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Predictive current control method for cascaded brushless doubly-fed generator under unbalanced load

A technology for predicting current and balancing load, applied in motor generator control, electronic commutation motor control, control system, etc., can solve problems such as system output voltage imbalance

Active Publication Date: 2019-05-17
浙江中欣航电装备制造有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] Aiming at the defects of the prior art, the purpose of the present invention is to propose a predictive current control technology for cascaded brushless doubly-fed motors under unbalanced load, aiming at solving the problem of unbalanced system output voltage when the system load is unbalanced and faulty

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  • Predictive current control method for cascaded brushless doubly-fed generator under unbalanced load
  • Predictive current control method for cascaded brushless doubly-fed generator under unbalanced load
  • Predictive current control method for cascaded brushless doubly-fed generator under unbalanced load

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Embodiment Construction

[0080] In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0081] The invention provides a set of predictive current control strategy of cascaded brushless doubly-fed motors to ensure that the output three-phase voltage is balanced when the unbalanced fault occurs in the three-phase load, so that the non-faulty load can have a balanced voltage supply.

[0082] In order to ensure high-quality power supply to non-faulty loads and to eliminate the influence of negative sequence voltage when the cascaded brushless doubly-fed power generation system loads unbalanced faults, the present invention is based on the commonly used control in the independent power g...

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Abstract

The invention discloses a predictive current control method for a cascaded brushless doubly-fed generator under unbalanced load. According to the method, positive and negative sequence components of the output voltage are obtained on the basis of positive and negative sequence separation, the positive sequence controls the voltage output amplitude, and the negative sequence control eliminates theinfluence of the negative sequence voltage, so that a control winding current reference value is obtained; and on this basis, the predictive current control is adopted to control the positive sequenceand negative sequence of the system, so that the complexity of a control algorithm is reduced, and the negative sequence voltage generated by the unbalanced load can be effectively inhibited, and thesafety and stability of the system are improved.

Description

technical field [0001] The invention belongs to the technical field of motor control, and in particular relates to an unbalanced load control method of a brushless doubly-fed motor. Background technique [0002] Cascaded brushless doubly-fed generator (cascaded brushless doubly-fed generator, CBDFG) uses a special rotor winding structure to cancel the brushes and slip rings of traditional brushed motors, and at the same time takes into account that the brushless doubly-fed generator requires only a frequency converter The advantage of slip times power capacity reduces maintenance and operating costs while improving the reliability of motor operation, so it has broad application prospects in power generation systems. [0003] In stand-alone power generation applications, unbalanced loads or non-linear loads occur from time to time, and uneven load distribution of each phase in a three-phase system or load faults may cause load unbalanced conditions. At this time, the zero-se...

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Application Information

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IPC IPC(8): H02P9/00H02P21/22
Inventor 张德斌于宁洪玮戎兵
Owner 浙江中欣航电装备制造有限公司