Scalable Solutions for Wind and Solar Distributed Generation

The imminent exhaustion of fossil energy resources and the increasing demand for energy were the motives for those reasonable in world to put into practice an energy policy based on rational use of energy; and on exploitation of new and renewable energy sources. After 1980, as the supply of conventional energy has not been able to follow the tremendous increase of the production demand in rural areas of the world, a renewed interest for the application of solar and wind energy has shown in many places. Therefore, the researchers and engineers began to pay more attention to wind and solar energy utilisation in rural areas. Because the wind energy resource in many rural areas is sufficient for attractive application of wind pumps, and as fuel is insufficient, the wind pumps will be spread on a rather large-scale in the near future. Wind is a form of renewable energy, which is always in a non-steady state due to the wide temporal and spatial variations of wind velocity. The need for the provision of new data stations in order to enable a complete and reliable assessment of the overall wind power potential of the country is to be identified and specific locations suggested. This article presents the background and ideas of the development of the concept as well as the main results and experience gained during ongoing projects up to now. In the world, various designs of wind machines for water pumping have been developed and some designs are presently manufactured commercially. Results suggest that wind power would be more profitably used for local and small-scale applications especially for remote rural areas. It is concluded that many parts of the world is enjoyed with abundant wind and solar energy resources.

Renewable energy sources like wind and solar energies can be combined to increase the total power generation and thereby increase the efficiency of the system. The combination also provides a means to overcome the intermittent nature of the solar and wind renewable energy sources, since one source can be used for power generation when the other is not available. AC-DC converters are used to convert the alternating voltage of the wind generator to a constant DC value which can be used to charge the batteries or later converted to AC voltage to drive AC loads. A Maximum Power Point Tracking (MPPT) system using a boost converter is designed to extract maximum possible power from the sun when it is available. This method provides better harmonic reduction since Harmonic content is detrimental for the generator lifespan, heating issues, and efficiency. Simulations are carried out in PSIM software and MATLAB.' Keywords: Boost converter, hybrid system, MATLAB, MPPT, PSIM software, renewable energy

With high economic growth, Vietnam is now witnessing an increasing energy demand, having much potential for renewable sources such as wind energy, solar energy or biomass energy. The nation is heavily dependent on fossil energy sources such as coal and oil. This situation raises concerns about both energy security and the environment. Therefore, a question arises if Vietnam can develop renewable energy to solve energy demand, energy security and reduce climate change impacts as committed. This article analyses a considerable potential for renewable energy sources (especially wind and solar energy). The analysis also indicates competitiveness between these renewable energy sources compared to the traditional energy sources that Vietnam is dependent on, especially when there are policies to encourage the development of renewable energy and limit emissions. This article proposes some recommendations to develop renewable energy sources, with an overview of replacing fossil energy in Vietnam.

There have been many discussions in Lithuania about a strategy for reducing the impact of climate change. Members of the international community agree that reducing greenhouse gas emissions to the atmosphere is necessary to avoid dangerous climate change. The main greenhouse gas emissions from human activity are carbon dioxide. Carbon dioxide is mainly produced by combustion of fossil fuels, which are currently used: natural gas, coal, oil, peat, etc. Fossil fuels are still the main source of energy. The amount of energy produced and consumption from renewable energy sources (RES) is increasing both in Lithuania and in Europe. According to the Directive (2009/28/EU) Lithuania has a legally binding target in the year 2020. The share of renewable energy would account for at least 23% of the total final energy consumption of the country. The share of renewable energy would account for at least 10% of the final energy consumption in the transport sector. Lithuania achieved its target and this indicator was 23.9% in 2014. According to the Eurostat data, the share of RES produced from renewable energy sources in the total energy balance is increasing annually. In 2007 this indicator was only 4.7% and it has grown 4 times in 2016. The production of electricity from renewable energy sources satisfied the country’s energy demand by 18.9% in Lithuania. This is the best index so far. Wind energy is the most popular type of green energy, which has been growing at a rate of 5 times in this period. Promotion of the use of renewable resources is provided in the Republic of Lithuania Law on Renewable Energy and the long-term development of the use of renewable resources is provided for in the National Energy Strategy. At this moment Lithuania is a fuel importing country, but in the future Lithuania should produce about 70% of electricity itself. It is forecasted that in 2020 electricity generation in the country should make up 35% of the demand, in 2030 it should be 70%, and in 2050 it should reach 100%. From renewables we should receive a large, almost 80% share of energy. And gas will be a transitional fuel by 2050. The project of strategy states that energy from renewable sources will become a major component of all sectors: electricity, heat, cooling and transport. The objective is to achieve a 30% share of renewables in the final energy consumption balance in 2020, 45% in 2030, and 80% in 2050. The renewables should produce all heat energy and the share of green energy in transport should reach 50% at the end of 2050. The article focuses on the use of the potential of renewable energy sources from agricultural raw materials and their waste. The surplus of agricultural production makes it necessary to look for opportunities to reduce environmental pollution. The aim of the article is to assess the use of potential of renewable energy sources in Lithuania. The results of the analysis showed that increasing energy production is possible not only using wind, solar, water or geothermal energy, but by processing traditional agricultural and animal products and their waste: straw, grain crops, livestock or bird’s excrement, etc. It is recommended to look at the unconventional potential of raw materials, such as sewage sludge, spirits, molasses, etc. The use of biomass has potentially revealed alternatives to biofuels that underpin the use of different generations of biofuels. The use of biofuels in the long term should contribute to the slowdown in climate change.

