Second, the basic role of the inverter

1、Frequency conversion energy saving

Inverter energy saving is mainly shown in the application of fans and pumps. In order to ensure the reliability of production, a variety of production machinery in the design with power drive, are left with a certain amount of surplus. When the motor can not run under full load, in addition to the power drive requirements, the excess torque increases the active power consumption, resulting in a waste of electrical energy. Fans, pumps and other equipment traditional speed control method is to adjust the inlet or outlet baffle, valve opening to adjust the amount of air and water supply, its input power is large, and a lot of energy consumption in the baffle, valve interception process. When using frequency control, if the flow rate is reduced, the requirement can be met by reducing the speed of the pump or fan. Ltd. produced by the inverter applied to the fan pump type load energy-saving example: a centrifugal pump motor power of 55 kilowatts, when the speed down to the original speed of 4 / 5, its power consumption of 28.16 kilowatts, saving 48.8%, when the speed down to the original speed of l / 2, its power consumption of 6.875 kilowatts, saving 87.5%.

2、Power factor compensation energy saving

The reactive power not only increases the line loss and equipment heating, but mainly the reduction of power factor leads to the reduction of active power of the power grid, a large amount of reactive power is consumed in the line, the equipment is inefficient and wasteful, after using the frequency control device, due to the role of the internal filter capacitor of the frequency converter, thus reducing the reactive power loss and increasing the active power of the power grid.

3、Soft start energy saving

The hard start of the motor causes serious impact on the power grid, and will also require too high a capacity of the power grid, and the high current and vibration generated during the start is extremely damaging to the baffle and valve, and extremely detrimental to the service life of equipment and pipelines. After using the frequency conversion energy-saving device, the soft start function of the frequency converter will make the starting current start from zero, and the maximum value will not exceed the rated current, which will reduce the impact on the power grid and the requirement of power supply capacity, and prolong the service life of the equipment and valves. It saves the maintenance cost of the equipment.

4, according to statistics, China's total potential market space for inverters is about 120 billion to 180 billion yuan, of which the normal-voltage inverter accounts for about 60% of the market share, the number of medium- and high-voltage inverter demand is relatively small, but because of the large power of a single inverter, high selling price, also accounts for about 40% of the market.

There are at least 180 million kilowatts of motors with variable loads and energy-saving potential in China, thus providing an extremely huge market for the application of inverters. Data show that China's inverter market has been maintaining a growth rate of 12% to 15%, and is expected to maintain a growth rate of more than 10% in the market demand for inverters for at least the next five years. And in 10 years later, the inverter market can gradually saturate. Of course, with the progress and diversification of user needs, the functions of inverter products are constantly improving and increasing, and the degree of integration and systematization is getting higher and higher, and there have been certain fields of special energy-saving inverter products. The energy-saving principle of the inverter is: the inverter makes the motor and its dragging load to adjust the speed output according to the production process requirements without any changes, which reduces the power consumption of the motor and has great unique advantages in the field of energy saving and emission reduction, and achieves the purpose of efficient operation of the system. From an overall perspective, the competition in China's inverter industry is becoming increasingly fierce. As the market is very attractive, not only the market has formed a certain scale, but also the potential capacity is very considerable, constantly attracting new players in the industry, the development of inverter technology, so that the inverter in modern fields such as electric power, cement, elevators, mining, metallurgy, transportation and other unprecedented promotion and application, I believe that the inverter application will become more and more extensive, and the market outlook is promising. Inverter enterprises should take advantage of the "12th Five-Year Plan" energy saving and emission reduction to better establish the concept of energy saving. The energy-saving performance of the products will be on a higher level, which is very beneficial to the future development of inverter enterprises.