Abstract
The wind power grid-connected inverter system has nonlinear, strong coupling, and is susceptible to grid voltage fluctuations and nonlinear load effects. To achieve satisfactory control results, the voltage outer loop is controlled by an improved linear active disturbance rejection control (LADRC). LADRC has strong adaptability, robustness and operability. It can automatically detect and compensate for internal and external disturbances, and correct complex controlled objects to integrator series. The total perturbation differential signal is introduced in the traditional linear extended state observer (LESO), which improves the dynamic perturbation observation ability of LESO. The frequency response characteristics analysis shows that the new LADRC has better anti-interference performance. The effectiveness of the improved controller under multiple operating conditions is verified by simulation.
Highlights
As the environment deteriorates, protecting the environment, conserving resources, and reducing pollution emissions have become the consensus of mankind
Where x1, x2 are the bus voltage and its differential, respectively; x3 is a new state variable expanded in the linear extended state observer (LESO), which can be understood as the total perturbation of the system in physical x2 = 0
By comparing the bus voltage waveforms during low voltage steady-state effects of Figure 15, the new linear active disturbance rejection control (LADRC) proposed in this paper had the advanta traversing, it can be seen that the second-order non-linear active disturbance rejection controller (ADRC) had strong control performance, short convenient adjustment and good steady-state performance
Summary
As the environment deteriorates, protecting the environment, conserving resources, and reducing pollution emissions have become the consensus of mankind. The control variable, and physical meaning is the output voltage of inverters; z1 , z2 , z3 are the output of LESO observation system, its differential, and total disturbance, respectively. Where x1 , x2 are the bus voltage and its differential, respectively; x3 is a new state variable expanded in the LESO, which can be understood as the total perturbation of the system in physical sense, including the internal disturbance of the system (the function containing the state variable x and its derivative) and the external disturbance of the system (independent of the state variable x and its derivative), denoted by f ; h represents the differential of f .The third-order LESO can be modeled as follows [30]: z. The traditional LADRC can be simplified to three adjustable parameters: controller bandwidth ωc , observer bandwidth ω0 and b0
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