Wind power converter hardware fault-tolerant control method

A wind power converter and fault-tolerant control technology, applied in the field of converters, can solve problems such as large application limitations, achieve the effect of making up for limitations, reducing the probability of mechanical damage and off-grid operation

Pending Publication Date: 2021-11-09
CHONGQING UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Software fault tolerance is popular for its advantages of simple control and low cost. However, its compensation effect on the fault vector sector is only effective for rectifiers, not for inverters, and has great application limitations.

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  • Wind power converter hardware fault-tolerant control method
  • Wind power converter hardware fault-tolerant control method
  • Wind power converter hardware fault-tolerant control method

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Embodiment Construction

[0063] Embodiments of the present invention are described below through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation modes, and various modifications or changes can be made to the details in this specification based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the diagrams provided in the following embodiments are only schematically illustrating the basic concept of the present invention, and the following embodiments and the features in the embodiments can be combined with each other in the case of no conflict.

[0064] Wherein, the accompanying drawings are for illustrative purposes only, and represent only schematic diagrams, rather than physical drawings, and should...

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Abstract

The invention relates to a wind power converter hardware fault-tolerant control method, which belongs to the technical field of converters. The method comprises the following steps of S1, realizing conversion from a three-phase six-switch working mode to a three-phase four-switch working mode when the RSC is in an open circuit, and deriving a rotor voltage space vector under a three-phase four-switch topology, S2, realizing control model conversion from a three-phase four-switch space vector modulation SVM algorithm during normal operation to a three-phase four-switch SVM algorithm during fault-tolerant topology, S3, judging whether to output the next vector state or not by comparing the magnitude of the cumulative sum of the pulse width modulation (PWM) sampling time and the voltage vector acting time, and S4, establishing a three-phase four-switch fault-tolerant control SVM algorithm under the condition of unbalanced capacitor voltage by compensating the voltage offset of the rotor reference voltage vector. According to the method, the limitation that the RSC fault sector cannot be subjected to software fault-tolerant compensation is made up, the fault-tolerant system operates stably, and the probability of mechanical damage and off-network operation of the system is reduced.

Description

technical field [0001] The invention belongs to the technical field of converters, and relates to a hardware fault-tolerant control method of a wind power converter. Background technique [0002] The converter is an important part of the doubly-fed wind turbine (Doubly-fed Wind Turbine, DFWT). The open-circuit fault of the power device causes the output voltage, current and power fluctuation of the DFWT, which seriously threatens the stable operation of the DFWT. The fault-tolerant control can reconfigure the topology of the converter or switch the control strategy according to the fault diagnosis results after the equipment fails, so as to realize the self-isolation of the fault, so that it can continue to run without stopping the equipment, thereby improving the DFWT Stability of grid-connected operation. [0003] The existing research on fault-tolerant control of wind power converters mainly includes software fault-tolerant and hardware fault-tolerant. Software fault to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02M1/32H02M7/797
CPCH02J3/381H02M1/32H02M7/797H02J2300/28Y02E10/76
Inventor 李辉谭宏涛周芷汀杨甜青和彭瀚峰姚然向学位赖伟全瑞坤
Owner CHONGQING UNIV
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