In the new era, the State Grid Corporation has started a new journey to build a world-class energy Internet company with outstanding competitiveness. The core of building a world-class energy Internet is to build a world-class strong smart grid.
State Grid Zhejiang Electric Power Co., Ltd. accurately grasps the development strategy of the new era company, adheres to the concept of safe, high quality, economic, green and efficient power grid development, accelerates the construction of a strong smart grid, strives to build a first-class modern distribution network, and comprehensively promotes re electrification. A modern network that targets world-class regional energy interconnection is rapidly spreading.
State Grid Corporation proposed that in order to achieve the strategic goals of the new era, we must always adhere to the construction of a strong smart grid with UHV as the backbone network and coordinated development of all levels of power grids, to create a new interconnected, intelligent, flexible, flexible and controllable new The first generation of power systems is a core task.
Zhejiang, where the primary energy self-sufficiency rate is seriously insufficient, has now tasted the sweetness of transformation and development because of energy interconnection.
On April 12th, the large-screen figures of the Jinhua Converter Station of ±800 kV Binkin high-voltage DC project continued to pulsate. The duty officer Wei Linlin told the reporter: "Today, this line has sent 130.89 billion to Zhejiang. kWh clean water and electricity." This figure is equivalent to one-third of Zhejiang's total electricity consumption in 2017.
With the commissioning of four UHV projects in Binjin, Huai'an, Zhefu and Lingshao, Zhejiang has taken the lead in building a “two-crossing and two-straight†UHV backbone network in the country, realizing energy interconnection in the northwest, southwest and east. And the shift from in-place balance to nationwide energy-optimized configurations.
Chen Xixiang, director of the State Grid Zhejiang Power Development Planning Department, said that the role of the power grid in the allocation and utilization of energy resources in Zhejiang is fully apparent. "From 2017, Zhejiang suffered a rare high temperature, and the electricity load was refreshed six times. The province did not have an orderly use of electricity, which created a favorable environment for Zhejiang's economic and social development."
On April 2, Zhu Zhangquan, chairman of Zhejiang Hailiang Co., Ltd., said that when the entire project was completed, our annual electricity consumption will increase by 150 million kWh. The power environment for several years gives us the confidence to make the company bigger."
From January to March of 2018, Zhejiang's total electricity consumption was 97.55 billion kwh, and industrial electricity consumption was 63.559 billion kwh, up 11.18% and 5.46% respectively. The economic growth has gone up, and the good ecological people can also see that the average daily air quality ratio of the cities in 69 provinces and above in the province is 90%.
Creating a safe and controllable next-generation power system is the cornerstone of energy connectivity. State Grid Zhejiang Electric Power puts intrinsic safety requirements through the whole process of grid planning, design, construction and operation, in-depth study of the operation mechanism of UHV hybrid large power grid, strengthening the prevention and control of grid operation risk, construction frequency emergency coordination control and batch load control system, power grid The ability to prevent and withstand risks is constantly increasing.
According to the development concept of the new generation power system, Zhejiang Energy Internet has taken shape: UHV project introduces western energy on a large scale, 500 kV backbone grid is rationally laid out, 220 kV realizes stratified zoning, and DC distribution network technology leads the country. Zhoushan five-terminal flexible DC and the world's first high-voltage DC circuit breaker provide the possibility for DC transmission and new energy development and utilization. The world's first 500 kV XL submarine cable and 380 meters of the world's highest transmission tower will soon be Become a big country in the 500 kV Zhoushan networking project...
The tentacles of the energy Internet are constantly expanding. In 2018, State Grid Zhejiang Electric Power will invest 31.2 billion yuan in power grid infrastructure, and start the construction of 110 kilovolts and above with a length of 1998.69 kilometers. The "14th Five-Year Plan" power grid plan will also be launched. The company will also fully implement the three-year action plan for the main network infrastructure, starting from the design source, strictly controlling the construction quality, and ensuring the intrinsic safety of the Zhejiang power grid.
To build a first-class distribution network and reinforce the key links of power supply servicesThe distribution network is an important foundation of the energy Internet and a key link affecting the level of power supply services. State Grid Corporation proposed that it should focus on the goal of high-quality, interactive, and cost-effective first-class modern distribution network, so that the structure is reasonable, moderately advanced, and advanced in technology.
Shaoxing, with a history of more than 2,500 years, is the representative of medium-sized cities in China. In order to change the “follow-up†mode of urban distribution network construction, solve the problems of complicated power grid structure, overlapping supply areas, insufficient supply capacity, and inefficient repeated construction, State Grid Zhejiang Electric Power has carefully diagnosed the distribution network in the old city of Shaoxing. Accurately predict the power demand, scientifically design the grid structure, draw a blueprint to the end, complete the target grid construction in 4 years, so that the power supply reliability of the old city will be increased from 99.99% to 99.9991%, and the average annual power outage time of customers will be Reduced to 52 minutes in 52 minutes.
