From January to July this year, the company's operating areas accumulated 346 billion kilowatt hours of new energy power, an increase of 15.3% over the same period of last year, including 294.92 billion kilowatt hours of wind and solar power, and the utilization rate reached 96.3%, with a year-on-year increase of 2.5 percentage points. 2019 is a crucial year to promote new energy consumption. As the largest grid connected to new energy in the world, how can the State Grid continue to improve the new energy consumption capacity?
New technology and new mechanism to ensure the integration of new energy
The company actively serves new energy consumption, formulates and implements 22 measures to promote new energy consumption, including power grid construction, dispatching operation, market trading, technological innovation and other aspects, and has achieved remarkable results.
In order to better meet the needs of high proportion of new energy access, the company has overcome the virtual synchronous machine technology, and the ± 500kV flexible DC grid, low-carbon Winter Olympics smart grid, and intelligent interactive charging of electric vehicles are also breeding and growing, which significantly improves the safe and stable operation level of the power grid, meets the intelligent, controllable and flexible requirements of the new generation of power system, and ensures the new energy Get along well with big power grid.
Nowadays, in many areas, new energy enterprises have felt the high-quality new energy grid connection service of the State Grid. In Hami, Xinjiang, the first and the largest comprehensive energy base of "wind power and thermal power" bundled with "Xinjiang power transmission", Xinjiang Hami power supply company provides new energy enterprises with "one-stop service" in the whole cycle of grid connection and commercial transportation, and adopts advanced control means to optimize the active power output of wind farm to realize the full coverage of new energy automatic generation control system (AGC) In areas with intensive power consumption and strong power grid structure, professionals adopt low-voltage local access mode to realize local power consumption of eight wind farms, and adopt high-voltage centralized access to the Internet in areas with intensive wind power and small power load, thus realizing the optimal allocation of large-scale resources.
The company proposes to speed up the implementation of flexible transformation of thermal power units in the process of promoting new energy consumption, and strive to complete the transformation scale of more than 40 million kilowatts in 2019; standardize the construction and operation management of coal-fired self provided power plants, the grid connected coal-fired self-contained power plants are under the same management as public power plants, subject to the unified dispatching of the power grid, undertake the peak load regulation obligations and corresponding social responsibilities, and improve the network related nature of new energy stations To provide support for high proportion of new energy access and operation.
The company's promotion of ubiquitous power Internet of things will also help promote new energy consumption, explore and establish a long-term mechanism to serve the development of new energy, and promote the coordinated development of source, grid and load; develop and build a new energy big data management platform, focusing on the company's core business, focusing on government's social concerns, focusing on customers, focusing on the role of value, so as to improve the power grid in order to meet the main needs of all parties The efficiency and service level of the whole business link provide support for the high-quality development of new energy.
UHV transmission channel helps new energy consumption in a large range
Sitting at home in Hunan, it uses solar energy from Gansu Province to generate electricity; wind power from the three northeast provinces, passing through Tongliao in Inner Mongolia, instantly lights up the lights of Shandong Province Nowadays, many people can enjoy the clean power from the three north regions (northeast, northwest and North China) without leaving their homes. The construction of trans provincial and trans regional transmission channels for clean energy has become an important reason for the continuous and substantial improvement of wind and light in China.
Gansu Province, located in the three north regions, has a rapid growth of new energy installed capacity, but its own consumption is limited, and the grid development lags behind due to factors such as long construction approval period, which once led to the phenomenon of abandoning wind and light. Since the 12th Five Year Plan, a total investment of 76 billion yuan has been invested in Gansu Power Grid. The first and second channels of 750 kV and a series of 330 kV transmission projects have been built, greatly eliminating the problem of power grid "neck jam". In August 2017, the world's first UHVDC project from Jiuquan to Hunan was completed and put into operation, which made a great contribution to Gansu's new energy transmission.
"Since 2016, the consumption of our wind farm has gradually improved, and the power generation has increased rapidly. In 2018, the power generation exceeded 160 million kwh, which changed the difficult situation for many years, and the business operation of our wind farm turned from loss to profit." On July 20, in Pingchuan District of Baiyin City, Gansu Province, Wang Xiaoming, general manager of caicaitang wind farm of state investment Baiyin Wind Power Co., Ltd., said.
Not only Gansu Province, but also the continuous promotion of UHV power grid construction projects across the country has given full play to the role of power grid resource allocation, effectively improved the ability of new energy delivery, and promoted the scientific and high-quality development of national clean energy. At 3:00 on June 4, the 1 000 kV AC UHV transmission and transformation project from xiong'an to Shijiazhuang was put into operation, forming the world's first UHV AC double loop network in Beijing, Tianjin, Hebei and Shandong with the completed UHV projects of Ximeng Shandong and Mengxi Tianjin South, laying the foundation for 100% clean power supply in xiong'an new area and energy security in North China. This year, the company will speed up the construction of Zhangbei xiongan UHVAC, Qinghai Henan, Yazhong Jiangxi, Shanbei Wuhan UHVDC, Zhangbei flexible HVDC and other transmission channels to meet the needs of access and transmission of new energy projects.
