Sunpower Solar energy and heat plus

On July 7, 2016, the “Implementation Opinions of the National Development and Reform Commission and the National Energy Administration on Promoting the Construction of Multi-energy Complementary Integrated Optimization Demonstration Projects” was officially issued, and the declaration of multi-energy complementary integrated optimization demonstration projects nationwide was officially launched. In February 2017, the National Energy Administration issued the “Notice of the National Energy Administration on the publication of the first batch of multi-energy complementary integrated optimization demonstration projects” to publicize the first batch of multi-energy complementary integrated optimization demonstration projects. The notice shows that the first batch of multi-energy complementary integrated optimization demonstration projects have arranged 23 projects, including 17 integrated terminal energy supply systems and 6 multi-energy complementary systems.

This document has also promoted the development and progress of solar energy in the field of multi-energy complementarity. Qinghai Province provides solar energy-based energy solutions to solve scientific research results. It has been promoted and applied in Xining, Qinghai, Shandong and Tibet, and has won unanimous praise from users. Recently, this scientific and technological achievement has passed the acceptance of the High Technology Center of the Ministry of Science and Technology.

Figure1 Sunpower solar

The scientific and technological achievements of the research on the key technologies of the multi-energy comprehensive utilization micro-grid system based on solar energy have developed and completed the multi-energy comprehensive utilization micro-network system planning and design software, and built the solar light-heat utilization. The multi-energy comprehensive utilization experimental simulation system breaks through the coupling design integration technology of community-level multi-energy comprehensive utilization cogeneration system, overcomes the optimization design and operation control technology of solar heating system suitable for rural areas, and develops community-level energy management. The distributed collaborative energy management system for home energy management has built the first domestic rural community 100% renewable energy cogeneration micro-energy system in the rabbit village of Wuerqin County, Xining City.

Luneng Haixi Multi-energy Complementary Integration Optimization Demonstration Project is the first multi-energy complementary technology innovation project in the country's first multi-energy complementary integration optimization demonstration project, with a total installed capacity of 700,000 kilowatts, including 200,000 kilowatts of photovoltaic projects. 400,000 KW wind power project, 50,000 KW solar thermal power project and 50,000 KW energy storage system, planning and building into a world-leading multi-energy complementary and intelligent scheduling of “wind, light, heat, storage, regulation and load” The pure clean energy comprehensive utilization innovation base. After the completion of the project, the annual power generation will be about 1,262.5 million kWh, saving about 401,500 tons of standard coal per year, which will effectively reduce coal consumption and reduce air pollution.

In the development of the solar thermal utilization industry, Sunpower solar energy plus multi-energy complementation has always been the focus of development. Whether it is hot water engineering or heating and heat storage engineering or even the current wall-mounted solar energy, solar energy and electricity, air source heat pumps, gas wall-hung boilers, ground source heat pumps and even the Internet are used to meet people's various needs. Especially in the field of solar heating, this combination is even more demanding due to the time difference in heating time.

Since October 2017, the National Development and Reform Commission and other 10 ministries have jointly issued the winter clean heating plan for the northern region in the next five years, and launched a series of clean energy heating measures across the country. In 2018, Hebei, Shandong, Shanxi and other places have introduced relevant heating policies. In 2018, Hebei carried out research on new technologies of “solar light + auxiliary energy” and “photovoltaic + electric heating”, and selected technical experts to conduct field research on “solar light heat + auxiliary heat source” and “solar photovoltaic + heat source” and other new heating modes, science Prepare a series of special topics such as “Study on Clean Heating Methods in Rural Areas of Hebei Province” and “Analysis of Applicability of Air Source Heat Pumps and Ground Source Heat Pumps”, according to the characteristics of building functions, heat load demand and solar energy supply, comprehensive electric heat conversion rate and energy consumption. And the actual situation of farmers, and the development of a reasonable and appropriate new electric heating technology program. In July, Hebei Province issued the "North Hebei Province clean heating implementation plan" clear, in 2018 in the province pilot photovoltaic +, light and heat +8500 households.

In May 2018, the Office of the People's Government of Yanqing District, Beijing issued the “Implementation Plan for Winter Clean Heating Work in Villages in Rural Areas of Yanqing District in 2018”, stating that by the end of 2018, Yanqing District completed the completion of households and village committees and villagers in 46 rural areas. The task of “coal to clean energy” in public places and seed agricultural facilities. Rural households install solar heating facilities in their own houses and village collectives on public buildings. The municipal government's fixed assets investment provides 30% financial support for solar heating system construction investment, and auxiliary subsidies for heat sources (heat pump, electricity, gas, etc.) The policy is implemented in accordance with the current municipal government's fixed asset investment policy.

However, there are still many problems on the road of complementary solar energy. First of all, multi-energy complementation is not a simple energy type superposition, but to achieve the effect of "1+1›2". Some solar thermal engineering designers pointed out that the so-called complementary and energy-saving, it is not necessary to ensure the ratio of solar energy, but the rational design of the entire system, the full use of energy. Many systems in our country require energy savings of more than 70% to be energy-saving. This is unscientific. Some solar energy and other energy complementary projects in Europe, many projects have a solar guarantee rate of less than 70%. Secondly, in terms of energy mix, there are some phenomena in the actual project that are dominated by the second generation. The main reason is the price of the product. Taking solar energy and air source heat pump as an example, many companies report that because air source heat pumps are lower in the early market, some solar energy heat pumps are used as the main energy source, while solar energy is the auxiliary energy source. This phenomenon seems to be lower in initial installation costs, but in the later stages of operation, users pay more for the purchase. In addition, it is also subject to the initial installation cost problem, and the utilization rate of the system is also problematic. There is a corporate response. The problem of low solar energy utilization due to the initial installation problem directly affects the user experience, which is one of the reasons why solar heating is “marginalized”.

However, it is undeniable that accelerating energy transformation, building a modern energy system, and developing new energy sources are inevitable choices for China. In the future development of energy, the establishment of an integrated energy system with multiple energy integration, integration and complementarity has become a trend of energy transformation. In this trend, the complementary cooperation between solar energy and other energy sources will certainly be one of the mainstream, as long as Grasping this trend firmly and working hard for it, solar energy will surely present a blue development prospect!

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