Using remote-controlled unmanned aerial vehicles (UAV) with image recording equipment and specialized cameras in power grid management and operation at Lam Dong Power Transmission. Photo: Ngoc Ha/Icon.com.vn. From mid-morning to late-afternoon, the heat reached more than 40 degrees Celsius, blowing hot air in every corner from the countryside to the city, the demand for electricity increased continuously for many days and the transmission grid always at the full load warning threshold. In order to ensure the safe operation of equipment on the transmission grid, the National Power Transmission Corporation (EVNNPT) requires units to strengthen the inspection and monitoring of transformers, resistance, current transformers, etc. voltage transformers, pole clamps, connections on lines, substations. In particular, special attention should be paid to the full-load 500kV transformers such as Viet Tri, Hoa Binh, Nho Quan, Thuong Tin, PleiKu 2, Dak Nong, Vinh Tan and the North – Central 500kV lines. Troubled hot season Deputy Director of Power Transmission Company 3 (PTC3) Ho Cong said that by May 2021, the total installed capacity of solar power will be connected to the PTC3 transmission grid and the distribution grid of Power companies in the region. the area of ​​the provinces: Khanh Hoa, Phu Yen, Binh Dinh, Gia Lai, Dak Lak and Dak Nong has reached 4,093MW, accounting for 36% of the total installed capacity of power sources connected to the transmission and distribution grids in the region. this. In which, the connection at the voltage level of 500kV is 600 MW, at the voltage level of 220kV is 753 MW, at the voltage level of 110kV is 940 MW, and the farm and rooftop solar power connected at the voltage level below 22kV is 1,801 MW. With the very fast development speed of solar power plants, farm solar power, rooftop solar power in a short time, some 220kV transmission lines have been built in Phu Yen, Binh Dinh, Gia Lai and Dak Lak areas. and Dak Nong always operate at full load, overload occurs in the rainy season of the Central Highlands. Especially the 220kV transmission lines: Sinh Mass An Khe – Pleiku (100%); An Khe Biomass – An Khe Hydropower Plant (100%); Quy Nhon – An Khe Power Plant (99%); Quy Nhon – Tuy Hoa (96%); Tianjin – Nha Trang (98%); Nha Trang – Krong Buk (87%); Krong Buk – Pleiku 2: (88%) Dak Nong – Buon Tuahar (102%); Dak Nong – Buon Kuop (99%) and AT1 transformer (97.%), AT2 (96%) 500kV Dak Nong substation; transformer AT1 (94%), AT2 (95%) 500kV Pleiku 2 station; transformer AT1 (100%), AT5 (94%) 500kV Pleiku station… When the power grid is operating in a state of full load or overload, PTC3 must request units to increase the frequency of inspection and monitoring of equipment, transformers, lines and corridors to promptly overcome and handle handle unusual phenomena. In addition, some repair and maintenance works that need to be cut off or periodically tested must be arranged at night when solar power stops generating. The implementation of safety measures, as well as the process of construction supervision, supervision of load-bearing equipment, safety control at poles that cross with medium and low voltage lines and roads at it is dark, at night it will be very difficult, potentially dangerous. Khanh Hoa Power Transmission installed an AI camera to warn of fire in the corridor of the 220kV line: Nha Trang – KrongBuk. Photo: Ngoc Ha/Icon.com.vn According to the document No. 795/TTg-CN dated June 25, 2020 of the Prime Minister on adding the list of wind power projects to the electricity development planning, wind power plant projects in the Central Highlands region. with a total capacity of 2,358MW (accounting for 21% of the total installed capacity of power sources connected to the transmission and distribution grids in this area) is in the process of construction, installation, and putting these projects into operation. November 2021 will put more pressure on the existing transmission grid, which is already full and overloaded in the provinces: Khanh Hoa, Phu