Purpose This purpose of this test is to verify that the governor reacts in a correct manner to a simulated ROCOF event. This is achieved by injecting a simulated frequency into the governor and recording the Units response. It is recommended that the governor is isolated from the system frequency in order to perform this test so that the natural variation in system frequency will not be a factor in the Units measured response. In order to accurately determine 100% of output the unit will run at base load for a period of time before the frequency injections begin. This test is to be performed separately on each fuel or fuel mix that the Unit is capable of running on. Ireland The Unit must demonstrate for the following test cases that: The governor reacts in a correct manner to a simulated ROCOF event. The governor decrement rate is correctly implemented. The governor is continuously acting and responds with the required droop characteristic. The generator withstands large frequency disturbances, and high rates of change of frequency, without tripping. No. Load Frequency Estimated Hold Step Level Injection response for a (for 22 min) with a 4 % minimum droop of Min -0.5Hz 1 +25% 10 minutes load (ramp of 1Hz/sec) Min 0.5Hz 2 TBC 10 minutes load (ramp of 1Hz/sec) -0.5Hz 3 75% +25% 10 minutes (ramp of 1Hz/sec) +0.5Hz 4 75% -25% 10 minutes (ramp of 1Hz/sec) -0.5Hz 5 90% +10% 10 minutes (ramp of 1Hz/sec) +0.5Hz 6 100% -25% 10 minutes (ramp of 1Hz/sec) Northern Ireland Criteria of Assessment: The governor reacts in a correct manner to a simulated ROCOF event. The governor decrement rate is correctly implemented. The governor is continuously acting and responds with the required droop characteristic.
Purpose This purpose of this test is to verify that the governor reacts in a correct manner to a simulated ROCOF event. This is achieved by injecting a simulated frequency into the governor and recording the Units response. It is recommended that the governor is isolated from the system frequency in order to perform this test so that the natural variation in system frequency will not be a factor in the Units measured response. In order to accurately determine 100% of output the unit will run at base load for a period of time before the frequency injections begin. This test is to be performed separately on each fuel or fuel mix that the Unit is capable of running on. Ireland The Unit must demonstrate for the following test cases that: The governor reacts in a correct manner to a simulated ROCOF event. The governor decrement rate is correctly implemented. The governor is continuously acting and responds with the required droop characteristic. The generator withstands large frequency disturbances, and high rates of change of frequency, without tripping. No. Load Level Frequency Injection (for 22 min) Estimated response with a 4 % droop Hold Step for a minimum of 1 Min load -0.5Hz (ramp of 1Hz/sec) +25% 10 minutes 2 Min load 0.5Hz (ramp of 1Hz/sec) TBC 10 minutes 3 75% -0.5Hz (ramp of 1Hz/sec) +25% 10 minutes 4 75% +0.5Hz (ramp of 1Hz/sec) -25% 10 minutes 5 90% -0.5Hz (ramp of 1Hz/sec) +10% 10 minutes 6 100% +0.5Hz (ramp of 1Hz/sec) -25% 10 minutes Northern Ireland Criteria of Assessment: The governor reacts in a correct manner to a simulated ROCOF event. The governor decrement rate is correctly implemented. The governor is continuously acting and responds with the required droop characteristic.
RoCoF-Testing-Procedure.docx