IEEE Std 1547.1a-2015 pdf download – IEEE Standard Conformance Test Procedures for Equipment Interconnecting Distributed Resources with Electric Power Systems.
5. Type tests Insert “5.13” into subclause 5 paragraph 3 as follows: Signal injection test methods may be used to conduct tests in 5.1, 5.2, 5.3, 5.4, 5.8, and 5.10, and 5.13. 5.3 Response to abnormal frequency conditions Insert new subclauses after 5.3.2.3.3 5.3.3 Real power reduction test where the EUT responds to over frequency The manufacturer shall specify the response characteristics of the EUT real power reduction in response to over-frequency events. 5.3.3.1 Purpose The purpose of this test is to verify the EUT changes its output of real power in response to over-frequency events as specified by the manufacturer. 5.3.3.2 Procedure Where the EUT can respond by providing multiple characteristics, this test shall be performed with the most severe combination of characteristics of the available settings. This procedure uses the step-wise ramp function defined in A.5 and a series of test frequencies sufficient to reproduce the manufacturer’s response characteristics (including hysteresis, and dead band) with an accuracy to evaluate the manufacturer’s accuracy. a) Connect the EUT according to the instructions and specifications provided by the manufacturer. Where the EUT requires a separate test input source to conduct this test, that source shall be capable of supplying 150% of the input power required to evaluate the EUT in this test regimen. b) Set the EUT operating mode to the non-curtailed power output mode. c) Set all EPS source parameters to the nominal operating voltage and frequency. d) Set all EUT parameters to the rated real power conditions for the EUT.e) Record applicable settings. f) Record the EPS source frequency and the real power generated by the EUT. g) Set the source frequency to a value (F b ) at least twice the manufacturer’s stated frequency sensing accuracy below the over-frequency power reduction initiation setting. The source shall be held at this frequency until power output is stable. h) Step the source frequency from the initiate point to the highest frequency value (F f ) equal to the manufacturer specified final point plus twice the manufacturer’s specified accuracy using the step- wise ramp function defined in Annex A. Observe and record the time and real power versus frequency until steady state is achieved.