Impact of Solar Panel Orientation on the Integration of Solar Energy in Low-Voltage Distribution Grids

In Belgium, and many other countries, rooftop solar panels are becoming a ubiquitous form of decentralised energy production. The increasing share of these distributed installations however imposes many challenges on the operators of the low-voltage distribution grid. They must keep the voltage levels and voltage balance on their grids in check and are often regulatory required to provide sufficient reception capacity for new power producing installations. By placing solar panels in different inclinations and azimuth angles, power production profiles can possibly be shifted to align more with residential power consumption profiles. In this article, it is investigated if the orientation of solar panels can have a mitigating impact on the integration problems on residential low voltage distribution grids. An improved simulation model of a solar panel installation is constructed, which is used to simulate the impact on a residential distribution grid. To stay as close to real-life conditions as possible, real irradiation data and a model of an existing grid are used. Both the developed model as the results on grid impact are evaluated

Wireless synchronisation for low cost wireless sensor networks using DCF77

Wireless Sensor Networks (WSN) consist out of multiple end nodes containing sensors and one or more coordinator nodes which poll and command the end nodes. WSN can prove very efficient in distributed energy data acquisition, e.g. for phasor or power measurements. These types of measurements however require relatively tight synchronisation, which is sometimes difficult to achieve for low-cost WSN. This paper explores the possibility of a low-cost wireless synchronization system using the DCF77 long wave time signal to achieve sub-millisecond synchronisation accuracy. The results are compared to conventional GPS based synchronisation. As a practical example, the implementation of the described synchronisation method is proposed for a non-contact electrical phase identifier, which uses synchronised current measurements to distinguishing between the different phases in an unmarked electrical distribution grid

SWT Field Lab: de wind in cijfers

Het Small Wind Turbine Field Lab (SWT Field Lab), gelegen naast het GreenBridge Wetenschapspark in de achterhaven van Oostende en gefinancierd met middelen van de Hercules stichting, biedt onderzoekers maar ook fabrikanten van kleine windturbines de mogelijkheid om niet alleen de prestaties en betrouwbaarheid van kleine windturbines te testen, maar ook onderzoek te voeren naar netintegratie, mechanische sterkte en optimalisatie, geluidsproductie en generatorontwerp

Impact of solar panel orientation on the integration of solar energy in low-voltage distribution grids

In Belgium, and many other countries, rooftop solar panels are becoming a ubiquitous form of decentralised energy production. The increasing share of these distributed installations however imposes many challenges on the operators of the low-voltage distribution grid. They must keep the voltage levels and voltage balance on their grids in check and are often regulatory required to provide sufficient reception capacity for new power producing installations. By placing solar panels in different inclinations and azimuth angles, power production profiles can possibly be shifted to align more with residential power consumption profiles. In this article, it is investigated if the orientation of solar panels can have a mitigating impact on the integration problems on residential low voltage distribution grids. An improved simulation model of a solar panel installation is constructed, which is used to simulate the impact on a residential distribution grid. To stay as close to real-life conditions as possible, real irradiation data and a model of an existing grid are used. Both the developed model as the results on grid impact are evaluated

The small wind turbine field lab

The emerging market of small wind turbines (SWT) is characterised by a large variety of turbine types as well as turbine performance. The abundance of more ‘exotic’ types of vertical axis wind turbines (VAWT) next to the more traditional horizontal axis wind turbines (HAWT) shows that this market is still developing. However, some technologies have proven to possess the same potential typically only found in larger wind turbines. To study the (lack of) performance of current small wind turbine but also to demonstrate their potential, Ghent University decided to launch the Small Wind Turbine Field Lab (SWT Field Lab). This fully scientifically equipped field lab, funded by the Hercules Foundation, offers the possibility to not only monitor the energy yield of the turbine, but also collect information on how to optimise the grid integration, measure mechanical stress and structural strength of turbine components, assess the generator design and tower construction, perform acoustic measurements and finding ways to reduce noise production, even simulate siting of wind turbines, e.g. in rural areas or on industrial parks. All of these parameters are correlated with meteorological data measured on-site. The field lab, based in the inner port of Ostend, provides provisions for placement of up to ten small wind turbines, with seven turbines already partaking in the field trials. The project members aim to use the project results to identify and remove performance limiting factors in the design of small wind turbine, and to demonstrate the feasibility of using small wind turbines for decentralised renewable energy production. With this and similar research projects, the emerging market of small wind turbines can grow beyond its current state of infancy, comparable to the market evolution of large wind turbines

