A power control method and system for a rotor side converter of a wind power generator
A technology for rotor-side converters and wind turbines, which is applied in control systems, wind power generation, and control of generators to achieve the effect of being simple and easy to implement and control.
Active Publication Date: 2022-05-17
YANCHENG INST OF TECH
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Problems solved by technology
However, the traditional predictive power control method has a major disadvantage: the cost function requires the design of weighting factors
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[0053] The invention proposes a power control method for a rotor-side converter of a wind power generator. The method is applied to a wind power generator. Through the power control method disclosed in the invention, the power of the rotor-side converter of a wind power generator can be efficiently and stably realized. control.
[0054] In this embodiment, both the power control method and the power control system are implemented based on wind power generators. However, the focus of the present invention is the execution steps of the power control method and the composition of the power control system for realizing the method. Therefore, in this embodiment, only a few parts related to the present invention are briefly described for the structure of the wind power generator, and the description about the structure of the wind power generator should not be used as a limit to the protection scope of the present invention.
[0055] In addition, the word "connection" appearing in ...
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The invention discloses a power control method for a converter on the rotor side of a wind power generator, and relates to the technical field of wind power generation conversion technology. The method mainly includes: adopting two cost functions without weighting factors, introducing adjustable parameters of the constrained parameters of the cost function, giving the predicted value of the stator active power and the predicted value of the stator reactive power, and judging that the two cost function constraints are satisfied Conditional rotor voltage vector reference value, and then the optimal rotor voltage vector reference value is obtained through the optimization module, and based on the optimal rotor voltage vector reference value, the drive signal of the switch tube of the wind turbine rotor side converter is obtained through the SVPWM module to realize wind power Power control of generator rotor side converter. In the power control technology adopted by the present invention, the two cost functions do not need to design weighting factors, and are simple and easy to implement.
Description
technical field [0001] The invention relates to the technical field of wind power generation conversion technology, in particular to a power control method for a rotor side converter of a wind power generator. Background technique [0002] Traditional power control methods for wind turbines are based on hysteretic controllers and switch tables for power control to keep stator active and reactive power as close as possible to their given values. However, the hysteresis controller will cause the switching frequency of the converter to be unstable, which makes it difficult to design the output filter of the converter. Furthermore, the use of a hysteretic controller and a pre-defined switching table for power control will inevitably lead to a non-optimal voltage vector selection in terms of minimizing power error, power ripple, and current harmonic ratio. [0003] Predictive power control method is one of the important research results in the field of wind turbine power control...
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IPC IPC(8): H02P9/00H02M7/48H02P101/15
CPCH02P9/00H02M7/48H02P2101/15Y02E10/76
Inventor 李小凡李慧媛张兰红
Owner YANCHENG INST OF TECH