In the face of large-scale development and utilization of new energy such as wind power and photovoltaic

the problem of insufficient flexibility of power system operation has become increasingly prominent.With the continuous advancement of electric energy transformation

the continuous innovation of power technology and the wide application of distributed generation technology

the load side is developing rapidly towards the trend of digitization

intelligence and activeness.Among them

temperature control loads such as air conditioning and electric heating show great adjustable potential.It is necessary to sort out the current research progress and future direction of temperature control load participating in grid auxiliary service technology from different angles.Firstly

the challenges faced by the active frequency control of the power grid under the new power system are summarized.Combined with the control framework of different frequency modulation mechanisms

the principles and characteristics of each control method of the temperature control load participating in the frequency modulation of the power grid are described in detail

and the advantages and disadvantages of different methods are analyzed.Secondly

the performance and application scenarios of single temperature control load and aggregation model are evaluated.Finally

the main problems and technical methods of air-conditioning load participating in different auxiliary services such as primary frequency modulation

secondary frequency modulation and underfrequency load shedding are summarized

so as to promote the temperature-controlled load to become an important part of power system frequency modulation in the future.