Power & Energy Solutions

The premier renewable energy publication

PES is delighted to bring you this latest advanced technology solution from ZF Wind Power. Over the last few years total wind turbine noise, which is mainly generated by the interaction of the wind and the wind turbine structure, has changed from being one of the properties of a wind turbine to a true differentiator between different wind turbine OEMs: the less noise the wind turbine generates, the more wind turbines can be placed on the same piece of land without violating the prevailing noise regulations. To achieve this, wind turbine OEMs are investigating among other things reducing overall noise levels by utilising optimised low noise blade design using e.g. serrations and improving controller strategies to include a wide variety of low noise modes. As the overall wind turbine noise is used to mask the noise coming from the mechanical components inside a wind turbine such as the generator and the gearbox, these noise sources also need to be optimised. The low noise blade designs, which are still being studied, have a direct impact on the overall wind turbine noise and thus require the mechanical noise to be reduced at the same pace. Next to that, the increased number of low

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Following the recent news, widely published in the industry and national press regarding a number of offshore wind farms, it seems that last year’s end of warranty inspections highlighted unprecedented amounts of offshore wind turbine, blade leading edge erosion, across several offshore wind farms in Europe. As the offshore wind industry enters the 2018 season blade repair campaigns, there is much to be considered. Early intervention is imperative for the quality and longevity of repairs. PES asked WTG to give us their view on this problem. It is an issue the industry has long been aware of and there are many initiatives in place looking to tackle the issue, such as the Offshore Renewable Energy (ORE) Catapult’s Blade Leading Edge Erosion Programme. Is this the Benchmark for future blade inspection and Integrity management during warranty? The following extract applies: If the expected lifetime of the surface coating is less than the lifetime of the blade, suitable inspection and maintenance intervals should be specified. Inspection and maintenance intervals shall be planned to provide adequate assurance that no significant deterioration in the condition of the installation may arise in the interval. The design should take into account the practicability of carrying out inspections of relevant components

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S&P Global Ratings rated its first onshore wind project in 2003. Since then, the renewable energy sector has undergone tremendous expansion. In the past decade alone, its compound annual growth rate has totalled 20%, thanks largely to the rising awareness of how using fossil fuels for power generation contributes to climate change. In Latin America in particular, where most renewable capacity comes from large hydro plants, onshore wind power sources are playing an increasingly important role. Oaxaca, a region in Mexico, for example, is considered one of the best regions worldwide for onshore wind farms. Its geological formation creates a corridor with consistently strong winds. So, the favourable wind resource, in combination with lower operation and maintenance cost, resulted in the upside of the credit outlook in the region. A global outlook Last year alone, onshore wind added approximately 53 gigawatts (GW) to the global capacity grid – bringing the total to around 540 GW. This is partly due to higher capacity factors and falling prices throughout the wind turbine supply chain, both of which are fostering onshore wind power’s rapid development. However, the sector’s growth isn’t without serious challenges. Wind resource availability has often failed to live up to the initial estimations made

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Achieving the correct bolt pretension is essential in assuring bolted joint integrity. Bolted joints are critical when ensuring the safe operation of wind turbines or other similar bolted connections. In this context, ultrasonic measurement has proven to be a very accurate and cost-effective solution when installing new bolts, as well as when evaluating existing bolts as part of determining the lifespan of wind turbines. R&D explains why to PES. In recent years, wind energy has become an important source of electricity production. As with any other technology, wind turbines have a limit to their time in functional operation. Currently, wind turbines are designed to be efficient and reliable for 20 years, with the possibility of extending beyond that. Continuous inspection of wind turbines is important as it can maximise the turbines’ life expectancy as well as minimise the risk of failure. In this context, the importance of correct bolt pretension is frequently underestimated, as incorrect installation can increase the risk of partial or total failure in wind turbines, since these bolts hold critical components together in the turbine as well as the tower. A fully tightened bolted joint can sustain millions of load cycles without any problems, whereas a joint consisting of untightened

