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Control method and device for pwm rectifier based on model predictive control

A model predictive control and rectifier technology, which is applied in the direction of output power conversion device, AC power input conversion to DC power output, electrical components, etc., can solve the problem of not being able to control the system to achieve the best performance, so as to reduce the program running time, The effect of reducing power ripple and reducing complexity

Active Publication Date: 2018-10-23
NORTH CHINA UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

However, in special cases, the combination of optimal voltage vector and zero vector cannot make the performance of the control system optimal

Method used

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  • Control method and device for pwm rectifier based on model predictive control
  • Control method and device for pwm rectifier based on model predictive control
  • Control method and device for pwm rectifier based on model predictive control

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Embodiment Construction

[0059] 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.

[0060] Refer to attached figure 1 , is a schematic flowchart of an embodiment of a method for controlling a PWM rectifier based on model predictive control provided by the present invention.

[0061] The PWM rectifier control method based on model predictive control includes:

[0062] Step 101: Calculate and predict the active power and reactive power at the next moment according to the sampled grid voltage, grid current and rectifier AC side voltage at any current moment;

[0063] Step 102: Combining model predictive control and direct current control, using the negative value of the complex power conjugate as a variable in the predictive model, using a fast vector selection method to determine the sector at one time to...

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Abstract

The invention discloses a PWM (Pulse-Width Modulation) rectifier control method and a PWM rectifier control device based on model prediction control. The PWM rectifier control method comprises the following steps: calculating and predicating active power and reactive power of the next moment; combining the model prediction control and direct current control; taking a negative value conjugated with complex power in a prediction model as a variable, and judging a sector of the variable for one time by adopting a rapid vector selection method to obtain an optimal voltage vector; dividing the judged sector into two small parts by taking the position of a reference complex power vector as the standard; selecting a suboptimum voltage vector according to the position of the reference complex power vector; and calculating acting time of the optimal voltage vector and the suboptimum voltage vector in a control period to obtain a driving signal of a switching tube. The invention further discloses a PWM rectifier control method based on the model prediction control. The PWM rectifier control method and the PWM rectifier control device provided by the invention have the characteristics of small calculation amount, easiness in realization, rapid dynamic responses, good stable-state performance and the like.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a PWM rectifier control method and device based on model predictive control. Background technique [0002] With the development of power electronics technology, PWM rectification control technology has become the key to obtain high power factor and low harmonic components. Under ideal grid voltage, the classic control methods of PWM rectifier include: grid voltage oriented control (voltage oriented control, VOC) and direct power control (direct power control, DPC). VOC is a vector control method based on synchronous rotating coordinates. The system adopts a voltage and current double closed-loop structure, and uses a linear PI controller to achieve precise current control and decoupling control of active and reactive power. However, the performance of VOC mainly depends on the adjustment of PI parameters, the control is more complicated, and the dynamic response is slo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/219
Inventor 张永昌彭玉宾
Owner NORTH CHINA UNIVERSITY OF TECHNOLOGY
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