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A method and apparatus for predictive power control of a doubly fed machine

A technology of predictive power control and doubly-fed motors, which is applied in the direction of generator control circuits, circuit devices, control systems, etc., can solve problems such as shortages, achieve sine distortion, improve steady-state performance, and eliminate double-frequency fluctuations Effect

Active Publication Date: 2019-01-11
NORTH CHINA UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

However, there is still a lack of application of this new type of power definition in the field of doubly-fed machine predictive control to simplify the control strategy of doubly-fed machines in unbalanced grids and improve their steady-state performance

Method used

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  • A method and apparatus for predictive power control of a doubly fed machine
  • A method and apparatus for predictive power control of a doubly fed machine
  • A method and apparatus for predictive power control of a doubly fed machine

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Embodiment Construction

[0041] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0042] Such as figure 1 As shown, it is a flow chart of an embodiment of the doubly-fed machine predictive power control method provided by the present invention, including:

[0043] Step 101, using the doubly-fed machine mathematical model to generate a traditional active power differential expression and an extended reactive power differential expression for the traditional active power expression and the extended reactive power expression, the steps include:

[0044] Set sub voltage as u s , the stator current is i s ;

[0045] Let the traditional active power be denoted as P s , the extended reactive power is expressed as

[0046] According to the mathematical model of doubly-fed motor, the traditional active p...

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Abstract

The invention discloses a predictive power control method and a device of a doubly-fed machine, which comprises the following steps: utilizing the expression of the traditional active power and the expression of the extended reactive power to combine the mathematical model of the doubly-fed machine to generate the expression of the traditional active power differential and the expression of the extended reactive power differential; Using a first order Euler discrete method to discretize the obtained differential expression and calculate a next time power value from the current time power value; Calculating a target rotor voltage vector reference value according to the obtained next time power value by using a deadbeat predictive power control method; By using space vector pulse width modulation (SVPWM) technology, three voltage vectors required for the reference value of the target rotor voltage vector and their action time are obtained, and finally the driving signal for driving the inverter switch transistor is obtained.

Description

technical field [0001] The invention relates to the field of double-fed motor wind power generation, in particular to a doubly-fed motor predictive power control method and device. Background technique [0002] Traditional doubly-fed motor control is usually based on an ideal grid. When an unbalanced fault occurs, the grid will generate a negative sequence component, resulting in a negative sequence component in the stator voltage, stator current and rotor current, and a large electromagnetic torque. Pulsation, the power delivered to the grid oscillates. Therefore, it is necessary to study the high-performance control strategy of DFIG under unbalanced grid to eliminate the negative sequence current in the stator and rotor windings or suppress the double frequency fluctuation of active power and reactive power. [0003] At present, there are many documents related to the doubly-fed motor control strategy under unbalanced power grid, such as "Direct Power Control of Doubly-Fe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02P9/00H02P9/10H02P101/15
CPCH02J3/386H02P9/007H02P9/105H02P2101/15Y02E10/76
Inventor 张永昌焦健徐东林
Owner NORTH CHINA UNIVERSITY OF TECHNOLOGY
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