Abstract
In wind power systems, LCL inverters have technical problems. First of all, they are non-linear systems and are no longer adapted to the superposition principle; secondly, the coupling is great; finally, it is easy to be interfered by the outside world, and the interference mainly comes from voltage fluctuations and nonlinear loads on the grid. Therefore, it is difficult to control the output result, and then the improved linear active disturbance rejection control (LADRC) is applied. The main improvement of the improved LADRC lies in the linear extended state observer (LESO). Introducing the total disturbance differential signal in LESO, and in order to improve the ability to suppress high-frequency noise, a series of first-order inertia link was applied. The analysis method in this article is mainly frequency domain analysis, under the condition of obtaining LADRC closed-loop transfer function and frequency band characteristics, theoretical analysis of LADRC tracking estimation ability, disturbance suppression ability, and stability. A large number of experimental simulation results verified the superiority of improving LADRC. The main manifestation is that the improved LADRC not only has a fast response speed but also has a strong ability to suppress disturbances and has a good noise suppression effect in high frequency bands.
Highlights
Due to the necessity of energy and the exhaustion of fossil energy, renewable energy had received people’s attention
When wind power grid-connected inverters are affected by grid voltage fluctuations and related loads, they will cause Direct Current (DC) bus voltage fluctuations, which will have a major impact on the stability of the entire wind power system [1,2,3]
Literature [11] proposed a reduced-order extended state observer (RESO) for parallel inverters, which can effectively improve the stability of the system
Summary
Due to the necessity of energy and the exhaustion of fossil energy, renewable energy had received people’s attention. Literature [4] applies a master-slave control strategy to improve the stability of the DC bus voltage. Reference [8] shows that when the ADRC is applied to wind power inverter It can have strong control effect on the complex system with strong coupling, multivariable and nonlinear. Literature [11] proposed a reduced-order extended state observer (RESO) for parallel inverters, which can effectively improve the stability of the system. The DC bus voltage is used as the control object, and the application of LADRC in the outer voltage loop is constructed It introduces the design and configuration method of traditional fourth-order LADRC. Through the frequency domain analysis method, the traditional LADRC and the improved LADRC are compared and analyzed in terms of dynamic and steady state performance and anti-interference ability. The performance of the two control strategies was further verified by simulation and experiment
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