Hybrid Renewable Power Generation Systems Research Articles

Optimal design of solar PV-WT-SB based smart microgrid using NSHCSO

During the last decade, renewable technology based microgrid (MG) has attracted considerable attention as a higher efficiency and reliable resources of hybrid energy system (HES). In this work, wind turbine (WT), solar photovoltaic (PV) arrays and storage batteries (SB) are handled to make the HES which may be optimal with regards to multiple constraints including economic efficiency, reliability and environmental pollutants. The PV/WT/SB based HES of connected to utility network comforts the choice maker and can help mitigate the variability of the renewable energy resource. The Non-dominated Sorting-based Hybrid Cuckoo Search Optimization (NSHCSO) is exploited to create of the HES with takes account of different practical scenarios. A probabilistic based method has been used to carry out the test case with considering uncertainty related to solar radiation and wind speed variations. Additionally, sensitivity analysis has been implemented to investigate the significance of each parameter on the final optimal design. The results indicate that the developed optimization methodology is more efficient and reliable for the hybrid renewable power generation systems.

Bifurcation Analysis and Experimental Study of a Multi-Operating-Mode Photovoltaic-Battery Hybrid Power System

Stand-alone hybrid renewable power generation systems have gained popularity in recent years. However, due to the intermittent nature of the renewable resources, hybrid renewable power generation systems are often designed to operate with multiple structures and multiple operating modes. The design for stable operation of such systems requires consideration of the stability conditions for all possible structures and operating modes. A stand-alone photovoltaic-battery hybrid power system is studied for illustrating the possible complex behavior in this paper. We reveal smooth bifurcation, including slow-scale Neimark–Sacker bifurcation, fast-scale period-doubling bifurcation as well as coexisting bifurcation. Under certain conditions, when the system switches its operating mode, a nonsmooth bifurcation, manifested as a jump between stable and unstable behavior, can also be observed. Moreover, a detailed analysis based on a discrete-time mapping model is performed to evaluate the stability boundaries of the system. Extensive experiments verify the analysis and simulated results.

Optimal sizing of stand-alone photovoltaic/wind/hydrogen hybrid system supplying a desalination unit

The real penetration of renewable energy sources (RES) under varying weather conditions required an optimal sizing of hybrid renewable power generation systems. The present paper proposes a methodology based on iterative technique, to perform the optimal sizing of a stand-alone hybrid photovoltaic/wind/hydrogen system supplying a desalination unit which feeds the area’s inhabitants with fresh water. The methodology aims at finding the optimal technical–economic configuration among a set of systems components. Taking into account the models of the main hybrid system components and the hourly meteorological data and load profile for any site located worldwide, the recommended algorithm gives all possible configurations that can completely cover the fresh water requirements of isolated consumers. Afterward, the optimal configuration is predicted on the basis of the minimum initial investment cost. A case study is conducted to analyze a hybrid project, which is designed to supply a seawater desalination unit installed on the Kerkennah islands located in the south of Tunisia.

Design and energy control of stand-alone hybrid wind/photovoltaic/fuel cell power system supplying a desalination unit

Faced with increasing trend of water demand and decreasing resources of fossil fuels and their high costs, desalination units based on renewable energies have become the best solution to face this challenge. This paper aims to investigate the design and the operation strategy of stand-alone hybrid renewable power generation system supplying a desalination unit which feeds the Kerkennah islands (Tunisia) with fresh water. The sizing of all the main hybrid system components such as photovoltaic generator, wind turbine, a fuel cell, and an electrolyzer is investigated in order to obtain some technical and economic profitability. In order to ensure the optimal use of the produced energy and satisfy the fresh water needs, a novel power management algorithm that allows controlling the energy flows within the system components is developed. Simulation results were carried out over the two months of January and July, and its results are shown in our paper. These results demonstrate the feasibility and the efficiency of the used control strategy and the performance of the hybrid system.

Break-even analysis and optimization of a stand-alone hybrid system with battery storage for residential load consumption—A case study

To assure a real penetration of the enormous intermittent and dispersed naturally renewable resources especially solar and wind, optimal sizing of hybrid renewable power generation systems provide evidence to be indispensable. A determinist technique has been developed to optimize the annual capital cost and the levelized cost of energy of a stand-alone hybrid generation system. Generation and storage units for three systems (wind, photovoltaic, and hybrid photovoltaic–wind turbine) are optimally sized in order to meet the annual load and minimize the capital annualized cost. A case study is conducted to analyze one hybrid project, which is designed to supply residential household located in Monastir city, Tunisia.

Determination of Energy Storage Capacity for a Hybrid Renewable Power Generation System

Using renewable resources, such as solar and wind energy for generation presents technical challenges in producing continuous and controllable power. Since it is difficult to predict and control the output of the renewable resources, an extra Energy Storage System (ESS) is needed to enable a proper management of the uncertain power production. The ESS acts like an energy buffer such that the renewable output power can be regulated to suit the operational requirements of the network. To reduce the capital investment for the storage devices, it is important to estimate reasonable storage capacities. This report proposes an integration of solar and wind energy to form a hybrid power generation system. The goal is to reduce the capacity of the ESS so as to maximize the economic benefit that can be obtained from energy captured from the hybrid renewable sources. In the project, the studied hybrid solar-wind power system is compared with a solar power system and a wind power system. Results show that the proposed hybrid scheme is feasible to reduce the ESS capacity, by taking advantage of the complementary nature of solar vs. wind generation.

