Community Research and Development Information Service - CORDIS


HARMONY Report Summary

Project ID: 321149
Funded under: FP7-IDEAS-ERC
Country: Denmark

Final Report Summary - HARMONY (Harmonic identification, mitigation and control in power electronics based power systems)

The global electrical energy consumption is still increasing which demands that the power capacity and power transmission capabilities must be doubled within 20 years. Electric power production is changing from conventional, fossil based sources to renewable energy resources. Highly efficient and sustainable power electronics are increasingly used in power generation, power transmission/distribution and end-user applications. Such large scale expansion of power electronics usage will change the characteristic of the power system by introducing more harmonics and resulting in a larger risk of instability and more losses in future power systems. The future grid will mainly be a solid state based grid with its advantages and disadvantages.
The goal of this project has been to obtain “Harmony” between the renewable energy sources, the future power system and the loads in order to keep stability at all levels seen from a harmonic point view in different time scales. The project has established a number of necessary theories, models and methods to identify harmonic problems in power electronic based power systems, it has been working theoretical with different simulation tools and also on different hardware platforms to to study and enable control of harmonics. The project gives also solutions on how to mitigate the problems as well as developing on-line methods to monitor the harmonic state of the power system eg by looking at the grid impedance.
New methods to assess power electronic converters have been developed interacting with the grid as well as interacting with each other – the methods have enabled a better and a more safe design of the power electronic equipment as well as laying out the grid structure. The methods used are harmonic state space modeling, impedance based modeling as well as more full time domain modeling methods. They are applied to low power grids – eg a low voltage grid, which is supplied with a number of power converters as well as large power grids, which could be a large scale wind farm which is located off-shore. New methods to do the power electronic converter design, eg. how to properly design the filter between the power converter and the grid in order to meet power quality demands in combination with constraints like efficiency and power converter stability have been proposed. In the control of the converter new ideas to actively damp potential harmonic resonances are proposed and demonstrated like synthesizing a virtual impedance between the power converter and the grid. Also being able to design the controllers so they are always stable in a wide range of load conditions by using passivity based design of the controllers for power converters.
More than 10 PhD students have been active in the project where half of them are sponsored by the ERC project, five PhD students are funded by the Chinese Scholarship Council and one has been sponsored by the Danish Innovation Foundation together with Ørsted. A couple of post docs have been working too. A symposium has been held with more than 70 participants in Aalborg and also an IEEE workshop with 140 attendees in 2017 was held. Industry are seeking more and more collaboration with the advanced grant ERC activity – also after the end of the project. New tools for identifying stability problems in power electronics based power systems, new control methods for reducing the harmonic presence and reduce the overall instability risks – both seen from the converter perspective as well as the grid have been obtained and they are attractive in companies. Further, new design methods for active and passive filters in renewable energy systems, in the power system and in the power electronics based are developed and can be used by others. The group has published +50 journal publications and +80 conference papers, where more than 10 of them are highly cited in Web of Science. Finally, new significant funding has been given to continue the research.

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