Abstract
The distribution static synchronous compensator (D-STATCOM) has the characteristics of non-linearity, multivariable and strong coupling. Based on the analysis of the D-STATCOM mathematical model, in order to improve the performance of the linear active disturbance rejection controller (LADRC), solve the coupling problem between the d-axis and q-axis current and improve the dynamic tracking response speed and anti-interference ability. A controller with LADRC that compensates the error of the total disturbance is proposed, and the stability of the improved first-order LADRC is proved by the Lyapunov stability theory. Then the output of the full interference channel is corrected to improve the anti-interference ability of the system and the interference observation ability of the linear extended state observer (LESO) to high-frequency noise. Through the analysis of the Bode diagram in the frequency domain, compared with the traditional LADRC, the improved LADRC proposed in this paper has better anti-interference performance. Finally, the improved first-order LADRC is used to replace the traditional D-STATCOM control strategy for current inner loop control, which effectively reduces the disturbance observation error of LESO. The experimental results show that the improved LADRC control performance is better than the proportional integral (PI) controller, and it has better tracking performance and anti-interference performance.
Highlights
In recent years, due to the large-scale application of smart grids and distributed energy such as wind power and photovoltaics, the grid structure has become more complex
In [26], linear active disturbance rejection controller (LADRC) was proposed, and a parameter tuning method based on pole configuration was given
The state variables and total disturbances of the system can be observed by designing an appropriate linear extended state observer
Summary
Due to the large-scale application of smart grids and distributed energy such as wind power and photovoltaics, the grid structure has become more complex. VOLUME 9, 2021 and compensates the total disturbance of the system in real time through the Extended State Observer (ESO), realizes the dynamic linear feedback, and breaks the boundary between the linear system and the nonlinear system This nonlinear control method faces many parameters and is difficult to adjust, which is not conducive to practical engineering applications. In [26], linear active disturbance rejection controller (LADRC) was proposed, and a parameter tuning method based on pole configuration was given This method attributes the parameter design to the setting of the observer bandwidth and the controller bandwidth, retains the excellent performance of ADRC, simplifies parameter setting, reduces the amount of calculation, and is easy to implement in engineering. The state variables and total disturbances of the system can be observed by designing an appropriate linear extended state observer
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