Island multi-inverter parallel sensor fault diagnosis method

A sensor fault, multi-inverter technology, applied in fault location, fault detection by conductor type, information technology support system, etc. fast effect

Pending Publication Date: 2020-11-17
TIANJIN UNIV OF SCI & TECH
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Problems solved by technology

Liu Huan and R. Sakthivel a studied the fuzzy observer of the T-S fuzzy control system respectively, and proved the asymptotic convergence of the control performance with the Lyapunov method. Robustness to closed-loop systems

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  • Island multi-inverter parallel sensor fault diagnosis method
  • Island multi-inverter parallel sensor fault diagnosis method
  • Island multi-inverter parallel sensor fault diagnosis method

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Embodiment Construction

[0037] Embodiments of the present invention are described in further detail below in conjunction with the accompanying drawings:

[0038] A fault diagnosis method based on T-S fuzzy fault-tolerant control for island multi-inverter parallel sensors figure 1 The schematic diagram of parallel operation of multiple inverters in the distributed microgrid is realized. The invention proposes a class of T-S fuzzy fault-tolerant control allocation method by establishing a mathematical model of a multi-inverter parallel system in an island operation mode under uncertain faults and faults. First of all, in order to solve the complex, uncertain, and unclear factors of the control system, the state equation of the multi-inverter parallel system is combined with T-S fuzzy theory to deal with the distributed micro-grid multi-inverter parallel nonlinear system, and establish a distributed micro-grid multi-inverter Inverter parallel system in island mode T-S fuzzy global mathematical model; S...

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Abstract

According to the method, a microgrid island multi-inverter parallel system under the influence of sensor faults is researched, and a nonlinear multi-inverter parallel system TS fuzzy model is established. A fuzzy proportional-integral observer is designed to effectively estimate the fault; meanwhile, a fuzzy special observer is adopted, and faults are detected and isolated through a residual reconstruction mechanism. And then, through established fuzzy Taylor series expansion and Lyapunov, sufficient conditions for verifying the stability of the system are proved, and the stability is proved.And finally, simulation is carried out in a Simulink environment, and the effectiveness of the fault diagnosis method is verified. The fault diagnosis method based on the island multi-inverter parallel sensor is reasonable in design, stable control under parameter uncertainty faults and actuator faults can be well achieved, good tracking performance and fault tolerance are shown, a new thought isprovided for design of a fault diagnosis system of the multi-inverter parallel sensor in an island mode, and the fault diagnosis method is suitable for large-scale popularization and application. Goodengineering application prospects are realized.

Description

technical field [0001] The invention belongs to the technical field of smart grids, in particular to a fault diagnosis method for parallel sensors of isolated island multi-inverters. Background technique [0002] Distributed microgrids generally adopt multi-inverter parallel connection, and MPP tracking is performed on the current control of the inverter system to realize the connection between the microgrid and the large power grid. At the same time, the voltage control of the inverter system is carried out to implement island operation. Adopting an effective control strategy to ensure the voltage stability of the inverter system is one of the key issues to realize the stable operation of the island distributed microgrid. The operating conditions of the island distributed microgrid are relatively complex, and it will suffer from many interferences during the operation process, including the interference from its own device parameters and the perturbation from external sens...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38G01R31/08
CPCH02J3/38G01R31/086Y04S10/52
Inventor 游国栋房成信王雪
Owner TIANJIN UNIV OF SCI & TECH
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