Solar energy is an inexhaustible and pollution-free energy source that plays a significant role in the sustainable provision of energy services. The main purpose of this study is to examine the potential, current situation, future strategies, and policies of solar energy, which is a renewable resource in Azerbaijan. This study is research in which qualitative methods are used and within the scope of the study, literature review, systematic approach and inductive methods were used. In the study, Azerbaijan's policy towards solar energy has been examined based on the potential sources of solar energy, the current situation and the country's future strategies. Azerbaijan is slightly behind in the production of electricity from renewable energy sources. Along with all this, the most important strategic goals for the use of renewable and alternative energy sources in Azerbaijan have been defined. Thus, by 2030, the share of renewable energy investment in the country's total energy balance to 30% has been determined as the main goal. As a result of the study, it can be said that solar energy policies will have a positive effect on the country's economy in the coming years, since Azerbaijan has a geographical location and an infrastructure system that can be delivered to the countries in need.

Introduction: To date, a variety of studies have been published on the topic of long term energy system transition. Most studies on future energy systems, however, have a shorter time frame or adopt a supranational focus (e.g. the Energy Roadmap, 2011 or the World Energy Outlook, 2015). It then constitutes a sincere challenge to perform a national energy system transition study with as time horizon 2050 and covering a far-reaching transformation of the energy system. VITO, together with the FPB (Federal Planning Bureau) and ICEDD, performed a study to scrutinise the transition of the Belgian national energy system towards a future mix entirely based on renewable energy sources. The focus on renewable energy sources and on building a national energy system completely running on renewable energy can be traced back to three main concerns: – Climate change: Renewable energy sources (RES) are a major instrument in the fight against climate change as RES do not release (net) greenhouse gas emissions. – Security...

“Smart Grid” is a modern concept which refers to the conversion of the mainstream or typical electric power grid to a modern power grid. This new conversion is a foreseeable solution to the power system problems of the modern century. Rejuvenation of the current electric power distribution system is an important step to implement the Smart Grid technology. So, distribution system engineers should be acquainted with the knowledge of Smart Distribution System. Also the customers should acknowledge the benefits that they will be enjoying from this modernized power system. There are power crisis everywhere in the world, besides there is system loss in the existing power system. It is happening in Bangladesh also. To reduce power crisis renewable source of energy like solar energy, wind energy, raw coal energy may be used. But the quantity of electricity produced by this renewable energy source is low and several kilowatts range. This electricity is utilized by smart grid which is hard for usual power grid system. For this reason we need hybrid ac/dc smart control grid system. In this report models using Wind-mil Software is proposed for reducing system loss and also incorporate smart metering so that the power flow can reach easily to the consumers. Smart grid also helps sole proprietor and individual business man to sell their little amount of electricity to the grid which they produce by their own entrepreneurship through smart meter. Line loss and regulated voltage, regulator and capacitor are also inserted here to reduce the loss and make the effective and efficient power supply to the consumer. This metering is also centrally controlled and works over a huge area. At present developing country should develop this system.

