In this study, in order to determine the reasonable accuracy of the compensation\ncapacitances satisfying the requirements on the output characteristics for a wireless power transfer\n(WPT) system, taking the series-series (SS) compensation structure as an example, the calculation\nformulas of the output characteristics, such as the power factor, output power, coil transfer efficiency,\nand capacitors� voltage stress, are given under the condition of incomplete compensation according\nto circuit theory. The influence of compensation capacitance errors on the output characteristics\nof the system is then analyzed. The Taylor expansions of the theoretical formulas are carried out\nto simplify the formulas. The influence degrees of compensation capacitance errors on the output\ncharacteristics are calculated according to the simplified formulas. The reasonable error ranges of\nthe compensation capacitances are then determined according to the requirements of the output\ncharacteristics of the system in the system design. Finally, the validity of the theoretical analysis\nand the simplified processing is verified through experiments. The proposed method has a certain\nguiding role for practical engineering design, especially in mass production.
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