grid-connection process are studied under different stochastic intensities and different values of three system parameters by two different methods, in detail. The results show that the stability of grid-connection is affected obviously by the various intensities of stochastic water head, and there are some interesting phenomena and significant laws. Meanwhile, the values of the HTGS parameters show certain effect on the resistance of HTGS to the stochastic disturbance. Finally, this study can provide a theoretical basis for improving the probability of success in combining the HTGU to the grid in practical process.

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Reduced converter topology for integrated wind and small‐hydro energy generation system

Cited by 15 publications

References 15 publications

Dynamic analysis and modelling of a Francis hydro‐energy generation system in the load rejection transient

Dynamic analysis and modelling of a Francis hydro‐energy generation system in the load rejection transient

Micro‐hydro generator fed frequency adaptive sliding mode controlled air conditioning system for remote and hilly areas

Grid‐connection analysis of hydro‐turbine generator unit with stochastic disturbance

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