Recently, the working delegation of the Northern Power Corporation (EVNNPC) led by Mr. Vu The Nam - Member of the Board of Members (BOM) had a working session with Thanh Hoa Power Company (PC Thanh Hoa) on monitoring and evaluating the results of implementing investment in medium and low voltage power grid according to the target program for the period 2021-2025.
Overview of the working session.
The focus is on clarifying the implementation of investment and renovation of multi-split, multi-connection (MDMC), loop, grid automation (DMS) projects...
Director of Thanh Hoa Hoang Hai Electricity Company reports to the working delegation.
Reporting to the working group, Director of Thanh Hoa Power Company Hoang Hai said: Up to now, Thanh Hoa Power Company is managing and operating 28 110kV substations, 67 lines with a total length of 1,084.78km; 251 medium-voltage lines with a total length of 7,453.31km and 12,947.8km of low-voltage lines ensuring safe and stable operation to meet the electricity needs of more than 851,000 electricity customers in the entire Thanh Hoa province. For intermediate transformer stations, there are currently 15 stations (a decrease of 14 stations compared to the same period in 2023).
The power loss in the first 9 months was 3.84%, 0.79% lower than the same period and 0.13% lower than the annual plan; regarding 110kV incidents, no 110kV substation incidents occurred; transient line incidents decreased by 1 compared to the same period in 2023 and decreased by 4 compared to the 2024 plan target; line extension incidents decreased by 2 compared to the same period in 2023 and decreased by 1 compared to the 2024 plan; medium and low voltage grid incidents decreased by 20 compared to the same period in 2023. Commercial electricity reached 5,883.60 million kWh, an increase of 11.23% compared to the same period in 2023. Typical capacity in 2024 Pmax 1,482MW. By operating flexibly and making the most of MDMC loops, DMS helps to isolate the minimum scope of power outages and minimize the scope of customer power outages, improve the reliability of power supply... the company's indicators on safety, average electricity price, electricity production and business and some other fields all achieved and exceeded the targets assigned by the Corporation.
Regarding the MDMC and DMS programs: From 2020 to present, Thanh Hoa Power Company has implemented 9 MDMC categories and 6 loop renovation categories according to the Corporation's annual topics. In fact, the completed MDMC and medium-voltage loop renovation projects have created flexible loop connections in power supply, optimally shared/exploited the capacity of 110kV substations through medium-voltage loops, reduced losses and greatly improved the reliability of annual power supply.
Along with that, the Company has connected the self-closing circuit breakers (Recloser), switching devices (LBS), medium voltage cabinets (RMU) to the remote control center and configured the loop circuits according to the annual grid automation topic (DMS) of the Corporation with 442 LBS/RE/RMU devices to the Remote Control Center; the number of medium voltage feeder bays that have run the DMS problem is 64 feeders; applied grid automation (DMS) to 34 loop circuits. DMS application helps to isolate, handle incidents, reduce power outage time, significantly improve power supply reliability, connect devices to the Remote Control Center to reduce travel time to operate on the grid, monitor operating parameters, incidents, analyze and investigate incidents accurately, especially in Thanh Hoa area with long-distance lines in mountainous areas such as DZ 373 E9.12 to Ba Thuoc district, DZ 371 E9.12 to Quan Son district, DZ 374 E9.12 to Quan Hoa - Muong Lat... In addition, Thanh Hoa PC always cares and focuses on investment and renovation of the power grid system, just counting the replacement of long-term operating transformers, up to now the unit has replaced 372 transformers.
Entering 2025 and the following years, Thanh Hoa PC will continue to review, register the list, establish and submit for approval investment plans for construction of ring circuit, multi-split - multi-connection projects. In which, select the main ring circuits for the load areas in region 1 to carry out renovation to ensure N-1 with 4 medium-voltage lines in Thanh Hoa city and Bim Son town, then consider region 2 with 6 medium-voltage lines. Build multi-split sections to connect the grid to share the load, flexibly supply electricity when there is an incident; install additional multi-split devices such as Recloser, LBS for the lines to ensure grid segmentation, reduce the number of customers losing power, the average goal is that each line has 2-3 segmentation devices (about 600 devices/251 lines).
In the period of 2025-2030, according to the Corporation's program orientation on grid automation, the Company will select stable loops, with no change in grid structure for at least 3 years to implement DAS/DMS; deploy connection of RMU cabinets in cities and towns to the Remote Control Center. In the immediate future, the priority load area will be Thanh Hoa City (region 1).