Feng Jinluo, the engineering manager of Shaoxing International Trade Building, did not know what the target grid was, but the feeling was very direct: "In the past two years, our old building has never stopped." The target grid also greatly reduced the operation and maintenance of power equipment. The cost of repairing labor and capital, the annual urban network overhaul costs have dropped by half.
In 2018, State Grid Zhejiang Electric Power will take the target grid as the guide, implement the grid upgrade project, and create a “five good†distribution network with “good structure, good equipment, good technology, good management and good serviceâ€. The average power outage of customers in the core area of ​​the prefecture-level city is no more than 15 minutes, and it is expected to use three years to basically build the target network frame of the city's central city. The construction of the target grid in one step will also be promoted nationwide.
Making the grid benefit the urban and rural areas is a key step in accelerating the implementation of the rural revitalization strategy and regional coordinated development strategy.
“After the transformation of the power grid in the town, the door was clean and the air conditioner was more and more moving. I re-decorated the store.†On April 3, Wu Meihong of the Dajingshan Ecological Farm in Hangzhou was busy with tea-seeking. Tourists, "Now we can use electricity not worse than the city. Every weekend, people in the city are going to the countryside!"
In Huzhou, the birthplace of the "two mountains" theory, the "ecology + electricity" project has made the countryside more and more modern. After the rural power grid was upgraded and upgraded, the power line was “reformed upâ€. In the past, the mine was covered with photovoltaic panels. The farmers started the farmhouse and sold the “landscapeâ€. The bamboo products processing industry used clean energy all the time. One industry was strong, the people were rich, and the ecology The green development path of the United States is getting wider and wider.
State Grid Zhejiang Electric Power actively cooperated with the government to carry out comprehensive environmental improvement of small towns, vigorously build a modern rural distribution network, and achieve full coverage of rural distribution automation. As of the end of 2017, Zhejiang completed the transformation and upgrading of power grids in 3014 central villages. The power supply reliability rate of the central village power grid is 99.931%, the comprehensive voltage pass rate is 99.997%, and the average transformer capacity is 4.21 kVA. The power supply capacity and service level can be comparable with most cities in the country.
The problem of uneven development has been solved, and the quality of life of rural residents has also improved. According to the data of the Zhejiang Bureau of Investigation of the National Bureau of Statistics, the per capita disposable income of rural residents in Zhejiang Province in 2014 was 24,956 yuan, a year-on-year increase of 9.1%, making it one of the best provinces in terms of balanced urban and rural development.
At present, the company is constructing a new operation and maintenance model in accordance with the “gridization†plan, insisting on planning and leading, grid landing, rolling optimization of distribution network development planning, and continuously optimizing the distribution network structure of the distribution network to build a world-class city in Hangzhou and Ningbo. The special action of urban distribution network is guided by demonstration, adopting “one land, one policyâ€, accelerating the implementation of urban, urban and rural distribution network construction and transformation in the province, and promoting the integration of urban and rural distribution network.
Promote re-electrification and become a leader in energy changeAt present, a new round of energy revolution with the large-scale development and utilization of new energy as a symbol and re-electification as the fundamental path is developing in depth. Building a new generation of power systems with a strong smart grid as the core, and then building a multi-energy conversion technology, intelligent control technology and modern information technology, wide-area ubiquitous, open and shared energy Internet is an inevitable trend of power grid development.
Under the unified deployment of State Grid Corporation, State Grid Zhejiang Electric Power explores the frontier issues of “Great Connection†and “Dazhixiangâ€, vigorously implements the re-electrification strategy, and accelerates breakthroughs in key technologies in areas such as new energy generation and large cloud transfer, and strives to be energy The leader of change.
The company uses the “big connection†to realize the transmission and conversion of energy from the grid, improve the efficiency of clean energy development and utilization, comprehensively access various types of loads, increase the proportion of electric energy in the terminal energy consumption, and build clean, efficient, intelligent and interconnected. Energy industry system.
In 2017, Zhejiang purchased 43.5 billion kWh of clean electricity from the Three Gorges and Xiluodu, saving 13.5 million tons of standard coal and participating in cross-regional inter-provincial surplus renewable electricity spot trading of 1.07 billion kWh.
In recent years, wind power and photovoltaic power generation have advanced by leaps and bounds. Zhejiang's distributed photovoltaic power generation grid number and grid-connected capacity rank first in the country. The company standardizes grid-connected operation management, increases access work, and optimizes grid operation mode. In 2017, it provided grid-connected exclusive services for more than 108,000 wind power and photovoltaic power generation projects, and eliminated 98.1 billion kWh of clean energy. Nearly a quarter of the electricity consumption of the whole society has achieved the full consumption of clean energy power generation in Zhejiang.