Modeling, control, and simulation of battery storage photovoltaic-wave energy hybrid renewable power generation systems for island electrification in Malaysia.

Today, the whole world faces a great challenge to overcome the environmental problems related to global energy production. Most of the islands throughout the world depend on fossil fuel importation with respect to energy production. Recent development and research on green energy sources can assure sustainable power supply for the islands. But unpredictable nature and high dependency on weather conditions are the main limitations of renewable energy sources. To overcome this drawback, different renewable sources and converters need to be integrated with each other. This paper proposes a standalone hybrid photovoltaic- (PV-) wave energy conversion system with energy storage. In the proposed hybrid system, control of the bidirectional buck-boost DC-DC converter (BBDC) is used to maintain the constant dc-link voltage. It also accumulates the excess hybrid power in the battery bank and supplies this power to the system load during the shortage of hybrid power. A three-phase complex vector control scheme voltage source inverter (VSI) is used to control the load side voltage in terms of the frequency and voltage amplitude. Based on the simulation results obtained from Matlab/Simulink, it has been found that the overall hybrid framework is capable of working under the variable weather and load conditions.

Performance investigation of a hybrid renewable power generation and storage system using systemic power management models

Hybrid renewable power generation systems considering storage of energy and/or hydrogen involve considerable complexity as heterogeneous equipment need to be interconnected and activated or deactivated at different time instances. This work employs generic and flexible decision making models to develop complex power/hydrogen management strategies and investigate their performance on systems integrating multiple power generation and storage devices. These models significantly facilitate the analysis of both a standalone power generation and storage system forming a microgrid currently in operation as well as three interconnected microgrids of different functionalities considered in this work. These systems are used to investigate the performance of a large number of power management strategies developed using the proposed models.

SMOOTH AND NONSMOOTH BIFURCATIONS IN MULTI-STRUCTURE MULTI-OPERATING-MODE HYBRID POWER SYSTEMS

Hybrid renewable power generation systems have been developed rapidly in recent years. Due to the inherent fluctuation of availability of energy from renewable sources, systems that are designed to capture energy from such sources and deliver it in loads have to cope with the difficult challenges of maintaining stability under all possible operating conditions. As a result, the structures and operating modes of such hybrid systems are inherently time-varying. Due to their multiple structures and operating-modes, hybrid systems have rather complex dynamic behavior and the design for stable operation requires thorough consideration of the effects of variation in parameters on the operating modes and corresponding stability statuses. This paper presents a formal system description for such systems and a general procedure for analyzing the change of dynamical behavior under parameter variations (i.e. bifurcation) of this kind of systems. A hybrid power system consisting of dual-input buck converters is taken as an example for illustrating the possible complex behavior. We reveal smooth and nonsmooth bifurcation phenomena in this system. Under certain conditions, nonsmooth bifurcations have been observed and verified with full-circuit simulations. Moreover, a detailed analysis based on an averaged model is performed to identify two specific types of bifurcation and evaluate the stability boundaries of the system.

Frequency deviation control by coordination control of FC and double-layer capacitor in an autonomous hybrid renewable energy power generation system

In this paper, a novel control strategy for frequency control in stand-alone application based on coordination control of fuel cells (FCs) and double-layer capacitor (DLC) bank in an autonomous hybrid renewable energy power generation system is implemented. The proposed renewable energy power generation subsystems include wind turbine generator (WTG), photovoltaic system (PV), FC system and DLC bank as energy storage system. The system performance under different condition has been verified by using real weather data. Simulation results demonstrate the validity of proposed studied hybrid power generation system feeding isolated loads in power frequency balance condition.

A Comprehesnive Dynamic Modeling of Grid Connected Hybrid Renewable Power Generation and Storage System

A Comprehesnive Dynamic Modeling of Grid Connected Hybrid Renewable Power Generation and Storage System

Sizing optimization of grid-independent hybrid photovoltaic/wind power generation system

To allow a real penetration of the huge dispersed naturally renewable resources (wind, sun, etc.) intermittent and more or less easily predictable, optimal sizing of hybrid renewable power generation systems prove to be essential. This paper recommends an optimal sizing model based on iterative technique, to optimize the capacity sizes of different components of hybrid photovoltaic/wind power generation system using a battery bank. The recommended model takes into account the submodels of the hybrid system, the Deficiency of Power Supply Probability (DPSP) and the Levelised Unit Electricity Cost (LUEC). The flow chart of the hybrid optimal sizing model is also illustrated. With this incorporated model, the sizing optimization of grid-independent hybrid PV/wind power generation system can be accomplished technically and economically according to the system reliability requirements. A case study is conducted to analyze one hybrid project, which is designed to supply residential household located in the area of the CDER (Center for Renewable Energy Development) situated in Bouzareah, Algeria (36° 48′N, 3° 1′E, 345 m).