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Load-shedding wind turbine variable-speed adjustable-pitch coordinated optimization frequency control method

A wind turbine, frequency control technology, applied in wind power generation, single grid parallel feeding arrangement, etc., can solve the problems of secondary frequency drop, poor frequency control effect, unstable operation of wind turbine, etc., and achieve good frequency control effect. , optimize the effect of speed and pitch angle control

Active Publication Date: 2019-11-08
NORTH CHINA ELECTRIC POWER UNIV (BAODING) +1
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Problems solved by technology

The key to realize the frequency control of the wind turbine is to coordinate the output power and mechanical power of the wind turbine, otherwise it will easily cause the unstable operation of the wind turbine or cause the secondary frequency to drop; however, there is no effective solution at present, resulting in poor frequency control effect

Method used

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  • Load-shedding wind turbine variable-speed adjustable-pitch coordinated optimization frequency control method
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  • Load-shedding wind turbine variable-speed adjustable-pitch coordinated optimization frequency control method

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Embodiment Construction

[0018] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0019] The embodiment of the present invention provides a variable speed and pitch coordinated and optimized frequency control method for load-reduced wind turbines. The related control framework is as follows figure 1 As shown, it mainly includes two parts: load shedding control and frequency modulation control; among them:

[0020] Load shedding control: Calculate the load shedding rate of wind turbines, thereby dividing the wind speed into multi...

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Abstract

The invention discloses a load-shedding wind turbine variable-speed adjustable-pitch coordinated optimization frequency control method. The method comprises steps: load-shedding control is carried out: the load-shedding rate of the wind turbine is calculated, a wind speed is thus divided to multiple wind speed intervals, and according to different wind speed intervals and partial frequency modulation control results, different load-shedding control strategies are adopted for the wind turbine, wherein frequency modulation control comprises parameter optimization and frequency control; in the case of parameter optimization, the reference values of a rotation speed and a pitch angle of the wind turbine are calculated based on the mechanical power of the wind turbine and the actual additionalpower, thereby realizing pitch angle control; and in the case of frequency control, by using the rotation speed reference value calculated by parameter optimization and the actual additional power ofthe wind turbine, wind turbine output power control is realized, and the corresponding control result is also used in a load-shedding control stage. The method can enable the wind turbine to accuratedetermine a load-shedding strategies at all wind speeds, rotation speed and pitch angle control is optimized, and better frequency control results are thus obtained.

Description

technical field [0001] The invention relates to the technical field of active power control of wind power generation, in particular to a method for controlling the coordinated optimization frequency of variable speed and pitch of a load-shedding wind turbine. Background technique [0002] In recent years, the penetration rate of wind power in the power system has been increasing. Compared with traditional synchronous generators, wind turbines are connected to the grid through power electronic devices and cannot respond to changes in system frequency. An increase in the proportion of wind power will reduce the system's inertial response and primary frequency regulation capability, and increase the demand for reserve capacity. In addition, wind turbines usually operate in the state of maximum power tracking (MPPT), and it is difficult to adjust the frequency of the system through power generation. In order to ensure the safe and stable operation of the power system, it is ne...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/48H02J3/38
CPCH02J3/48Y02E10/76
Inventor 胥国毅李海峰胡家欣金涛毕天姝
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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