Addressing the challenges of a nuclear phase-out with energy synergies on business parks

Similar to many other Western countries, Belgium has committed to internationally set climate goals, such as the reduction in primary energy consumption and the increase in the share of renewable energy production in the total energy mix. Additionally, Belgium has decided to phase out its nuclear energy production, the nation’s largest source of low carbon electricity. In this paper, the role of Belgian business parks and industrial clusters in contributing to the climate goals is investigated, based on the experiences of the authors on several business parks and industrial clusters. The concepts of cogeneration, advanced thermal grids, and local energy communities are discussed and applied on pilot clusters. Their effectiveness towards achieving the climate goals is evaluated, and finally, some policy recommendations are proposed. The results are based on the Belgian situation but are valid for other countries facing similar challenges

Battery storage integration in voltage unbalance and overvoltage mitigation control strategies and its impact on the power quality

The increased utilisation of distributed renewable energy sources in low voltage grids leads to power quality problems such as overvoltages and voltage unbalance. This imposes challenges to the distribution system operators to maintain the power quality in their grids. To overcome these issues, energy storage systems could be integrated together with the distributed energy resources and the stored energy could be used when needed to better improve power quality and achieve better grid performance. However, integrating an energy storage system introduces additional cost, therefore, determining the right capacity is essential. In this article, an energy storage system is combined with the classical positive-sequence control strategy and the three-phase damping control strategy. The three-phase damping control strategy is able to mitigate the voltage unbalance by emulating a resistive behaviour towards the zero- and negative-sequence voltage components. This resistive behaviour can be set on different values such that the desired voltage unbalance mitigation is achieved. Hence, the three-phase damping control strategy, equipped with the energy storage system is investigated under different values of the resistive behaviour. Both control strategies are investigated under the same conditions and the impact of the different capacities of the energy storage systems is investigated

Solar commercial virtual power plant

Installed photo voltaic energy grew exponentially during the last decade. One of the driving forces was the often generous governmental support. In Belgium (Flanders) for example, investors could acquire green power certificates worth €450/MWh during several years. However, due to the large boom of solar plants and hence rising subsidy cost, governments are dropping this support (eg. €450/MWh in 2009 to €90/MWh in 2012 for Flanders). In this paper the authors investigate if solar energy can become more profitable if forces are joined in a Commercial Virtual Power Plant to sell the solar power on the wholesale market. The numbers are based on the Flemish region, however, the same procedure can be applied to other markets as well. It turned out that for existing installations the potential benefits are marginal due to the small share of the energy revenue compared to the subsidy revenue in the total income of a solar plant. However, lower subsidies and coupling with other production resources and (flexible) consumers promise to be more profitable, although this needs more investigation

Possible power quality ancillary services in low voltage grids provided by the three-phase damping control strategy

The share of renewable energy is increasing because of environmental concerns and favorable economic conditions. The majority of the distributed energy resources, connected to the low-voltage grid, are inverter-connected units. These inverters are controlled by using specially developed control strategies to determine the power injection between the primary source and the grid. In the past, the connection of distributed energy resources was based on the connect-and-forget principle, but this approach leads to severe power quality problems. Nowadays, more sophisticated control strategies need to be developed, so that ancillary services can be provided to the distribution system operator, which will allow further increase of renewable share in the distribution grids. This article examines the technical capabilities of the three-phase damping control strategy to provide ancillary services to the distribution system operator. Besides the three-phase damping control strategy, the article also compares the classical positive-sequence control strategy. Active power drooping and reactive power exchange are combined with these control strategies and the effect on the annual energy production, power quality, and grid performance is assessed. The simulations are conducted on a Matlab/OpenDSS platform in a time series simulations