Passive filter parameter design method based on multi-objective optimization algorithm

A multi-objective optimization, passive filter technology, used in harmonic reduction devices, AC networks to reduce harmonics/ripples, etc., to save design cycles and improve filtering effects.

Inactive Publication Date: 2012-02-29
WISDRI ENG & RES INC LTD
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Problems solved by technology

[0004] The invention proposes a passive filter parameter optimization design method based on a multi-objective optimization algorithm. This method mainly solves the problem of mi

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  • Passive filter parameter design method based on multi-objective optimization algorithm
  • Passive filter parameter design method based on multi-objective optimization algorithm
  • Passive filter parameter design method based on multi-objective optimization algorithm

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Embodiment

[0030] A rolling mill power supply system in a steel mill such as figure 1 shown, where Z 1 is the equivalent impedance of the power supply cable, the cable is 650 meters long, and the cross-sectional area of ​​the copper core is 1500mm 2 , The short-circuit capacity of the rolling mill system is 590MVA, and the bus voltage U=10kV.

[0031] After actual testing, it is found that node 1 mainly includes harmonics of the 2nd to 49th order, and the magnitude of the harmonic current is shown in the attached image 3 shown. It can be seen from the figure that the 5th, 7th, 11th, and 13th harmonics of the system are relatively large, and the voltage distortion rate is 1.15%. According to actual needs, 4 sets of filters are loaded at node 1 to eliminate the 5th, 7th, and 11th harmonics. and the 13th harmonic, the equivalent impedance of the filter bank is Z f , and according to the actual situation of the system, the filter bank needs to provide 4000kvar of reactive power.

[003...

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Abstract

The invention provides a passive filter parameter design method based on a multi-objective optimization algorithm. The method is characterized by: firstly, analyzing and establishing a topology structure model of an electric power system; regarding a reactive power capacity which can be compensated for the electric power system as a constraint condition, taking a size of each harmonic current of a filtering channel and a voltage distortion rate as an optimization object so as to obtain a constrained multi-objective optimization problem; finally, using a genetic algorithm to solve the constrained multi-objective optimization problem and optimally calculating so as to obtain a Pareto optimal solution set with various kinds of characteristics which can be selected by a designer. By using the method of the invention, during designing the passive filter of the electric power system, a minimization problem of the each harmonic current of the filtering channel and the voltage distortion rate can be solved and the passive filter can be guaranteed to acquire the best filtering effect.

Description

technical field [0001] The invention relates to a parameter optimization design method of a passive filter in a power supply system. technical background [0002] With the development of industry and life, the increasing number of power electronic equipment has brought serious harmonic pollution to the power quality of the power grid, which has a great impact on the safe and economical operation of the power system. For harmonic control in power systems, filter parameters are usually selected based on engineering experience to design passive filters for filtering and reactive power compensation, and it is difficult to obtain the minimum voltage distortion rate in terms of filtering effect. [0003] In order to obtain the best filtering effect, designers apply genetic algorithm to the power system to optimize the design of passive filter parameters, such as the multi-objective optimization algorithm that takes the investment cost of passive filter, reactive power compensation...

Claims

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Application Information

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IPC IPC(8): H02J3/01
CPCY02E40/40
Inventor 张华军谢德华张洁
Owner WISDRI ENG & RES INC LTD
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