Robust control method for suppressing sub-synchronous oscillation of grid connection of doubly-fed wind farm

A sub-synchronous oscillation and robust control technology, applied in wind power generation, reducing/preventing power oscillation, electrical components, etc., can solve the problems that it is difficult to adapt to the requirements of power grid security, and the controller cannot always provide the best performance, so as to improve The effect of robustness

Inactive Publication Date: 2019-07-09
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

However, due to the uncertainties of the power system, these controllers cannot always provide the best performance
The subsynchronous oscillation analysis method and control measures based on the traditional deterministic system are difficult to meet the requirements of power grid security in the case of strong randomness and large fluctuation of new energy grid connection, and the problem of subsynchronous oscillation caused by it is becoming more and more prominent

Method used

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  • Robust control method for suppressing sub-synchronous oscillation of grid connection of doubly-fed wind farm
  • Robust control method for suppressing sub-synchronous oscillation of grid connection of doubly-fed wind farm
  • Robust control method for suppressing sub-synchronous oscillation of grid connection of doubly-fed wind farm

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Experimental program
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Effect test

Embodiment

[0067] figure 2 It is a system structure diagram of the four-machine two-zone system in the embodiment.

[0068] see figure 2 , two DFIGs are connected to the four-machine two-zone system, and the figure 2 The system conducts small disturbance stability analysis and obtains 7 oscillation modes. Table 1 is the system oscillation mode table. See Table 1. Modes 1-4 are SSO modes with relatively small damping and prone to subsynchronous oscillation.

[0069] Table 1 System Oscillation Mode

[0070] model characteristic root Oscillation frequency / Hz Damping ratio 1 -0.3269±90.6140j 14.42 0.0036 2 -0.1999±89.5245j 14.25 0.0022 3 -0.1684±74.8249j 11.91 0.0023 4 -0.4713±74.7438j 11.90 0.0063 5 -0.4780±13.4100j 2.13 0.0356 6 -0.5419±12.4654j 1.98 0.0434 7 -0.3612±6.4105j 1.02 0.0563

[0071] Damping controller design:

[0072] By changing the output of the two DFIGs, four operating points are obtained as verti...

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Abstract

The invention discloses a robust control method for suppressing the sub-synchronous oscillation of a grid connection system of doubly-fed wind turbines. The method comprises the following steps: A, establishing a state space description of a grid-connection system of doubly-fed wind turbines; B, establishing D-region stability constraints of hybrid H<2> / H<infinity>; C, establishing a convex polytope model containing different wind power operation conditions; and D, solving a state feedback matrix by using a linear matrix inequality to form a sub-synchronous oscillation robust damping controller. Through the robust control method for suppressing the sub-synchronous oscillation of a grid connection system of doubly-fed wind turbines, sufficient damping can be provided for the sub-synchronousoscillation mode of the system, and the controller also has a good control effect when the wind power changes in a large range.

Description

technical field [0001] The invention relates to the field of power systems, in particular to a robust control method for suppressing grid-connected sub-synchronous oscillations of doubly-fed wind farms. Background technique [0002] The increasing proportion of new energy in the power system has led to serious stability problems in the power system. Therefore, the power system stability problem caused by the access of new energy sources has received extensive attention. Wind energy is one of the best solutions for new energy generation. At present, the doubly fed induction generator (Doubly Fed Induction Generator, DFIG) is the mainstream type of wind power generation. The access of DFIG in the power system will cause subsynchronous interaction and cause subsynchronous oscillation (Subsynchronous Oscillation, SSO). In order to improve the stability and reliability of wind power integrated power system, it is necessary to conduct a more in-depth study on the phenomenon of ...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02J3/24
CPCH02J3/24H02J3/386H02J2203/20Y02E10/76
Inventor 王彤杨京
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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