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Grid-connected inverter resonance suppression circuit and method

A technology of resonance suppression and inverter, which is applied in the field of microgrid to achieve the effect of improving reliability and stability, reducing DC side voltage fluctuations and power loss problems, and solving resonance problems

Inactive Publication Date: 2021-11-26
NANJING INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a grid-connected inverter resonance suppression circuit and method, thereby solving the resonance problem of a multi-inverter parallel system under weak grid conditions

Method used

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  • Grid-connected inverter resonance suppression circuit and method
  • Grid-connected inverter resonance suppression circuit and method
  • Grid-connected inverter resonance suppression circuit and method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Such as figure 1 As shown, this embodiment provides a grid-connected inverter resonance suppression circuit, including back-to-back dual PWM converters, a power grid module, an AC bus, a public coupling point PCC located between the grid module and the AC bus, connected to the public The first sampling conditioning module of the coupling point PCC and the multi-inverter parallel system. A first filter is also set between the first converter and the AC bus, a second filter is also set between the second converter and the common coupling point PCC, and a second sampler is connected to the first converter. conditioning module.

[0046] The back-to-back dual PWM converter includes a first converter and a second converter whose DC terminals are connected to each other, the AC terminal of the first converter is connected to the AC bus, and the AC terminal of the second converter is connected to the common coupling point The control terminals of the PCC, the first converter ...

Embodiment 2

[0052] Such as figure 2 As shown, this embodiment provides a method for suppressing resonance of a grid-connected inverter, including the following steps:

[0053] Step 1. Obtain the real-time PCC voltage and PCC current of the common coupling point PCC through the first sampling conditioning module, and process to obtain the resonance voltage;

[0054] Step 2. Obtain the DC terminal voltage and AC terminal current of the first converter through the second sampling and conditioning module;

[0055] Step 3, using the AC / DC bidirectional conversion controller to generate a first modulation signal based on the DC terminal voltage and the AC terminal current of the first converter;

[0056] Step 4, reducing the influence of the circulating current between the back-to-back dual PWM converters and the AC bus on the multi-inverter parallel system through the first converter acting on the basis of the first modulation signal;

[0057] Step 5, generating a second modulation signal b...

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Abstract

The invention provides a grid-connected inverter resonance suppression circuit and method. The circuit comprises a back-to-back dual PWM converter, a power grid module, an AC bus, a point of common coupling PCC located between the power grid module and the AC bus, a first sampling conditioning module connected to the point of common coupling PCC, and a multi-inverter parallel system. The back-to-back double PWM current converter comprises a first current converter and a second current converter, the direct current ends of the first current converter and the second current converter are connected with each other, the alternating current end of the first current converter is connected to an alternating current bus, and the alternating current end of the second current converter is connected to a point of common coupling PCC. The control ends of the first current converter and the second current converter are respectively connected with an AC / DC bidirectional conversion controller, a second sampling conditioning module and a resonance controller. According to the method, resonance energy generated when the number of the grid-connected inverters is different can be effectively processed, voltage resonance generated by the multi-machine grid-connected inverters is effectively restrained, meanwhile, the problems of direct current side voltage fluctuation and power loss caused by power grid harmonic pollution can be reduced, and the reliability and stability of system work are improved.

Description

technical field [0001] The invention belongs to the technical field of micro-grids, and in particular relates to a resonance suppression circuit and method for a grid-connected inverter. Background technique [0002] Due to the gradual shortage of fossil energy, the development and utilization of renewable energy has become the key to alleviating the energy crisis. Therefore, people put forward the concept of micro grid. The microgrid is easy to control, can flexibly adjust the power generation according to the change of load, has high reliability, and can be connected to the grid or run independently. In the microgrid, random distributed power sources and energy storage devices are connected to the large power grid through inverters, which leads to the generation and application of multi-inverter parallel systems. The long-distance transmission lines required for power supply in remote areas and the increase in voltage transformation links cause the leakage reactance of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/01H02J3/38H02J3/24H02M1/12H02M7/5395
CPCH02J3/01H02J3/38H02J3/241H02M1/126H02M7/5395Y02E40/40Y02B70/10
Inventor 赵涛曹芸凯陈静张成徐友
Owner NANJING INST OF TECH