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Frequency Converter: "The 13th Five-Year Plan" Still Walks the Way of Speed Regulation and Energy Saving

发布者:总管理员时间:2019-07-29 13:38
Frequency converter is an important component of industrial control system. It is installed in the front end of the motor to achieve speed regulation and energy saving. The rear end of the high-voltage converter mainly drives the loads of fans and pumps, and the actual power-saving effect reaches 30%~60%. In the future, the market development of the industry will benefit from the transformation of large and medium-sized projects. The low-voltage converter, together with the control and executive equipment, will form an automatic control system, and its future development will benefit from the "equipment upgrade" of the manufacturing industry.
High-voltage frequency converter can be divided into general purpose and high-performance. At present, domestic enterprises in general field occupy more than 80% of the market share. The fierce competition has led to a sharp decline in prices in 10 years. The high-performance market is still dominated by foreign capital, with gross profit about 50% higher than that of general purpose products, which will become the main direction of domestic enterprises in the future.
The downstream of low-voltage frequency converter is mainly industrial control equipment in manufacturing industry. The growth rate affected by the financial crisis in 2009 was less than 5%, which reached 30% in the first three quarters of 2010. It is expected to maintain a steady growth rate of 15% in the next five years.
Foreign investment accounts for more than 80% of the high-end market of low-voltage converters, and Huichuan Technology and Yingweiteng are the leading domestic enterprises. Compared with foreign-funded enterprises, domestic leaders are in the stage of transition from providing single frequency converter products to providing comprehensive solutions. In the future, market share and profitability are expected to increase both.
Development of Frequency Converter from "Speed Regulation" to "Energy Saving"
Frequency conversion technology was first used for stepless speed regulation of motors. By controlling the on-off of semiconductor devices to change the output frequency, the soft start, frequency conversion speed regulation and operation accuracy of back-end AC motor were realized, and the protection of over-current, over-voltage and over-load was realized.
Compared with the past mechanical speed regulation mode, the frequency conversion speed regulation range is wide, reaching 100%~5%; the control precision is high, reaching (+0.5%); because it is infinite speed regulation, it can realize the soft start of the motor and the full automatic control of the whole production system, thus reducing the impact on the power grid.
In terms of voltage classification, the converter developed for motors operating in high voltage environment of 3kV~10kV is generally called high voltage converter, while the low voltage converter whose input voltage is not higher than 690V is called low voltage converter.
At present, China's high-voltage converters are widely used in the fields of power, metallurgy and cement, accounting for more than 50%. Low-voltage converters are more widely used, involving industrial production, petroleum, coal, municipal transportation and other industries. High-voltage frequency conversion downstream market segments.
High precision and wide range make frequency conversion the first choice of industrial speed regulation
At present, vector control is used in the field of low voltage and high performance high voltage frequency conversion. Compared with V/f control, vector control improves the speed range and control accuracy significantly.
There is still a gap between the level of industrial production automation in China and that in developed countries. The 12th Five-Year Plan puts forward "transforming and upgrading manufacturing industry", in which "developing advanced equipment" and "promoting manufacturing industry from big to strong" become the direction of future development. Frequency conversion technology will be further promoted in the field of industrial speed regulation and precision control because of its excellent performance. Especially the low-voltage frequency conversion technology which is widely used in manufacturing industry is closely related to the future development of automation transformation and equipment upgrading.
Frequency Conversion Technology Helps Energy Conservation and Environmental Protection
In order to meet the highest power requirement in operation, the main motor equipments in our country, such as fans, pumps, air compressors and so on, often have great redundancy in the design of output power. If the energy of mechanical speed regulation is used, it will be wasted on valves and dampers. Frequency conversion technology through power electronic control to complete speed regulation, in the rear drive motor to increase the range of speed change, high frequency effect is more obvious. Fan and pump loads are most suitable for installing frequency converters to save energy. Compared with low-voltage frequency conversion, high-voltage technology is more widely used in subdividing industries.
Relevant experts compared the effects of several main energy-saving products in electrical equipment, among which the efficiency of the frequency converter is as high as 30%~60%. When used, only the front end of the motor needs to be installed, so that the original equipment can be changed slightly.
The two main driving forces to promote the development of China's frequency converter industry are industrial automation transformation and energy saving and environmental protection promotion, and frequency conversion technology is also in the process of transformation from "speed regulation" to "energy saving".
The 12th Five-Year Plan put forward the upgrading of manufacturing equipment and industrial energy saving and environmental protection, and established that the future development of the industry will still follow the path of "speed regulation and energy saving simultaneously". Subdivided into products, it is expected that the main line of low-voltage converter is automation transformation and import substitution, and domestic enterprises will focus on the development of control and drive technology; high-voltage converter relying on national energy-saving and environmental protection policies, the downstream is still dominated by large-scale industrial equipment transformation such as power, metallurgy, cement, etc., and the intensification of competition will stimulate high-performance product countries. Production and production speed up.
High Voltage Frequency Conversion - Energy Saving and Environmental Protection Pull the Growth Rate to Maintain 30%
High-voltage frequency converter is mainly used in the front-end of large-scale industrial equipment motor. After long-term research and development and market development, domestic brands have occupied more than 80% of the common type. Considering that the energy-saving efficiency can be greatly improved by only revamping the motor, it is predicted that the industry will continue to maintain a growth rate of about 30% during the 12th Five-Year Plan period.
Every year 102 million kW high voltage motors are in wasteful operation and have great potential for energy saving.
According to statistics, 66% of China's annual electricity generation is consumed on motors. By the end of 2006, the installed capacity of motors in China was about 580 million kW, while high-voltage motors accounted for about half of the total. Nearly 70% of the loads pulled by high-voltage motors were fans, pumps and compressors. Half of them were suitable for speed regulation, that is, about 102 million kW of high-voltage motors were in a state of wasteful operation.
According to the statistics of the actual usage of the existing high-voltage converter users, the power saving effect of the high-voltage converter used by different users in different industries is comparable.