Multi-target control method for VSC (voltage source converter) under unbalanced power grid based on particle swarm algorithm

A particle swarm algorithm and control method technology, applied in the field of power electronic equipment control, can solve problems such as unfavorable stable and reliable operation of power grid, reliable and stable operation of unfavorable power grid, unbalanced power grid current, etc.
CN103427697AActive Publication Date: 2013-12-04ZHEJIANG UNIV
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
ZHEJIANG UNIV
Publication Date
2013-12-04

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Abstract

The invention discloses a multi-target control method for a VSC (voltage source converter) under an unbalanced power grid based on a particle swarm algorithm. The multi-target control method gives consideration to output three-phase power grid current, output active power and output reactive power of the VSC, control performances of the output three-phase power grid current, the output active power and the output reactive power can be controlled in a multi-target optimized manner, codes of the particle swarm algorithm are simplified, computing time is short, real-time computing can be realized, the running control performance of the VSC under the condition of unbalanced power grid voltage can be effectively improved, and quality of electric energy and stability and safety of an electric power system are ensured. By the aid of vector proportional-integral control or proportional-integral resonance control technology, angular frequency is obtained by performing vector proportional-integral control or resonance control on double fundamental frequency, and negative influence caused by negative sequence components in the power grid voltage can be restrained.
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Description

technical field

[0001] The invention belongs to the technical field of power electronic equipment control, and in particular relates to a multi-objective control method of VSC under unbalanced power grid based on particle swarm algorithm. Background technique

[0002] Nowadays, as a simple and reliable power electronic device, VSC (Voltage Source Converter) is widely used in actual power grids. The most common devices are grid-side converters used in wind power generation systems, and Grid-side converters, active power filters and power factor correction devices to ensure safe and reliable operation of the grid, etc. However, the VSC operating under the condition of unbalanced grid voltage will show unbalanced three-phase output current, output active power, reactive power oscillation and other operational performance deterioration. The deterioration of the above performance indicators will cause adverse effects such as grid current harmonic injection and grid power oscilla...

Claims

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