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A single-phase harmonic resonance optimization suppression device and suppression method

A technology for suppressing devices and harmonics, applied in harmonic reducing devices, circuit devices, and AC networks to reduce harmonics/ripples, etc. Oscillation and other problems to achieve the effect of ensuring dynamic stability characteristics

Active Publication Date: 2022-02-11
HANGZHOU DIANZI UNIV
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  • Application Information

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Problems solved by technology

At the same time, due to the existence of line impedance and grid impedance, there are coupling phenomena between multi-parallel inverters and between inverters and the grid. This coupling phenomenon poses challenges to the stability of the grid-connected power generation system and the quality of output power.
In addition, due to the existence of a large number of harmonic sources in the grid-connected power generation system, it is easy to excite series or parallel resonance
In the distributed grid-connected power generation system, the occurrence of resonance may cause the oscillation of the inverter, which will affect the stability of the inverter group, and in serious cases will endanger the safe operation of the power system and cause transmission and distribution accidents.

Method used

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  • A single-phase harmonic resonance optimization suppression device and suppression method
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[0024] The specific implementation of the present invention will be further described in conjunction with the accompanying drawings and examples, but the protection scope of the present invention is not limited thereto. It should be pointed out that, if there are processes or symbols that are not specifically described in detail, those skilled in the art can understand and implement with reference to the prior art.

[0025] figure 1 It is a topological diagram of a specific circuit of a single-phase harmonic resonance optimization suppression device. The device is located at the PCC end of the inverter group and consists of series units and parallel units, and the series units and parallel units share a DC bus.

[0026] The specific connection method of the circuit is as follows: the main circuit includes three bridge arms a, b, and c, wherein the b bridge arm is the common bridge arm of the series unit and the parallel unit, and each bridge arm contains two controllable swit...

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Abstract

The invention discloses a single-phase harmonic resonance optimization suppression device and suppression method. In the distributed grid-connected power generation system, due to the coupling effect between multi-parallel inverters and between inverters and the grid, the system has the risk of mutual resonance instability. In the present invention, a single-phase harmonic resonance optimization suppression device based on low-voltage switching devices is added to the PCC end of the converter group, and the series unit and the parallel unit work together to realize the expansion of the passivity of the series-parallel impedance of the PCC end. Improve the self-discipline and stability range of multi-parallel inverter groups to achieve optimal suppression of harmonic resonance.

Description

technical field [0001] The invention belongs to the field of power electronics, and in particular relates to a single-phase harmonic resonance optimization suppression device and suppression method. Background technique [0002] With the deepening of the global energy crisis, new energy distributed grid-connected power generation technology has attracted much attention. Usually, in order to increase the capacity of the grid-connected power generation of the inverter, the inverter is connected to the grid in parallel. At the same time, due to the existence of line impedance and grid impedance, there are coupling phenomena between multi-parallel inverters and between inverters and the grid. This coupling phenomenon poses challenges to the stability of the grid-connected power generation system and the quality of output power. . In addition, due to the existence of a large number of harmonic sources in the grid-connected power generation system, it is easy to excite series or...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38H02J3/01H02J3/24
CPCH02J3/381H02J3/01H02J3/24H02J2300/20Y02E40/40
Inventor 何远彬吴圆圆张尧
Owner HANGZHOU DIANZI UNIV