An adaptive pi control method to improve hvdc system's ability to suppress commutation failure

A control method and commutation failure technology, applied in the field of adaptive PI control, can solve problems such as complex fuzzy logic operations, and achieve the effect of satisfying fast response, overcoming complex operations, and simple operation logic

Inactive Publication Date: 2016-10-12
HOHAI UNIV
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Problems solved by technology

[0005] However, in the existing adaptive controllers used in HVDC systems, the self-tuning controller needs to rely on the reference model, while the adaptive PI controller based on fuzzy logic has complex fuzzy logic operations, and it is necessary to judge the type of fault before proceeding. Select the corresponding optimal control method and fuzzy logic according to the list, so it is difficult to apply to actual engineering, and the ability to resist commutation failure is relatively low

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  • An adaptive pi control method to improve hvdc system's ability to suppress commutation failure
  • An adaptive pi control method to improve hvdc system's ability to suppress commutation failure
  • An adaptive pi control method to improve hvdc system's ability to suppress commutation failure

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[0029] The technical solution will be described in detail below in conjunction with the drawings:

[0030] Such as figure 1 As shown, the control structure block diagram of the existing CIGRE HVDC power transmission system, the method provided by the present invention will perform a PI controller (named PI_r) on the rectifier side and two PI controllers on the inverter side (named respectively as PI_ia, PI_ib) make improvements.

[0031] Such as figure 2 As shown, the control structure block diagram of the CIGRE HVDC power transmission system after the PI controller controlled by the method of the present invention is adopted. among them:

[0032] The control parameter of PI controller PI_r on the rectifier side is set to K p_r , K i_r , The measurement signal S used for adaptive adjustment of the controller m (t), expected signal S ss (t) and reference signal S ref (t) Take the measured value I of the rectifier side DC current respectively d_rec , DC current setting value of re...

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Abstract

The invention discloses a self-adaption PI control method for improving HVDC system suppressing phase commutation failure capacity. A self-adaption controller is used to replace a PI controller with fixed parameters in the HVDC system, the flexibility of an HVDC controller coping with different operation conditions of the system can be improved, therefore, the robustness of the system is improved, and the phase commutation failure is suppressed. By the adoption of the discretization derivation self-adaption PI controller based on the operational formula of the PI controller, the limitations that an existing self-tuning controller relies on a reference model, a fuzzy self-adaption PI controller is complex in operation, furthermore, the failure type needs to be judged at first and then an optimum control mode is chosen are broken.

Description

Technical field [0001] The invention belongs to the technical field of power system operation and control, and particularly relates to an adaptive PI control method for improving the ability of an HVDC system to suppress commutation failure. Background technique [0002] The high-voltage direct current (HVDC) system has large transmission capacity, low loss, and flexible and rapid transmission power adjustment. Therefore, it is widely used in long-distance large-capacity transmission, interconnection of large-scale grids, and cross-strait transmission. [0003] Commutation failure is one of the most common faults on the inverter side of the HVDC system. Its occurrence process is as follows: AC system failure on the inverter side causes a decrease in the AC voltage amplitude, a sudden increase in DC current, or a phase angle shift at the zero-crossing point of the AC commutation voltage. As a result, the inverter shut-off angle is reduced, and the converter valve does not have enoug...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/36
CPCH02J3/001H02J3/36Y02E60/60
Inventor 孙国强高楷卫志农孙永辉楚云飞陈胜
Owner HOHAI UNIV
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