CLAIMS 1. An electric vehicle control system that controls power consumption in each electric vehicle in a train configured by a plurality of electric vehicles, the electric vehicle control system comprising:
a plurality of power conversion devices, each of which converts power supplied from an overhead line to generate driving power for an AC motor when the train is running, and which converts regenerative power generated by the AC motor to return to the overhead line and determine as to whether the train is in a light load regenerative state when the train uses a regenerative brake; and
a plurality of power consuming apparatuses that change an operation mode when at least one of the power conversion devices is in the light load regenerative state.
2. The electric vehicle control system according to claim
1,
wherein the power consuming apparatuses include either one of a compressor and an air conditioner, wherein the compressor generates compressed air to be stored in an air tank of an air brake system when a remaining amount of the air stored in the air tank becomes lower than a predetermined threshold.
3. The electric vehicle control system according to claim
1,
wherein the power consuming apparatuses include both a compressor and an air conditioner, wherein the compressor generates compressed air to be stored in an air tank of an air brake system when a remaining amount of the air stored in the air tank becomes lower than a predetermined threshold.

4. The electric vehicle control system according to claim
3,
wherein the compressor changes the threshold to be a value higher than usual, when at least one of the power conversion devices is in the light load regenerative state.
5. The electric vehicle control system according to claim
3,
Wherein, when at least one of the power conversion devices is in the light load regenerative state, the air conditioner changes a target temperature to a value lower than before when the air conditioner is in a cooling operation, and changes the target temperature to a value higher than before when the air conditioner is in a heating operation.
6. An electric vehicle control system that controls power
consumption in each electric vehicle in a train configured
by a plurality of electric vehicles, the electric vehicle
control system comprising:
a plurality of power conversion devices, each of which converts power supplied from an overhead line to generate driving power for an AC motor when the train is running, and which converts regenerative power generated by the AC motor to return to the overhead line and measures a voltage on the overhead line side to output the measured value when the train uses a regenerative brake;
a central device that determines as to whether there is any power conversion device in a light load regenerative state according to the measured value output from each of the power conversion devices; and
a plurality of power consuming apparatuses that change

operation mode when the central device determines that there is a power conversion device in the light load regenerative state.
7. The electric vehicle control system according to claim
6,
wherein the power consuming apparatuses include either one of a compressor and an air conditioner, wherein the compressor generates compressed air to be stored in an air tank of an air brake system when a remaining amount of the air stored in the air tank becomes lower than a predetermined threshold.
8. The electric vehicle control system according to claim
6,
wherein the power consuming apparatuses include both a compressor and an air conditioner, wherein the compressor generates compressed air to be stored in an air tank of an air brake system when a remaining amount of the air stored in the air tank becomes lower than a predetermined threshold.
9. The electric vehicle control system according to claim
8,
wherein the compressor changes the threshold to a value higher than usual, when the central device determines that there is a power conversion device in the light load regenerative state.
10. The electric vehicle control system according to claim
8,
wherein in a case in which the central device determines that there is a power conversion device in the

light load regenerative state, the air conditioner changes a target temperature to be a value lower than before if the air conditioner is in a cooling operation, and changes the target temperature to a value higher than before if the air conditioner is in a heating operation.
11. A power conversion device provided in a train
configured by a plurality of electric vehicles, which
generates driving power for an AC motor when the train is
running, and converts power generated by the AC motor to
return to the overhead line when the train uses a
regenerative brake,
Wherein, when detecting a light load regenerative state, the power conversion device informs this fact to all specific types of power consuming apparatuses mounted in its own train so as to cause the operation mode to be changed.
12. The power conversion device according to claim 11,
wherein, when detecting the light load regenerative
state, the power conversion device causes to change an operation mode of a compressor that generates compressed air to be stored in an air tank when a remaining amount of the air stored in the air tank of an air brake system becomes lower than a predetermined threshold, or causes to change an operation mode of an air conditioner.
13. The power conversion device according to claim 11,
wherein, when detecting the light load regenerative
state, the power conversion device causes to change an operation mode of a compressor that generates compressed air to be stored in an air tank to be changed when a remaining amount of the air stored in the air tank of an

air brake system becomes lower than a predetermined threshold, and causes to change an operation mode of an air conditioner.
14. The power conversion device according to claim 13,
wherein, when detecting the light load regenerative
state, the power conversion device causes the threshold to be changed to a value higher than usual.
15. The power conversion device according to claim 13,
wherein when detecting the light load regenerative
state, the power conversion device causes a target temperature to be changed to a value lower than before if an air conditioner is in a cooling operation, and causes the target temperature to be changed to a value higher than before if the air conditioner is in a heating operation.