Application of generating units based on renewable energy sources for damping oscillations in the power system

Abstract

In today’s world, generating units based on renewable energy sources occupy one of the main places when it comes to the development of power systems. Modern generating units based on renewable energy sources have a power converter in their composition. On the one hand, the use of a power converter gives some advantages: no direct connection to the grid, operation in all quadrants of the PQ diagram. However, on the other hand, widespread use of renewable generation units based on power converter reduces the overall inertia of the EPS, excessive use of power electronic converters in the electric grid will cause many harmonic disturbances and create new problems for safe and stable operation of EPS. In order to ensure the reliable operation of EPS with renewable energy units based on the power converter, the power converters control system should be upgraded to meet the requirements of conventional generation as part of EPS. This paper presents the result of applying a power oscillation damping controller implemented in a power converter to improve the stability of a high-dimensional EPS. The paper presents an analysis of the effect of regulators of different topology for oscillation damping. The results of the application of the power oscillation damping regulator in the following research scenarios are presented. For a more accurate assessment of the impact of the regulator, the transient damping coefficient was calculated. In this paper, the result of using the oscillation damping controller implemented in the power converter for the PV station to improve the stability of the EPS as a whole was demonstrated. The proposed solution is based on the “deloading” strategy of the PV power station and the SI block with two-loop control. The effect of oscillation damping controller on power fluctuations was evaluated according to the AVR oscillator tuning methodology.