The main application research and analysis of frequency converter in power industry

In the 21st century, a new vocabulary often appears in people's mouths, which is “frequency conversion”, there are inverter air conditioners, inverter refrigerators, etc., people only understand its one function which is power saving, inverter has begun to be used in the power industry, the proportion of application The major ones are coal feeders, powder feeders, induced draft fans, primary fans, and secondary fans. The application market is very large. Among the existing technologies, frequency conversion speed regulation technology has the most obvious effect on power saving and energy saving. The proportion of energy saving is between 30% and 50%, and the cost recovery period is between six months and three years.

In 2011, the power industry, especially thermal power generation companies, attracted attention due to losses. Although there were short-lived market conditions before and after the tariff adjustment program at the end of the year, the factors that hindered its “performance” in the market were not cleared by a paper price adjustment plan. In recent years, power companies, whether they are traditional thermal power companies or clean energy power generation companies favored by policies, have often been overwhelmed by pessimism. In the final analysis, there are still many weak links in the industrial chain that have not changed: Small-scale energy structure adjustments , factor price reform can not let go. The structural adjustment of the power industry is mainly reflected in: increasing the proportion of clean energy generating installed capacity in the total generating capacity; increasing the proportion of clean and efficient generating units in the total generating units; accelerating the application of clean power generation and new energy power generation technologies; The power grid construction efforts will promote the coordinated development of power grids at all levels and enhance the ability of the power grid to allocate resources across regions.

At present, the low-voltage frequency conversion is aimed at improving the motor performance in the power industry. It belongs to a higher level of demand, so the growth rate is stable, and it has maintained a growth of 15%-20% in recent years. The low-voltage frequency conversion equipment accounts for a relatively small proportion of equipment, but its high performance requirements, so downstream companies pay more attention to the effect of the use of products, thus making the market share of foreign brands reached more than 70%. From a long-term development perspective, the growth of low-voltage inverters stems from the extension of servo systems and industrial control equipment.

At present, the inverter is mainly used in the power industry to change the amount of coal, powder, water, etc. to adapt to the changes in the load, and ultimately achieve the purpose of saving energy and improving the control of technological level, and saving energy, reducing consumption, reducing emissions, and safety of thermal power plants. The stable operation has important significance. The application of low-voltage frequency converters in the power industry mainly includes feeders such as coal feeders and feeders, and fan and pump devices such as blowers, induced draft fans, and circulating pumps, which are mid-end markets for inverter applications.