PV/DG Grid Tied Inverter Testing
AC & DC Regenerative Test Systems for PV/DG Grid Tied Inverter Testing
Photo-voltaic (PV) & Distributed generation (DG) systems convert DC from alternative-energy capture devices (wind/solar) or energy storage devices (battery/fuel-cell) into AC power. Many systems with energy storage are bi-directional allowing AC power to be stored as DC energy until it is needed. Some of these products are able to intentionally island for becoming micro grids or providing critical power (UPS) making AC power available especially in remote locations. PV/DG grid tied inverter testing is necessary as all of these applications must comply with multiple regulatory standards (IEEE/UL/NEC/etc.) in addition to being efficient, reliable, and meeting the product’s performance expectations.
NH Research, Inc. (NHR) provides test equipment for PV/DG grid tied inverter testing (Fig. 1) which can simulate the utility connection as well as energy storage devices. For example, the 9410 Grid-Simulator is used to verify product performance AC performance while a 9200 Series Test System may be used to emulate any energy storage system. This combination a complete solution to verify product performance & ensure compliance with IEEE 1547, UL 1741, and similar grid-tied standards around the globe.
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AC & DC Regenerative Testing Products
AC & DC Regenerative
The NHR 9410 Grid Simulator can provide a 1Φ, 2Φ, or 3Φ simulated utility connection while allowing per-phase controls for amplitude, wave shape, & the relative to a phase angle relationship. These features allow testing of any number of AC conditions including phase imbalance (in voltage and/or phase angle relationship), voltage sag, frequency changes, & harmonic injection. The included measurement system removes the need for an additional power meters, DMMs, oscilloscopes, or spectrum analyzers.
The 9200 Battery Test System includes a charge mode, a discharge mode, & a state of the art battery emulation mode which allows testing of a battery or electronically-emulating a battery. Using battery emulation replaces a real battery thereby eliminating risks associated with a battery failure even those potentially caused by a unit-under-test (UUT) failure. Additionally, battery emulation produces faster and more consistent testing by eliminating battery-related preparation time, operator errors, & result variations due to temperature or aging.