Resonance control system of inverter grid-connected system

A resonance control and inverter technology, applied in the direction of single grid parallel feeding arrangement, etc., can solve the problem that the multi-inverter grid-connected system is easy to cause resonance, and achieve the effect of ensuring safe and stable operation and suppressing the system resonance phenomenon.

Pending Publication Date: 2019-12-20
NANJING NARI SOLAR ENERGY TECH +1
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Problems solved by technology

[0003] The purpose of the present invention is to provide a resonance control system for an inverter grid-connected system to solve the defect in the prior art that the multi-inverter grid-connected system easily causes resonance during operation

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  • Resonance control system of inverter grid-connected system
  • Resonance control system of inverter grid-connected system

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Embodiment Construction

[0015] In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific embodiments.

[0016] Such as Figure 1 to Figure 2 as shown,

[0017] A resonance control system for an inverter grid-connected system, the system including an inverter grid-connected system and a grid module connected to the inverter grid-connected system;

[0018] A resonance information extraction unit that is connected to the inverter grid-connected system and obtains a voltage resonance frequency therefrom;

[0019] A centralized passive resonance suppression module that is respectively connected to the resonance information extraction unit and the inverter grid-connected system and configured according to the obtained voltage resonance frequency.

[0020] Resonance information extraction is mainly based on voltage / current sampling combined with wavelet ...

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Abstract

The invention discloses a resonance control system of an inverter grid-connected system. The voltages uapcc, ubpcc and ucpcc of a common connection point (PCC) of a multi-inverter grid-connected system are sampled, and a resonance information extraction unit is used for obtaining the sampled voltage resonance frequency omega<r> at the PCC point, so a centralized passive resonance suppression device composed of a high-pass filter is reasonably configured at a PCC point of a multi-inverter grid-connected system according to the obtained voltage resonance frequency information, thereby increasingthe damping of the multi-inverter grid-connected system at the resonant frequency, and improving the operation stability margin of the system; meanwhile, the centralized passive resonance suppressiondevice only needs to be operated at the PCC, the hardware and software of all grid-connected inverters do not need to be changed, and the system is high in reliability, easy to configure, suitable for on-site large-scale application and the like.

Description

technical field [0001] The invention relates to the field of distributed power generation and microgrid, in particular to a resonance control system of an inverter grid-connected system. Background technique: [0002] With the global energy crisis and environmental problems becoming increasingly prominent, distributed power generation technology and micro-grid technology have received more and more attention. As the link between distributed resources and distribution network (micro-grid), grid-connected inverter Transducers play a key role in energy conversion. Due to the continuous expansion of the application scale of grid-connected inverters, the number of parallel-connected inverters in the same grid-connected system is gradually increasing, which seriously affects the stability of the multi-inverter grid-connected system, especially with The inverter of the LCL output filter is very easy to cause the resonance of the multi-inverter system. Contents of the invention ...

Claims

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Application Information

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IPC IPC(8): H02J3/38
CPCH02J3/38
Inventor 徐高晶韦徵田新全类永超杨林盛光宗
Owner NANJING NARI SOLAR ENERGY TECH
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