The operation and maintenance personnel of Gaotan Power Supply Station of Guangdong Huizhou Huidong Power Supply Bureau of China Southern Power Grid conducted an investigation at the construction site of the new outlet line of the substation. Courtesy of Huizhou Power Supply Bureau.
One is in the east, surrounded by mountains and seas, and is a desirable city of mountains and seas;One is in the west, with undulating mountains, and has the reputation of "the back garden of the Pearl River Delta". Huidong County and Longmen County are at both ends of Huizhou City, and with the development of the city and the people's higher expectations for a better life, the requirements for more reliable power supply guarantee are on the agenda.
This year, China Southern Power Grid Guangdong Huizhou Power Supply Bureau (hereinafter referred to as "Huizhou Power Supply Bureau") launched the balanced development of the "east and west wings" power grid, and took multiple measures to continuously promote the upgrading of power grid construction in remote mountainous areas and old revolutionary areas from the aspects of introducing special plans, building a strong grid foundation, improving the level of operation and maintenance, and promoting lean management and control. Through the balanced development of the power grid, we will support the high-quality development of Huizhou's counties, towns and villages, and help promote Huizhou's "Millions and Millions Project" with stronger and more reliable power guarantees, so as to serve the coordinated development of urban and rural areas.
Written by: Lan Dan, Li Kaiyan, Zhuo Dingming, Song Ying, Zhuang Chuyu, Chen Yiying.
Issued a special planning report.
Promote the upgrading of the "east and west wings" power grid.
Huidong County is a coastal mountainous county, with the largest power supply area in the city, and the load includes the load of industrial parks, coastal tourism and real estate along the river, and the load of mountainous areasThe topography of Longmen County is mainly mountainous and hilly, and the load includes the load of industrial parks, the load of Nankun Mountain, hot spring tourism and real estate, and the load of mountainous areas. This is a detailed special planning report on the balanced development of Huizhou's east and west power grids (hereinafter referred to as the "special planning report").
Balanced development, planning first. In view of the unbalanced and insufficient regional development of Huizhou and the weak grid of Huidong and Longmen counties in the east and west wings, Huizhou Power Supply Bureau has started special planning and key tackling problems since the beginning of the year to solve the problems of the people's urgency.
We have repeatedly visited the mountainous areas where the power grids of the two places are weak for on-site discussions and field investigations. Zhong Hongmei, deputy general manager of the planning and development department of Huizhou Power Supply Bureau, said that in view of the weak links of the grid, the planning department analyzed and found problems one area at a time, formed a targeted plan, and focused on arranging projects to improve the reliability of power supply in remote mountainous areas.
The two counties have different degrees of weak grid structure, insufficient substation spacing, distribution network some lines can not be transferred, large branches account for a high proportion, long power supply radius, some mountainous power supply areas are large, load scattered, etc. Zhong Hongmei said, "We came up with solutions in different categories. ”
In the special planning report, different solutions are listed for different problems. For example, priority should be given to solving the super-large branches of more than 20 medium-voltage households or more than 2,000 low-voltage households, and the methods of serial trunk dismantling and self-loop of nearby branch lines should be adopted to reduce the number of segmented and branch users and improve the reliability of power supplyReasonable distribution of 35 thousand volt stations in mountainous areas, priority is given to lines with a power supply radius of more than 30 kilometers;For low-voltage stations with potential new loads, the new stations meet the ...... such as load growth
In order to ensure the quality of power supply in remote mountainous areas far from the market town center, the Huizhou Power Supply Bureau plans to carry out branch interconnection with neighboring jurisdictions. At present, Huidong Lianghua and Huicheng Hengli, Longmen Mazhu and Boluo Henghe in Huizhou City have branch interconnection projects planned and put into storage. The cross-city interconnection is communicating with the neighboring Shanwei and Zengcheng power supply bureaus to coordinate the feasibility and construction plan of cross-district liaison to form a branch ring network and create a new model of "two-city co-construction".
In addition, we have also established a linkage mechanism and a rapid resolution mechanism for emergency projects, opened green channels, accelerated the resolution of key problems, and effectively improved the reliability of power supply and the level of power supply services in remote mountainous areas. Yuan Haozhe, the director of the distribution network investment plan of the Planning and Development Department of Huizhou Power Supply Bureau, said that up to now, the upper and lower linkage work meetings have covered 68 power supply stations in Huizhou City, and more than 50 questions have been collected in 150 on-site meetings, all of which have been answered.
Optimize the construction and strengthening of the grid structure.
Strengthen muscles and bones" to enhance the ability to ensure supply.
In October this year, Daxing Village, the most remote village in Gaotan Town, Huidong County, Huizhou City, ushered in a happy event, the village's "Maotianju" B&B was inaugurated and opened, and the construction of the rooftop photovoltaic power station of the B&B also started at the same time. Behind this, reliable electricity** gives important support.
Wang Pan, the reliability and power quality management director of Huidong Power Supply Bureau, introduced that Gaotan, known as the "Red Capital of the Dongjiang River", is at the end of the Huizhou power grid line. Now that the problem is solved, the failure rate has been reduced by 80%.
Relying on the commissioning of the first substation in Gaotan, we were able to build new lines, re-optimize the grid structure, greatly shorten the power supply radius, and deliver high-quality power to the last mile in remote mountainous areas. Huang Yuchao, deputy director of Gaotan Power Supply Station of Huidong Power Supply Bureau, introduced.
Huizhou Power Supply Bureau upgraded and optimized the east and west wing grids based on the development characteristics of the two counties, and built differentiated power grid projects according to the different load needs of tourist areas, mountainous areas, and industrial parks, so as to provide support for local economic and social development and promote the high-quality development of rural power grids.
