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Suppression method and device for resonance of distributed photovoltaic power generation system

A technology of photovoltaic power generation system and suppression device, which is applied to harmonic reduction devices and AC networks to reduce harmonics/ripples, etc., and can solve problems such as resonance that affects system stability

Active Publication Date: 2015-09-16
SUNGROW POWER SUPPLY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of this, the present invention provides a method and device for suppressing resonance of a distributed photovoltaic power generation system to solve the problem of resonance that affects system stability in the prior art

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  • Suppression method and device for resonance of distributed photovoltaic power generation system
  • Suppression method and device for resonance of distributed photovoltaic power generation system
  • Suppression method and device for resonance of distributed photovoltaic power generation system

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Embodiment Construction

[0047] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0048] The invention provides a method for suppressing resonance of a distributed photovoltaic power generation system to solve the problem in the prior art that resonance that affects system stability is likely to occur.

[0049] Specifically, such as figure 2 As shown, the method for suppressing the resonance of the distributed photovoltaic power generation system includes:

[0050] S101. Receive sampled data, and perform harmonic extraction ...

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Abstract

The invention discloses a suppression method and device for resonance of a distributed photovoltaic power generation system. The suppression method comprises the following steps of: receiving sampling data and extracting harmonic wave from the sampling data; judging whether the distributed photovoltaic power generation system occurs resonance according to a result by harmonic extraction; generating and outputting a control signal when resonance is judged to happen; and adjusting the working frequency of the distributed photovoltaic power generation system to make the working frequency and the resonant frequency of the resonance staggered; therefore, resonance is suppressed, and stable system running is further guaranteed.

Description

technical field [0001] The invention relates to the technical field of photovoltaic power generation systems, in particular to a resonance suppression method and device for a distributed photovoltaic power generation system. Background technique [0002] The distributed photovoltaic power generation system in the prior art consists of a pre-stage intelligent combiner box and a post-stage centralized inverter. The front-stage intelligent combiner box is connected to the rear-stage centralized inverter through a relatively long cable. Due to the parasitic inductance L of the cable S and other parameters, so that a CLC multi-stage network is formed at the interface between the front-stage intelligent combiner box and the rear-stage centralized inverter, such as figure 1 As shown, the CLC multi-stage network includes the equivalent output capacitance C of the equivalent smart combiner box pvbox-o , the parasitic inductance L of the cable S and the DC input capacitor C of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/01
CPCY02E40/40
Inventor 潘年安程林孙龙林陶磊
Owner SUNGROW POWER SUPPLY CO LTD