A dfig rotor-side converter fault ride-through control method using additional compensation terms
A rotor-side converter and control method technology, applied in the field of DFIG rotor-side converter fault ride-through control, can solve the problems of low accuracy, fixed method, lack of flexibility, etc., and achieve high reliability, easy engineering implementation, and control method simple effect
Active Publication Date: 2022-08-02
TAIYUAN UNIV OF TECH
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Problems solved by technology
During a fault, the commonly used mathematical model is no longer applicable. To adopt a control strategy, an accurate mathematical model of the doubly-fed motor must be established during the fault period, which is difficult for a highly coupled, nonlinear, multivariable system such as a doubly-fed motor Use precise mathematical formulas to express the variables during the fault, so the general fault ride-through methods of double-fed motors are limited by this, resulting in low accuracy, fixed methods, and lack of flexibility
Method used
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Embodiment Construction
[0063] like Figure 1 to Figure 9 As shown, the specific steps of the DFIG rotor-side converter fault ride-through control method using additional compensation terms provided by the present invention are as follows: figure 1 On this basis, the mathematical model of the rotor-side converter power outer loop is established as follows:
[0064] Set the terminal power error as:
[0065] or
[0066] In the above formula, P 1 and Represent the actual value and the given value of the output active power of the DFIG stator terminal, Q 1 and Represent the actual value and the given value of the output reactive power at the stator end of the DFIG respectively. Since the design ideas of the active power and reactive power sliding mode controllers are exactly the same, the following takes the active power as an example.
[0067] The sliding mode surface equation of the power outer ring system is selected as:
[0068]
[0069] In the formula, C is a constant greater than 0....
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The invention provides a fault ride-through control method for a DFIG rotor-side converter using an additional compensation item, belonging to the technical field of control of the rotor-side converter of a doubly-fed wind generator; the technical problem to be solved is: to provide a DFIG rotor with an additional compensation item The improvement of the structure of the fault ride-through control method of the side converter; the technical solutions adopted to solve the above technical problems are: establishing the mathematical model of the power outer loop of the DFIG rotor-side converter; establishing the mathematical model of the current inner loop of the DFIG rotor-side converter; The rotor current and rotor voltage are input variables, and the additional compensation term is used as the output variable. The fuzzy control is used to realize the control of the additional compensation term. The additional compensation term is used to change the structure of the current inner loop, and the rotor current inner loop control structure after the additional compensation is changed. Input SVPWM to realize the control of the rotor-side converter. The present invention is applied to a double-fed wind power generator.
Description
technical field [0001] The invention provides a fault ride-through control method for a DFIG rotor-side converter using an additional compensation term, and belongs to the technical field of a DFIG rotor-side converter fault ride-through control method using an additional compensation term. Background technique [0002] As the proportion of DFIG's installed capacity in large power grids continues to rise, its impact on grid reliability and power quality is becoming more and more profound. The reliability of the power grid will be out of operation, and the reliability of the power grid may also cause a larger area of off-grid accidents. If the unit remains connected to the grid, it will pose a threat to the safety of the unit itself. To solve this problem, the fault ride-through capability It has become an essential requirement for wind turbines. [0003] When the power grid fails and falls, the transient process of the DFIG system is relatively short and severe, and vario...
Claims
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IPC IPC(8): H02J3/38H02P9/00H02P21/00H02P101/15
CPCH02J3/381H02P9/007H02P9/006H02P21/0003H02P21/001H02P21/0007H02J2300/28H02J2203/20H02J2203/10H02P2101/15
Inventor 赵荣理杨琦王国君李岚
Owner TAIYUAN UNIV OF TECH