Power supply system, transmission equipment, and power transmission method

Abstract

The present invention provides a power supply system, a transmission facility, and a power transmission method capable of supplying as much energy as possible from two power storage devices to an electric load and improving the utilization efficiency of the energy. The control device (5) of the electric power supply system (1) executes a process from the first power storage device (2) to the second power storage device (3) when the remaining capacity of the first power storage device (2) is smaller than a threshold value 1a. ) in which at least one or both power storage devices including the first power storage device (2) supplies power to the electric load (100).

Description

technical field [0001] The present invention relates to a power supply system for supplying power to electric loads such as electric motors using two power storage devices. Background technique [0002] Conventionally, as such a power supply system, for example, a system disclosed in Patent Document 1 is known. Patent Document 1 proposes a system that supplies power to an electric motor of a vehicle using two power storage devices, a high-capacity power storage device (battery pack) and a high-output power storage device (battery pack). [0003] In this system, while maintaining the remaining capacity of the high-power storage device at a reference value, power is supplied to the electric motor mainly from the high-capacity storage device. Then, when the state of charge (SOC) of the high-capacity power storage device falls to 0%, power is then supplied to the electric motor from the high-power power storage device. [0004] prior art literature [0005] patent documents ...

AI Technical Summary

Problems solved by technology

Therefore, in practice, when the remaining capacity of the high-capacity storage device falls to around 0%, it becomes impossible to supply the necessary electric power from the high-capacity storage device to the electric motor, and it becomes difficult to use the high-capacity storage device. Remaining capacity reduced to 0%

[0008] Therefore, in the technique disclosed in Patent Document 1, when the required power cannot be supplied from the high-capacity power storage device to the electric motor, the remaining capacity of the high-capacity power storage device actually remains to some extent. It is also considered that the remaining capacity of the high-capacity power storage device has decreased to 0%, and it is necessary to switch from the high-capacity power storage device to the high-output power storage device to supply power to the electric motor

[0009] Therefore, in the technique disclosed in Patent Document 1, the power of the high-capacity power storage device cannot be fully utilized.

Furthermore, the period during which the necessary electric power can be supplied to the electric motor is shortened, resulting in a decrease in the cruising distance of the vehicle

[0010] In addition, since the electric motor is only supplied with power from the high-power storage device after the discharge of the high-capacity storage device is completed, the output of the high-power storage device may change rapidly, causing the high-power storage device to become Overdischarge state

In addition, since a high-power storage device is generally prone to deterioration in an overdischarge state, the deterioration of the storage device may rapidly progress.

Furthermore, the period during which the necessary electric power can be supplied to the electric motor is shortened, resulting in a decrease in the cruising distance of the vehicle

[0011] Furthermore, when the power supply from the high-output type power storage device to the electric motor is stopped early in order to prevent the above, the utilization efficiency of the total stored energy of the high-capacity type and high-power type power storage devices decreases.

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