Over the last few years, the electricity sector has become increasingly dependent on renewable energy sources (RES]. Green energy has recently become a top priority for experts in order to meet rising electricity demand. As a result, environmental organisations have promoted the utilization of RES like solar, wind and tidal energy as an alternative to fossil fuels for electricity generation. Due to current research and development in power electronics, wind and solar energy, in particular, have been reported to be more practical in large-scale deployment. In this paper, an efficient hybrid renewable energy system integrating solar and wind energy is proposed which utilizes a modified Sheppard Taylor converter. The converter performs regulation of output voltage under varying load and input voltage with negligible input current ripple. A fuzzy-PSO approach is exploited for the efficient tracking of maximum power to obtain optimized results with rapid speed of convergence and the PWM pulses generated provide optimal duty cycle to the converter switch. A grid connected <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$3\varphi$</tex> VSI along with LC filter modelled by dq theory is utilized which converts the stationary abc axis into dq axis that rotates synchronously. The entire system is realized by MATLAB/SIMULINK and the efficient outputs are obtained with reduced THO of 0.86%.

This research provides an overview of Iraq's renewable energy prospects. One of the most important sorts of renewable energy resources in the world is wind energy. Wind energy is considered environmentally beneficial and very economical. These benefits are cited as the primary reasons for using wind turbines to generate power across the world. An assessment of the country's profile has been made, taking into consideration existing energy generation, crude oil production at current levels, gas flares that generate CO2 emissions, as well as industry, human activities, and grid electricity distribution. Iraq has power shortages, and several obstacles must be solved in order to satisfy projected increases in electrical demand. This analysis discovered that solar, wind, and biomass energy are now underutilized, but that they might play a key part in Iraq's sustainable energy future. Wind energy, for example, has become an important aspect in reducing pollution and improving air quality. The usage of tiny wind turbines to generate power under Iraqi meteorological conditions is examined in this study. The research evaluates the wind system that is necessary to provide electric power for highway services including lighting and parking. According to the study's findings, wind turbines can be used effectively for roadway illumination. The efficiency of a maximum wind turbine is determined by the blade design. For the planned use, the wind speed reported in Iraqi winter is pretty acceptable. Alternative and sustainable energy, wind energy, Iraqi climate are all index terms. The Iraqi government recently joined the Paris Climate Agreement and is now starting to encourage the participation of small and large consumers to generate electricity from renewable energy sources. This article analyzes the hybrid electrical system of solar and wind energy for the city of Dohuk, the northern part of Iraq, to find out the feasibility of this system compared to the local electrical network. First, access to solar and wind energy resources in Dohuk were ensured.

The paper aims at determining the role played by funds from the European Union in the development of renewable energy sources in Poland in the context of European Union cohesion policy. We have derived data from the official European Funds Portal for the size of projects and the financial support obtained from the European Union for the use of a specific renewable energy source. We have analyzed all (928) projects related to hydro- and geothermal energy, biomass (together with biogas), wind, and solar energy implemented in all 16 voivodships (administrative regions of the second order, NUTS 2). It must be mentioned that, in the programming period 2007–2013, the available European Union funds made it possible to obtain the largest support for all investments in renewable energy sources in Poland so far. The total value of the projects co-financed from these funds has amounted to 2 billion euro. Analyzing the value of investments in technologies based on varied renewable energy sources, an evident disproportion in either the size of particular installations or the costs of investments is observed. We demonstrate that large wind farms constitute more than 60% of the total value of investments in renewable sources subsided by the European Union. Small projects have also been subsided, but mainly those related to solar energy. Generally, the wind energy investments are established in northern and western parts of Poland, including Zachodniopomorskie, Pomorskie, Dolnośląskie, and Łódzkie voivodships, while the solar energy investments are found in the eastern and southern parts of Poland.

