PN-busbar common system, regenerative control device, and regenerative control method
AssigneeMitsubishi Electric Corporation
InventorsTakashi Miyasaka, Yasuhiro Endo
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Abstract
A PN-busbar common system includes motor drive devices for a plurality of motors, each of which is supplied with power from a common PN-busbar, where the motor drive devices individually drive the corresponding motors. Each of the motor drive devices executes a regenerative control on a basis of a regenerative-control start voltage, and controls to stop the regenerative control on a basis of a regenerative-control stop voltage, and also individually calculates a regenerative load ratio to control to enable or disable the regenerative control on a basis of a result of a comparison between a calculated regenerative load ratio and a set regeneration-capable load ratio.
Claims3
A regenerative control method that is applied to a PN-busbar common system to control a voltage in a common PN-busbar so as to suppress a voltage increase, where in the PN busbar common system, a plurality of motor drive devices are provided correspondingly to a plurality of motors, each of which is supplied with power from the PN-busbar, and the motor drive devices individually drive the corresponding motors, the regenerative control method comprising:
- a first step of determining whether a bus voltage generated in the PN-busbar has reached a regenerative-control start voltage;
- a second step of determining whether a regenerative load ratio is lower than a regeneration-capable load ratio that is a determination value used to determine whether the regenerative control is restarted, if the bus voltage has reached the regenerative-control start voltage at the first step;
- a third step of starting a regenerative control if the regenerative load ratio is lower than the regeneration-capable load ratio at the second step;
- a fourth step of determining whether the bus voltage has reached a regenerative-control stop voltage if the regenerative control is started at the third step;
- and
- a fifth step of stopping the regenerative control if the bus voltage has reached the regenerative-control stop voltage at the fourth step.
A regenerative control method that is applied to a PN-busbar common system to control a voltage in a common PN-busbar so as to suppress a voltage increase, where in the PN busbar common system, a plurality of motor drive devices are provided correspondingly to a plurality of motors, each of which is supplied with power from the PN-busbar, and the motor drive devices individually drive the corresponding motors, the regenerative control method comprising:
- a first step of determining whether a bus voltage generated in the PN-busbar has reached a regenerative-control start voltage;
- a second step of determining whether a regenerative load ratio is lower than a maximum allowable load ratio that is a determination value used to determine whether the calculated regenerative load ratio has reached an allowable regenerative capability, if the bus voltage has reached the regenerative-control start voltage at the first step;
- a third step of starting a regenerative control if the regenerative load ratio is lower than the maximum allowable load ratio at the second step;
- a fourth step of determining whether the bus voltage has reached a regenerative-control stop voltage if the regenerative control is started at the third step;
- and
- a fifth step of stopping the regenerative control if the bus voltage has reached the regenerative-control stop voltage at the fourth step.
Dependencies are inferred from the claim text.