According to the relevant requirements for the establishment of the Clean Energy Demonstration Province, the proportion of non-water renewable energy generation in Zhejiang will reach 7% in 2020. In the face of rapid development of new energy, State Grid Zhejiang Electric Power is building an active distribution network, relying on advanced information communication and power electronics technology to actively manage large-scale access to distributed energy; on-demand through flexible topology Customize the trend, realize the optimal allocation of energy; adjust the user's electricity consumption behavior through the market mechanism to ensure the full consumption of clean energy and full load of diversified loads.
The future of the energy Internet places more emphasis on interactive sharing. The company uses “Dazhixiang†to enhance the open interaction and smart sharing ability of the grid to energy services, so that all parties can interact and share energy without differentiation, and achieve high integration and two-way interaction of energy flow, information flow, business flow and capital flow. Promote coordinated, complementary and efficient allocation of multiple energy sources in the region.
At the other end of the grid, the energy consumption side, electrification is generating catalysis in various fields such as transportation, commerce, and life.
State Grid Zhejiang Power Innovation proposed a multi-party cooperation shore power construction operation mode, which led the Ministry of Communications, the National Energy Administration and the State Grid Corporation to sign a tripartite strategic cooperation agreement to open the green shore power construction along the Beijing-Hangzhou Grand Canal, the eastern coast and the Yangtze River. The company selected Haining Yanguan and Dongyang Hengdian to take the lead in the construction of “all electrified scenic spotsâ€. In 2017, State Grid Zhejiang Electric Power completed 3,328 electric energy replacement projects, replacing 8.16 billion kWh of electricity.
It’s the dream of many people to come and go. State Grid Zhejiang Electric Power optimizes the layout of electric vehicle charging network, builds 418 electric vehicle charging and replacement stations, 4760 charging piles, and 100% access to the “vehicle network†platform to achieve full coverage of charging facilities in major expressway service areas and core areas of key cities. The fast charge network is fully covered, and the province's unified charging facility intelligent service platform is built, and one card is in hand, and there is no worries.
How does new energy make cities more efficient? The Jiaxing Urban Energy Internet Integrated Pilot Demonstration Project focuses on the urban energy big data sharing platform and improves infrastructure such as clean energy, low-carbon buildings, smart electricity, and green transportation. It is planned to build a new energy supply and demand balance system with multi-resources, low-carbon energy conservation, information sharing, supply and demand interaction, and open mode before the end of 2019.
Can some islands far from the mainland enjoy continuous and reliable power supply? On the Nanxun Island in Wenzhou, the off-grid microgrid demonstration project not only enabled the effective development of clean energy such as wind and light, but also protected the natural environment of the United Nations Biodiversity Management Demonstration Zone.
In Shangyu, Shaoxing, the National 863 Project “Key Technologies for High-density Distributed Energy Access to AC/DC Hybrid Microgrid†demonstrates the technical barriers for new energy security and stable access to large power grids, and realizes the first user of AC/DC hybrid microgrid in China. Commercial operation.
Haining Jianshan source network, the reservoir and the active distribution network, Hangzhou Jiangdong New City intelligent flexible DC distribution network ... more wisdom is gestating here.
Aiming at high quality and focusing on the forefront, a wide-area, open and shared regional energy Internet is providing a model for energy interconnection in China and around the world.
SFP (Small Form-factor Pluggable) can be simply understood as an upgraded version of GBIC. GBIC (abbreviation for Gigabit Interface Converter) is an interface device that converts gigabit electrical signals into optical signals. GBIC is designed to be hot-swappable. GBIC is an interchangeable product that meets international standards. Gigabit switches designed with GBIC interfaces have a large market share due to flexible interchangeability.
GBIC modules are divided into two categories: one is the GBIC module used by ordinary cascade to realize the ordinary connection with other switches; the other is the stack dedicated GBIC module to realize the redundant connection with other switches.
GBIC was basically replaced by SFP for the following reasons:
SFP (Small Form-factor Pluggables) can be simply understood as an upgraded version of GBIC.
SFP module (the volume is reduced by half compared to the GBIC module, and the number of ports can be more than doubled on the same panel.
Because the SFP module is basically the same as GBIC in function, it is also called Mini-GBIC (Mini-GBIC) by some switch manufacturers.
The SFP module further compresses the size and power consumption by putting CDR and electric dispersion compensation outside the module. Used in optical communication applications in telecommunications and data communications. SFP connects the motherboard and optical fiber or UTP cable of network equipment such as switches, routers and other equipment. SFP is an industrial specification supported by some fiber optic component providers.
SFP supports SONET, Gigabit Ethernet, Fiber Channel and some other communication standards. This standard is extended to SFP+, which can support 10.0 Gbit/s transmission rate, including 8 gigabit Fibre Channel and 10GbE. Introduced the optical fiber and copper core version of the SFP+ module version. Compared with the Xenpak, X2 or XFP version of the module, the SFP+ module keeps part of the circuit on the main board instead of the module.
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