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Photovoltaic power generation system

A solar photovoltaic and power generation system technology, applied in photovoltaic power generation, photovoltaic system monitoring, photovoltaic modules, etc., can solve problems such as inability to obtain, delay in investment recovery, etc.

Inactive Publication Date: 2012-10-17
KK TOSHIBA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In addition, there is a problem that if an abnormal solar cell module is left alone, the expected amount of power generation cannot be obtained, resulting in a delay in return on investment

Method used

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  • Photovoltaic power generation system
  • Photovoltaic power generation system
  • Photovoltaic power generation system

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach ）

[0027] figure 1 It is a figure which shows the structure of the main part of the solar photovoltaic power generation system which concerns on 1st Embodiment. The solar photovoltaic power generation system includes a solar cell module, a connection box, an inverter, a step-up transformer, an AC circuit breaker, a combination transformer, and a combination circuit breaker. In addition, in figure 1 In , only the plurality of solar battery strings 8 and the connection box 2 are shown.

[0028] This solar photovoltaic power generation system is configured by connecting a plurality of solar battery strings 8 a to 8 d to a junction box 2 . Each of the solar cell strings 8 a to 8 d is constituted by one solar cell module 1 or by connecting a plurality of solar cell modules 1 in series.

[0029] The junction box 2 includes a switch F, a backflow prevention diode 13 , a positive electrode P, a negative electrode N, current detectors 10 a , 10 b , a measurement device 11 , and a data ...

no. 2 approach ）

[0045] image 3 It is a figure which shows the structure of the main part of the solar photovoltaic power generation system which concerns on 2nd Embodiment. exist image 3 In the solar photovoltaic power generation system according to the second embodiment shown, the respective current detectors 10 and 20 and the wirings 14 a to 14 d are housed in a case 17 . In addition, the solar cell string connection terminals 18 connected to the solar cell strings 8a to 8d, the connection box connection terminals 19 connected to the junction box 2, and the measurement device connection terminals 20 for transmitting data to the measurement device 11 are connected from the casing. 17 exposed.

[0046] According to the solar photovoltaic power generation system according to the second embodiment, although the weight increases, the attachment and detachment of the case 17 to the connection box 2 becomes simple, and the versatility can be improved. In addition, even when the number of sola...

no. 3 approach ）

[0048] Figure 4 It is a figure which shows the structure of the main part of the solar photovoltaic power generation system which concerns on 3rd Embodiment. exist Figure 4 In, about with figure 1 For the same structural part, description is omitted.

[0049] The current detector 10b turns, for example, the wires 14c2 and 14d2 multiple times (for example, twice) so that the currents of the solar cell strings 8a to 8d are reduced by Figure 5 The polarity of is positive and in Figure 5 The value (eg 2) times the number marked before the polarity is detected.

[0050] If the current detector 10b is configured in this way, the total current value will not become zero even if any two solar cell strings 8 include the solar cell modules 1a and 1b whose output has decreased. Therefore, it is possible to detect the solar cell string in which the output-decreased solar cell module exists even when the solar cell modules 1a and 1b with similarly decreased output exist in differe...

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Abstract

Provided with a plurality of solar cell strings (8) comprising solar cell modules (1) connected in a series that each generate direct-current power from light irradiation, and a junction box (2) that inputs the direct-current power from the plurality of solar cell strings. The junction box is equipped with: a plurality of current detectors (10) that each detect a combined current value for positive currents and negative currents when the currents running in a portion of the solar cell strings within the plurality of solar cell strings are positive and the currents running in the remaining solar cell strings in the plurality of solar cell strings, excluding said portion of solar cell strings, are negative; a measurement device (11) that measures, for each of the current detectors, the combined current value detected by the current detector; and a data transmission device (12) that transmits the current value measured by the measurement device.

Description

technical field [0001] The present invention relates to a solar photovoltaic power generation system that uses sunlight to generate power. Background technique [0002] In the solar photovoltaic power generation system, the inverter converts the DC power generated by the solar cell module irradiated by light into AC power and supplies it to the power system. The solar photovoltaic power generation system includes solar battery modules, connection boxes, inverters, step-up transformers, AC circuit breakers, combination (ie grid-connected) transformers and combination circuit breakers. [0003] The solar cell module generates DC power by being irradiated with light. A solar cell string is formed by connecting a plurality of solar cell modules in series. The solar battery string accumulates the DC power generated by each solar battery module and outputs it between the positive terminal and the negative terminal. The solar photovoltaic power generation system has a plurality ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L31/04H02J3/38
CPCH02J7/35H02J1/108H01L31/02021H04Q9/00Y02E10/566Y02E10/563H02J3/383Y02E10/50G01R31/405H04Q2209/886H04Q2209/845H02S50/00H02S50/10H02S40/34H02J2300/24H02J3/381Y02E10/56
Inventor 葛西智广筱原裕文
Owner KK TOSHIBA
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