Multifunctional variable-frequency heat pump system with variable rated power at tail end and operation method

The invention relates to a multifunctional variable-frequency heat pump system with variable rated power at tail end and an operation method. The multifunctional variable-frequency heat pump system comprises an outdoor unit, a radiation system cold and hot water heat exchange unit connected with the outdoor unit, a fresh air dehumidification and reheating unit, dehumidification and reheating air conditioner indoor units and a domestic hot water heat exchange unit. The variable-frequency heat pump system can operate in multiple modes, under different operation modes, the rated output power of each indoor air conditioner terminal is automatically adjusted to be suitable for various different operation modes, and on the premise that the rated output power of an outdoor main machine does not need to be increased, the operation efficiency is improved. The sum of the rated output power of each indoor unit does not exceed the rated output power allowed by the outdoor main machine. 本发明涉及一种多功能末端可变额定功率的变频热泵系统及运行方法，包括室外