Protect.QVAR Dynamic reactive power compensations

In the past, power distribution networks were designed and built, usually assuming a unidirectional power flow and expected consumption fluctuation levels within a limited tolerance. Today, the rapidly advancing development of renewable energy and the resulting decentralization of power generation units brings about a characteristic change of load flows in the distribution networks. When the timing of the power generation profile deviates significantly from that of the load profile in a particular network section, the result is a temporary reversal of the load flow direction causing sudden extreme power peaks. While the current-carrying capacity of the lines is still sufficient in many cases, the permissible voltage limits are more frequently reached or exceeded due to the modified load flow characteristics.

Grid Control, Protect.QVAR, Dynamic reactive power compensations, STATCOM
Grid Control, Protect.QVAR, Dynamic reactive power compensations, STATCOM


Power electronics, such as voltage regulator based solutions and STATCOM controllable distribution transformers, are particularly suitable for dynamic alignment of voltage to the load characteristic. These often provide an economical alternative when compared to otherwise necessary and costly grid expansion.

Based on PV inverter technology used in demanding applications for many years, with the newly developed product Protect.QVAr, AEG Power Solutions offers a solution for the dynamic supply of capacitive and inductive reactive power in low- and medium-voltage distribution networks. This can be particularly beneficial in medium voltage networks for active and dynamic voltage regulation. Voltage regulation can refer both to the connection node of the Protect.QVAr ("Local Voltage Control") as well as on a remote measurement point ("Wide Area Voltage Control"). Reactive power is supplied continuously and without any time lag, so that compliance with voltage band limits is ensured even in the face of highly fl uctuating load flow. Infinitely variable adjustment prevents the occurrence of transient surges or undervoltages. The device’s communications interface also enables remote specification of reactive power reference values, and allows integration of the device in a superordinate control circuit. In addition to its application for voltage regulation, Protect.QVAr can also contribute to meeting the increasing demand for reactive power in the medium voltage grid so that the delivery from the parent transmission grid can be reduced accordingly.


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