Improved passive control system and method based on LCL filtering grid-connected inverter under complex power grid impedance

A technology of grid impedance and passive control, which is applied in single-network parallel feeding arrangements, AC networks to reduce harmonics/ripples, electrical components, etc., can solve problems such as interactive resonance, and achieve reduced resonance phenomena, small THD, The effect of simple system structure

Inactive Publication Date: 2021-01-22
SHANGHAI MARITIME UNIVERSITY
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Problems solved by technology

[0006] In order to solve the problem of mutual resonance between the LCL filter and the grid under the capacitive grid impedance, the present invention proposes an improved passive control system and method based on the LCL filter grid-connected inverter under the complex grid impedance

Method used

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  • Improved passive control system and method based on LCL filtering grid-connected inverter under complex power grid impedance
  • Improved passive control system and method based on LCL filtering grid-connected inverter under complex power grid impedance
  • Improved passive control system and method based on LCL filtering grid-connected inverter under complex power grid impedance

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Embodiment Construction

[0049] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form.

[0050] An improved passive control system based on an LCL filter grid-connected inverter under complex grid impedance, characterized in that it includes an AC power supply module, a voltage signal acquisition sensor, a phase-locked loop, a current signal acquisition sensor, a passive controller, an inverter Inverter, DC power supply, LCL filter;

[0051] The DC power supply is connected to the input side of the inverter with wires; the output side of the inverter is connected to the LCL filter with wires; the LCL filter is connected to the AC power supply with wires; the output side of the inverter is connected to the current signal acquisition and sensing wires; The power supply and the v...

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Abstract

The invention discloses an improved passive control system based on an LCL filtering grid-connected inverter under complex power grid impedance. The improved passive control system comprises an alternating current power supply module, a voltage signal acquisition sensor, a phase-locked loop, a current signal acquisition sensor, a passive controller, an inverter, a direct current power supply and an LCL filter. The method for controlling by using the improved passive control system based on the LCL filtering grid-connected inverter under the complex power grid impedance comprises the followingsteps: (1) establishing a circuit model; (2) carrying out coordinate transformation; (3) establishing an Euler-Lagrange passive system model; (4) defining a reference variable and an error amount; (5)injecting damping; (6) calculating a control rate; (7) establishing a system admittance model; (8) solving the output admittance of an inverter; (9) determining a damping r1 range; and (10) broadening a passive region. The method has the advantages of effectively reducing the resonance phenomenon, improving the system stability and robustness and the like.

Description

technical field [0001] The invention belongs to the technical field of power electronics nonlinear control, in particular to an improved passive control system and method based on an LCL filter grid-connected inverter under complex grid impedance. [0002] technical background [0003] In recent years, with the growth of power demand and the concern for environmental issues, the utilization of renewable energy based on wind energy and solar energy has attracted much attention. Grid-connected inverter system, as a key interface device for renewable energy and grid connection, converts DC voltage obtained from renewable energy into AC voltage, and a filter is connected to its output to filter out harmonics and inject high-quality power into the grid sinusoidal current. Generally, there are two types of filters (L and LCL) used to reduce the switching harmonics of the current injected into the grid. The third-order LCL filter is the most widely used topology because it has the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/01H02M7/5387H02M1/12H02J3/38
CPCH02J3/01H02J3/381H02M1/126H02M7/5387Y02E40/40
Inventor 黄敏章志诚陈凡张天明
Owner SHANGHAI MARITIME UNIVERSITY
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