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Doubly fed induction generator multi-target optimization control method under voltage asymmetric sag

A technology for wind turbines and voltage asymmetry, which is applied to generator control circuits, wind power generation, and control of generators, etc. It can solve the problems of controlling a single target and unable to coordinately control multiple targets.

Inactive Publication Date: 2016-08-31
BAOJI UNIV OF ARTS & SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a multi-objective optimal control method for doubly-fed wind power generators under asymmetric voltage drop, which solves the problem that the existing doubly-fed wind power generators under unbalanced grid voltage can only control a single target and cannot coordinate and control multiple target problem

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  • Doubly fed induction generator multi-target optimization control method under voltage asymmetric sag
  • Doubly fed induction generator multi-target optimization control method under voltage asymmetric sag
  • Doubly fed induction generator multi-target optimization control method under voltage asymmetric sag

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Embodiment Construction

[0066] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0067] The structure of the doubly-fed wind power generation system adopted by the multi-objective optimal control method of the doubly-fed wind power generator under the voltage asymmetry drop provided by the present invention is as follows figure 1 As shown, among them, L s is the grid side filter inductance, L r is the rotor side filter inductance, C is the DC bus capacitance, V dc is the DC bus voltage. The converter directly connected to the rotor is called the rotor side converter (RSC for short), which can adjust the output active power and reactive power of the DFIG stator terminal by controlling the voltage fed into the DFIG rotor terminal. The other converter is called the grid side converter (grid side converter, referred to as GSC), which is connected to the rotor side converter through the DC bus, and its AC side is connected ...

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Abstract

The invention discloses a doubly fed induction generator multi-target optimization control method under voltage asymmetric sag, comprising: establishing a model; obtaining the relational expression between a power coefficient and stator flux linkage and rotor current; introducing an adjusting coefficient to obtain a rotor directive current unified formula; obtaining the relational expression between a stator current harmonic distortion and the adjusting coefficient, and the expression between a stator active and reactive fluctuation per unit value and the adjusting coefficient; and establishing and solving an adjusting coefficient alpha and beta multi-target optimization model. The method introduces the adjusting coefficient in calculating rotor directive current, establishes a rotor directive current adjusting efficient model by employing minimum active and reactive power fluctuations as a control target, and a stator current total harmonic distortion (THD) as a constraint condition, and employs a multi-target fuzzy optimization algorithm to optimize the current adjustment coefficient, thereby reducing active and reactive power fluctuations, limiting the THD in a safe range, and realizing doubly fed induction generator multi-target optimization control under unbalanced power grid voltage.

Description

technical field [0001] The invention belongs to the technical field of wind power generation, and in particular relates to a multi-objective optimization control method for a doubly-fed wind power generator under asymmetric voltage drop. Background technique [0002] The doubly fed induction generator (DFIG) system has been widely used due to its advantages of variable speed and constant frequency operation, active and reactive power decoupling control, small capacity of doubly fed converters, and energy four-quadrant operation. However, the stator side of the DFIG is directly connected to the grid. This structure cannot effectively isolate the connection between the DFIG system and the grid, making the wind turbine very sensitive to grid faults, resulting in weak fault ride-through capability of the DFIG grid. [0003] At present, scholars at home and abroad have conducted a lot of research on the design and optimization of fault ride-through methods for wind turbines. Amon...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/12H02J3/38H02P9/00H02P101/15
CPCH02J3/12H02J3/386H02J2203/20H02P9/007H02P2101/15Y02B10/30Y02E10/76
Inventor 张文娟马浩淼吴宏岐杨丽霞
Owner BAOJI UNIV OF ARTS & SCI