With the support of the rural revitalization policy, with the economic development, the bamboo and wood processing industry in the area has initially formed a scale. However, due to the fact that the area is powered by a single transformer and a single power supply of 35,000 volt Tiegang Station, and is transmitted by three 10,000 volt lines, there are still problems such as heavy load and inability to transfer, no communication between stations, long power supply radius, and "low voltage" in the station area. The lack of power supply capacity restricts the development of local processing enterprises to a certain extent.
How to "tailor" a "power heart" for the remote mountainous areas of Longmen?Huizhou Power Supply Bureau promotes the construction of the first 35,000-volt distribution substation station area, independently develops the first 35,000-volt station operation and maintenance strategy and automatic modeling technology of Guangdong Power Grid, realizes the centralized monitoring and control of the distribution substation area, and optimizes the operation mechanism of the main distribution network, clarifies the scope of regulation, etc., after the implementation of the project, it will effectively solve the "bottleneck" problem of the power grid of long-distance power transmission of local lines and insufficient distribution of substations, and transmit strong power for bamboo and wood processing in Longtan Town.
According to the special planning report, in the next five years, Huizhou Power Supply Bureau will plan to build 2 220 thousand volt substations, 11 110 thousand volt substations and two 35 thousand volt substations in HuidongOne 110 thousand volt substation and two 35 thousand volt substations are planned to be built in Longmen. Huizhou Power Supply Bureau will continue to optimize the construction of a strong grid structure, "strengthen muscles and bones" to enhance the ability to ensure supply.
Multi-party consultation" lean operation and maintenance.
Carefully guarded to improve the reliability of power supply.
In the Nankunshan area of Yonghan Town, Longmen County, Huizhou City, there is an endless stream of tourists after winter, Liu Xi, owner of "Changleju" B&B, said: "In the past, winter was happy and sad, and there were many tourists who came to hot springs and farmhouses, and in December it was full every day, but the more peak the season, the more worried about the sudden power outage, this year there is no such trouble at all, the experience of tourists has been guaranteed, and we have more repeat customers." ”
This year, in addition to accelerating the key reliability improvement plan of the east and west wings, the east and west wings also carried out accurate diagnosis of operation and maintenance problems in the region. For example, in terms of rectifying frequent power outage lines, the bureau will carry out a comprehensive overhaul of the 10,000-volt furnace off the line of Nankunshan, the "star line" in Longmen County in 2022, and replace the section that crosses the ultra-high tree barrier by 264 kilometers of insulated wires, synchronous installation of large flow arresters, improvement of 66 ground networks, replacement of 54 old fittings insulators, the implementation of reliability-based section differentiated operation and maintenance strategy, the line will achieve "zero permanent failure" in 2023.
Chen Zhuoyun, deputy manager of the biotechnology department of Longmen Power Supply Bureau, said that Longmen focused on the three key links of operation and maintenance of "inspection, testing and repair", accelerated the coordination and solution of key problems that affect the safe operation of equipment, and continued to make efforts from the three aspects of "equipment defects are cleared to the bottom, operation hidden dangers are cleared, and engineering problems are cleared", and "23 measures" are formulated to accurately reduce jumps. The data shows that this year, the failure rate of the longmen medium voltage line decreased by 40 year-on-year63%, and the number of failures due to all types of causes has been greatly reduced.
We dynamically adjust the O&M strategy according to the time and local conditions based on seasonal and local characteristics, and release the performance dashboard of the person in charge of the equipment unit every month to quantify the work and visualize the O&M quality. Xiao Dongyu, assistant director of distribution management of the production technology department of Huizhou Power Supply Bureau, said that this year, the Ministry of Biotechnology organized backbone forces to go to Huidong and Longmen counties many times to dig deep into the causes of fault tripping from multiple dimensions such as technology and management, and formulate improvement measures from all aspects such as grid improvement, operation and maintenance improvement, user management, and new technology applications. "For example, before the peak tourist season in the coastal area of Huidong, we strengthened power supply maintenance and monitoring;In the past three years, we have increased the capacity and renovated 62 stations to ensure that the power in the Longmen area is sufficient during the Spring Festival. ”
At the same time, Huizhou Power Supply Bureau is accelerating the transformation to digital monitoring and intelligent operation.
In February this year, the general manager of Huizhou Power Supply Bureau set up the "Distribution Network Digital Empowerment Working Group" to tackle the construction of a medium-voltage power outage monitoring system, based on building the system into an important tool for a comprehensive understanding of the power grid and improving the quality and efficiency of work. Li Rui, assistant general manager of the information center of Huizhou Power Supply Bureau, introduced that through the integration of the city's metering and distribution terminals, negative control terminals and other equipment alarm information, telemetry data and scheduling OCS switch displacement information, through the digital research and judgment algorithm directly generated power outage events, changing the previous mode of manual filling in the power outage event. "At present, relying on the medium-voltage transparency system, we can achieve a penetrating grasp of the situation at the fault site, without relying on work orders and consultation sites, which helps us better implement power outage management and improve the efficiency of power repair. Li Chong, assistant director of equipment status and environmental monitoring of the production command center of Huizhou Power Supply Bureau, said.
Nowadays, the production command center can directly use digital analysis methods such as heavy overload, three-phase unbalance, and low voltage to form a portrait of the station area and output a list of abnormal problems in the station area. The operation and maintenance personnel solve the problem according to the list, intelligently monitor and implement the machine to run errands for people, and the precise operation and maintenance helps double the efficiency, and the power supply quality of the distribution network and the user's sense of power gain are further guaranteed.