In this blog post we will give a short overview of current developments and trends.
CENELEC, the European Committee for Electrotechnical Standardization, is currently working on CLC/TS 50549-2, a technical specification (TS) intended for generating plants connected to medium voltage distribution power grids. Its comprehensive scope covers aspects of normal frequency and voltage operating ranges, rate of change of frequency, low and high voltage fault ride-through, voltage support, power quality, and reconnection and synchronization after disconnection. It remains to be seen how this specification will impact the wind industry as its content overlaps with the NC RfG legislation, national grid code standards and their respective certification regimes.
The Institute of Electrical and Electronics Engineers (IEEE) has published IEEE Standard 519-2014, a revision to the IEEE Recommended Practice and Requirements for Harmonic Control in Electric Power Systems. It supersedes the IEEE Standard 519-1992 revision. The main approach of the standard is that users are responsible for limiting harmonic currents and system owners/operators are responsible for managing voltage quality at the point of common coupling (PCC). The main changes are related to measurement techniques, time-varying harmonic limits, low voltage harmonic limits (