LPV Model Based Sensor Fault Diagnosis and Isolation for Permanent Magnet Synchronous Generator in Wind Energy Conversion Systems

Abstract

This paper deals with the current sensor fault diagnosis and isolation (FDI) problem for a permanent magnet synchronous generator (PMSG) based wind system. An observer based scheme is presented to detect and isolate both additive and multiplicative faults in current sensors, under varying torque and speed. This scheme includes a robust residual generator and a fault estimation based isolator. First, the PMSG system model is reformulated as a linear parameter varying (LPV) model by incorporating the electromechanical dynamics into the current dynamics. Then, polytopic decomposition is introduced for H ∞ design of an LPV residual generator and fault estimator in the form of linear matrix inequalities (LMIs). The proposed gain-scheduled FDI is capable of online monitoring three-phase currents and isolating multiple sensor faults by comparing the diagnosis variables with the predefined thresholds. Finally, a MATLAB/SIMULINK model of wind conversion system is established to illustrate FDI performance of the proposed method. The results show that multiple sensor faults are isolated simultaneously with varying input torque and mechanical power.

Design of State-Feedback Controllers for Linear Parameter Varying Systems Subject to Time-Varying Input Saturation

“…The term 2αP can be added to the inequalities (16) to ensure a guaranteed decay rate of the derivative of the Lyapunov function, which can be used to tune the closed-loop transient properties [24], thus obtaining (13).…”

“…The direct consequence of introducing the above mentioned scheduling parameters is that the closed-loop system becomes a parameter-varying system and the design conditions can be determined within the framework of linear parameter varying (LPV) systems [15,16]. Notably, many nonlinearities can be represented as varying parameters that depend on endogenous signals, for example, states and inputs [17], which broadens the applicability of the design methodology to nonlinear plants.…”

Special Issue on ‘Large Grid-Connected Wind Turbines’

“…This is critical because the shutdown of a megawatt class wind turbine causes considerable revenue loss. The current sensor fault diagnosis and isolation problem for a permanent magnet synchronous generator (PMSG) based wind system is presented in [14], by Zhimin Yang, Yi Chai, Hongpeng Yin and Songbing Tao. In [15], Bin Li, Junyu Liu, Xin Wang and Lili Zhao discussed the protection issues of wind turbines using the doubly fed induction generator.…”

HVDC Transmission Technology of Wind Power System with Multi-Phase PMSG

“…The design, characteristic analysis, and control of wind power systems, based on permanent magnetic synchronous generator PMSG, have been studied recently [2][3][4][5]. The conventional transmission method for offshore wind farm is high voltage AC (HVAC) transmission [6]. The voltage of PMSG is converted to a fixed frequency fixed magnitude voltage with the help of a back-to-back voltage source converter (VSC), and is then boosted to a relative high voltage by a transformer [7].…”