Power load control system and control method for multi-unit air conditioners

Disclosed herein are a multi-air conditioner peak power control system and a control method thereof. The peak power control system comprises a central control unit (210) for controlling a multi-air conditioner system (200) including a plurality of multi-air conditioners (221 and 222) each having an outdoor unit (221) and a plurality of indoor units (222) in an integrated manner, and operating the multi-air conditioner system (200) at a reference operation rate, and a demand control unit (100) for sending/receiving data to/from the central control unit (210) to control power consumption of the multi-air conditioner system (200) such that the power consumption is less than total reference power consumption allocated to a building. The control method of the peak power control system adjusts the total power consumption in the building such that the total power consumption does not exceed the total reference power consumption in a more efficient and convenient way, thereby reducing excessive cost burden due to power over-consumption and significantly enhancing user convenience.