Method for suppressing power grid low-frequency oscillation of doubly-fed wind generator based on auto-disturbance rejection control

A technology of active disturbance rejection control and active disturbance rejection controller, applied in wind power generation, reducing/preventing power oscillation, electrical components, etc., can solve problems such as poor control effect, improve accuracy, reduce burden, and improve system damping Effect

Active Publication Date: 2017-07-25
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

Classical PID and traditional PSS are the most widely used control methods at present, but the controller designed based on a certain operation mode may have poor control effect when the system parameters change

Method used

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  • Method for suppressing power grid low-frequency oscillation of doubly-fed wind generator based on auto-disturbance rejection control
  • Method for suppressing power grid low-frequency oscillation of doubly-fed wind generator based on auto-disturbance rejection control
  • Method for suppressing power grid low-frequency oscillation of doubly-fed wind generator based on auto-disturbance rejection control

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Embodiment Construction

[0055] The specific embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0056] Step 1. Use power system simulation software to build a detailed model of the grid-connected power system including doubly-fed wind farms;

[0057] figure 1 It is a block diagram of the overall control system of the doubly-fed wind turbine. A doubly-fed wind power generation system includes a wind turbine controller, a converter controller, and a grid-connected controller. The wind turbine controller includes two coupled mechanical controls: pitch angle control and maximum power tracking control. The inverter control on the machine side adopts stator flux linkage orientation to realize decoupling and independent control of stator active power and stator reactive power. In the power outer loop, the reference value of stator active power It is given by the maximum power tracking control (MPPT) in the wind turbine control la...

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Abstract

The invention belongs to the field of power systems, and in particular to a method which uses an additional damping controller to modulate active and reactive output of a doubly-fed wind generator to increase low-frequency oscillation damping of a grid connection power system of a large-scale wind farm. According to the invention, the method uses auto-disturbance rejection control technology, introduces the theory of data driving control, engineers an additional damping controller of the wind generator, and makes feature signal of the connecting points of a wind farm as input of the additional damping controller which outputs a signal to be added to active and reactive modulation quantity of a machine side current converter. According to the invention, simulation of the method proves that negative damping low frequency oscillation and forced power oscillation are better controlled, and the method has stronger robustness and engineering practicality. The invention provides a novel method for adjusting parameters of a state observer of a second-order non-linear auto-disturbance controller based on broadband concept.

Description

technical field [0001] The invention belongs to the field of power systems, and in particular relates to a method for suppressing low-frequency oscillation of a power grid by a doubly-fed wind turbine based on active disturbance rejection control. Background technique [0002] As the global population growth and economic development continue to increase the demand for energy, the problems of energy shortage and environmental pollution faced by traditional energy sources have become increasingly prominent. Coal, oil, and natural gas, as the three main energy sources in the world today, may be gradually exhausted in the next 40-200 years. In order to alleviate the increasingly serious energy crisis and environmental pollution, many countries regard the large-scale development of wind power as an important choice to cope with climate change and improve the energy structure. During the "Eleventh Five-Year Plan" period, my country's wind power has developed rapidly. The installe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/24H02J3/38H02J3/00
CPCH02J3/00H02J3/24H02J3/386H02J2203/20Y02E10/76
Inventor 马燕峰刘海航
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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