THE IMPACT OF THE REGULATOR OF SYNTHETIC INERTIA OF WIND POWER INSTALLATIONS ON FREQUENCY FLUCTUATIONS IN THE ELECTRIC POWER SYSTEM

Abstract

An electrical system has a certain inertia, expressed in the speed and ability of the system to respond to emerging disturbances. So, if external disturbances in the power system, synchronous generators of traditional power plants are able to maintain continuous operation due to longer time required to change their output parameters, associated with the time of change in the rotor rotation speed, then power converters, which connect RES (renewable energy source) facilities, are practically capable to instantly respond to changes in external network parameters.
The article implements a circuit for a synthetic inertia regulator in order to analyze its effect on the damping of oscillations in the power system as a result of external disturbances. Simulation focused on determining the impact of the constant inertia of a synchronous generator on changes in frequency of the system was made with increased load by means of a two-machine test circuit of an electrical system.
Positive effect of units with greater values of constant inertia on stability is shown in the form of a slower decrease in frequency in transient modes. Research into the influence of wind power plants equipped with synthetic inertia regulators on stability of the system under large disturbances, was made using a test 39-node power system circuit as an example.