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Variable coefficient underclocking model prediction direct power control method and device

A model prediction and power control technology, which is applied in the direction of output power conversion devices, circuit devices, AC power input conversion to DC power output, etc., can solve the problems of inability to adapt to system changes in real time, unstable power tracking, and increased system complexity, etc. problem, to achieve the effect of reducing the number of switching actions, reducing the switching frequency, and increasing the pertinence

Inactive Publication Date: 2017-10-20
JIANGSU UNIV
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Problems solved by technology

However, the frequency reduction model predicts direct power control braking, poor static performance, unstable power tracking, and cannot adapt to system changes in real time
The document "Multi-Objective Model-Predictive Control for High-Power Converters" provides power compensation for frequency reduction control, but it increases the complexity of the system and weakens the frequency reduction effect

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  • Variable coefficient underclocking model prediction direct power control method and device
  • Variable coefficient underclocking model prediction direct power control method and device
  • Variable coefficient underclocking model prediction direct power control method and device

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Embodiment Construction

[0047] 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.

[0048] Refer to attached figure 1 A schematic flow chart of an embodiment of the variable coefficient frequency reduction model prediction direct power control method provided by the present invention;

[0049] The variable coefficient frequency reduction model predicts the direct power control method, including:

[0050] S1. Obtain the output phase voltage e of the three-phase grid-connected inverter a 、e b 、e c and output phase current i a i b i c ;

[0051] S2, the sampled output phase voltage e a 、e b 、e c and output phase current i a i b i c , after 3 / 2 transformation, the voltage signal e in the two-phase stationary coordinate system is obtained α 、e β and the current signal i α i β ;

[0052] S3. ...

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Abstract

The invention discloses a variable coefficient underclocking model prediction direct power control method and device, and belongs to the electric power electron technical field; the method comprises the following steps: obtaining an output phase voltage and an output phase current of a three-phase grid connected inverter; converting the sampled phase voltage and phase current into a two-phase static coordinate system; calculating a variable coefficient underclocking model prediction direct power control object function J value corresponding to each output vector; determining the minimum value Jmin of the object function J values; obtaining the switch state combination of the vector corresponding to the minimum value Jmin, thus realizing the variable coefficient underclocking model prediction direct power control of the three-phase grid connected inverter. The method can effectively reduce the switch frequency while stably tracking the three phase grid connected inverter active power and reactive power, can reduce the switch loss, and has very well dynamic and static state performances.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a method and device for predicting direct power control by a variable coefficient down-frequency model. Background technique [0002] Model predictive direct power control evaluates the switch combinations corresponding to each output vector online according to the objective function, and selects the switch combination that can satisfy the minimum objective function to realize the control of the inverter. Model predictive direct power control is widely accepted for its simplicity of algorithm, fast dynamic response, and flexible control. However, the model predicts that direct power control requires a high sampling frequency, which causes a lot of switching losses. The frequency reduction model predicts that the direct power control is to add the switching function to the objective function, which is used to reduce the switching frequency. However, the frequency reduc...

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Application Information

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IPC IPC(8): H02J3/38H02M7/5387
CPCH02J3/383H02M7/53871H02J2203/20H02M1/0048H02M7/53876Y02B70/10Y02E10/56
Inventor 廖志凌崔清华徐长波
Owner JIANGSU UNIV
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