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LCL (Lower Control Unit) filtering controlled rectifying active damping control method of electric currents on feedback variable current side

A technology of active damping and control methods, applied in the direction of converting AC power input to DC power output, electrical components, output power conversion devices, etc., can solve problems such as easy amplification of high-frequency noise and inaccurate reconstruction results, and achieve harmonic Less wave content, beneficial to filter integration, and controllable power factor

Inactive Publication Date: 2013-07-03
CHINA UNIV OF MINING & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method introduces a differential link, which easily amplifies high-frequency noise, resulting in inaccurate reconstruction results

Method used

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  • LCL (Lower Control Unit) filtering controlled rectifying active damping control method of electric currents on feedback variable current side
  • LCL (Lower Control Unit) filtering controlled rectifying active damping control method of electric currents on feedback variable current side
  • LCL (Lower Control Unit) filtering controlled rectifying active damping control method of electric currents on feedback variable current side

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Experimental program
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Embodiment 1

[0050] Embodiment 1: The method has six steps in total, including: 1. Acquisition of grid voltage vector angle; 2. Current detection and coordinate transformation; 3. Control of DC voltage; 4. Control of AC current; 5. Active damping 6. Voltage space vector generation; the specific steps are as follows:

[0051] Step 1. Sampling the two-phase grid voltage, transforming it into the two-phase stationary coordinate system, and further obtaining two DC components of the grid voltage in the synchronous rotating coordinate system, and obtaining the grid voltage vector angle (θ) through a software phase-locked loop (7). ;

[0052] Step 2, sampling the two-phase rectification side current, according to the grid voltage vector angle (θ) obtained in step 1, to obtain two DC components of the rectification side current in the synchronous rotating coordinate system;

[0053] Step 3: compare the sampled DC voltage component with the given DC voltage, and obtain the given active current th...

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Abstract

The invention relates to a LCL (Lower Control Unit) filtering controlled rectifying active damping control method of electric currents on a feedback variable current side, belonging to an active rectifying method of power electronics. The method comprises the following steps: a direct current voltage control unit is used for finishing the control on a direct current voltage and producing d-shaft active currents of an electric current control unit; a q-shaft current given is used for controlling reactive components of a rectifier; a soft phase locking unit is used for locking a power grid voltage phase position and realizing the synchronous rotational transformation of the power-grid voltage and sampling currents on the variable current side; the current given and a sampling actual value are fed into the electric current control unit; the output quantity of the electric current control unit is accumulated with the electric current on the variable current side which is fed back by usinga first-order high-pass filter to generate the given quantity of a voltage space vector unit; and finally, the voltage space vector unit generates six PWM (Pulse-Width Modulation) signals to finish the control on the rectifier. The method solves the stability problem of a LCL (Low Control Unit) filtering voltage type controlled rectifier and realizes the control of the rectifier on direct-currentvoltages and currents on line side under the condition that the electric current or voltage detection of a capacitor branch is not needed.

Description

technical field [0001] The invention relates to an active rectification method of power electronics, in particular to an active damping control method of an LCL filter controllable rectifier that feeds back the current on the converter side. Background technique [0002] The three-phase grid-connected converter has the advantages of low output current harmonic content, adjustable power factor and bidirectional flow of energy. It is small in size and light in weight. It is widely used in grid-connected power generation and other fields of renewable energy. [0003] However, the harmonic frequency of the switching frequency or the integer multiple of the switching frequency generated by the converter is low. After the harmonic enters the power grid, it will have a certain impact on the grid load that is sensitive to harmonic interference, and even damage the equipment in severe cases. In order to obtain low harmonic distortion (THD) grid current, the output filter of the grid...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/24H02M7/217
Inventor 王颖杰伍小杰夏帅符晓于月森周娟耿乙文周书颖潘庆山李小强赵文瀚
Owner CHINA UNIV OF MINING & TECH
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