Yen, Binh Dinh, Gia Lai, Dak Lak and Dak Nong. In particular, in Gia Lai area, there is a total capacity of 1,242.4MW (voltage level 500kV: 200MW, 220kV: 650MW, 110kV: 392.4MW); Dak Lak area has a total capacity of 685.8MW (voltage level 500kV: 400MW, 220kV: 200MW, 110kV: 85.8MW); Dak Nong area has a total capacity of 430 MW (voltage level 220kV: 380MW, 110kV: 50MW), when put into operation, it will continue to overload 220kV lines of Yang Trung – Pleiku 2 wind power plant; An Khe – Pleiku Biomass, An Khe Biomass – An Khe Hydropower Plant; An Khe – Quy Nhon Hydropower Plant; Krong Buk – Pleiku 2, Dak Nong – Buon Tua shar, Dak Nong – Buon Kuop and AT1 and AT2 transformers at 500kV Dak Nong substation; AT1, AT2 500kV Pleiku substation 2. As a line soldier, the sun also goes to the line, the rain also goes to the line, as a station soldier, flood, or hot weather must be on duty 24/24. In order to mobilize sources effectively, in the current conditions, EVN requires the Power Transmission Companies to transmit the maximum mobilized capacity of the power plant cluster at 100% until the congestion or overload is reached. The associated load is removed. With this requirement, the new operating status of the PTC3 grid is often at 100% full load. Thus, it is necessary to keep the current flowing smoothly in all situations, especially on hot sunny days. With a “hot” area like PTC3, all units, regardless of whether they were on duty or off duty, must gather their manpower to check the grid’s congestion points, the points with high risk of heat generation. The point of line cross-section is small compared to the whole line, the rated current of the equipment in the exposed compartment is smaller than the line, the points have a large deflection, the risk of breaking the distance when the load is high..etc and so on and so forth. problems can occur when the temperature reaches more than 40 degrees Celsius and lasts for many days. It can be said that the transmission shifts during the heat wave are no different from the ones on duty during the flood season. After detecting the risk, it is necessary to propose to reduce the rated current of the line; if the ambient temperature rises suddenly, it is necessary to monitor that the conductor temperature does not exceed the allowable level; make a plan for temporary handling and a plan for long-term handling of bottlenecks of the power grid, determine the time for remediation, and submit it to the Company. For example, during the recent heat wave in May, the transmission units must make statistics of the number of enhanced inspections from the beginning of 2020, thereby proposing a reasonable plan to arrange human resources for the new operation situation; propose the addition of production equipment and tools to serve the operation management in the new operating situation, make a list of proposed equipment to be added immediately. A place to test people’s hearts Using remote-controlled unmanned aerial vehicles (UAV) with image recording equipment and specialized cameras in power grid management and operation at Lam Dong Power Transmission. Photo: Ngoc Ha/Icon.com.vn. Head of PTC3 Dispatch Department Nguyen Manh Tuong said that in the first 5 months of 2021, the electricity output received by the PTC3 transmission grid under management and operation reached 23,918,261,392 kWh, an increase of 16.30% over the same period in 2020; delivered electricity output reached 23,445,807,704 kWh, up 16.10% over the same period in 2020; power output received on the 500kV grid reached 17,223,481,412 kWh, an increase of 26.40% over the same period in 2020; electricity output delivered on the 500kV grid reached 17,000,463,190 kWh, up 26.26% over the same period in 2020; power output received on the 220kV grid reached 13,549,084,784 kWh, up 29.86% over the same period in 2020; electricity output delivered on the 220kV grid reached 13,299,649,317 kWh, up 30.08% over the same period in 2020. Despite this output, the transmission output of Power Transmission