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.
7 Turbine Speed (RPM) Unit to specify, 100ms or as agreed with TSO Unit to specify 8 Vibration (µmp-p) Unit to specify, or as agreed with TSO Unit to specify 9 Path Temperature (°C) Unit to specify, 100ms or as agreed with TSO Unit to specify 10 Bearing Metal Temperature (°C) Unit to specify, 100ms or as agreed with TSO Unit to specify 11 Process variables e.g. Inlet Guide Vane position, Fuel Control Valve position etc. Unit to specify, 100ms or as agreed with TSO Unit to specify 12 Other signals as required by the unit or by the TSO Unit to specify, 100ms or as agreed with TSO Unit to specify 13 Alarm/Event page Screenshot of alarms / events for duration of the test. 14 Generator Overview Screen Screenshots may be required where test data/milestone/event is not available through the trends listed above. 15 EDIL instructions Screenshot as logged during the test. Initial Conditions Should “No” be answered to any of the following, contact EirGrid test coordinator and agree next steps in advance of making any corrective actions. No. Conditions Check on day of test 1 Test Profiles have been submitted and approved by / neartime@soni.ltd.uk. Yes/No 2 Unit Fuel Type: Primary Fuel / Secondary Fuel, Gas / Distillate. Yes/No 3 Normal start up support auxiliary systems in service. Yes/No 4 Required signals, as described in section 10 are available Yes / No The following test shall be ordered sequentially, to align with the agreed test profiles.
3 Inject Ramp change of -0.5 Hz Ramp at 1 Hz/Second, hold for 1 second then +1 Hz ramp of 1 Hz/Second and maintain the frequency injection for a minimum of 10 minutes Completion time (t+10mins): ____ 4 Generator Test coordinator contacts CHCC and requests to remove the frequency simulation to allow the unit return its pre injection load under governor action 5 Stop recording 6 Step completed 75% -0.5 Hz Ramp at 2 Hz/Second Step Action Event Time Comment 1 Generator control room contacts CHCC and requests the following: Issue an EDIL Dispatch Instruction to bring the unit to XX MW (75%) Confirmation of the MW swing that will occur during the frequency injection 75% Load: ___MW 2 Confirm data recording of signals as set out in section 10 3 Inject Ramp change of -0.5Hz at a rate of 2 Hz per second and maintain the frequency injection for a minimum of 10 minutes Completion time (t+10mins): ____ 4 Generator Test coordinator contacts NCC and requests to remove the frequency simulation to allow the unit return its pre injection load under governor action and coordinates details for next MW dispatch 5 Stop recording 6 Step completed 75% +0.5 Hz ramp at 1 Hz/Second hold for 1 second -1 Hz ramp of 1 Hz/Second Step Action Event Time Comment 1 Generator control room contacts CHCC and requests the following: Issue an EDIL Dispatch Instruction to bring the unit to XX MW (75%) Confirmation of the MW swing that will occur during the frequency injection 75% Load: ___MW