An Inverter based Distributed Energy Resource (DER) is expected to have an insignificant effect on the system grounding when in normal parallel operation with the Utility. However, when in unintentional islanded mode with the feeder breaker open, ground fault overvoltages (GFOV) may occur due to disconnection of the system neutral ground and the resulting neutral point shift. This should be averted to prevent equipment failure even if it is only for a very short duration due to anti-islanding controls.

Solar installations are becoming more common-place and are often installed in environments where harmonic distortion from large non-linear load structures, such as variable speed drives (VSDs), and supply voltage regulation issues are present. These supply power conditions can compromise the solar system operation, its continuity of service and shorten the equipment life cycle. High levels of voltage distortion, voltage imbalance, poor voltage regulation, and transient/surge considerations are being experienced in installations within Oil & Gas, Agricultural, Industrial, Commercial and many other environments.

Building on Mirus Lineator Filter’s success in the industrial market for harmonic mitigation and power conditioning, we are introducing the Lineator into the Solar market as a power conditioner to substantially reduce background Vthd from the utility to significantly less than the IEEE Std 519-2022 limits for utility voltage distortion. We have created the following questions to help determine if your applications could benefit from using the Mirus Lineator filter.

In 2013, Sean Hammond, VP of Operations at Barrie, Ontario-based EthoSolar found himself in a bit of a tight spot when a 500 kW solar installation in Southern Ontario was not allowed by the utility to connect to the grid. The non-MIRUS supplied transformer was deemed insufficient because of the utility’s interpretation of Hydro One Network Inc.’s Transformer Interconnection Requirements (HONI TIR). Without the ability to connect to the grid, the project remained incomplete, putting a strain on EthoSolar’s construction financing.