Regarding the program to reduce power loss (TTĐN) of the medium and low voltage grid, up to now, the Company has selected transformers according to the Corporation's criteria of having TTĐN ≥4.5% and average power loss of over 2,000 kWh/month to develop investment and construction plans. The unit has proposed 33 categories and the Corporation has assigned 18 categories. Review, synthesize and develop plans to replace overloaded transformers, operating time over 30 years, poor operating efficiency, with high risk of incidents to perform condition-based maintenance, based on equipment status (CBM).
Representatives of the Corporation's professional departments and units analyzed and evaluated a number of indicators in this working session. Thereby, they gave comments and proposed key solutions to remove difficulties and obstacles to help the unit ensure the completion of the assigned production and business plan.
Through the report of Thanh Hoa PC and the actual inspection, the specialized Boards of the Corporation and the unit deeply analyzed and evaluated a number of indicators in the working program content. Thereby, giving comments and proposing key solutions to remove difficulties and obstacles to help the unit ensure the completion of the production and business plan assigned by EVNNPC in 2024 as well as the entire period of 2021-2025 and orientation for the period of 2025-2030.
Making recommendations to the working group, PC Thanh Hoa suggested that the Corporation pay attention to prioritizing capital sources to invest in renovating the received power grid to improve power quality and reduce power loss, and improve the reliability of power supply. In the immediate future, it is to provide power for the Lunar New Year and the hot season in 2025... as well as reduce low-voltage grid losses to below 5%, so that no customers will have low voltage. With the attraction of investment in economic development, the demand for electricity of customers in the province is increasing day by day. The Company hopes that the Corporation will continue to pay attention, direct the substations and related units to speed up the progress and complete the 110kV projects being implemented as well as invest in the construction of new 110kV substations. For annual target programs, the Corporation will hand over investment portfolios early so that the unit can complete all stages, especially in the work of registering land use plans to carry out compensation and site clearance.
In addition, the Northern Power Corporation is requested to consult with the National Power Transmission Corporation to closely follow the progress and complete the 220kV Sam Son and Hau Loc station projects according to the planning to prevent overload of the 110kV regional grid and meet the n-1 criteria, reducing losses in the 110kV grid; report to the Vietnam Electricity Group to soon have a policy to invest in the 220kV Thieu Yen and Ba Thuoc stations to ensure power supply for the western region of Thanh Hoa province.
The working group inspected the remote control center and some power grid locations managed by Thanh Hoa PC in the area.
Mr. Vu The Nam - Member of the Board of Directors of Northern Power Corporation delivered a concluding speech at the working session with Thanh Hoa Power Company.
Concluding the meeting, Mr. Vu The Nam, Member of the Board of Directors of the Northern Power Corporation, acknowledged the efforts and achievements of Thanh Hoa Power Corporation, and requested the unit to focus on researching and proposing highly effective solutions. The focus is: Closely following the projects and policies of the Corporation, focusing on investment, construction and completion of projects on schedule. Organizing a review of the entire current status of the power grid system, clearly pointing out the main problems to focus on proposing the most appropriate solutions. Strengthening control, supplementing and adjusting procedures; regularly coordinating with the Project Management Board, connecting with local authorities to receive attention, support and direction on related issues to help power projects in the area reach the finish line on schedule. It is necessary to re-evaluate the old project proposed for the medium and low voltage grid in the period of 2021-2025, on that basis, upgrade and adjust accordingly, complete the elimination of the remaining intermediate stations in 2025; deploy the model and gradually apply the smart grid that meets the conditions and brings efficiency into the management and operation work.
Promoting the tradition of a unit with a long history and many glorious achievements, the leadership, officers and employees of Thanh Hoa Power Company continue to strengthen solidarity, raise determination, join hands to ensure the concentration of resources and intelligence to excellently fulfill all assigned targets and tasks, worthy of the trust of the Party Committee, government and people in the province, the expectations of Vietnam Electricity Group and the Northern Power Corporation.
Hung Manh (Thanh Hoa Electricity)
Source: https://baothanhhoa.vn/danh-gia-ket-qua-thuc-hien-dau-tu-luoi-dien-trung-ha-ap-tinh-thanh-hoa-giai-doan-2021-2025-229827.htm
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