From January to July this year, the company's operating area cumulatively consumed 346 billion kWh of new energy, up 15.3% year-on-year, of which wind and photovoltaic volume was 294.92 billion kWh, utilization rate reached 96.3%, up 2.5 percentage points year-on-year. 2019 is the tough year for promoting new energy consumption. As the largest grid for accessing new energy sources in the world, how can the national grid continue to improve its new energy consumption capacity?
New technology and new mechanism effectively guarantee 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 operations, market transactions, and technological innovation. It has achieved remarkable results.
In order to better meet the high-energy access requirements of new energy, the company has overcome the virtual synchronous machine technology, ±500 kV flexible DC grid, low-carbon winter Olympic smart grid, electric vehicle intelligent interactive charging and other projects are also growing up, significantly improved The safe and stable operation level of the power grid meets the requirements of intelligent, controllable and flexible requirements for the new generation of power systems, ensuring the friendly relationship between new energy and large power grids.
Nowadays, in many areas, new energy companies have already experienced the high-quality new energy grid-connected services of the State Grid. Xinjiang Hami Power Supply Company provides a one-stop service for new energy companies in the whole cycle of grid-connected and commercial-transportation in the first comprehensive energy base in Hami, Xinjiang, which is the largest “Landscape Thermal Power” in the country. At the same time, advanced control measures are used to optimize the active output of the wind farm to achieve full coverage of the new energy automatic power generation control system (AGC). In Yinchuan, Ningxia, professionals use low-voltage locals in areas with dense power load and strong grid grid. The access method realizes the in-situ consumption of 8 wind farm electric powers, and adopts high-voltage centralized access to the Internet in areas where wind power is dense and the power load is small, realizing large-scale resource optimization configuration.
The company advocates that in the process of promoting the new energy consumption, accelerate the implementation of the flexible transformation of thermal power units, and strive to complete the transformation scale of 40 million kilowatts or more in 2019; standardize the construction and operation management of coal-fired self-supplied power plants, and connect the coal-fired self-supplied power plants with The utility plant is managed equally, obeys the unified dispatch of the power grid, assumes the peaking obligation and corresponding social responsibility; enhances the network performance of the new energy field station, and provides support for the high-energy access and operation of the new energy.
The company's promotion of ubiquitous power IoT construction will also help boost new energy consumption, explore the establishment of a long-term mechanism for service new energy development, promote the coordinated development of source network and load; develop and build a new energy big data management platform, focusing on the company's core business, Focusing on the government's social concerns, focusing on customers, focusing on the role of value, to meet the needs of the main body of all parties, to improve the efficiency and service level of the entire chain of business, to provide support for the high-quality development of new energy.
UHV transmission channel helps large-scale consumption of new energy
Sitting in the home of Hunan, it uses solar power from Gansu; the wind power in the three northeastern provinces, through Tongliao in Inner Mongolia, instantly lights up the lights of Shandong's Wanjia... Today, many people can enjoy the three North without leaving home. The clean electric energy in the (Northeast, Northwest, and North China) regions, and the construction of cross-provincial trans-regional transport channels for clean energy have become an important reason for the continuous improvement of abandonment of wind and light in China.
The installed capacity of new energy in Gansu Province in the Sanbei area has grown rapidly, but its own consumption is limited. The power grid has lagged behind due to factors such as long approval period, which led to the phenomenon of abandoned wind and light. Since the "Twelfth Five-Year Plan", Gansu's domestic power grid has invested a total of 76 billion yuan, built a 750 kV first and second channel and a series of 330 kV delivery projects, which greatly eliminated the "card neck" problem of the power grid. In August 2017, the world's first Jiuquan, which is mainly based on the transmission of new energy, was completed and put into operation in Hunan's UHV DC project, which made a great contribution to Gansu's new energy delivery.
“Our wind farms have gradually improved from the beginning of 2016, and the power generation has increased rapidly. In 2018, the power generation exceeded 160 million kWh, which changed the situation of years of operational difficulties, and the business operation turned from loss to profit.” July 20 Wang Xiaoming, general manager of Guocai Baiyin Wind Power Co., Ltd., Qi Caitang Wind Farm, said in Pingchuan District, Baiyin City, Gansu Province.
Not only Gansu, but also the continuous promotion of UHV power grid construction projects across the country, giving full play to the role of grid resources allocation, effectively improving the ability of new energy delivery, and boosting the national clean energy science quality development. At 3 o'clock on June 4, the Xiong'an-Shijiazhuang 1000 kV AC UHV transmission and transformation project was put into operation, and the already established Ximeng-Shandong, Mengxi-Tianjin South and other UHV projects formed a world in the Beijing-Tianjin-Hebei region. The first UHV AC double loop network laid the foundation for 100% clean power supply in Xiong'an New District and energy security in North China. This year, the company will speed up the construction of transmission channels such as Zhangbei-Xiong'an High-voltage Exchange, Qinghai-Henan, Yazhong-Jiangxi, Shaanxi-Wuhan UHV DC and Zhangbei Flexible DC to meet the needs of new energy projects for access and delivery.
