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In the countryside of China, the main power supply mode is 220V single-phase power, which affects the widely application of three-phase agricultural appliances. What's more, it means a block to the development of modern agricul- ture. However, frequency converter technique research is focused on three-phase high power frequency conversion tech- nology at present, and there are very few achievements on the agricultural low power single-phrase frequency conversion research. In this paper, considering the difficulty of widely application of agricultural low power three-phase AC motor because it is not easy to obtain the three-phase power supply, a three-phase AC frequency conversion system under the condition of agricultural 220V single-phase AC power is designed, which can achieve the stepless regulation of the volt- age amplitude and guarantee the widely use of the three-phase AC motor under the condition of agricultural 220V single- phase AC power. The experimental results show that the system can output the controlled three-phase AC power when the input is 220V single-phase AC power. And the rational design of the system hardware also provides the technical support for the application of agricultural low power frequency conversion.

Design and Experimental Research of Agricultural Low Power Singlephase Frequency Conversion Control System Based on SPWM