博文

The current situation of the development of Chinese solar inverter industry

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Solar inverter is one of the power supply, and its production process and the required components is quite same to UPS, communication power supply and so on, China solar inverter industry is still in the early stages of development, but the develop rapidly. According to statistics, Chinese solar inverter shipments reached 22.8GW in 2016. In 2016, The market of distributed inverters has become hot, inverter oligarchs also began to enter the distributed inverter market, launched a lot of small inverters. In 2016, centralized inverter market accounted for 62%, string inverter market accounted for 32%, the next string inverter, the proportion will continue to increase, to 2020 string inverter market share or to 45%. As the industry is in the early stage of development, its competition pattern is not stable, there are many domestic solar inverter manufacturers, but the scale is generally small. However, in the domestic solar inverter market, Chinese manufacturers occupy the dominant positi…

Complementarity of wind energy and solar energy resources

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Solar energy is the source of all the energy on the earth, and the sun shines on every part of the earth. Wind energy is another form of solar energy on the surface of the earth. Due to different forms of the earth’s surface (such as sand, ground, vegetation, ground and water), the absorption coefficient of solar radiation is different, resulting in the formation of temperature difference on the ground surface, and then the formation of air convection wind energy. Therefore, wind energy and solar energy have strong complementarities both in time and in seasons: During the day, the sun shines well, the wind is small, at night there is no light, the wind is stronger; In summer, the intensity of the sunlight is large and the wind is small, and the sunlight intensity is weak and windy in winter. The wind energy and solar energy resources in Inner Mongolia also have such complementary characteristics. The wind energy and solar energy resources in a certain place in Inner Mongolia are used…

Principle and application of 48V DC power supply

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48V DC power supply is a kind of electronic equipment which transforms the low frequency power grid into a special form of high voltage power supply. The 48VDC power supply can be divided into positive polarity and negative polarity according to the polarity of output voltage. 48V DC power supply has been widely used in various industries, can also be used in the field of agriculture, such as electrostatic dust, electrostatic spraying, electrostatic spraying agricultural material wrapped in agricultural products processing, agricultural and biological effect of electrostatic flocking research, electrostatic sterilization, electrostatic agricultural seed processing and so on. With the development of agricultural science and technology, agricultural scientific research and agricultural engineering application of high voltage electrostatic power demand is increasing year by year, have put forward many new requirements for the accuracy, performance, specifications, varieties, types, volum…

UPS with silicon carbide is more energy saving and high efficiency

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The economic mode of UPS has great advantages, but the latest development of silicon carbide technology could offset the economic advantages of the mode, the transistor is the traditional silicon controlled device for UPS, insulated gate bipolar transistor (IGBT) function more and more powerful and reliable. The UPS with IGBT device has an obvious disadvantage, the faster the switching speed is (to obtain higher accuracy), the higher the power loss. This is mainly because the upper limit of the module efficiency is 96.8%, and the efficiency of the dual conversion UPS can be increased to 98%~99% theoretically by using SiC devices. The synthesis of silicon carbide powder has been mass production since 1893, the initial cost of manufacturing IGBT by using silicon carbide is very high, but the energy-saving effect is very significant, and all these are not the key to the power grid load transfer, will not increase the risk of power conversion. At the module level, silicon carbide has two…

Application example analysis of medical power supply

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There have been customers bought a low-cost medical grade UPS, the power supply is 5V 200mA, hundreds of batches of the unit price is $5.
The device sells tens of thousands of dollars. The surprisingly low price of power seems pretty good. After opening this power supply, it is found that it has only one single-sided printed circuit board. In order to save the cost, the circuit board has no metallized through-hole. The circuit board adopts the surface mounting structure, and the component density is very large. The component spacing does not meet the requirements and design criteria of creepage distance specified by medical power supply and related safety management institutions. Leakage current up to 900mA, far beyond the specification limit. The creepage distance and the gap voltage can not reach the voltage used in the general power supply. The spacing between the high pressure regions is only 0.5mm, and the flux resistance is used to improve the dielectric resistance. The pin spac…

Safety, speed and cost benefit of solar inverter

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Solar energy is no longer an emerging technology, but a technology that is undergoing major technological changes. As we move toward grid parity (The cost of solar energy is equivalent to that of traditional power generation) and improving traditional energy generation types, because the process of converting direct current into usable alternating current in the panel becomes more efficient and affordable. However, although the solar panel prices have decreased significantly in recent years, the next development of solar energy development will be driven by the new technology of power converter system. The rise of multistage power switch topology sophisticated will be based on silicon carbide (SiC) and gallium nitride (GaN) materials, coupled with higher operating voltages (up to 1600 VDC), the power switch more quickly, compared with the traditional system, the performance will be greatly improved. Higher switching frequency means that the passive components of the power converter, …

Solar hybrid grid tie inverter development prospects

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From the perspective of photovoltaic development, the grid connected system installed capacity will occupy 90% of the market, the establishment of large power plants, rooftop solar energy applications is the main direction of development of photovoltaic industry. But with the future power generation costs reaching the level of conventional hydropower and thermal power costs, the proportion of off grid applications will increase. At present, the hybrid on grid inverter is the focus of development for all manufacturers, and its technical indicators represent the level of solar inverter technology. However, since 2007, the selection of hybrid grid tie inverter installed in foreign grid connected soalr power generation system became more and more inclined to miniaturization, intelligent, modular development, the use of small soalr hybrid on grid inverter has become the development trend of soalr grid. The reason is the rise of large-scale foreign PV systems market, from small household p…