Particle swarm algorithm based VSC multi-target optimization direct power control method under imbalanced electrical network

A particle swarm algorithm and multi-objective optimization technology, applied in the field of power equipment control, can solve problems such as unfavorable power grid stable and reliable operation, unfavorable power grid reliable and stable operation, power grid current imbalance, etc.

A particle swarm algorithm and multi-objective optimization technology, applied in the field of power equipment control, can solve problems such as unfavorable power grid stable and reliable operation, unfavorable power grid reliable and stable operation, power grid current imbalance, etc.

CN103647467AActive Publication Date: 2014-03-19ZHEJIANG UNIV
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  • Particle swarm algorithm based VSC multi-target optimization direct power control method under imbalanced electrical network
  • Particle swarm algorithm based VSC multi-target optimization direct power control method under imbalanced electrical network
  • Particle swarm algorithm based VSC multi-target optimization direct power control method under imbalanced electrical network

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Embodiment Construction

[0053] In order to describe the present invention more specifically, the control method of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0054] Such as figure 1 As shown, a multi-objective optimization direct power control method of VSC under unbalanced power grid based on particle swarm optimization algorithm, including the following steps:

[0055] (1) Use the single-phase voltage Hall sensor 1 to collect the DC bus voltage V of the VSC dc , using the three-phase voltage Hall sensor 2 to collect the three-phase voltage V on the AC side of the VSC a ~V c and the three-phase grid voltage U a ~ U c , using the three-phase current Hall sensor 3 to collect the three-phase current I of the AC side of the VSC a ~I c ;

[0056] Then use the asymmetric phase-locked loop 4 to extract the three-phase grid voltage U a ~ U c The angular frequency ω and phase θ of .

[0057] And obtain the VSC ou...

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Abstract

The invention discloses a particle swarm algorithm based VSC multi-target optimization direct power control method under an imbalanced electrical network, which takes into consideration the output three-phase electrical network current, the output active power and the output reactive power of a VSC, enables the control performance of the three to simultaneously obtain multi-target optimization control, employs concise particle swarm algorithm codes, consumes quite short calculating time, facilitates realization in a real-time calculation aspect, can effectively improve the operation control performance of the VSC under imbalanced electrical network voltage conditions, and ensures the quality of electric energy and the stability and safety of en electrical power system. Moreover, a direct power control method is adopted in the invention so that the transient rapid response of a VSC system is ensured. At the same time, a vector proportion-integration adjustment technology or a proportion-integration resonance adjustment technology is adopted in the invention, and vector proportion-integration adjustment or resonance adjustment whose angular frequency doubles a fundamental frequency can inhibit unfavorable influences brought by negative phase-sequence components in electrical network voltage.

Description

technical field [0001] The invention belongs to the technical field of power equipment control, and in particular relates to a VSC multi-objective optimization direct power control method in an unbalanced power grid based on a 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...

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Application Information

Patent Timeline
19 Mar 2014
Publication
CN103647467A
IPC
H02M7/42; H02J3/38; G06N3/00
Inventors
年珩