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Predictive direct power control method of three-phase grid connected rectifier based on extended state observer

A technology of expansion state and power control, applied in the direction of converting AC power input to DC power output, output power conversion device, AC network circuit, etc., can solve the problems of poor anti-interference performance, large overshoot, slow response speed, etc.

Active Publication Date: 2016-05-04
HARBIN INST OF TECH
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Problems solved by technology

[0005] The purpose of the present invention is to provide a three-phase grid-connected rectifier predictive direct power control method based on an extended state observer to solve the problem of poor anti-interference performance and poor response in the three-phase grid-connected rectifier predictive direct power control method in the prior art. The problem of slow speed and large overshoot

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Embodiment Construction

[0074] combine Figure 1~3 This embodiment is shown in the illustration, and the implementation process of the method for predicting direct power control of a three-phase grid-connected rectifier based on an extended state observer in this embodiment is described as follows:

[0075] The three-phase grid-connected rectifier model (three-phase grid-connected rectifier topology) in the present invention is as follows figure 1 Shown:

[0076] The system is connected to the power grid through the filter inductor Ls, the three-phase bridge rectifier realizes AC / DC (AC-DC) conversion, and the external load is connected in parallel with the DC side capacitor C. The system parameters are shown in Table 1:

[0077] Table 1 System parameters

[0078]

[0079]

[0080] Transformed by Pike, {} αβ =A{·} abc ,

[0081] in, A = 2 3 1 ...

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Abstract

The invention provides a predictive direct power control method of a three-phase grid connected rectifier based on an extended state observer, and belongs to the field of electronic power control technology. The predictive direct power control method is used for solving the problems of relatively poor anti-jamming performance, slow response speed and large overshoot of the predictive direct power control method of the three-phase grid connected rectifier in the prior art. The control of the predictive direct power control method provided by the invention is composed of two control rings: a voltage regulation ring is an outer ring and a power tracking ring is an inner ring. A PI controller is combined with the extended state observer to form the outer ring to resist external interference. Predictive control based on a system discrete time model forms the inner ring to directly control active power and reactive power. The extended state observer is added in the predictive direct power control, and the extended state observer deems the external interference as a new system state and estimates and compensates the new system state in a feedback manner. Practice proves that the extended state observer is a very effective manner of processing the system uncertainty and the external interference.

Description

technical field [0001] The invention relates to a method for predicting direct power control of a three-phase grid-connected rectifier, belonging to the technical field of power electronic control. Background technique [0002] Grid-connected rectifiers play an increasingly important role in industrial production, such as smart grids, electric vehicles, energy storage systems. The research on the modulation technology, topology and control algorithm of grid-connected converters has become a research hotspot in the field of power electronics. Fuzzy control, sliding mode control, and predictive control have been well applied to this circuit topology. Fuzzy control is suitable for situations where the system parameters are unknown. Sliding mode control has good robust performance, and its switching characteristics are naturally suitable for the control of power converter systems, but its high-frequency chattering cannot be suppressed, and it may even cause the system to lose ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02M7/219
CPCH02J3/381H02M7/219H02M7/2195
Inventor 吴立刚刘健行郭婷婷张岩
Owner HARBIN INST OF TECH
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