TY  - EJOU
AU  - Mao, Xin 
AU  - Su, Hongsheng 
AU  - Li, Jingxiu 

TI  - Research on Grid-Connected Control Strategy of Distributed Generator Based on Improved Linear Active Disturbance Rejection Control
T2  - Energy Engineering

PY  - 2024
VL  - 121
IS  - 12
SN  - 1546-0118

AB  - The virtual synchronous generator (VSG) technology has been proposed to address the problem of system frequency and active power oscillation caused by grid-connected new energy power sources. However, the traditional voltage-current double-closed-loop control used in VSG has the disadvantages of poor disturbance immunity and insufficient dynamic response. In light of the issues above, a virtual synchronous generator voltage outer-loop control strategy based on improved linear autonomous disturbance rejection control (ILADRC) is put forth for consideration. Firstly, an improved first-order linear self-immunity control structure is established for the characteristics of the voltage outer loop; then, the effects of two key control parameters-observer bandwidth <i>ω</i><sub>0</sub> and controller bandwidth <i>ω</i><sub><i>c</i></sub> on the control system are analyzed, and the key parameters of ILADRC are optimally tuned online using improved gray wolf optimizer-radial basis function (IGWO-RBF) neural network. A simulation model is developed using MATLAB to simulate, analyze, and compare the method introduced in this paper. Simulations are performed with the traditional control strategy for comparison, and the results demonstrate that the proposed control method offers superior anti-interference performance. It effectively addresses power and frequency oscillation issues and enhances the stability of the VSG during grid-connected operation.
KW  - Virtual synchronous generator (VSG); active power; improved linear active disturbance rejection control (ILADRC); radial basis function (RBF) neural networks; improved gray wolf optimizer (IGWO)

DO  - 10.32604/ee.2024.057106