Company 3 (Khanh Hoa, Phu Yen, Binh Dinh, Gia Lai, Dak Lak, Dak Nong, Ninh Thuan, Lam Dong, Binh Thuan power transmission lines) assigned to Power companies under the Central Power Corporation (EVNCPC), the South (EVNSPC) and power plants (ND, DT, Solar, EIA) in the first 5 months of 2021, reaching 2,826,264,307 kWh, down 37.85% over the same period in 2020, accounting for 49.18% of commercial electricity output of 9 Power companies. The highest transmission power output in May is May 16, 2021 at 22,436,520 kWh. The main reason for the decrease in transmission power output is due to the performance of commercial power production of Khanh Hoa, Phu Yen, Binh Dinh, Gia Lai, Dak Lak, Dak Nong, Ninh Thuan and Lam Power companies. Dong and Binh Thuan under the Central Power Corporation (EVNCPC) and the South (EVNSPC) in the first 5 months of 2021 reached 5.746 billion kWh, a low growth rate, reaching only 0.67% over the same period in 2020. Meanwhile, the electricity output of 110kV solar power, 22kV farm solar, 0.4kV rooftop solar, small and medium hydroelectricity power generation to the distribution grid of 9 Southern Central and Western Power companies Originally belonging to EVNCPC, EVNSPC increased sharply in the first 5 months of 2021, reaching 5.010 billion kWh. The transmission output of renewable energy sources, medium and small hydroelectricity from the distribution grid, in addition to meeting the load demand of the Power Companies, is also transmitted to the transmission grid at 220kv substations of the Transmission lines. Khanh Hoa, Phu Yen, Binh Dinh, Gia Lai, Dak Lak, Dak Nong, Ninh Thuan, Lam Dong, Binh Thuan in the first 5 months of 2021 are 2.090 billion kWh, which means that the renewable energy output is reversed. to the transmission grid from the distribution grid of the power companies. Thus, the transmission grid under the management of PTC3, in addition to receiving power from the 500kV system and 220kV power plants in the area to supply loads, also receives back-generated output from the distribution grid through the distribution networks. 220kV transformers connected to the national grid cause full load, overload the 220kV grid. This is also one of the reasons for the full load situation for the regional transmission grid, and at the same time brings about the paradox in the operation of PTC3 that the transmission grid managed by PTC3 always operates in a poor condition. state of full load, overload, but the commercial power output did not meet the delivery plan. This shows that there has been an inadequacy when the planned transmission power output is not counted when the renewable energy output is back to the grid. Despite such difficulties, PTC3’s employees are always committed to the power grid and are responsible for their work. They memorized the characteristics of each area of ​​the transmission grid, each compartment of the substation. In the dry season, which columns are at risk of fire due to trees in the corridor. In the rainy season, which pillars are prone to landslide. Which residential areas often fly kites, stretch canvas to dry agricultural products… Just entering the third day of the second heat wave of summer 2021, the national electricity consumption capacity at noon on June 18, 2021, has reached a new peak of 41,709 MW, the PTC3 transmission soldiers are again straining themselves with the harsh climate. of the southern central provinces and the Central Highlands, with the transmission grid always in a state of 100% full load, but not allowing problems due to subjectivity – that is the duty and also the command from the soldier’s heart. Electricity transmission. The current must be kept smoothly despite the unresolved inadequacies, because the story of the mechanism, in order to be removed, still has to be discussed, considered, must be appropriate…and the mission of the transmission soldier is Under any circumstances, the current must be maintained. Because the difficulties that PTC3 is going through is also to test people’s hearts.

