Abstract
This paper studies an improved set-valued observer (SVO) for a complex model of a wind energy conversion system (WECS). To fit reality, an unknown function is used to describe the aerodynamic model, and a delay of the input signal is added to simulate the actual situation. The conservative SVO estimates the state error convergence within an adjustable interval. The extended Lipschitz condition, set-induced theory, and uniformly ultimately boundedness guarantees the convergence of errors. Based on the SVO, a fault detection system and corresponding fault detection strategies for common faults of WECSs are proposed. By adjusting the gain matrix L, the SVO shows excellent state tracking performance. The simulation results show that the proposed fault detection system can provide rapid and accurate fault detection.
Highlights
As more countries continue to increase the installed capacity of wind power, the research and development, control of wind energy conversion system (WECS) have become a hotspot of research
Based on the set-valued observer (SVO), fault detection strategies were proposed for some common faults that occur in WECSs
Fault detection strategies based on a single global SVO have been designed
Summary
As more countries continue to increase the installed capacity of wind power, the research and development, control of wind energy conversion system (WECS) have become a hotspot of research. It was of significant value to establish a complex model of a WECS with an unknown nonlinear part and communication delays and research the fault detection problem based on an observer with simple structure and good state tracking capability. Shen: Fault Detection of WECSs With a Delayed Input and an Unknown Part Based on SVO. It is of great significance to improve the SVO and apply it to the fault detection of complex WECSs. In this paper, the fault detection of a faulted WECS with a delayed input and an unknown part based on SVO was studied. Based on the SVO, fault detection strategies were proposed for some common faults that occur in WECSs. The structure of this paper is as follows. Since the range of L is affected by vj and n (t), and not every matrix in the range can meet the requirement, the explicit value of L can be determined by performing several simulations
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