A Genetic Algorithm-Based Allocation Method for Phase Shift Angle Optimal Allocation of Joint Operation of Public Network/Isolated Network

Abstract

A genetic algorithm-based method for optimally allocating phase-shifting angles for joint operation of a public network / solitary network belongs to the field of power generation. The steps of the method are: designing the fitness function; randomly initializing a variety of phase-shift angle combinations of rectifier units, and ensuring that the initialization values ​​are within the actual operating range; respectively calculating the fitness function values ​​under various corresponding harmonic value combinations, from Select the superior individual in the group, eliminate the inferior individual, and carry out the selection operation; carry out the cross operation on the combination retained in the previous step, replace and recombine part of the structure of the two parent individuals to generate a new individual; repeat the above steps , until the fitness function value converges, the optimal combination of phase shift angles is obtained to ensure the minimum amount of harmonics. By adopting this method, the analysis of the most and even phase angle distribution mode of the rectifier unit under the joint operation state of the isolated grid / public network can be realized, so as to ensure the minimum harmonic component and reduce the impact on the related electrical equipment of the public network / isolated network.

Description

technical field [0001] The invention relates to the field of power generation, in particular to a method for optimally allocating phase-shifting angles in public network / isolated network joint operation. Background technique [0002] In an ideally pure electrical system, both current and voltage are pure sine waves. In fact, non-sinusoidal currents are formed when current flows through a load that does not have a linear relationship with the applied voltage. In a simple circuit containing only linear elements (inductors, capacitors, and resistors), the current flowing is proportional to the applied voltage, so if the applied voltage is sinusoidal, the current flowing will be sinusoidal. It should be pointed out that in the case of reactive components, when there is a relative shift in the phase of voltage and current, the power factor becomes lower, but the line is still linear. Any periodic waveform can be divided into a fundamental frequency sinusoid plus a number of sin...

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Problems solved by technology

[0014] The present invention is aimed at the current situation that the harmonic content in the isolated grid system exceeds the standard, and then causes the insulation aging and damage of electrical equipment and protection devices in the isolated grid system, resulting in protection malfunctions and other situations, which affect the operation safety of the isolated grid system

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