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A Commutation Failure Prevention Method Based on DC Current Fuzzy Predictive Control

A DC current and fuzzy prediction technology, applied in AC network circuits, circuit devices, power transmission AC networks, etc., can solve the problems of slow recovery of DC system current, reduce DC current, etc., and achieve the effect of improving the ability to suppress commutation failure

Inactive Publication Date: 2017-05-03
HOHAI UNIV
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Problems solved by technology

[0004] The DC current predictive control method is currently a more advanced method to prevent commutation failures. However, the parameter k in the calculation formula of the DC current predictive setting value of this method has the limitation of random value selection, and because this method reduces the rectification side for a long time DC current, resulting in slow recovery of DC system current, therefore, this method needs to be further improved

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  • A Commutation Failure Prevention Method Based on DC Current Fuzzy Predictive Control
  • A Commutation Failure Prevention Method Based on DC Current Fuzzy Predictive Control
  • A Commutation Failure Prevention Method Based on DC Current Fuzzy Predictive Control

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Embodiment Construction

[0021] Below in conjunction with specific embodiment, further illustrate the present invention, should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention, after having read the present invention, those skilled in the art will understand various equivalent forms of the present invention All modifications fall within the scope defined by the appended claims of the present application.

[0022] figure 1 It is a structural block diagram of the existing CIGRE HVDC model control system including the DC current predictive control method, figure 2 It is a structural block diagram of the improved CIGRE HVDC model control system containing the method of the present invention. figure 1 The DC current prediction control module and the follow-up MIN selection module in the dotted line box need to be improved. The present invention replaces the original DC current prediction control module...

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Abstract

The invention discloses a commutation failure prevention method based on direct current fuzzy predictive control. In view of a direct current predictive control method in which limitation exists in a parameter k random value in a direct current predication setting valve calculation formula and direct current at a rectifier side is reduced for a long time, limitation of slow current recovery of the direct current system is caused, a fuzzy controller is adopted to control the direct current predication setting valve, a direct current fuzzy predictive control method is brought forward, a control time duration T selected via a simulation result is set, and the direct current at the rectifier side is only reduced with a time duration T after a CFPREV module detects failure happens to an alternating current system. Through modeling and simulation, compared with the prior direct current predictive control method, effectiveness of restraining the commutation failure ability by the HVDC (high-voltage direct current) system is verified to be enhanced.

Description

technical field [0001] The invention relates to a commutation failure prevention method based on DC current fuzzy predictive control, which belongs to the technical field of power system operation and control. Background technique [0002] High-voltage direct current (HVDC) transmission system has large transmission capacity, low loss, long service life, unlimited transmission distance, and no stability problem of AC transmission system. It is widely used in interconnection and submarine cable power transmission. With the development of the economy and the construction of the power grid, my country has become the country with the most direct current transmission lines and the largest direct current transmission capacity in the world. The resulting large-scale AC and DC power system is so complex and difficult to operate that it is rare in the world. [0003] One of the most common failures in HVDC systems is commutation failure. Commutation failure is not conducive to the...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/36
CPCH02J3/36H02J2203/20Y02E60/60
Inventor 孙国强高楷卫志农孙永辉楚云飞李逸驰
Owner HOHAI UNIV
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