A Virtual Synchronous Generator Secondary Frequency Modulation Control Method Based on Active Disturbance Rejection Controller

Abstract

In order to solve the frequency modulation (FM) problem caused by load in the virtual synchronous generator (VSG) system under an islanding state, this paper proposes a frequency modulation method based on active disturbance rejection control (ADRC). Firstly, design a nonlinear function using the design rules of nonlinear functions. Then, the extended state observer (ESO) and nonlinear feedback control law (NLSEF) of ADRC are designed based on the nonlinear function. By introducing ADRC into the power–frequency control loop of VSG, error-free frequency modulation of VSG is achieved. Finally, the superiority of the proposed method was verified through experimental comparison.

Disturbance Rejection Control of Grid-Forming Inverter for Line Impedance Parameter Perturbation in Weak Power Grid

“…Conventional grid-following (GFL) inverters are synchronized with the grid through the phase-locked loop (PLL), and their proper operation relies on the presence of a voltage source in the system which can build a voltage reference. However, more IBRs also lead to faster system dynamics, and the stable operation of the GFL will be affected, resulting in a lack of voltage support and inertial responsiveness of the grid [3,4].…”