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2022
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Development Trend of Distributed Power Supply
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In recent years, distributed power supply has developed rapidly in China. State Grid Hebei Electric Power takes the southern region of Hebei as a sample, analyzes and predicts the development trend of distributed power supply, and provides reference for the construction of intelligent energy system.
China is rich in new energy resources, with large-scale development of resource conditions and technical potential. At the same time, under the common vision of strengthening global cooperation and promoting innovation, as a new economic growth point, the prospect of renewable energy industry is considerable, and it is imperative to promote the development of new energy industry.
In recent years, affected by natural conditions, the distribution structure of residents, the prevention and control of air pollution in Beijing, Tianjin and Hebei, the distributed power supply based on new energy has developed rapidly, with an average annual growth rate of more than 300. State Grid Hebei Electric Power combs the current policy, touches the development status of new energy and distributed power supply, analyzes and predicts the development trend of distributed power supply, puts forward the development proposal of new energy and distributed power supply, and provides scientific reference for the construction of new energy system.
Favorable policies boost the sustainable development of distributed power supply
The layout and implementation of the national new energy strategy and the formulation and release of relevant policies have consolidated the institutional guarantee for the construction and promotion of distributed power supply, and promoted the rapid development of distributed power supply, showing the trend of "multi-faceted and local high-density grid connection. In the past three years, the average annual growth rate of distributed power in China has exceeded 100 percent.
In 2017, the National Development and Reform Commission and the Energy Administration jointly issued a number of documents, including the notice on carrying out pilot market-oriented trading of distributed power generation, and officially launched the pilot construction of market-oriented trading of distributed power generation. The Hebei Provincial Government responded positively and issued the "Notice on Carrying out the Pilot Market-oriented Trading of Distributed Photovoltaic Power Generation", formulated the implementation rules for the market-oriented trading of distributed power generation, and made detailed regulations on the scale and trading methods of power stations that can participate in the pilot market-oriented trading. Co-ordinate access and consumption capacity and other factors, distributed photovoltaic power generation resources and sites are mainly selected in the southern region of Hebei, which can not only be consumed nearby, but also guarantee the yield of distributed photovoltaic power generation market-oriented transactions. It is expected that the follow-up pilot selection will give priority to areas with surplus capacity.
As one of the "ten targeted poverty alleviation projects" of the Poverty Alleviation Office of the State Council, photovoltaic poverty alleviation has realized the organic combination of poverty alleviation and development, new energy utilization, energy conservation and emission reduction. The Guiding Opinions on the Implementation of the Thirteenth Five-Year Plan for the Development of Renewable Energy issued by the National Energy Administration put forward new construction indicators for photovoltaics. Most provinces, such as Shandong Province, Hebei Province, Shanxi Province, and Inner Mongolia Autonomous Region, will add new construction. All indicators are used for photovoltaic poverty alleviation projects.
New technology and new model will change the development trend of distributed power supply
New technologies will lead the development of distributed power. In the distributed power supply network, the energy storage device can smooth the output power of the power supply through appropriate charging and discharging, thereby reducing the impact or fluctuation when the distributed power supply is connected. The combination of distributed generation and energy storage technology will greatly improve the energy efficiency and economy of the system.
In addition, the application of intelligent grid-connected technology plays a role in promoting distributed power supply. When a large number of clean energy is connected, the power supply and load using virtual synchronous machine technology can independently participate in the operation and management of the power grid, and have the same operation mechanism as the synchronous unit to resist the interference of external disturbances to the synchronous system.
The optimal layout and flexible and efficient grid connection of distributed power supply is one of the important tasks for the development of green energy in Xiongan New Area. Hebei South Network will take Xiong'an New Area as the lead, drive the construction of the energy system of the new area with technological exploration and breakthrough, and improve the energy system mechanism of the new area with the innovation and iteration of thinking. Xiongan New area will become an incubator and experimental field for new energy and distributed power technologies, new management and new models, so as to establish an energy system with clean and low carbon as the development direction, electricity as the center and smart grid as the configuration platform.
The new model will stimulate new kinetic energy of distributed power supply. The flexibility of the power grid is the core of new energy consumption, and the power auxiliary service is one of the means to improve the flexibility of the power grid. In November 2017, the National Energy Administration issued the Work Plan for Improving the Compensation (Market) Mechanism for Power Ancillary Services, proposing to achieve full coverage of power auxiliary service compensation projects, encourage energy storage equipment and demand-side resources to participate in the provision of power auxiliary services, and allow third parties to participate in the provision of power auxiliary services. In the long run, auxiliary services will serve as a breakthrough for large-scale energy storage to participate in power grid regulation, and become a new driving force for the rapid development of new energy, energy storage and other industries.
