National RfG-Implementations - An Update to Grid Codes and Compliance Schemes.

The European Network Code Requirements for Grid Connection of Generators (ENC RfG), published in 2016, introduced a set of binding grid connection requirements to all types of generator technologies and finally came into force in April 2019. Next to these so-called exhaustive requirements, fixed to all European member states, the ENC RfG also introduced ranges on non-exhaustive requirements that had to be shaped by the member states in terms of national implementations. Moreover, the ENC RfG has given a binding framework on compliance schemes both for the commissioning phase of generators and the compliance monitoring during their lifetime, including certificates, measurements and simulations. Hence, in all over Europe, a full range of new grid codes is on stage, providing some challenges to all parties involved in the installation and operation of power generating modules: to manufactures in terms of technology development of their equipment, to project developers in terms of electrical planning and grid code compliant commissioning processes and to system operators with respect to their newly defined obligations on ensuring grid code conformity. This paper will give a comprehensive overview on the technical requirements defined in the national grid codes based on the general ENC RfG provisions typically applicable to wind power installations with a special focus on codes where additional provisions have been put in place, that exceed the regular scope of the ENC RfG. In addition, arrangements are outlined, that some member states have established in order give to some transitional periods introducing the new ENC RfG requirements. The picture will be completed by a synopsis on specific compliance schemes that have already been defined in some member states or are in current discussion. Different schemes like testing, simulation, certification and inspections will be characterized and compared. A proposal to equipment certificates will be given. The paper will also include a report on the status quo on ongoing international standardization in terms of the testing standard CLC 50549-10 and the work within IEC-RE on a comprehensive certification scheme. The paper will end up with some recommendations on introducing lean, applicable and proven measures to introduce effective and efficient grid code compliance schemes on a standardized basis. [ABSTRACT FROM AUTHOR]