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 agriculture.
However, frequency converter technique research is focused on three-phase high power frequency conversion technology
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 voltage
amplitude and guarantee the widely use of the three-phase AC motor under the condition of agricultural 220V singlephase
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.
Research on Control Strategy of AC-DC-AC Substation Based on Modular Multilevel Converter