IV curve scanning method and optical storage system

A scanning method and technology of optical storage system, applied in the monitoring of photovoltaic systems, photovoltaic power generation, photovoltaic modules, etc., can solve the problem of incomplete IV curve and achieve the effect of complete scanning

Pending Publication Date: 2021-01-08
HEFEI SUNGROW RENEWABLE ENERGY SCI & TECH CO LTD
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Problems solved by technology

[0003] Although the photovoltaic over-allocation can reduce the cost of electricity of the photovoltaic inverter system, when the above-mentioned photovoltaic inverter system performs IV scanning, that is, dynamically changes the load of the photovoltaic array to obtain a set of I and V data, if the input If the power exceeds the rated power Pn of the AC output of the inverter, the inverter will enter the power-limiting state to limit the power of the photovoltaic inverter system, so that the scanned IV curve is as follows: figure 2 As shown, only the ab segment and the cd end are included, and the IV curve is not complete
[0004] In addition, when the conventional photovoltaic inverter system operates in the power-limited mode, there will also be the above-mentioned incomplete IV curve problem.

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  • IV curve scanning method and optical storage system

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Embodiment Construction

[0054] The following will clearly and completely describe the technical solutions in the embodiments of the application with reference to the drawings in the embodiments of the application. Apparently, the described embodiments are only some of the embodiments of the application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of this application.

[0055]In this application, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any relationship between these entities or operations. an actual relationship or order. Moreover, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article or apparatus comprising a set of elements incl...

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Abstract

The invention provides an IV curve scanning method and an optical storage system. The IV curve scanning method is applied to an optical storage system with an inverter DC bus coupled with an energy storage unit. According to the IV curve scanning method, after IV scanning is carried out on a photovoltaic array of an optical storage system, if the operation parameters of an inverter meet a preset power limiting condition, an energy storage unit is controlled to be charged, photovoltaic power received by the inverter is reduced, and the inverter is prevented from entering a power limiting state,so that IV scanning of the optical storage system can be completely carried out, ie., complete scanning of IV curves under photovoltaic overconfiguration and a limited power mode can be realized.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to an IV curve scanning method and an optical storage system. Background technique [0002] When designing a photovoltaic inverter system, a photovoltaic configuration that matches the rated power of the inverter is usually adopted. figure 1 The dotted curve in is the power curve of conventional photovoltaic power generation; however, at present, the photovoltaic inverter system usually adopts the over-allocation technology when designing, that is, the configuration power P of the photovoltaic array and the rated power Pn of the AC output of the inverter in the system are set. The ratio is greater than 1, such as P:Pn=1.3:1, figure 1 The solid curve in is the photovoltaic power generation curve under over-provisioning, and the shaded part is the over-provisioning power of photovoltaics. [0003] Although the photovoltaic over-allocation can reduce the cost of electricity...

Claims

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Application Information

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IPC IPC(8): H02S50/10
CPCH02S50/10Y02E10/50
Inventor 杨宗军邹绍琨张彦虎张许成
Owner HEFEI SUNGROW RENEWABLE ENERGY SCI & TECH CO LTD
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