L-capacitance-L (LCL)-filtering-based controlled rectifier parameter identification method

A parameter identification and rectifier technology, which is applied in the field of controllable rectifier parameter identification based on LCL filtering, can solve problems such as inaccurate system orientation, out-of-control startup, too many controllable rectifier sensors, etc., to achieve accurate observation and facilitate stable operation Effect

Inactive Publication Date: 2012-01-04
CHINA UNIV OF MINING & TECH +1
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Problems solved by technology

[0005] The purpose of the present invention is to provide a controllable rectifier parameter identification method based on LCL filtering, which solves the problem of excessive controllable rectifier sensors based on LCL filtering, inaccurate system orientation, and start-up loss of control after using no-voltage sensor control

Method used

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  • L-capacitance-L (LCL)-filtering-based controlled rectifier parameter identification method
  • L-capacitance-L (LCL)-filtering-based controlled rectifier parameter identification method
  • L-capacitance-L (LCL)-filtering-based controlled rectifier parameter identification method

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Embodiment 1

[0040] Embodiment 1: The controllable rectifier parameter identification method based on LCL filtering includes five steps: 1. Acquisition process of short-circuit current; 2. Parameter identification based on genetic algorithm; 3. Acquisition of the initial phase angle of the power grid at startup ;4. Real-time estimation of grid virtual flux linkage value under LCL filter condition; 5. Acquisition of system orientation angle under LCL filter condition;

[0041] Specific steps are as follows:

[0042] Step 1. The process of obtaining medium and short-circuit current is:

[0043] Step 1.1, sampling the DC bus voltage, which is the voltage obtained by uncontrollable rectification at this time;

[0044] Step 1.2. Send a zero-vector signal (0, 0, 0) or (1, 1, 1) with a duration of T to the 6 power devices of the three-bridge rectifier circuit, which is equivalent to all the upper or lower bridge arms of the rectifier circuit Short circuit, at this time the circuit is equivalent...

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Abstract

The invention discloses an L-capacitance-L (LCL)-filtering-based controlled rectifier parameter identification method, which belongs to a parameter identification method suitable for LCL filtering. The LCL-filtering-based controlled rectifier parameter identification method comprises the five following steps of: 1, acquiring short-circuit current; 2, performing genetic-algorithm-based parameter identification; 3, acquiring an initial phase angle of a power grid in starting; 4, estimating a virtual power grid flux linkage value in real time under LCL filtering condition; and 5, acquiring an orientation angle of a system under the LCL filtering condition. The method has the advantages that: 1, parameters of the power grid are identified by adopting a genetic algorithm, so an initial virtual flux linkage value and phase of the power grid can be more accurately observed, and the steady starting of a rectifier is realized; 2, the resonance frequency of an LCL filter is obtained in combination with inductance in the power grid, and a reliable basis is provided for the resonance suppression of the LCL filter; and 3, accurate virtual power grid flux linkage orientation is provided for the sensorless running of the LCL-filtering-based controlled rectifier, and the stable running of the system can be controlled.

Description

technical field [0001] The invention relates to a parameter identification method suitable for inductance-capacitance-inductance (LCL) filtering, in particular to a controllable rectifier parameter identification method based on LCL filtering. Background technique [0002] The three-phase grid-connected converter has the advantages of sinusoidal output current, low harmonic content, adjustable power factor and bidirectional flow of energy. It is small in size and light in weight, and is a real "green power converter". It is widely used in the fields of active power filter (APF), unified power flow control (UPFC), superconducting energy storage (SMES), high-voltage direct current transmission (HVDC), power transmission, and grid-connected power generation of renewable energy such as solar energy and wind energy. . With the implementation of the national "Twelfth Five-Year Plan", energy conservation and emission reduction efforts continue to increase and the demand for green ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/36H02M7/12G06N3/12
Inventor 伍小杰王颖杰宗伟林戴鹏夏帅王贵峰吴玮周书颖陆平袁庆庆吴迪
Owner CHINA UNIV OF MINING & TECH
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