Wind power converter hardware fault-tolerant control method

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...

AI Technical Summary

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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