Maximizing Transmission Capacity of the 500kV North-South Power System During Extreme Heatwaves
During the recent period of intense heat, the northern power system continued to record high load increases. To ensure the safe and continuous supply of electricity to the northern region, the four 500kV North-South transmission circuits, particularly the Trung Bac (North-Central) interface, played a vital role by transmitting large amounts of power from the central and southern regions to the north.
Background: Heatwaves and Rising Electricity Demand
The prolonged heatwave has pushed electricity consumption to record levels in northern Vietnam. According to reports from power system dispatch centers, the load in the northern region has continuously remained at high levels, especially during peak hours from 11:00 to 17:00 and from 19:00 to 22:00 daily.
This situation presents significant challenges for ensuring energy security, requiring comprehensive solutions from generation, transmission, and distribution stages.
The Vital Role of the 500kV North-South Transmission System
The 500kV North-South transmission system is considered the backbone of Vietnam's power industry, connecting the three regions of the country. Under normal conditions, this system regulates power flow between regions, but during prolonged heatwaves, its importance becomes even more pronounced.
Particularly, the Trung Bac interface, which connects the central and northern regions, has become a critical point in power flow regulation, ensuring supply-demand balance for the northern region.
Electricity Transmission Mechanisms During Peak Heat Periods
During the recent heatwave, the 500kV North-South transmission circuits have been operating at maximum capacity. The Power Transmission Company of Bac Giang (NPC), which manages and operates the 500kV transmission lines in the northern region, has implemented numerous measures to ensure stable system operation.
- 24/7 monitoring of system operation indicators
- Enhanced patrol and inspection of transmission lines
- Proactive handling of minor incidents as they occur
- Close coordination with related units in dispatch operations
Solutions for Optimizing Electricity Transmission
To ensure safe and continuous electricity transmission, functional units have implemented comprehensive technical and operational solutions:
1. Optimizing Transmission Capacity
Dispatch experts have calculated and adjusted power transmission on 500kV transmission lines to achieve maximum efficiency. This has been accomplished by:
- Redistributing power among parallel lines
- Adjusting operating points of substations
- Maximizing the capacity of transformers
2. Enhancing System Reliability
To minimize the risk of power outages, units have implemented:
- Regular maintenance of critical equipment
- Replacement of old, damaged equipment
- Upgrading remote monitoring and measurement systems
3. Effective Inter-Regional Coordination
Close coordination between power transmission units across the three regions is a decisive factor in ensuring stable electricity supply:
- Real-time information sharing on operational conditions
- Flexible coordination in power adjustment
- Preparation for response plans for abnormal situations
Results Achieved
Thanks to comprehensive solutions, the 500kV North-South transmission system has operated stably, meeting increased electricity demand during the recent heatwave. The following table summarizes the results achieved:
| Indicator | Achieved Result | Comparison with Same Period |
|---|---|---|
| Maximum transmission capacity | 3,800 MW | 15% increase |
| Load fulfillment rate | 100% | No change |
| Average power outage hours | 0.05 hours/customer | 30% decrease |
| Incident rate per 100km of transmission line | 0.2 incidents | 25% decrease |
Prospects and Development Directions
In light of unpredictable climate change impacts and increasing electricity demand, Vietnam's power industry is planning to upgrade and expand the 500kV North-South transmission system:
- Investment in additional parallel 500kV transmission lines
- Upgrading 500/220kV substations to increase transmission capacity
- Application of new technologies such as Flexible AC Transmission Systems (FACTS)
- Development of smart grid systems to optimize operations
Conclusion
The 500kV North-South transmission system has demonstrated its vital role in ensuring national energy security, especially during prolonged heatwaves. The coordinated coordination between functional units and the application of advanced technical solutions have helped the system operate stably, meeting the increased electricity demand of the population.
However, facing challenges from climate change and increasing electricity demand, the power industry needs to continue investing in and upgrading the system to ensure long-term national energy security.