关键词: 高压变频器, 瞬时失电, VVVF, 转子频率搜索, 轴编码器

Abstract: With the expansion of frequency control system application fields, in order to avoid the impact on production for high-voltage inverter instantaneous power failure, the instantaneous power failure restart technology of high-voltage inverter came into being. The key of this technology is to search the rotor frequency, so that it can be close to the inverter output frequency. There are some search modes which is algorithm complexity and less precise, so it is difficult to achieve for VVVF inverters. this paper presents a new implementation method, which use shaft encoder to detect motor speed , and the result of theoretical analysis and experimental can verify the validity of this method, so it has good application prospects.

Key words: high-voltage inverter, instantaneous power failure, VVVF, frequency search, shaft encoder