Modeling and control of a small hydro-power plant for a DC microgrid

Gil-González, Walter; Montoya, Oscar Danilo

doi:10.1016/j.epsr.2019.106104

Cited by 29 publications

(14 citation statements)

References 27 publications

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“…In the case of optimization, multiple approaches based on semidefinite programming [4], second-order cone programming [20], sequential quadratics [22] and metaheuristics have been proposed to address optimal power flow problems [23]; additionally, some classical numerical methods can be found, such as Newton-Raphson [24], Gauss-Seidel [17] or successive approximations for power flow solutions [25]. In the case of control, the most conventional approaches focus on battery control [26], renewable energy integration [27] and dynamic stability based on passivity based-control [28,29], model predictive control [30,31] and sliding mode control [32,33].…”

Section: Introductionmentioning

confidence: 99%

Optimal Location and Sizing of PV Sources in DC Networks for Minimizing Greenhouse Emissions in Diesel Generators

et al. 2020

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This paper addresses the problem of the optimal location and sizing of photovoltaic (PV) sources in direct current (DC) electrical networks considering time-varying load and renewable generation curves. To represent this problem, a mixed-integer nonlinear programming (MINLP) model is developed. The main idea of including PV sources in the DC grid is minimizing the total greenhouse emissions produced by diesel generators in isolated areas. An artificial neural network is employed for short-term forecasting to deal with uncertainties in the PV power generation. The general algebraic modeling system (GAMS) package is employed to solve the MINLP model by using the CONOPT solver that works with mixed and integer variables. Numerical results demonstrate important reductions of harmful gas emissions to the atmosphere when PV sources are optimally integrated (size and location) to the DC grid.

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Section: Introductionmentioning

confidence: 99%

Optimal Location and Sizing of PV Sources in DC Networks for Minimizing Greenhouse Emissions in Diesel Generators

et al. 2020

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“…Most of the distributed energy resources (DERs) include solar PV, fuel cells, or batteries, which generate DC power, together with many loads such as fans, heating, lighting systems, and even power electronics systems, which operate on direct current. As a consequence, DC MGs [28,[37][38][39][40] have been proposed to avoid waste in the DC/AC conversion stage, since this means a loss of between 5% and 15% of the total energy generated [30]. However, it is worth noting that the promising applications of DC MGs have been limited by the shortage of household DC loads, which has boosted the appearance of AC/DC hybrid MGs with applications such as data centers or maritime and remote MGs [39,[41][42][43][44][45].…”

Section: Power Electronicsmentioning

confidence: 99%

Towards Optimal Management in Microgrids: An Overview

et al. 2021

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A microgrid is a set of decentralized loads and electricity sources, mainly renewable. It can operate connected to and synchronized with a traditional wide-area synchronous grid, i.e., a macrogrid, but can also be disconnected to operate in “island mode” or “isolated mode”. When this microgrid is able to manage its own resources and loads through the use of smart meters, smart appliances, control systems, and the like, it is referred to as a smart grid. Therefore, the management and the distribution of the energy inside the microgrid is an important issue, especially when operating in isolated mode. This work presents an overview of the different solutions that have been tested during the last few years to manage microgrids. The review shows the variety of mature and tested solutions for managing microgrids with different configurations and under several approaches.

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“…To keep hydropower plants operating at their nominal values, several approaches are reported in the specialized literature, some of which consider the use of mechanical energy storage systems through flywheels [28], interconnected systems [29], storage of electrical energy [30] and use of micro-grids [31,32]. Other methods consider the use of asynchronous generators [33] and isolated micro-grids [34].…”

Section: Review Of the State Of The Artmentioning

confidence: 99%

Combined Method of Flow-Reduced Dump Load for Frequency Control of an Autonomous Micro-Hydropower in AC Microgrids

et al. 2021

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Nowadays, microgrids (MGs) play a crucial role in modern power systems due to possibility of integrating renewable energies into grid-connected or islanded power systems. The Load Frequency Control (LFC) is an issue of paramount importance to ensure MGs reliable and safe operation. Specifically, in AC MGs, primary frequency control of each energy source can be guaranteed in order to integrate other energy sources. This paper proposes a micro-hydro frequency control scheme, combining the control of a reduced dump load and the nozzle flow control of Pelton turbines operating in autonomous regime. Some works have reported the integration of dump load and flow control methods, but they did not reduce the dump load value and adjust the nozzle flow linearly to the power value demanded by users, causing the inefficient use of water. Simulation results were obtained in Matlab®/Simulink® using models obtained from previous research and proven by means of experimental studies. The simulation of the proposed scheme shows that the frequency control in this plant is done in correspondence with the Cuban NC62-04 norm of power energy quality. In addition, it is possible to increase energy efficiency by reducing the value of the resistive dump load by up to 7.5% in a case study. The validation result shows a 60% reduction of overshoot and settling time of frequency temporal behavior of the autonomous micro-hydro.

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Modeling and control of a small hydro-power plant for a DC microgrid

Cited by 29 publications

References 27 publications

Optimal Location and Sizing of PV Sources in DC Networks for Minimizing Greenhouse Emissions in Diesel Generators

Optimal Location and Sizing of PV Sources in DC Networks for Minimizing Greenhouse Emissions in Diesel Generators

Towards Optimal Management in Microgrids: An Overview

Combined Method of Flow-Reduced Dump Load for Frequency Control of an Autonomous Micro-Hydropower in AC Microgrids

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