The remote operation success rate is over 99%. When an incident occurred, 81% of affected customers were immediately transferred and restored to power in less than 5 minutes (compared to 120 minutes of TCT’s regulation). The process of investment in development and modernization of the power system in Thu Duc City over the past years has shown that the reliability of power supply has improved significantly. Average number of outages per customer (SAIFI) is 1 time/year; the average outage time of a customer (SAIDI) is about 60 minutes/year – much lower than the 2015 index of 6 times/year and 700 minutes/year, respectively. With the motto “Electricity is one step ahead”, Ho Chi Minh City Electricity Corporation has a plan to prioritize investment in the development of the power system for Thu Duc City, focusing on developing smart grids in parallel with deploying other utilities. underground works. The goal is that by 2025, the electricity output supplied to the people of Thu Duc City will reach 5,500-6,500 kWh/person/year, the average number of power outages is less than 0.3 times/person/year and the average duration of power failure. less than 30 minutes/person/year. Mr. Pham Quoc Bao, Chairman of the Members’ Council of Ho Chi Minh City Electricity Corporation. In the period of 2021-2025, Ho Chi Minh City Electricity Corporation will invest about VND 3,200 billion to build a new 220 kV station and 6 110 kV stations (total added capacity is 1,382 MVA), develop 245 new stations km of medium voltage grid; 585 km of low voltage power grid, renovating and installing 447 distribution substations with a total capacity of 363 MVA in Thu Duc city. In this year, the corporation will complete Phuoc Long 110 kV station, start construction of new 110 kV Linh Dong station, 220/110 kV Thu Thiem station and 110 kV Thu Thiem station 1. In addition, the Ho Chi Minh City Electricity Corporation deployed 27 projects to undergroundize the power grid combined with information lines in Thu Duc city, in order to increase the undergroundization rate of the medium voltage grid from less than 50% at present to 75. -80% by 2025. With the motto “Customer is the center”, the electricity industry promotes digital transformation to improve the quality of electricity supply and customer service for the whole Ho Chi Minh City, including Thu Duc City. The focus is on promoting digital transformation in power system operation management and customer service provision in Ho Chi Minh City. The Corporation promotes the development of smart grids in Thu Duc city with the investment of a remote metering system, increasing automatic components on the power grid. Currently, the Corporation has basically completed the installation of distance meters in Thu Duc city. By the end of this year, 100% of medium voltage lines in Thu Duc city will operate fully automatically (DAS/DMS). In the period of 2021-2025, the corporation will continue to invest in strengthening remote control devices for medium voltage lines, along with solutions to close loops, and enhance the form of construction without power cut (live- line), in order to improve the flexibility of transmission, reduce the range and number of customers affected by power outages (if any). View of Thu Duc city. On the other hand, the corporation promotes the development of EVNHCMC Customer Care application (app) on the phone. The area of ​​Thu Duc district (old) has completed the installation of distance meters since 2020. Customers can monitor their daily electricity consumption through this application. All electrical services are provided online by the corporation. Customers do not have to go to the electricity headquarters to register, instead register for the service on the customer care website or via the app) EVNHCMC Customer Service of the corporation. In addition, TCT also promotes the application of 4.0 technology in surveying, designing and improving procedures to continue to improve the electricity access index, ensuring all investment projects through the medium voltage grid. 22 kV power supply for customers is carried out by the electricity industry within 5 days, contributing to attracting investment businesses in the city. “EVNHCMC prioritizes focusing resources, rapidly developing modern power systems in Thu Duc city, in order to ensure the power supply capacity to meet the city’s development needs, constantly improving the quality of electricity. electricity and customer service, contributing to building Thu Duc City into a new growth pole of Ho Chi Minh City, worthy of its potential and meeting the expectations of leaders and people”, Mr. Pham Quoc Bao positive.

Mercedes-AMG’s new hybrid supercar has been around since March when the German automaker introduced its Project One hypercar and F1 racing car for the 2021 season. It can be seen that Mercedes is continuing to experiment to perfect the GT 73e. This is confirmed to be the most advanced variant of the next generation Mercedes-AMG GT 4-Door and is expected to be officially launched later this year. The Mercedes-AMG GT 73e is developed on a new hybrid technology platform called E Performance. In addition to the GT 4-Door, the new generation C-Class will also have a high-performance variant combining a gasoline engine and an electric motor. The power of the 4-door coupe comes from a twin-turbocharged 4.0L V8 engine and an electric motor developed by AMG, providing a total capacity of 804 hp and maximum torque of 1,001 Nm. This parameter is higher than the 630 hp power of the current Mercedes-AMG GT 63 S version. This model is equipped with a high-performance battery pack, a 2-speed gearbox for an electric motor, a 9-speed AMG Speedshift MCT automatic transmission and shared driving technologies from F1 racing.