Building a safe, reliable, intensive, efficient, clean and low-carbon smart energy system
In view of the rapid development of distributed power supply, it is necessary to use advanced information technology and intelligent management technology based on traditional energy system, integrate meteorological data and power grid data, carry out big data analysis, deeply couple information system and energy system, realize coordinated development, integration and complementarity of "source-network-load-storage", and build a safe, reliable, intensive, efficient, clean and low-carbon intelligent energy system.
Source: Enhance the application of virtual synchronous generator technology. Virtual synchronous machine includes fan, photovoltaic, energy storage virtual synchronous machine, etc., the application mode of this technology is mainly new energy grid, flexible DC transmission and so on. Wind power virtual synchronous machine, it is recommended to use rotor kinetic energy release control strategy, that is, in the main control system of wind turbines to add virtual synchronous generator function algorithm, after the operation of the regional power grid with thermal power, hydropower FM coordination control, in order to reduce the risk of secondary disturbance of the grid frequency. Photovoltaic virtual synchronous generator, it is recommended to use the analog rotor motion equation control strategy, recommended lithium battery as an additional energy storage unit battery selection, after the operation should further improve the parameter settings, enhance the photovoltaic virtual synchronous generator FM support capacity. Energy storage virtual synchronous machine, it is recommended to configure power station virtual synchronous machine for fans and photovoltaic inverters, recommend full-power converter and use voltage control topology, key control parameters need to be optimized to avoid risks such as low frequency oscillation.
Network: Demonstrate the development of new energy grid-connected real-time monitoring. Based on the evaluation perspectives of investors and power grid enterprises, we explore and carry out special monitoring of new energy grid connection, establish a "government-power grid-enterprise" tripartite linkage mechanism, take wind power and photovoltaic power stations as the main monitoring objects, deeply sort out the value and risk points of new energy grid connection in the aspects of grid connection implementation, power station operation and effectiveness evaluation, and according to the dimensions of region, new energy type, access voltage level, grid connection time and consumption mode, from seven aspects: new energy grid-connected scale, new energy power station operation and revenue, new energy power station grid-connected efficiency, new energy substitution power benefit, new energy consumption, new energy grid-connected adaptability, and distributed power supply selling to power grid, the situation of new energy and distributed power supply is systematically monitored, and then the development and operation status of new energy are visually displayed layer by layer, providing scientific reference for planning, power grid operation and maintenance, industry development and even government decision-making.
Lotus: A study of shared internet thinking load management. To implement the construction and deployment of "three types and two networks" of the State Grid Corporation of China, according to the work requirements of "building a shared enterprise" and relying on technical means such as big data, the comprehensive development of source network, load and storage will be coordinated, and the power grid will be taken as the carrier to promote a more accurate linkage between load, power supply and energy storage, so as to achieve overall economic optimization and increase the proportion of new energy consumption. Create more friendly interface ports, activate user interaction, guide users to consume appropriately in peaks and valleys, and attract the latter to join power peak shaving and new energy power consumption, so as to improve the overall consumption capacity of new energy, ensure the economic operation of the power grid and improve customer satisfaction.
Storage: Continue to promote the in-depth application of energy storage technology. Energy storage technology is one of the indispensable supporting technologies for the development of energy Internet and distributed generation. In the application of the main network, the construction of a certain capacity of energy storage device in the appropriate location of the power grid can cut the peak and fill the valley, improve the security and stability of the power grid.
It is predicted that after 2020, the commercial application of large-scale energy storage projects will be economically feasible, and lithium-ion batteries and all-vanadium redox flow battery technologies will be recommended first. In terms of distribution network application, the reliability of power supply on the power distribution and power consumption sides can be improved by setting different levels of distributed energy storage devices on the power distribution side or the user side. At the same time, the deep combination of distributed energy storage and electrolytic hydrogen production technologies can improve the ability to accept distributed power sources and open up broader development and service space for rural clean heating and user-side load control. In terms of energy structure, the role of energy storage devices as a support platform for efficient conversion and space-time transfer and utilization of different energy forms in the energy Internet is more prominent, providing new possibilities at the level of organic interconnection of power generation side, demand side, auxiliary services and transmission and distribution networks, which can drive the development of related industrial chains and form a virtuous circle.
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