The construction of UHV transmission channel provides a new way to realize large-scale consumption of clean energy by means of "marketization". Among them, Beijing Electric Power Trading Center has played an important role in actively promoting inter provincial clean of new energy. It has also carried out special market trading of power generation rights, promoted the substitution of clean energy for conventional energy, and carried out the power generation rights trading of clean energy such as replacing Shandong thermal power plant with northwest new energy, Gansu Power transmission to central China, Sichuan Hydropower Replacing Qinghai thermal power plant, Ningxia self provided power plant and Hunan power plant.
With the development of power market, the consumption level of northwest new energy power generation province has been improved. Taking Gansu Power Grid as an example, in 2018, the State Grid Gansu Electric Power Company completed 3.336 billion kwh of replacement electricity in the whole year by carrying out the power generation right replacement transaction of its own power plant. By carrying out the northwest region replacement, short-term real-time and Gansu Xinjiang mutual economic transaction, the State Grid Gansu Electric Power Company generated 445 million kilowatt hours of new energy electricity; through the provincial direct transaction, it completed the direct transaction of 268 million new energy users Watt hour consumed 92 million kilowatt hours of trading electricity on the spot; in particular, through actively carrying out cross provincial spot trading of surplus new energy, the trading power was 3.249 billion kwh, accounting for 46.7% of the total transaction volume of State Grid and 12% of the total power generation of new energy in Gansu Province.
"In order to better promote the consumption of new energy, Gansu spot market mechanism is closely designed. Combined with the characteristics of large installed capacity and high proportion of new energy in Gansu Power Grid, the spot electricity market in line with Gansu characteristics will be built. When the new energy can not be absorbed in the province and there is the phenomenon of abandoning wind and light, new energy enterprises shall be organized to participate in cross regional spot trading, and carry out cross provincial spot trading and clearing of surplus for new energy with peak load regulation restriction in the province. " Pang Wei, director of regulation and Control Department of power dispatching control center of State Grid Gansu Electric Power Company, said.
Promoting new energy consumption through coordination
From 0:00 on June 9 to 24:00 on June 23, Qinghai started to use clean energy for power supply for 15 consecutive days and 360 hours. All power consumption came from clean energy generated by water, solar energy and wind power generation, which once again set and maintained the world record of clean energy power supply.
It is understood that during the "green power 15" period, 1.57 million kilowatt load in Qinghai Province participated in the peak valley time period to exchange "green package", so that 370000 kilowatt peak load was transferred from night production to 9:00-12:00 operation, increasing the daily consumption of 1.1 million kilowatt hours of photovoltaic power, realizing win-win situation of large industrial users and photovoltaic enterprises, and improving the capacity of new energy consumption. This "green package" embodies the concept of green energy consumption, advocates green travel mode, and expands the local consumption level of green power.
To solve the problem of new energy consumption nearby, Qinghai not only tried "green power 15 days". In the west coast of Qinghai Province, the "3 + X" mode of exploring new energy consumption nearby has been formed. 3 refers to the government, power supply enterprises and comprehensive energy enterprises, and X refers to the new energy industry that can be expanded in the future. After the grid connected operation of new energy, Haixi power supply company provides various services for grid operation, such as peak regulation, frequency modulation, standby, black start, demand side response, etc., to promote peak load shifting and valley filling of power grid, and effectively relieve the pressure of power grid external transmission.
At the same time, distributed photovoltaic power generation projects all over the country have become an important way of local consumption in addition to large-scale wind power and photovoltaic power generation. By the end of 2018, the cumulative grid connected capacity of the state grid was 47.1 million kilowatts, an increase of 67% over the end of 2017, which not only promoted the local consumption of solar energy, but also provided a new way for local people to increase income. "After carrying out photovoltaic poverty alleviation in the village, a 3.4-kilowatt photovoltaic power generation panel was installed on the top of my bungalow, and the remaining electricity was sold through Jiangsu Fengxian power supply company, with an annual income of about 4000 yuan." Liu Zongxing, a villager in gaoliuzhuang, Wanggou Town, Fengxian County, Jiangsu Province, said happily.
In addition to local consumption, the new energy sent out must also be "accessible". In order to promote the consumption of new energy, all localities need to reasonably determine the scale, layout and timing of clean energy construction according to their own conditions and capabilities according to the consumption objectives, so that power grid enterprises can take various measures to improve the utilization rate of new energy. Taking Henan Province as an example, as a big province of new energy consumption, since 2017, Henan has purchased more than 30 billion kwh of new energy power outside the province. Dai Fei, director of the power dispatching control center of Henan Electric Power Company of State Grid, said: "Henan Province has long held a strong welcome attitude towards the introduction of foreign power, and has given high support from policy. New energy in Northwest China has been the first choice of power supply in Henan Province, increasing the amount of new energy in Northwest China and easing the contradiction of new energy consumption in Northwest China."
At present, in the new energy access areas, the company is actively exploring the demand side response, using market means to transfer demand side resources to absorb new energy electricity during the low period; the maximum use of pumped storage power stations, with an average utilization hours of 2659 hours, increases the consumption of new energy power by 31.1 billion kwh. The company has also established an overall coordination mechanism for power grid security and new energy consumption, established a hierarchical early warning mechanism for new energy constraints, and promoted coordinated and rapid response of multi-level dispatching of new energy consumption.
Source: Party group propaganda department, Yingda media group
Service