Alternating-current impedance measurement method for battery in hybrid power supply power system
A technology of AC impedance and power system, applied in the direction of load forecasting, measuring electricity, measuring device, etc. in the AC network, it can solve the problem of difficulty in identifying the internal state of the composite power system in an integrated manner, and achieve the effect of reducing difficulty and cost.
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[0042] The structure of a composite power supply power system for a new energy vehicle is as follows: figure 2 As shown, including the fuel cell and lithium battery, during the operation of the vehicle, the load demand power will change, and the fuel cell and lithium battery will adjust the output current accordingly. Considering the cost and volume, only one AC impedance measurement device is installed , using the device to measure the AC impedance of the fuel cell, it is difficult to integrally identify the internal state of the composite power system. In the prior art, the impedance of the fuel cell is calculated by directly applying an AC disturbance signal to the fuel cell through a DC / DC voltage converter, regardless of the state of the lithium battery.
[0043] After the inventor's analysis and research, it is found that when the vehicle runs stably, the required power of the load remains unchanged. At this time, the AC disturbance signal is applied to the fuel cell th...
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