The main drawback is that the load cannot operate at the power frequency.
High-voltage frequency converters are long-term operating equipment, and malfunctions are inevitable during operation. When a frequency converter fails, the load equipment cannot be put into use at the power frequency, which is a very frustrating thing for continuous production enterprises!
Currently, some European and American manufacturers, due to limitations in their inverter output voltage levels (maximum output voltage 6.3KV), are promoting the following two solutions to users:
Because high-voltage, high-power frequency converters have four important performance indicators—input harmonics, input power factor, output waveform quality, and reliability—these two solutions are generally unacceptable to users in China. The main reasons are:
Its output has a high harmonic content, requiring the addition of a filter.
When operating at low frequencies, it has a low power factor for the power grid.
Not suitable for China's 10KV voltage level power grid!
The power component drive circuit board is complex, resulting in a high failure rate. After-sales spare parts costs are also high.
Currently, mainstream domestic frequency converter manufacturers (such as Huafu, Hekang, and Rongxin) all adopt the "high-high voltage source type multi-unit series perfectly harmonic-free" frequency converter topology. Siemens acquired Robicon's "multi-unit series" topology technology to adapt to China's power grid conditions! Rockwell also acquired Harbin Jiuzhou's frequency converter business for the same reason. They all know that mainstream technologies are irreplaceable!
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