Regulation of the reactive power of a WEC using the ASRU application on MV level

This paper is focused on challenges related to an increased quantity of distribution energy resources connected to the distribution network within the context of newly defined requirements ENTSO-E, follow-up European standards TS 50549 and codes of distribution system operators on regulation of voltage through control of the reactive power in terms of P-Q diagram. A high number of connected and operated distribution energy resources results in changes in quality parameters of voltage in a distribution grid. The evaluation of the measured parameters enables to detect overvoltage or voltage fluctuations that are not in accordance with requirements of EN 50160 standard. This paper describes courses of voltage during operation of a wind energy converter (WEC) operated in parallel with the CEZ Distribuce distribution network (DN) on medium voltage (MV) level with the prescribed control of the reactive power to a fixed value of a power factor and the control of the reactive power depending on voltage. The measurement results of U, P, Q values evaluate an influence of the voltage reactive power in a point of connection of a power generating plant to the grid with regard to keeping the voltage within a range of operating limits.