With the development of science and technology, great progress has been made in the field of power list, some of which have been widely used in various fields, such as uninterruptible power supply (UPS), AC and DC power supply, battery, communication power supply, vehicle power supply, variable frequency power supply, etc. In order to ensure their performance to meet the requirements, these devices need to carry out various tests, including aging test, output characteristics, etc. these tests can be realized by carrying various forms of load, including resistance, inductance and capacitance. The traditional method is to change the power and power factor of resistive, inductive and capacitive components through different combinations, but this method has the following disadvantages:<br>
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