Communication-free working mode selection method applied to series photovoltaic power optimizers

A technology of power optimizer and working mode, applied in photovoltaic power generation, parallel operation of DC power supply, DC network circuit devices, etc., can solve the problems of increasing system control complexity, increasing cost, and high communication system requirements, reducing hardware costs and reducing hardware costs. Installation cost, effect of safe boot

Active Publication Date: 2021-10-08
ZHEJIANG UNIV
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Problems solved by technology

[0012] Traditional control methods require communication modules to ensure system startup, protection and stable operation, which will inevitably increase costs and increase the complexity of system control. is also very demanding

Method used

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  • Communication-free working mode selection method applied to series photovoltaic power optimizers
  • Communication-free working mode selection method applied to series photovoltaic power optimizers
  • Communication-free working mode selection method applied to series photovoltaic power optimizers

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specific Embodiment

[0049] In this embodiment, the structure of a tandem photovoltaic power optimizer system, such as figure 1 Indicated. The example consists of three photovoltaic modules, and the corresponding three photovoltaic power optimizer. Known voltage DC bus V bus , The DC bus may be a variety of ways (battery, DC-DC converter, photovoltaic inverter, etc.) are given;

[0050] Tandem photovoltaic power optimizer no communication mode selection method of the processes figure 2 Indicated. Power optimizer uses pre-Boost topology, previous stage to achieve the maximum power point tracking of the photovoltaic panels, and selection method to determine the current operation state according to the mode of the present invention. After setting the threshold number of starts n = 2, there are two or more photovoltaic module receives the light, the system can be started smoothly.

[0051] Intermediate DC bus voltage level is controlled by a battery, are:

[0052] V bus = V out1 + V out2 + V out3

[0053...

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Abstract

The invention relates to a distributed photovoltaic power generation technology, and aims to provide a communication-free working mode selection method applied to series photovoltaic power optimizers. The method comprises the steps that a power optimizer detects the output voltage of the power optimizer after being started, the power optimizer is turned on when the output voltage is lower than the lower limit of a hysteresis threshold, and the power optimizer is turned off when the output voltage is higher than the upper limit of the hysteresis threshold; after the illumination condition meets the threshold value of the starting number of the power optimizers, the whole series photovoltaic power optimizer system is started and transmits power to a backward stage; after the system is started, when the output voltage is higher than a shutdown threshold value, the power optimizer enters a standby state and waits for the change of an illumination condition; in the standby state, when it is detected that the output voltage is lower than a restart threshold value, the power optimizer is restarted. The power optimizers select the working modes according to the electrical parameters of the ports of the power optimizers, each power optimizer does not need a communication module, safe starting, operation, shutdown and restarting can be achieved, and the hardware cost and the installation cost are reduced.

Description

Technical field [0001] The present invention relates to the field of distributed photovoltaic power generation, and more particularly to an operation mode selection method applied to a series-type photovoltaic power optimizer. Background technique [0002] Solar safety, clean, efficient, sustainable, extensive distribution, and thus the development of photovoltaic industry is developing rapidly. The series power optimizer structure is one of a variety of photovoltaic power generation system, and the power optimizer controls the photovoltaic battery output voltage, achieving the maximum power point tracking (MPPT), and the output terminal constitutes a DC bus backward system. The series-type power optimizer structure can effectively solve the shadow occlusion, the unempline caused by the aging of components, has the characteristics of high modular, low cost, high flexibility. [0003] Each photovoltaic component in the series power optimizer system connects the corresponding power...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J1/10
CPCH02J1/102H02J2300/26Y02E10/56
Inventor 齐继志陈敏韩放郑睿瑞傅钰泰
Owner ZHEJIANG UNIV
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