For power plants and diesel generation sources, currently located in 2 areas: Dung Quat EZ and Bac An Binh village (Ly Son). In Dung Quat EZ, there is a power plant of Dung Quat Oil Refinery, with 4 units (4x27MW), total capacity of 108MW, regularly generating 50-60MW. In Bac An Binh village, the diesel generator system consists of 4 units with a total capacity of 402kW. In addition, in Bac An Binh village there is also a solar energy system that supplies electricity to the people on the island. Specifically, the solar energy system here includes: The battery system consists of 300 IREX panels, each with a capacity of 320Wp, a total capacity of 96 kWp; Sunny Tripower grid connected inverter system with 5 sets, total capacity of 100kW; Storage battery system has 192 batteries, total capacity 9,600Ah; Sunny Island battery inverter system has 12 sets, total capacity of 72kW. Dakdrinh Hydropower (Son Tay). As for solar power, Quang Ngai currently has 2 power plants: Binh Nguyen (49MWp) and Mo Duc (19MWp). In addition, there is a rooftop solar power system installed at the headquarters of Quang Ngai Power Company and the High-voltage Grid Operation Management Team (327kWp); installed at 110kV transformer stations: 295kWp. In particular, customers’ rooftop solar power is quite a lot. Accumulated to December 31, 2020, the province had 1,332 installation customers, with a total installed capacity of 163,881.86kWp. Particularly power from hydroelectricity, currently 10 hydroelectricity has been put into operation. In which, the power source connected to the 110kV power grid is 4 hydropower plants, with a total installed capacity of 263 MW, including: Dakdrinh Hydropower Plant (125MW), Dakre (60MW), Son Tra (60MW), Son Tay ( 18MW). Hydropower source connected to the distribution grid has 6 hydropower plants connected to the medium voltage grid, with a total capacity of 35.6MW, including: Ca Du (2.6MW), Song Rieng (3MW), Ha Nang (11MW) ), Clear Water (16.5MW), Huy Mang (1.8MW), and Nui Ngang (0.7MW). By 2020, these hydroelectric plants will operate and generate electricity to meet the electricity needs of people and businesses across the province. Quang Ngai province is supplied with electricity mainly from the national grid through the 500kV Doc Soi (Binh Son) 500kV transformer station (Binh Son), including: 500kV line from Da Nang – Doc Soi (110km) and the substation 500kV- (450 + 600) MVA Doc Soi. For the 220kV power grid, currently in the province there are 220kV lines Doc Soi – Dung Quat, Doc Soi – Quang Ngai, Doc Soi – Son Ha, Doc Soi – Tam Ky. The 110kV power grid in the province with load in Quang Ngai province receives power from 13 110kV stations, with a total capacity of 953MVA. For medium voltage grid, the entire distribution grid of the province has been operated at voltage levels 22kV and 35kV. Low voltage grid has over 3,520km of low voltage lines. “Currently, Quang Ngai Electricity Company supplies electricity to 13/13 districts, towns and cities of the province; 173/173 communes, wards and towns have electricity (100%). Particularly Be Island – Bac An village. Binh (Ly Son) uses diesel power and solar battery system to supply electricity, the number of households with electricity reaches 99.68%. Commercial electricity output in 2020 will be 1,715 million kWh, up 10.6% compared to to 2019. In the first 2 months of 2021, reaching 324.5 million kWh, up 49% over the same period in 2020. The electricity industry always ensures safe, adequate and quality power supply for the above development needs. area “, Director of Quang Ngai Electricity Company Le Hoang Anh Dung said.

