Control, energy management and performance evaluation of desalination unit based renewable energies using a graphical user interface

Abbes

Int Trans Electr Energ Syst

et al. 2019

Summary This paper was focused on the implementation of experimental test bench for a wind power generator (WPG) connected to the electrical network. The objectives of this work are to validate the test bench functionality and to investigate in real time a high‐order sliding‐mode control (SMC) scheme applied to control the WPG. This study has three main purposes. The first one is the development of the SMC technique to ensure a control method insensitive against nonlinear behavior of wind systems. The second one is the experimental implementation of this SMC scheme. The third one is a synchronization technique that has been presented in a grid‐connected power inverter to adapt the WPG voltage to the grid voltage. A comparative study between the experimental and simulation results demonstrates the functionality of the test platform and the robustness of the SMC in real time.

“…As depicted in Figure part “PMSG control,” the reference currents of the vector control scheme applied to the PMSG are determined as follows:

({, \begin{array}{l} {i_{italicsd}}^{*} = 0 \\ {i_{italicsq}}^{*} = \frac{T_{em_PMSG_ref}}{p ψ_{m}} \end{array}) .

\begin{matrix} lefttrue \\ T_{em_PMSG_ref} = k_{italicopt} {normalΩ}_{m}^{2} \\ k_{italicopt} = \frac{ρπ R^{5} C_{p - max}}{2 λ_{italicopt}^{3}} \end{matrix} .

λ opt represents the optimum value of the speed ratio corresponding to the maximum of the power coefficient ( C p‐max ).…”

Section: Experimental Platform Controlmentioning

confidence: 99%

“…Then, the reverse park transformation is defined by the following matrix: As depicted in Figure 2 part "PMSG control," the reference currents of the vector control scheme applied to the PMSG are determined as follows 21 :…”

Section: Control Of the Pmsgmentioning

confidence: 99%

A second‐order sliding‐mode control for a real time emulator of a wind power system synchronized with electrical network

Abbes

Int Trans Electr Energ Syst

et al. 2019

“…These systems have higher renewable energy penetration and lower water production costs with respect to the fully autonomous desalination plants [28]. However, new dedicated and complex management systems are needed in order to improve the system stability [35]. In fact, as RES power fluctuations produce modifications of the load curve shape, causing sudden load power drops, diesel generators constrain RES utilization, being unable to lower their output below the minimum load settings predetermined to ensure engine efficiency and preserve engine condition.…”

Section: Introductionmentioning

confidence: 99%

Sea-Water Desalination for Load Levelling of Gen-Sets in Small Off-Grid Islands

Corsini

Tortora

2018

Energies

This study deals with the energy/water nexus on small off-grid islands. Small islands share several characteristics that hinder the introduction of new plants, such as: Energy system balance when renewable sources are introduced; water shortages, usually addressed via shipping from the mainland; environmental and historical heritage values; and, scarce land availability. In these cases, it is mandatory to detect energy/water technology integration and management solutions respecting the peculiarities and boundaries of the sites. The present work proposes a desalination plant with a primary scope of load leveler and a secondary scope of water producer. The aim is to propose a simple and non-invasive solution for energy/water management in order to limit impacts on the local environment while improving the match between renewable energy and local generation by means of desalination. This study led to an integrated system composed of local diesel engine power plant, distributed roof-top photovoltaic plants and a desalination plant, managed by a dedicated control logic. Desalination from renewable energy and power adjustments of already active diesel engines are favored. The case study refers to Ponza island, in the Tyrrhenian Sea. This paper demonstrates the effective possibility of using a desalination plant with the double purpose of water production and load levelling, providing 98% of the local water demand while mitigating the renewable energy fluctuations effects on the gen-set. Moreover, the proposed system results in a 50% CO2eq emissions abatement over the current water supply carbon footprint.

“…Theoretically, it is limited to 0.59, which means that it is possible to extract a maximum of 59% of the kinetic energy in the wind. In practice, it does not exceed 0.49 for the best wind turbine [16].…”

Section:   21mentioning

confidence: 99%

Control and management Strategy of a Generation System Made By Variable - Speed Wind Turbine and Super - Capacitor Energy Storage System for Stand alone Applications

Krim¹,

Krim²,

Mimouni³

2017

ijeei

This paper deals with the problems of intermittency of primary source of wind energy and the external disturbances. Subsequently, a power management and a robust control of a standalone energy production unit are presented. This production unit comprising a variable speed wind turbine coupled to a Permanent Magnet Synchronous Generator (PMSG) and a module of Super-Capacitors (SC) that is considered as an Energy Storage System (ESS). This unit feeds a three-phase load by means of an inverter and an RLC filter. In order to assure a control strategy which has a very good performance despite the high nonlinearity of wind systems and an intermittence form of wind power, a second-order sliding mode control based on a super-twisting algorithm is applied to a PMSG. Then, a power management strategy is applied to the SC using a buck-boost converter according to load instructions and wind speed fluctuations. The response of the power algorithm enables to ensure the power flow exchange between the production unit and the power consumers and to protect the ESS against overcharge and excess discharge to ensure safe operation. Finally, using PI controllers, the inverter adjusts the capacitors voltages and currents at the output of the RLC filter with the nominal frequency and voltage. The simulation results show the robustness of the implanted control strategy.