METHOD FOR SEQUENTIALLY MEASURING IMPEDANCE, MEASUREMENT DEVICE, AND FUEL CELL SYSTEM

摘要

Provided are a sequential impedance measurement device and a method for sequentially measuring impedance. While applying a signal having a power output fluctuation similar to that of normal operation, it is possible to carry out a quick measurement with relatively high precision and in a broad frequency range. Also, the device and the method can simultaneously determine phenomena which occur in different frequency ranges. Disclosed is a sequential impedance measurement device in which impedance of a fuel cell is sequentially measured in a control system, the control system controlling the fuel cell by using a power indication value of a control processor, the device including: an M-sequence-signal-generating section; a superimposed-signal-generating section; a signal-processing section; a signal-adding unit; a current and voltage measuring unit; and an impedance calculator, wherein a method for controlling the fuel cell by the control processor is modified according to a calculation result of the impedance calculator.