The study delves into the intricate question of whether China’s vast renewable resources, specifically wind, geothermal, and solar energy (WGS), can adequately meet the nation’s electricity demands and potentially fulfill its entire energy needs. This study explores China’s transition to renewable energy sources, with the main objective being assess the feasibility of meeting China’s total energy demand through renewables. Based on the historical data from 2010 to 2020, we forecast the development trend of China’s renewable energy and fossil energy demand using gray prediction models. The modeling results indicate that China’s entire electricity demand could be met solely by wind, geothermal, and solar energy (WGS) by approximately 2045. Moreover, if the current development trajectory of WGS is upheld, China’s total energy demand could be satisfied by WGS as early as 2082. Wind and solar power have significantly driven the expansion of WGS, collectively contributing to nearly three-quarters of its growth. However, the development of geothermal energy has progressed more slowly in comparison. Looking ahead, it is projected that China’s total energy demand could potentially be met by a combination of all renewable energy sources – including hydropower, solar, wind, geothermal, and nuclear energy – around 2064. This paper predicts that China’s renewable energy consumption will reach 56% by 2050 and 98% by 2060 respectively. These findings provide valuable insights into the feasibility of achieving “zero-carbon” China and the contribution of renewable energy in this process. The forecast results of this paper are helpful in guiding the development of WGS in China, and are of great significance in promoting sustainable development.

Development of renewable energy systems can certainly contribute to climate change mitigation. In many regions initiatives can be noticed to succeed in increasing the efficient usage of renewable energy resources such as hydro power, solar and wind energy as well as bioenergy. From these resources the bioenergy and the hydro power by their storage possibilities have the potential to counterbalance the temporal variability of solar and wind energy. Anyway, by applying such renewable energy resources it is possible to meet sustainable future national energy-related advisory goals and mitigate CO2 emissions as foremost objective of energy sector strategies on European level. The innovative thinking way of humanity has always been driving the field of shaping more efficient energy supply systems with less negative environmental impacts. The impacts of conventional energy supply systems, especially based on fossil fuels, have been long-perceivable especially on the environment. In the meanwhile, it has become clear that the usage of fossil fuels for operating energy supply systems does not represent a long-term solution. Renewable energy resources, like water, wind and solar energy, must be more used in the future by considering their sustainable usage odds being needed a holistic analysis and assessment by applying methods and instruments of Technology Assessment. In this paper proposal a case study in a region of Republic of Moldova will be presented, where the design of a wind energy-based energy supply system is planned for mitigating climate change. After debating the relevance of technical aspects besides environmental related criteria regarding shaping odds of a wind farm in concrete Moldavian conditions, corresponding environmental aspects will be debated as well as future usage odds of wind energy on a regional level.

An investigation on renewable energy education at the university level in Turkey

The hybrid energy system combines two or more sources of energy to produce and consume the energy efficiently, which results in a flexible source. Hybrid source in this work is made up of a combination of solar and wind energy. The result is superior because these two resources are complementary. Maximum power is extracted from two renewable energy sources such as wind and solar energy. Fuzzy logic method & Modified Power Variable Ratio Step based Perturb and Observe algorithms are utilized in this MPPT approach to extract the highest wind and solar power output with less or no oscillation than other MPPT methods. SEPIC converter is introduced to raise or reduce the output voltage level while the Z- Source inverter is used for conversion of DC to AC. MATLAB is used to model solar, wind, battery, converter, inverter and create rules for fuzzy algorithms. Finally, the extracted maximum power from two sources is given to the microgrid.

Many regions in the world exhibit temporal complementarity of solar and wind energy. In such regions, during certain time periods, when more solar energy is present, lesser amount of wind energy is available and vice-verse. The motivation of this work is to develop a general planning methodology for the integration of these variable renewable energy (VRE) resources in smart power grids, while exploiting temporal complementarity to minimize the supply demand mismatch. We develop an appropriate analytical framework to determine the total investment needed in such VRE resources and the fraction of the total investment in each resource. A multivariate optimization problem is formulated and an optimal algorithm is developed to determine these parameters. To test the proposed methodology, a case study is developed for a region in Northern Ireland. In this region, based on the historical data of past 10 years and using daily average wind and solar capacity factors, we determine the Pearson correlation coefficient, which turns out to be −0.34, showing a sufficient degree of complementarity (anti-correlation) between solar and wind energy. Planning parameters are determined for different load profiles in our case study. General conclusion of the work is that once the temporal complementarity of solar and wind energy resources is exploited, the net supply variability is significantly reduced in microgrids. However, the total investment costs also increases, which is offset by the savings in the storage costs. In addition, reduced variability also leads to a reduction in storage losses, emissions losses, dispatch losses, fuel costs and network congestion.