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A Dual Current Feedback Control Method Applied to Bidirectional Grid-Connected Converter

A feedback control and converter technology, which is applied in the field of dual current feedback control, can solve the problems affecting the stable operation of the system, increasing the harmonic amplitude of grid-connected current, etc., achieve good high-frequency harmonic suppression ability, and reduce grid-connected current Harmonics, reducing the effect of PI regulation

Active Publication Date: 2021-12-17
XIAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with L and LC filters, the LCL filter is small in size and has good high-frequency filtering effect, which can reduce the cost in practical applications, but its own high-order characteristics will cause resonance phenomenon, which will increase the grid-connected current at a specific frequency. Harmonic amplitude, affecting the stable operation of the system

Method used

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  • A Dual Current Feedback Control Method Applied to Bidirectional Grid-Connected Converter
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  • A Dual Current Feedback Control Method Applied to Bidirectional Grid-Connected Converter

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Embodiment Construction

[0047]The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0048] A dual current feedback control system applied to a two-way grid-connected transducer, such as figure 1 As shown, including the converter topology circuit and the control circuit, wherein the specific structure of the topology circuit is: three-phase AC / DC converter, the converter is built from 6 IGBTs and 6 anti-parallel diode tubes, three-phase AC / DC converter DC side via a steady capacitor C dc Connected to the DC bus, the three-phase AC / DC converter AC side is connected to the AC grid through the LCL filter, where the LCL filter contains inductance L on the three-phase AC / DC converter side. 1 , Filter capacitance C and inductance L connected to the AC grid 2 ;

[0049] Control circuit includes: improved salary control calculation, its input is the actual value of DC bus voltage U dc DC bus voltage rating U N , Output is output I L...

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Abstract

The invention discloses a dual-current feedback control method applied to a bidirectional grid-connected converter, specifically as follows: firstly, according to the principle that the power on both sides of the AC and DC of the three-phase AC / DC converter is equal, the DC bus voltage U dc and three-phase AC / DC converter AC side current i L Substituting the mathematical relationship into the droop control equation, the AC side current i of the three-phase AC / DC converter is obtained L Calculate the equation; then add an active damping feedback loop to the control of the bidirectional grid-connected three-phase AC / DC converter to eliminate the resonance effect generated by the LCL filter. The method of the invention optimizes the DC bus voltage control effect by improving the traditional droop control. The grid-connected current feedback active damping method is used to suppress the resonance, reduce the harmonics of the grid-connected current and improve the system robustness. Through the combination of improved droop control and active damping feedback control, two-way control on both AC and DC sides of the grid-connected converter is formed.

Description

Technical field [0001] The present invention belongs to the technical field and grid current control, and particularly relates to a dual bidirectional current feedback applied to a control method of the network switch. Background technique [0002] With the large number of mining of primary energy use, not only Earth's environment has been seriously polluted conventional energy, coal, oil, natural gas, also depleted, and therefore, as many of its alternative renewable clean energy sources such as solar, wind, etc. gained wide pay attention to. Based on this rapid development of distributed generation technologies, provide important support for large power grid. However, since the intermittent renewable energy sources and volatility, there are some challenges of distributed power grid in the direct process. Microgrid is a distributed power supply, energy storage system, the energy conversion means, monitoring and protection devices, small load, etc. made from pooled with electrici...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38H02J3/01H02J1/00H02J5/00
CPCH02J3/381H02J3/01H02J1/00H02J5/00H02J2300/26H02J2203/20Y02E40/40Y02E10/56
Inventor 支娜赵佳宝明旭李宁
Owner XIAN UNIV OF TECH
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