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PV string optimizer system

An optimizer and inverter technology, applied in the parallel operation of current collectors, photovoltaic modules, DC power supplies, etc., can solve the problems of overcurrent protection of circuit breakers, fuses, arcing, etc.

Pending Publication Date: 2021-07-16
深圳市禾望科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the current-limiting characteristics of PV modules, it is impossible to use circuit breakers or fuses for over-current protection, and the entire circuit can only continue to generate short-circuit current until the short-circuit point heats up and causes arcing and fire

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] see image 3 , Figure 4 and Figure 5 , image 3 It is a circuit diagram of the connection between the PV string optimizer and the PV module string of the present invention, Figure 4 It is the circuit diagram of the PV string optimizer shown in the present invention, Figure 5 It is a circuit diagram of the PV string optimizer system shown in Embodiment 1 of the present invention; this embodiment discloses a PV string optimizer system, including N PV string optimizers, each PV string optimizer corresponds to a PV module string, each The PV module string is composed of at least two PV modules connected in series, and each of the PV string optimizer input terminals is independently connected to the corresponding PV module string output terminal to perform independent maximum power tracking, and each of the PV string optimizers includes The automatic breaking switch K1 with short-circuit fault disconnection protection function and the DC / DC converter arranged at the ...

Embodiment 2

[0036] see Image 6 , Image 6 It is a circuit diagram of a PV string optimizer and its photovoltaic system shown in Embodiment 2 of the present invention; this embodiment discloses a PV string optimizer system, N said PV string optimizers and corresponding N said PV module strings Composing unit one, the inverter in the PV string optimizer system also includes unit two, and the unit two includes input fuse one corresponding to each of the PV string optimizers, and a DC / AC conversion unit; the PV String optimizer one to the PV string optimizer N are connected to the corresponding input fuse one in the unit two through respective independent cables one to cable N.

[0037] In this embodiment, the PV string optimizer further includes a control unit that detects the voltage value at the input terminal of the PV string optimizer and judges whether a short circuit occurs at the rear end of the automatic breaking switch K1;

[0038] The control unit is connected with the automatic...

Embodiment 3

[0046] see Figure 7 , Figure 7 It is the PV string optimizer and its photovoltaic system shown in the third embodiment of the present invention.

[0047] This embodiment discloses a PV string optimizer system. On the basis of the PV string optimizer system in Embodiment 1, it also includes a unit three. The inverter in the PV string optimizer system also includes a unit two. The unit 2. Including input fuses corresponding to each of the PV string optimizers 1. DC / AC conversion unit; the PV string optimizer 1 to the PV string optimizer N are connected to the units through respective independent cables 1 to 1 The corresponding input fuse 1 in the second; all the input fuses inside the inverter form a unified DC busbar after output confluence, the unit 3 includes M independent PV module strings, and the unit 2 includes The input fuse 2 corresponding to the PV module string 1 to the PV module string M in the unit 3, and the DC / AC conversion unit; the PV module string 1 to the ...

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Abstract

The invention discloses a PV string optimizer system which comprises N PV string optimizers. Each PV string optimizer corresponds to a PV assembly string, and each PV assembly string is formed by connecting at least two PV assemblies in series. The input end of each PV string optimizer is independently connected with the output end of the corresponding PV assembly string for independent maximum power tracking. The PV string optimizers 1-N are connected to a DC / AC inverter through corresponding cables 1-N. The PV string optimizer system has the maximum power point tracking and short-circuit fault disconnection protection functions at the same time, each PV assembly string carries out independent MPPT tracking, and when any PV assembly string is short-circuited, the other PV assembly strings still work normally, the problem of parallel mismatch is avoided, and the situation that the whole loop continuously generates a short-circuit current under the condition that one PV assembly string has a short-circuit fault is avoided.

Description

technical field [0001] The invention relates to the technical field of photovoltaic power generation, in particular to a PV string optimizer system. Background technique [0002] In the existing PV power optimizer, one power optimizer is connected and installed for each PV module. The technical core of the power optimizer is to realize the maximum power point tracking of PV modules, and to cut off the circuit when there is a short circuit or other faults to prevent arcing and fire. However, as the cost of PV components decreases, the cost of power optimizers is relatively higher than that of PV components, resulting in too much increase in the cost of actual power plants, which cannot be used in large quantities. [0003] In the existing collection and distribution combiner box, multiple PV strings are combined first, and then multiple PV strings are used for maximum power point tracking. The distributed combiner box can solve the problem of parallel mismatch of multiple P...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02S40/30H02J3/38H02J1/10H02J7/35H02H7/20
CPCH02H7/20H02J1/10H02J3/381H02J7/35H02S40/30H02J2300/26Y02E10/56
Inventor 肖安波曾建友周党生盛小军
Owner 深圳市禾望科技有限公司
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