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Although wind power remains broadly powerful as a renewable resource, opposition to wind farms is nothing new. For supporters, wind seems to offer something for everyone: carbon-free electricity, construction and maintenance jobs, and competitive utility rates. Still, wind farms are not accepted by all, and criticism of new wind installations around the world has effectively stalled development of some projects and defeated others. Wind power production in the United States continues to increase, especially when local governments seek to generate more tax revenue, but despite the many environmental benefits, when residents organize and fight a project, they often succeed. Rural residents across America are increasingly rejecting the advancement of wind energy projects in their communities when given a chance. Arguments from wind farm opponents often focus on concerns about disruption of landscapes, noise, aesthetics, reduced property values, and bat and bird mortality. In rural states like Ohio and Minnesota, residents fear that large-scale wind farms will turn rural communities into industrial zones. To shift residents’ views on wind farms, they must be informed of the facts and many benefits of wind as a dominant energy source. South Africa has exceptionally promising conditions for wind power generation but has delayed wind power production,

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PES wanted to know more about how Peterson is applying a collaborative approach, together with transferring expertise and know-how to become a top player in offshore wind and renewables logistics. Sander G van Helvoort, Business Manager Wind & Renewables, Peterson was happy to help with this. The global energy industry is currently under-going a change in direction with leading innovators and companies across the globe working to speed up the transition towards clean and renewable energy sources. Access to sustainable and clean energy sources is essential to the goals set by the Agenda 2030 and the Paris Agreement on climate change. Not only does this lead the charge in sustainable energy, but renewables also contribute to a higher standard of living, as well as better health and education, and is crucial for the productive activities that can raise people out of poverty. With its origins rooted in the Netherlands, Peterson has long been inspired by the culture of its home country, and, as it moves towards renewable energy, paying particular attention to offshore wind power. The European offshore wind market is predicted to record remarkable gains over the coming six years, with the UK, Germany, Poland and the Netherlands all driven by the strict

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The past ten years has seen a massive step change in the renewable energy sector. It is becoming one of the most innovative industries, continually evolving to deliver greater value to wind farm owners and to provide a future-proof solution for our global energy demands. With the demise of subsidy driven economics, the industry has focussed on becoming much more pro-active. Performance optimisation, continual data analysis and cost competitiveness are all essential in the effective management of renewable energy assets, and, at Natural Power, our cutting edge methods have been developed to ensure we match what the industry needs to keep pace. Early last year, we decided to take our ‘ControlCentre’ to the next level. To ensure we were positioned at the forefront of asset management, real time data provision and security requirements, this investment is designed to deliver the next decade of services to a market where our clients demand more flexibility; where interaction between generators, system and network operators becomes more sophisticated; and where intelligent management of assets brings higher returns. Located at our global headquarters in Dumfries and Galloway in Scotland, we embarked on a market leading programme that included the design and build of a new control services

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The battery storage market is expanding and domestic and community users are expected to install small-scale batteries. This is linked to coal phase out and cold waves, such as The Beast from the East. PES invited Keith Robertshaw, Business Development Director from N-ERGY Power Solutions to clarify the link and explain why the batteries market could face a boost very soon as a result. When the Beast from The East unwelcomingly visited the UK, residents were disturbed, and some were locked up inside unable to reach their jobs. It went beyond impacting individuals, it cost UK supermarkets £22m as shoppers made 5% fewer visit to them. The services sector was massively affected as well with Purchasing Managers’ Indices hitting a 20-month bottom low in March. Few would make the link between Beast from the East and Climate Change and some might argue that such waves have always hit the UK. But it is scientifically proven that climate change has been affecting the severity and the rapid frequency of such events. Extreme weather events cause major destructions on every scale, including causing deaths. And fighting such events and climate change is an international mission. But on an individual level, people cannot survive such events without energy. When

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We look into the increasing importance of geophysical and geotechnical pre surveys in the offshore wind market. MMT is a Marine survey company that is leading the way in this specialist area. PES: Welcome back to PES Wind magazine. Thanks for talking with us. For the benefit of our new readers would you like to begin by explaining a little about the background of MMT and the importance of the wind industry to you? Nils Ingvarson and Ola Arvidslund: MMT is a Marine survey company that has been around for over 40 years and for the past 25 years we have grown from a one boat company to a large fleet of operational platforms performing various type of survey operations to the Renewable, marine cable and Oil and gas sector. As for Offshore wind farms, MMT started with the geophysical and geotechnical pre surveys in the late 90s mainly in Danish and Swedish sectors. We have since then increased our operations and extended them to also perform these type of surveys in the UK and Germany primarily. During 2008 to 2010 the increased awareness of UXO (Unexploded Ordnance) made the UXO survey a requirement for these surveys. The UXO survey has also

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