Accelerated Loss of Mains Change Programme (ALoMCP)

Following the investigation into 9 August 2019 power outage, approximately 550MW of embedded generation was disconnected. In some cases, due to the expected operation of the rate of change of frequency protection system but in other cases because some generators may be operating incorrect protection settings.

To avoid future outages, the ALoMCP was initiated to amend the loss of mains (LoM) settings on generation in GB. In summary these are to remove vector shift (VS) as an allowable LoM technique, and to change any rate of frequency protection (RoCoF) settings to new, less sensitive values.

The vast majority of the SMA inverters do not explicitly rely on RoCoF or VS techniques, as we decided either to use an active LoM protection or to disable the LoM protection for those inverters with a power higher than 50 kW. To sum up, the LoM settings in the following inverters do not need to be changed and do not use RoCoF / Vecor shift as a means of disconnection:

  • SHP 150-20 and SHP 100-20
  • STP 50-40
  • STP 25000TL-30, STP 20000TL-30 and STP 15000TL-30
  • STP 20000TLEE-10, STP 15000TLEE-10
  • STP 20000TLHE-10, STP 15000TLHE-10
  • STP 17000TL-10, STP 15000TL-10, STP 12000TL-10, STP 10000TL-10 and STP 8000TL-10
  • STP 12000TL-20, STP 10000TL-20, STP 9000TL-20, STP 8000TL-20, STP 7000TL-20, STP 6000TL-20 and STP 5000TL-20
  • WTP 9000TL-20, WTP 8000TL-20, WTP 7000TL-20, WTP 6000TL-20 and WTP 5000TL-20
  • STP10.0-3AV-40, STP8.0-3AV-40, STP6.0-3AV-40, STP5.0-3AV-40, STP4.0-3AV-40 and STP3.0-3AV-40
  • SB 5000TL-21, SB 4000TL-21, SB 3600Tl-21 and SB 3000TL-21
  • WB 5000TL-21, WB 4000TL-21, WB 3600Tl-21 and WB 3000TL-21
  • SB 5000SE-10, SB 3600SE-10
  • SB 5000TL-20, SB 4000TL-20, SB 3000TL-20 and WB 5000TL-20
  • SMC 5000A, SMC 6000A, WB 5000A and WB 6000A
  • SMC 4600A-11, SMC 5000A-11, SMC 6000A-11, WB 5000A-11 and WB 6000A-11
  • SPR-5000M, SPR-6000M and SPR-7000-11M
  • SMC 7000HV-11
  • SBS3.7-10, SBS5.0-10 and SBS6.0-10
  • SB3.0-1AV-40, SB3.6-1AV-40, SB4.0-1AV-40 and SB5.0-1AV-40
  • SB3.0-1AV-41, SB3.6-1AV-41, SB4.0-1AV-41, SB5.0-1AV-41 and SB6.0-1AV-41
  • SI 6.0H-11 and SI 8.0H-11
  • SB 2500TLST-10 and SB 3000TLST-10
  • SBS2.5-1VL-10
  • SB 240-10

For the inverters MLX/STP 60-10 and SHP75-10, we have defined three country settings for the UK. Two of them contain RoCoF settings in accordance with the G59/3. Similarly, for the inverters TLX and FLX, the country setting contains RoCoF settings in accordance with the G59/3. The RoCoF settings need to be changed or set to disable as specified in the ALoMCP.

Inverters that do use RoCoF / Vector shift as a means of disconnection:

Inverter Type RoCoF or Vector shift used Information on how to change the settings
STP 60-10 Yes
SHP 75-10 Yes

Information about Windy Boy inverters

Inverter Version Release date RoCoF
WB1100/ WB1200/ WB1700 Earlier than 2.91 July 2009 0.25Hz/s must be set to 4
WB100LV Earlier than 1.23 August 2008 0.25Hz/s must be set to 4
WB2500/ WB2800/ WB3000 Earlier than 2.82 October 2008 0.25Hz/s must be set to 4
WB4600A/WB5000A/WB6000A All - 0.25Hz/s must be set to 6