Abstract: Voltage and power quality are important support for the construction of new power system, and reactive power management and control during holidays is an important part of power quality assurance. Ningbo Company proposes reactive power regulation and management methods for regional power grid holidays for new power systems from the three aspects of reactive power potential mining on the power supply side under the interaction of "source network load", operation mode optimization on the power grid side, and fine management and control on the load side. Under the extreme low load operation of Ningbo power grid in the Spring Festival of 2022, Make full use of various measures to realize effective control of reactive power and voltage of power grid, so as to meet the normal operation requirements of power grid, and provide reference and reference for reactive power control of regional power grid facing new power system in holidays.