A control parameter optimization method to improve the ability of DC system to suppress commutation failure

A technology for commutation failure and parameter control, applied in electrical digital data processing, special data processing applications, instruments, etc., it can solve the problems of combining the accuracy of no actual model with the efficiency of optimization algorithms, and achieve optimization search, guarantee effect of accuracy

Inactive Publication Date: 2017-02-22
HOHAI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

None of the current optimization techniques combine the accuracy of the actual model with the efficiency of the optimization algorithm to achieve the parameter optimization of the DC control system

Method used

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  • A control parameter optimization method to improve the ability of DC system to suppress commutation failure
  • A control parameter optimization method to improve the ability of DC system to suppress commutation failure
  • A control parameter optimization method to improve the ability of DC system to suppress commutation failure

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Experimental program
Comparison scheme
Effect test

Embodiment

[0032] Embodiment: The cut-off angle γ depends on many factors, and its calculation formula is:

[0033]

[0034] In the formula, I d is the direct current, X c is the commutation reactance, U v is the direct conversion of the voltage on the AC system side of the converter transformer to the voltage on the valve side, and β is the inversion angle of the inverter side; it can be seen that the magnitude of the DC current is related to the change of the turn-off angle. This method uses the DC side current and the DC current setting value The difference between is the target optimal control parameter to meet the requirements of improving the ability to suppress commutation failure. The target optimal control index function is as follows:

[0035]

[0036] Taking the CIGRE HVDC Benchmark Model as the research model, adding the existing commutation failure prediction module based on the change value of voltage and current, and using this method based on the attached figure...

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Abstract

The invention discloses a control parameter optimization method for improving the phase commutating failure restraining capacity of a direct current system. The method comprises the following steps that after initialization, through an interface technology between PSCAD and MATLAB, a first interface module and a second interface module are established, the first interface module is used for calling an optimization algorithm, a whole iteration function of the algorithm is carried out, when each-time simulation is started, through an improved particle swarm algorithm, particle positions are updated, and controller parameters are returned to the PSCAD; and the second interface module is used for receiving the particle positions returned by the PSCAD and optimizing target functions after each-time simulation is over, and the global optimum particle positions and the individual optimum positions are updated. Through the interface technology between the PSCAD and the MATLAB, combining calling of the PSCAD and the MATLAB is achieved, the improved particle swarm algorithm is used for searching for the optimum control parameters, a multi-time operation function in the PSCAD is used, calling of multi-time software can be achieved, and accordingly optimization searching of control parameters is achieved.

Description

technical field [0001] The invention relates to the technical field of power system operation and control, and specifically designs a control method for suppressing commutation failure of a direct current transmission system. Background technique [0002] With the increase of AC transmission capacity, the increase of line distance and the complexity of power grid structure, problems such as system stability, short-circuit current limitation, and voltage regulation have become increasingly prominent. Especially in long-distance power transmission, in order to improve stability and transmission Capacity requires a large investment. However, DC transmission technology has something that AC transmission cannot replace, which makes DC transmission more and more applied in the power grid, and has a good development prospect. [0003] Commutation failure is the most common failure of inverters in DC transmission systems, and commutation failures are more likely to occur when the i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
Inventor 卫志农缪新民孙国强孙永辉袁阳任宾向育鹏
Owner HOHAI UNIV
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