Tuesday, June 21, 2022
Weekend red alert caused by “underbuilt” lines – NGCP
“Underbuilt” lines from the Peninsula Electric Cooperative, Inc. (PENELCO) caused the grid disturbance last Saturday, resulting National Grid Corporation of the Philippines (NGCP) to declare red and yellow alerts.
“These underbuilt distribution lines are constructed underneath NGCP’s transmission lines and are within the grid operator’s right of way,” NGCP said in a statement. The lines breached the safety clearance along the 230 kilovolt (kV) Hermosa-BCCP line causing the transmission outage.
The grid operator has requested PENELCO to remove the underbuilt lines.
“We are also doing necessary coordination with PENELCO to remove the underbuilt lines within the transmission corridor. We appeal to other electric cooperatives to check their facilities and take the needed action to prevent similar incidents,” NGCP said.
The red alert raised over Luzon Grid caused power interruptions on Saturday afternoon affecting 1.6 million consumers within the Manila Electric Co. (MERALCO) franchise area.
The alert was lifted on Saturday at 5:30 PM, but a yellow alert followed suit until 10:19 PM “to allow affected generating plants to ramp back up,” NGCP explained.
The NGCP also declared a yellow alert on the Luzon Grid on Monday, June 20 after several power plants went ton forced outages. Available capacity in the grid was around 12,351 megawatts (MW) while the demand was at 11,456 MW.
The power plants that went on forced outage include the 150 MW Unit 1 of the Southwest Luzon Power Generation Corporation (SLPGC) plant, the 50 MW SLPGC Units 3 and 4, the 300 MW Unit 2 Sem-Calaca Power Corporation, and two generating units of the Mariveles coal plant totaling 632 MW.
The yellow alert was lifted at 2:49 PM following receding system demand.
https://powerphilippines.com/weekend-red-alert-caused-by-underbuilt-lines-ngcp/
Yellow alert raised on Luzon power grid
Several power plants went on forced outages yesterday, leaving the Luzon grid with a tight supply for a few hours.
In an advisory, operator National Grid Corp. of the Philippines (NGCP) said it raised the yellow alert status on the Luzon grid starting at 1 p.m. until 2:49 p.m.
A yellow alert means there are not enough reserves to cover the largest running generating unit at the time, but does not necessarily lead to power outages.
The NGCP said the grid had only 533 megawatts of net operating margin, with supply at 12,451 MW and estimated demand reaching 11,456 MW.
It said the Luzon grid lost 1,132 MW due to the forced outages of the 150-MW Unit 1 and 50-MW Units 3 and 4 of the Southwest Luzon Power Generation Corp., 316-MW Units 1 and 2 of the GNPower Mariveles Energy Center Ltd. Co. and the 300-MW Unit 2 of the SEM-Calaca Power Corp.
Weekend outages due to right-of-way issue
Meanwhile, the NGCP has asked the Peninsula Electric Cooperative Inc. (Penelco) to remove the “underbuilt” lines that caused transmission outages on June 18.
The grid operator said the outages were caused by Penelco’s underbuilt lines – or distribution lines constructed underneath the transmission lines of the NGCP and are within its right-of-way.
The underbuilt lines breached the safety clearance along NGCP’s Hermosa-Bataan Combined Cycle Power Plant (BCCPP) 230 kiloVolt (kV) lines, causing the outage, it said.
When the system detected the disturbance at 1:53 p.m. on Saturday, the protection system of the NGCP was automatically activated to isolate the affected Hermosa-BCCPP 230 kV lines 1 and 2.
The lines were restored at 2:35 p.m. and 2:44 p.m., respectively.
The NGCP placed the Luzon grid on yellow and red alert following the incident as it caused multiple plant outages.
The red alert status was lifted at 5:30 p.m., while the yellow alert lasted until 10:19 p.m. to allow the affected generating plants to ramp back up.
As of yesterday afternoon, 596 MW from the 1,997 MW actual load of power plants that tripped remained unavailable.
Following the grid disturbance, the NGCP assured the public that necessary measures were undertaken to prevent such incidents from compromising the entire grid.
https://www.philstar.com/nation/2022/06/21/2189766/yellow-alert-raised-luzon-power-grid