Abstract：To address the need of carbon emission peak and carbon neutrality target on local energy systems，

an optimal expansion planning method of heat pump was proposed for regional energy stations considering the

benefits from ancillary services. The method was used to support the integration of new technologies such as heat

pumps into existing local energy systems. Firstly，an integrated power，gas and heating system model was

developed to reflect the interactions between different energy systems. On this basis，a bi-level expansion planning

model that considers the benefits of grid ancillary services was proposed，taking into account the impact of factors

such as energy cost，ancillary services price，existing energy storage capacity，and carbon emission cost on the

planning results. Finally，a university campus energy supply station where heat pump replaces combined heat and

power units was used as an example to analyze the effects of the above factors on the expansion planning results，

validating the effectiveness of the proposed method.

      Key words：heat pump；ancillary service；regional energy stations；expansion planning；multi-energy systems