China's power industry trends

As China is a country with large energy consumption, the country places special emphasis on the development and production of energy-saving and environmentally friendly products. In the past, high-energy and low-quality power supplies will gradually be eliminated from the market, replaced by energy-efficient, high-quality power products that meet the current social development themes. This has enabled the rapid development of high-efficiency energy-saving power supplies in electronic products.

At present, China's large-scale production of power companies are mainly divided into three types: assembly companies, Sino-foreign joint ventures and independent research and development companies. Assembled companies' imported parts are assembled in the country and sold directly to foreign markets. Their products are of good quality and high cost, but their adaptability to the domestic market is poor. Chinese-foreign joint ventures use more advanced foreign technologies and their products are available in the domestic market. High reputation; independent research and development companies can produce advanced series of power products, not only can meet the needs of a variety of electronic equipment, but also widely used in aerospace, new energy and other fields.

Based on the needs of the development of the actual situation, the future development trend of China's power supply (including electronic transformers) industry mainly shows the following four characteristics:

Energy saving and environmental protection

Energy conversion efficiency is an important measure of energy saving, which is the ratio of output to input power. The higher the conversion efficiency, the less energy loss. To improve the conversion efficiency of the power supply, it is necessary to improve the power factor by controlling the energy efficiency in different modes such as standby, sleep, and idle. Reducing the power supply not only saves energy, but also reduces the temperature accordingly, thereby extending the service life of the power supply and the entire product.

high efficiency

Traditional PWM switching power supplies consume large amounts of power and do not achieve the expected benefits of high frequency and high efficiency. The power supply in the professional field greatly improves the working efficiency of the power supply by zero-voltage conduction and zero-current shutdown.

High reliability

Professional field power supply and electronic transformers extend the life of the power supply in terms of component selection and product plan. At the same time, the reliability of the power supply product can also be improved by reducing the temperature rise, reducing the electrical stress of the device, and reducing the operating current.

low noise

Ordinary switching power supplies are simply pursuing high frequencies, and noise is also increasing. The professional field power supply employs resonant conversion loop technology that can both be high frequency and low noise. However, resonant conversion technology has higher technical requirements and requires accurate control of the switching frequency.

“In the past, people’s focus was on whether the UHV could succeed. Now that we have built and successfully run the “two straight and one on the other hand” UHV demonstration project, people are beginning to focus on what role the UHV can play.” At the 3rd China Electric Power Development and Technological Innovation Academicians Forum, Huang Qili, Academician of the Chinese Academy of Engineering and Honorary Chief Engineer of the Northeast Division of the State Grid Corporation of China made the above statement.

UHV power grid has four practical significance. The UHV project first brought about the promotion of optimal allocation of energy resources, which is no doubt. Energy accumulation in the western regions of China is a reasonable way to transport energy from places with more energy sources to places with concentrated loads. UHV technology must be used to realize large-scale long-distance transmission; the second is the third generation of UHV power grids as the backbone. From the beginning of the design, the grid takes into account the situation of accepting renewable energy and grid connection. This is the practical significance of UHV promoting the development of clean energy; the third major practical significance is the need for synchronous upgrading of the equipment manufacturing industry and UHV technology. The progress of domestic equipment manufacturing industry; the fourth major practical significance is to build a large channel for intercontinental energy transmission. "For example, the Sahara Desert has abundant and developable solar energy resources, where people are sparsely populated and can't absorb so much electricity. It can only be allowed to waste. Now, with UHV, it is entirely possible to transfer energy from the Sahara to Available areas to solve human energy use problems."

China's energy resources and productivity are in reverse distribution, energy structure is dominated by coal, energy development is accelerated to the west and north, and large-scale and intensified development of wind power, solar power, etc. determines the importance of optimizing energy allocation in the country and accelerating the development of UHV. The necessity. Wind energy and solar energy are natural and inexhaustible clean renewable energy sources. The common sense of life tells us that the wind is slow, the sun is sunny, and the clean energy generated by wind energy and solar energy is volatile and intermittent. The access capacity is not only limited by the size of the power grid, but also requires the use of pumped-storage power stations. The multiple functions and flexibility make up for the randomness and non-uniformity of wind and solar power generation. All of these, UHV transmissions are economically sound and have many advantages.

The already established UHV DC project, Jinsu UHV DC project and the Xiluodu-Zhexi UHV DC project, and the Haminan-Zhengzhou UHV DC project have all proved the rationality of the UHVDC transmission mode. And economy. Obviously, accelerating the development of UHV and realizing “representing coal by electricity, replacing electricity by electricity, and electricity by electricity from afar” is an inevitable choice to solve China’s energy problems. This move not only promotes the construction of UHV cross-regional channels, but also optimizes the layout of coal and electricity. , And solve the problem of clean power consumption.