With the continuous development of variable frequency speed regulation technology, there are more and more domestic high-voltage inverter manufacturers, so which manufacturers are reliable, have actual production, and can guarantee the quality of products? Now Xiangyang Aodong Electric introduces high-voltage inverters for you. There are more and more cases of high-voltage motors using variable frequency speed regulation technology for speed regulation operation, especially in the production of auxiliary machines in thermal power plants. There are more high-voltage motors, which occupy a dominant position in quantity and capacity. High voltage motor adopts frequency conversion speed regulation control technology, which not only solves the soft start of motor and realizes stepless speed regulation, meets the needs of production technology, but also can greatly save energy and reduce production costs.

In which loads are frequency converters mainly used:

In the modern industrial field, there are a large number of high-power fans and pump equipment, such as blast furnace fans, steelmaking oxygen generators, dust removal fans, compressors for petrochemical production, water supply pumps, induced draft fans, mine drainage pumps, exhaust fans and urban water supply pumps in the electric power industry. The driving motors of these equipment are 400KW-4000KW, 3KV-10KV high-power high-voltage AC motors. If speed regulation devices are not used, it will cause great waste of electric energy. Rolling mills, Electric locomotives are also commonly used high-power high-voltage motor drive or traction, but also need speed control devices to carry out accurate control, according to statistics, high-voltage motor electricity consumption accounts for more than two-thirds of the total motor electricity consumption, therefore, in the work practice to continuously strengthen the principle of high-voltage inverter and application analysis is very necessary.

Analysis of the working principle of the frequency converter:

The so-called high-voltage frequency converter generally refers to the frequency converter with voltage higher than AC 380V. Common ones are 0.69KV, 2.3KV, 3KV, 6KV, and 10KV voltage levels. Compared with the grid voltage, it can only be counted as medium voltage. Therefore, this type of frequency converter is usually called medium voltage frequency converter in foreign countries. There is little difference between high voltage frequency converter and low voltage frequency converter in essence. In frequency conversion principle, mechanical characteristics and load characteristics, control technology, The influence on peripheral electrical equipment is basically the same, but due to the voltage resistance of switching devices, cost and harmonics on peripheral equipment and other reasons, the development of a new high-voltage inverter main circuit topology, in addition to the load on the dynamic and steady state requirements are high, so there are many new developments in PWM control methods and control technology.

High voltage inverter classification:

According to the structural characteristics of high voltage frequency converter, it can be divided into two types of structure mode: high-low-high voltage frequency converter, which reduces the high voltage of power grid to low voltage for city use by step-down transformer, connects to general low voltage frequency converter for frequency conversion, and then raises it to high voltage by step-up transformer to drive high voltage motor, which includes high, low and high links, so it is called high-low high voltage frequency converter. The second type is high-high voltage frequency converter, which is directly connected to high voltage of power grid and directly connected to high voltage motor after frequency conversion. There are only two links, high and high, and no low voltage links, so it is called a high and high voltage inverter.

How to choose the right type of high voltage inverter

In the actual production of power plants, especially for units above 100MW, high voltage motors play a major role in the production of auxiliary machines, and the load electricity of this part accounts for a large proportion of the power plant's own electricity. Therefore, there is potential for energy saving transformation by using high voltage frequency conversion technology. There are many loads that can be used by high voltage frequency converters in thermal power plants, mainly boiler induced draft fans, blowers, feed pumps, circulating pumps, mortar pumps and feed systems. At present, Combined with the actual situation of power plant load to do the selection work is to use high-voltage inverter technology * an important step, engineering practice, usually choose high-low high-type inverter.
Aodong electric high voltage inverter is a large telegraph equipment integrating power electronic technology and control technology

In practical application, various specific problems may be encountered, and different countermeasures need to be taken to ensure long-term reliable operation of the equipment. No matter what form of high-voltage frequency converter, its normal heat generation is about 4%~ 6% of the capacity. For the installation site, ventilation and heat dissipation must be done well. Excessive ambient temperature will reduce the output power of the frequency converter and accelerate the aging of electronic components, affecting the service life of the frequency converter. Therefore, it is recommended to install a heat dissipation duct or an air conditioner for the frequency converter. Aodong Electric Inverter is quality-oriented, to meet customer needs as the main core, to provide customers with first-class products and services.