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Method of extracting grid-connected electronic power equipment output direct current component

A technology of power electronic devices and DC components, which is applied to output power conversion devices, electrical components, etc., can solve the problems of extra occupation of control chip resources, increase the complexity of hardware conditioning circuits, etc., to achieve effective control, save control chip resources, high precision effect

Active Publication Date: 2016-03-30
江苏中天互联科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although avoiding the detection of the output DC component, it also increases the complexity of the hardware conditioning circuit and requires additional control chip resources

Method used

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  • Method of extracting grid-connected electronic power equipment output direct current component
  • Method of extracting grid-connected electronic power equipment output direct current component

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Such as figure 1 As shown, when the three-phase grid-connected inverter is in normal operation, the instantaneous values ​​Ia, Ib, and Ic of the sampled AC current are detected. According to the current command values ​​Idref and Iqref in the two-phase rotating coordinate system calculated by the current control loop, after the conversion from the two-phase rotating coordinate system to the stationary coordinate system, the instantaneous value of the AC current in the stationary coordinate system is obtained, which is the approximate AC current Power frequency components IA, IB, IC. After the two correspond to make a difference respectively, that is, Ia-IA, Ib-IB, Ic-IC, the corresponding three-phase error value is obtained. Use the MATLAB filter design tool to select a single-point band-stop filter, that is, a notch filter, and select appropriate parameters such as sampling frequency, amplitude attenuation at the notch frequency, and bandwidth. The three-phase corres...

Embodiment 2

[0034] Such as figure 2 As shown, when the three-phase grid-connected inverter is in normal operation, the instantaneous values ​​Ia, Ib, and Ic of the sampled AC current are detected. According to the current command values ​​Idref and Iqref in the two-phase rotating coordinate system calculated by the current control loop, after the conversion from the two-phase rotating coordinate system to the stationary coordinate system, the instantaneous value of the AC current in the stationary coordinate system is obtained, which is the approximate AC current Power frequency components IA, IB, IC. After the two correspond to make a difference respectively, that is, Ia-IA, Ib-IB, Ic-IC, the corresponding three-phase error value is obtained. Use the MATLAB filter design tool to design a low-pass filter. Here, select the second-order Eliptic filter, and compare and determine the characteristic parameters such as sampling frequency, passband frequency, conduction and cutoff assignment a...

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Abstract

The invention discloses a method of extracting a grid-connected electronic power equipment output direct current component. Alternating-current instantaneous values are collected. An alternating-current power frequency component is calculated. The alternating-current power frequency component is subtracted from the alternating-current instantaneous values to acquire an error value of the two. Low pass filtering is performed on the error value to weaken a high frequency component. The error value after the low pass filtering is input into a power frequency wave trap so as to acquire a direct current component output by grid-connected electronic power equipment. By using the method in the invention, implementation is simple; chip resources are saved and controlled; high precision is possessed; through an existing direct current component control method, effective control of the direct current component can be realized.

Description

technical field [0001] The invention relates to a method for extracting components of power equipment, in particular to a method for extracting DC components output by grid-connected power electronic devices, and belongs to the technical field of power electronics. Background technique [0002] In the standards for power electronic equipment incorporated into the national grid, it is clearly required that the output DC component must be within a reasonable range. Therefore, it is necessary to add DC component control. [0003] At present, most grid-connected power electronic devices use DC component hardware sampling circuits to directly detect the output DC component, and then use traditional PI control to control the DC component within the standard range. Although the DC component hardware sampling circuit adopted can detect the real-time DC component more accurately, the design of this type of sampling circuit is complicated, and it usually belongs to a high-order filte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/00
CPCH02M1/00H02M1/0003
Inventor 熊俊峰李俊芝徐金城徐小飞马晓聪
Owner 江苏中天互联科技有限公司
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