On the 25th of October, Organization for Cross-regional Coordination of Transmission Operators(OCCTO) summarized the interim report on Hokkaido blackout. According to this content, the background to the blackout on September 6 was as follows.
3: 08
Tomato-Atsuma NO.2 and 4 stopped (1.16 GW)
Kitahon interconnect power line(between Hokkaido & Honshu,or mainland) started power reception
Load cutoff due to frequency drop (first time) (1.3 GW)
Wind power generation stopped due to frequency drop (0.17 GW)
Eastern part in Hokkaido power blackout occurred due to transmission line accident (0.13 GW)
Hydropower stopped due to transmission line accident (0.37 GW)
3: 09 to 3: 11
From central power supply command station(in Hokkaido Electric Power), start command was issued to the hydraulic power / thermal power generators that stopped in balance at that time.
Kitahon interconnect power line received maximum power (0.57 GW)
Around 3:20
Output reduction of Tomato-Atsuma NO.1
Around 3:22
Load cutoff due to frequency drop (second time) (0.16 GW)
3:25
Tomomato-Atsuma No.1 stopped
Load cutoff due to frequency drop (third time) (0.0 GW)
Thermal / hydroelectric power generation stopped due to frequency drop
Kitahon interconnect power line stopped
Hokkaido Blackout
In summary, the direct accidents caused by the earthquake were the following two points.
1 All 3 Tomato-Atsuma power stations stopped (so-called (N-3) event)
※ However, Unit 1 stopped at 3:25, not immediately.
2 4 transmission lines accident occurred ((N-4) event), hydraulic power generation stopped accordingly
The facility response to this was the following two points.
1 Kitahon interconnect power line immediately started receiving power
* However, because it is externally excited, it stopped due to the loss of AC power supply in Hokkaido
2 load cutoffs are performed three times due to frequency drop
From the above, it is appropriate that Hokkaido Electric Power’s response was appropriate, that the accident at this time was an extremely rare event in which the N-3 event of the power source and the N-4 event of the power line overlapped.
As a countermeasure in this time in winter, for the prevention of blackout (or restraint of power outage scale), OCCTO requests Hokkaido Electric Power to roughly take the following three points.
1 Addition of load cutoff amount (0.35 GW)
2 Tomato-Atsuma for the operation, they should assume operation of the Kyogoku pumped-storage power plant etc.
※ At this accident, the Kyogoku pumped-storage power plant (0.20 GW × 2 units) was stopped. In the interim report, had it been driving, it was highly likely that blackout could have been avoided.
3 30% to 35% of demand should be covered by a power supply that can be operated such as thermal power.
These pointed out items will be subject to discussion in the future. Specifically, as measures for maintaining the soundness of Grid, it is important to what extent authority is given to OCCTO, and to what extent can Grid operator approve the authority of cost recovery accompanying measures.
Having made the above request without discussion will be a big issue in the future.
There is no doubt that the recurrence prevention measures above cast a big stone against the current ancillary service. Regarding this point, We would like to comment in the near future.
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