Intelligent solar photovoltaic module circuit and control/protection method thereof

A technology of solar photovoltaic and photovoltaic modules, applied in photovoltaic power generation, control/regulation systems, circuits, etc., can solve the problems of solar photovoltaic modules without power output, affecting group string output, group string disconnection, etc., to achieve simplified MPPT structure, The effect of reducing costs and improving efficiency

Inactive Publication Date: 2015-05-27
SUZHOU TALESUN SOLAR TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this scheme, when a single solar photovoltaic module is disconnected, the entire string will be disconnected, affecting the output of the entire string, such as image 3 : Assuming that due to a fault, it is necessary to image 3 The middle solar PV module is isolated from the group string, by controlling the action of T3 and T4 switches, the output of the middle solar photovoltaic module is in the disconnected state, and this method is used to isolate the middle solar photovoltaic module from the group string, as shown in the figure, the switch in the red circle is disconnected , then there is no current in the entire circuit, resulting in no power output in the entire string of solar photovoltaic modules

Method used

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  • Intelligent solar photovoltaic module circuit and control/protection method thereof
  • Intelligent solar photovoltaic module circuit and control/protection method thereof
  • Intelligent solar photovoltaic module circuit and control/protection method thereof

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Embodiment 1

[0022] Such as Figure 4 As shown, since solar photovoltaic modules are nonlinear components, their IV characteristics are not like those of general power supplies. The IV curve of a solar photovoltaic module can be approximately regarded as composed of a part perpendicular to the vertical axis (current axis) and a part perpendicular to the horizontal axis (voltage axis). When the operating point of the load is on the former, the solar photovoltaic module can be approximated as As a current source; when the operating point of the load is on the latter, the solar photovoltaic module can be approximately regarded as a voltage source, so it can be said that the solar photovoltaic module has both the characteristics of a current source and the characteristics of a voltage source. That is, the solar photovoltaic module can work as a short circuit like a current source. Utilize this characteristic, design the circuit of intelligent solar photovoltaic module, will figure 2 The Zho...

Embodiment 2

[0025] Such as Figure 7 As shown, in this embodiment, the smart solar photovoltaic module circuit includes multiple sets of photovoltaic strings connected in series, and each group of photovoltaic strings includes smart photovoltaic module units, MPPT functional modules connected in series with smart photovoltaic module units, and smart solar photovoltaic modules. The assembly circuit also includes a CPU memory module for receiving and analyzing the state of the smart photovoltaic assembly unit, a control module electrically connected to the CPU memory module and used for controlling the MPPT function, and each of the photovoltaic strings is also A switch tube is connected to short-circuit the smart photovoltaic module unit or disconnect the photovoltaic string from other photovoltaic strings, and the switch tube is controlled by the control module. Each of the MPPT functional modules includes an adjustment switch for adjusting the duty cycle whose negative pole is connected ...

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Abstract

The invention relates to an intelligent solar photovoltaic module circuit and a control / protection method thereof. The circuit comprises multiple groups of photovoltaic strings in series connection, wherein each photovoltaic string comprises an intelligent photovoltaic assembly unit, an MPPT (maximum power point tracking) function module, a switch tube, a CPU (central processing unit) internal storage module and a control module, wherein the switch tube enables the photovoltaic assembly unit to be short-circuited or enables the photovoltaic assembly string to be disconnected with other photovoltaic assembly stings, and the switch tube is controlled by the control module. The intelligent solar photovoltaic module circuit and the control / protection method thereof have the advantages as follows: 1, the MPPT structure can be simplified, electric and electronic elements are reduced, the efficiency is improved, and the cost is reduced; 2, even if a single solar photovoltaic assembly is disconnected as a result of a fault, the output of the whole string cannot be influenced, and the photoelectricity utilization rate is substantially improved.

Description

technical field [0001] The invention relates to the field of photovoltaic equipment, in particular to a control / protection method for an intelligent solar photovoltaic component circuit. Background technique [0002] Generally, in a photovoltaic power station, in order to solve the mismatch problem, there is an MPPT conversion circuit on the DC side of the grid-connected inverter, including the traditional centralized grid-connected photovoltaic inverter and the string-type grid-connected photovoltaic inverter. . [0003] In recent years, in order to solve the problem of mismatch between single solar photovoltaic modules, new AC modules and smart modules have appeared. Compared with traditional solar photovoltaic modules, the main structure is as follows: figure 1 . [0004] Among them, the AC component uses more electronic components due to its complicated circuit structure, and the cost is relatively high. Generally, intelligent components can be used to achieve mismatc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/10
CPCH02M3/1584H02M1/0077H02J3/381H02J2300/26H02S50/00H02S40/36G05F1/67H02J2300/24Y02E10/56H02H3/087H01L31/02021H01L31/05
Inventor 倪志春胡雷振许明江许志祥
Owner SUZHOU TALESUN SOLAR TECH CO LTD
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