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A current feedback active damping method for lcl type grid-connected single inverter

A single inverter and current feedback technology, applied in AC network circuits, irreversible DC power input conversion to AC power output, AC power input conversion to DC power output, etc., can solve the problem of reducing system bandwidth and inherent resonance peak The suppression effect is limited, and scholars put forward control schemes and other issues to achieve the effect of saving engineering costs

Active Publication Date: 2022-04-29
CENT SOUTH UNIV
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this control method is equivalent to an inductance on the inverter side in series with resistance and inductance. This scheme has limited suppression effect on the inherent resonance peak and will still reduce the system bandwidth.
[0012] Up to now, no scholars have proposed a better control scheme

Method used

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  • A current feedback active damping method for lcl type grid-connected single inverter
  • A current feedback active damping method for lcl type grid-connected single inverter
  • A current feedback active damping method for lcl type grid-connected single inverter

Examples

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Effect test

Embodiment

[0066] Modeling of LCL Grid-connected Inverter System

[0067] figure 1 The system structure of the voltage source grid-connected inverter using LCL filter is given. In the figure: Inverter side inductance L1, filter capacitor C and grid side inductance L2 form an LCL filter, i 1 and i 2 are inverter current and grid-connected current respectively, u c Is the voltage across the filter capacitor; Lg is the grid impedance. u dc is the DC side voltage; u inv and u g are the inverter side voltage and grid voltage, respectively. Its single-phase equivalent circuit is as figure 1 (b) shown.

[0068] Modeling and analysis of the single-phase equivalent circuit diagram can be obtained figure 2 The current closed-loop control block diagram.

[0069] When the parasitic resistance of the LCL filter itself is not considered:

[0070] K PWM is the equivalent gain of PWM, G PI is a PI controller, the expression is

[0071]

[0072] K P is the proportional coefficient, ...

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Abstract

The invention discloses an active damping method for current feedback of an LCL type grid-connected single inverter. The invention uses the inverter side current as a single current feedback point, and compares the passive damping scheme of the parallel resistors at both ends of the filter capacitor. An equivalent effective damping method based on inverter side current feedback is constructed. Compared with the existing active damping method, the method makes the system easier to stabilize without adding sensors, and at the same time does not affect the bandwidth of the system. In addition, from the perspective of damping coefficient ζ, the parameter design basis of this method is given. The simulation results verify the effectiveness and feasibility of the active damping control method proposed by the present invention.

Description

technical field [0001] The invention relates to an LCL type grid-connected single inverter current feedback active damping method. Background technique [0002] The global energy crisis and the intensification of environmental problems have stimulated the rapid development of wind power, photovoltaic and other renewable energy grid-connected technologies. As an important supplement to traditional large-scale centralized wind power plants, the distributed power generation technology of renewable energy has attracted widespread attention at home and abroad. As an important bridge and link between the grid and renewable energy, grid-connected inverters take on the role of transferring energy from distributed power sources to parallel grids, which can effectively reduce the impact of renewable energy grid-connected units on the grid and improve Power supply reliability and power quality are generally favored. [0003] In large-scale distributed power stations based on renewabl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/48H02M7/5387H02M1/12H02J3/38H02J3/01H02J3/40
CPCH02M7/48H02M7/5387H02M1/126H02J3/381H02J3/01H02J3/40H02J2300/22Y02E40/40
Inventor 于晶荣陈壮深周仁友张刚
Owner CENT SOUTH UNIV
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