The construction of UHV transmission channels provides a new path for the large-scale consumption of clean energy through “marketization” means. Among them, the Beijing Electric Power Trading Center played an important role in actively promoting the clean-up of new energy provinces. It also launched special market transactions for power generation rights, promoted the replacement of conventional energy sources with clean energy, and replaced the new thermal energy in the northwest to replace Shandong thermal power, Gansu in China, and Sichuan hydropower. Clean energy power generation transactions such as Qinghai Thermal Power, Ningxia Self-supplied Power Plant and Hunan Power Plant.
The continuous advancement of the power marketization process has improved the level of consumption in the northwestern new energy power generation provinces. Taking the Gansu Power Grid as an example, in 2018, the State Grid Gansu Provincial Electric Power Company completed the replacement of electricity by the self-supplied power generation power generation, and completed the replacement of electricity of 3.336 billion kWh throughout the year, through the northwest regional replacement, short-term real-time and Ganxin mutual economic transactions. Multi-issue new energy power 445 million kWh; through direct transactions in the province, complete the direct trading of new energy users 268 million kWh, on-site consumption of trading capacity of 92 million kWh; especially through the active development of surplus new energy cross-province Spot trading in the area, the completion of trading power of 3.249 billion kwh, accounting for 46.7% of the total amount of national network transactions, accounting for 12% of the total energy generation of new energy in Gansu Province.
“In order to better promote the consumption of new energy, Gansu's spot market mechanism is closely designed. Combined with the characteristics of large installed capacity and high proportion of new energy sources in Gansu Power Grid, the construction of electric power spot market in line with Gansu characteristics. Can not absorb new energy in the province. When there is a phenomenon of abandoning wind and abandoning light, organize new energy companies to participate in cross-regional spot transactions, and carry out cross-provincial spot transactions and clearance for new energy-limited peak energy in the province.” State Grid Gansu Provincial Electric Power Company Power Dispatching Control Center Pang Wei, director of the regulation department, said.
Multi-party coordination and promotion of new energy consumption
From 0:00 on June 9 to 24:00 on the 23rd, Qinghai started to use clean energy for 15 consecutive days and 360 hours. All electricity comes from clean energy generated by water, solar energy and wind power. It refreshes and maintains clean energy supply. World record.
It is understood that during the “Green Power 15th” period, the 1.57 million kilowatts load in Qinghai Province participated in the “green package” during the peak-to-valley period, which shifted the peak load of 370,000 kilowatts from night production to 9:00-12:00. Increase the daily consumption of photovoltaics by 1.1 million kWh, achieve a win-win situation for large industrial users and PV companies, and improve the ability to absorb new energy. This “green package” reflects the concept of green energy use, advocates green travel modes, and expands the level of green power consumption on the spot.
To solve the problem of new energy consumption, Qinghai not only tried "green power 15th". In Haixi, Qinghai, the “3+X” model for exploring new energy sources has been formed. 3 refers to the government, power supply companies, and integrated energy companies, and X is a new energy industry that can be expanded in the future. After the new energy is connected to the grid, Haixi Power Supply Company provides various services such as peak shaving, frequency modulation, standby, black start, and demand side response for the grid operation, which promotes the peaking and valley filling of the power grid, effectively alleviating the pressure on the grid.
At the same time, distributed photovoltaic power generation projects across the country have become an important way to eliminate local large-scale wind power and photovoltaic power generation. At the end of 2018, the State Grid's cumulative access to distributed photovoltaic power generation capacity of 47.01 million kilowatts, an increase of 67% over the end of 2017, not only promoted the full-scale consumption of solar energy, but also provided a new path for local people to increase revenue. “After the photovoltaic poverty alleviation in the village, 3.4 kW photovoltaic power generation board was installed at the top of my house. The remaining electricity was sold through Jiangsu Fengxian Power Supply Company, and the annual income of 4,000 yuan was achieved.” Villagers of Gao Liuzhuang, Wanggou Town, Feng County, Jiangsu Province Liu Zongxing said happily.
In addition to local consumption, the new energy that is sent must also be “received”. In order to promote the consumption of new energy, all localities need to properly determine the scale, layout and timing of clean energy construction according to their consumption targets, combined with their own conditions and capabilities, and the power grid enterprises can take measures to improve the utilization rate of new energy. Taking Henan Province as an example, as a new energy-consuming province, since 2017, Henan has purchased more than 30 billion kWh of new energy sources outside the province. Dai Fei, director of the Power Network Dispatching Control Center of Henan Power Company, said: "Henan has long been welcoming the introduction of foreign power, giving high support from the policy, and using the new energy in the northwest region as the first choice for Henan's power supply, increasing the northwest region. New energy sources will alleviate the contradiction between new energy sources in the Northwest."
At present, in the new energy access area, the company is actively exploring the demand side response, using market means to call demand side resources, and eliminating new energy sources during the low valley period; maximizing the use of pumped storage power stations, the average utilization hours is 2659 hours, increasing The consumption of new energy is 31.1 billion kWh. The company also created a coordinated coordination mechanism for grid security and new energy consumption, established a new energy-restricted grading early warning mechanism, and promoted rapid response of multi-level dispatching synergy for new energy consumption.