High-voltage inverter features and future market trends

The high voltage frequency converter is a power control device that uses the on-off function of the power semiconductor device to convert the power frequency power source to another frequency. Input high-power frequency converters with a power supply voltage of over 3KV, high-voltage, high-power variable frequency speed control devices are widely used in various industries such as petrochemicals, municipal water supply, metallurgy steel, power energy and other industries, such as fans, pumps, compressors, and rolling mills. .

The main voltage levels are 3000V, 3300V, 6000V, 6600V, 10000V, etc.

working principle:

1. The high-low-high-voltage high-voltage inverter is a step-down transformer of a high-voltage power supply, and is controlled by a low-voltage inverter. The step-up transformer is used to increase the voltage to the voltage used by us, and the high-voltage motor is used. General high and low high-end methods are used in low-power high-voltage motors for frequency conversion and energy saving.

2. After the low-high voltage inverter is controlled by the low voltage inverter, the boost voltage transformer is used to increase the voltage to the motor voltage. The low-high mode is also used in low-power high-voltage motors for frequency conversion and energy saving.

3, high-high way high-voltage inverter is directly connected with a plurality of modules in the inverter, the direct use of high-voltage power supply, direct output high voltage for high-voltage motor use. The high way is mainly used in high-power high-voltage motors for frequency conversion and energy saving.

High voltage inverter classification:

General-purpose and high-performance two kinds, domestic-funded companies currently occupy more than 80% of the market share in the general field, the fierce competition led to a sharp decline in prices in 10 years; high-performance market is still dominated by foreign capital (Japan's Fujitsu, Mitsubishi, Toshiba; Sweden ABB; Germany's Siemens (Robinson, Hundred Billion, Leadward, etc.) The gross profit is approximately 50% higher than that of general-purpose products, and will become the main direction of domestic-funded enterprises (to be led by Rongxin and Hekang) in the future.

Related experts judge the future market competition situation of high-voltage frequency conversion:

——With the increase in downstream demand in 2011, the market competition for general-purpose inverters is expected to ease, and the recovery of corporate gross profit is a high-probability event, but it is more difficult to return to 2009 levels;

——The number of market participants continues to increase, and future products will place more emphasis on customization and system solutions. Leading companies will have strong R&D capabilities and strong financial strength, which will further increase market share;

——High-performance inverter technology has a high threshold, and the industry is expected to duplicate the process of importing and replacing general-purpose inverters. Due to the current low level of domestic investment, product gross profit will remain stable for some time in the future.

Compared with general-purpose inverters, high-performance products use vector control and energy feedback technology, featuring constant torque, fast dynamic response, high speed accuracy, wide speed range, and fast braking. The unit price is as high as 10 million yuan. Gross profit is also significantly higher than that of general products.