Solar power is being encouraged to use, contributing to creating more clean energy sources, towards the goal of green and sustainable electricity development. Immediately after the Politburo issued Resolution 55-NQ / TW, on February 11, 2020 on the national energy development strategic orientation, the provincial People’s Committee directed the Department of Industry and Trade to coordinate with related agencies and units. research, advise and propose rooftop power development. Department of Industry and Trade proposed the Ministry of Industry and Trade to supplement the planning for 2 solar power plants in Viet Yen and Yen The; solar power projects in industrial zones and clusters with a total capacity of 2,320 MVA. Households in Luc Ngan district install solar power system on the roof. Photo provided by CTV. Mr. Nguyen Duc Hoan, Deputy Director of the Department of Industry and Trade, informed that although power companies stopped connecting and purchased solar power in the case of installation after December 31, 2020, it is only temporary. In general, the State has a mechanism to develop solar power with many attractive policies such as: Buying solar power at high prices, purchasing time lasts 20 years, commercial banks facilitate maximum loans from 70 -80% value of solar power projects in a period of 5-8 years. With the above advantages, many individuals, businesses (DN) and units have been encouraged to take advantage of this energy source. By the end of December 31, 2020, the whole province had 607 customers installing rooftop solar power system with a total installed capacity of 15,936.46 kWp. In which, 10 are enterprises with a total installed capacity of more than 100 kWp or more, the rest are households and non-business units. It is known that since 2017, the province has implemented rooftop solar power development programs in a number of different forms, but mainly supported the installation of pilot models, demonstrations for the purpose of evaluation and replication. power saving; At the same time, it will support 10 state agencies to participate in the use of solar power in the near future. At this time, the Department is assigning the Center for Industrial Promotion and Trade Promotion to assist the People’s Committee of Luc Ngan district to install solar bulbs in the district People’s Committee square. The results and orientations of the province show that the development of solar power in the locality is increasing in both quantity and scale, especially in enterprises. This policy, in the immediate future, has brought about a clear effect, contributing to reducing the pressure, saving costs of developing transmission lines and using clean energy sources. Solve the expired solar battery problem The electricity obtained from the sun is clean energy, but when the solar panels expire, they become garbage, which is very dangerous. According to specialized agencies, the average service life of solar panels ranges from 10 to 20 years, depending on the location and the environment where it is installed. However, the handling of expired panels so far has not had a specific direction. A representative of the leadership of the Department of Industry and Trade – a permanent unit to advise on this content, said that in a written consultation with the Provincial People’s Committee on the development of rooftop power projects, the unit has not yet proposed specific measures for Dispose of the panels when the battery expires. By the end of December 31, 2020, the whole province had 607 customers installing rooftop solar power system, total installed capacity was 15,936.46 kWp. In which, 10 enterprises with a total installed capacity of more than 100 kWp or more, the rest are households and non-business units “. Mr. Nguyen Duc Hoan, Deputy Director of Department of Industry and Trade Discussing this issue with Mr. Nguyen Ba Trinh, an expert from the Department of Environmental Protection (Department of Natural Resources and Environment), it is known that the solar cell when its expiry date is hazardous waste. The disposal of this waste is very difficult, if not handled properly but burying in the wrong regulations, it will pollute the soil and water environment due to generation of heavy metals or toxic emissions. In the event of a fire the battery is capable of harming human health. There is only one unit in the province, Hoa Binh Industrial Waste Treatment and Recycling Joint Stock Company (Yen Dung) that is eligible to handle this type of waste, but the scale of treatment of the enterprise is small. Mr. Trinh also added that, according to Article 68 of the Law on Environmental Protection, the environmental protection responsibilities of owners of production, business and service establishments must “collect, classify, store, treat and dispose of. disposal of solid waste in accordance with the law ”, that is, the investor is responsible for handling the battery when it expires. Therefore, it may be worrisome that, after the expiration of its use term, households dispose of solar panels with domestic waste, do not hire the unit to collect, transport and dispose of it. Unattended authorities. Or the owner of the panel is not able to handle or dispose of the panel into the environment. Thus, solar power development associated with environmental sustainability has not been paid attention. New authorities focus on planning and encouraging expansion to reduce pressure on the national grid without giving specific solutions to handle solar cells when they expire. Some comments said that the functional agencies, especially the Department of Industry and Trade, the standing unit to advise on this content, should soon offer solutions to handle solar batteries after the expiration of use. Hoang Phuong