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Self-adaption PI control method for improving HVDC system suppressing phase commutation failure capacity

A commutation failure and control method technology, applied in the field of power system operation and control, can solve problems such as complex fuzzy logic operations, and achieve the effects of fast response, simple operation logic, and flexible adjustment

Inactive Publication Date: 2015-06-24
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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  • Self-adaption PI control method for improving HVDC system suppressing phase commutation failure capacity

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Embodiment Construction

[0029] Below in conjunction with accompanying drawing, technical scheme is described in detail:

[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 control a PI controller (named as PI_r) on the rectification side in the figure and two PI controllers (named as PI_r) on the inverter side (named respectively PI_ia, PI_ib) to improve.

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

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

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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 in particular relates to an adaptive PI control method for improving the ability of HVDC systems to suppress commutation failure. Background technique [0002] High-voltage direct current (hereinafter referred to as HVDC) system has large transmission capacity, low loss, and flexible and rapid adjustment of transmission power. Therefore, it is widely used in long-distance large-capacity power transmission, regional power grid interconnection, and cross-strait power transmission. [0003] Commutation failure is one of the most common faults on the inverter side of the HVDC system, and its occurrence process is as follows: a fault in the AC system on the inverter side causes a decrease in the amplitude of the AC voltage, a sudden increase in the DC current, or a shift in the phase angle of the zero-crossing point of the AC commutation voltage. As a result, the cut-off...

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Application Information

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Patent Type & Authority Applications(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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