Analysis on the current situation of domestic medi

Analysis of the current situation of domestic medium voltage inverter manufacturing

editor's note: the market prospect of medium voltage inverter is good, but the road is not easy. If you want to do medium voltage inverter as a career, you need to carefully investigate and do a good job. In the first three years, only the investment has no return. The fatigue fracture is obviously divided into two areas: the relatively smooth crack expansion area and the relatively rough fracture area. If you want to prepare, you'd better enter this industry

1. Current market situation

according to the situation of China's economic development, the four hot issues restricting China's economic development are oil, electricity, coal and transportation. Coal transportation electricity is an economic chain of mutual restriction and coordinated development. Therefore, in the next few years, the work of energy conservation, electricity conservation and environmental protection will be mentioned on the work agenda of the government, and more importantly, it will be mentioned on the work agenda of enterprise groups. For thermal power, metallurgy, petrochemical and other industries, power saving is also coal saving, environmental protection, and one of the effective ways to reduce costs. Therefore, the tide of energy conservation will gradually come, and it will also provide a market opportunity for the manufacturing industry of medium and high voltage frequency converters (including imported and domestic). Therefore, many enterprises are investigating, developing and pilot producing medium voltage frequency converters

2. Characteristics of Chinese enterprises

in this land of China, over the past 20 years of reform and opening up, a trend has formed:

no matter which industry, as long as it is considered to have a good market prospect, it will be profitable in the short term. Everyone's eyes are focused on this industry. Let's work together. Once the most obvious ones were China's color TV, refrigerator and VCD industries

metallurgy, electrolytic aluminum and power plants are the new and most typical industries. In state-owned enterprises and private enterprises, the result is that the output will far exceed the demand in a very short time. According to the concept of economics, it is good for enterprises' competition and development that the output exceeds the demand by 20~30%, and it is undoubtedly a disaster for the industry that the output exceeds the demand by 100~200%

3. Characteristics of the power electronics industry

China's power semiconductor devices only stay in the technology of power diodes, thyristors and GTOs, and there has been no major development in recent years. At present, MOSFET, IGBT and IGCT, which are widely used in power electronics, are completely dependent on imports

due to the lack of domestic advanced power electronic devices, the development of China's power electronics industry has been severely constrained, and more than 90% of the market has been occupied by imported products. The power electronics industry has the following characteristics

(1) in the power electronics industry, the smaller the power and the lower the voltage, the more manufacturers produce; The higher the power and voltage, the fewer manufacturers are produced

at present, there are many manufacturers of low-voltage frequency converters, such as Siemens, abb, Schneider, Danvers, Toshiba, Hitachi, Fuji, AB, Mitsubishi, etc

at present, only AB and robinham in the United States do better in medium voltage converters. Japan requires sufficient capacity and guarantees the rapid heating up of Toshiba, Siemens in Europe, etc

(2) high technical content

power electronics is a new interdisciplinary discipline, which includes three major electrical engineering technologies: power, electronics, and control users can report in any format according to their needs. With the development of technology, it is closely related to modern control theory, material science, electrical engineering, microelectronic technology and many other fields

(3) high development cost

power electronic products, especially high-power products, require a large number of high-precision equipment and instruments in the development. In addition, because the internal micro phenomena of power semiconductor devices (IGBT) cannot be observed by conventional means, sudden damage often occurs in the application process. Only by constantly exploring and gradually mastering its rules can it be well applied, and the accumulation of these experiences requires a large amount of capital investment. At present, IGBT explosion often occurs in the use of some domestic medium voltage inverters

4. Conditions that must be met to enter the medium voltage inverter manufacturing industry

(1) ideological preparation

long development cycle and large capital investment of power electronic products require a hard and protracted war

if you just want to make a profit and get high returns in the current wave of energy conservation, you'd better be a product sales agent. If you want to take the medium voltage inverter as a career, you need to make careful research, and be prepared for the first three years of investment without return, otherwise you'd better not enter this industry

(2) talent preparation, especially the preparation of high-tech practical talents

the accumulation of practical experience of scientific researchers in the power electronics industry is more important than any aspect. If you think that there are several master's and doctoral students, they will quickly develop products and do them perfectly and reliably, then there will not be only Siemens, Toshiba, GE and AB in the world, so the process, system The accumulation of technical experience is very important