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High-voltage suspended type photovoltaic grid-connected inverter system

An inverter and direct-mounted technology, which is applied in the field of high-voltage direct-mounted photovoltaic grid-connected inverter systems, can solve the problems of low energy conversion efficiency and large occupied space.

Inactive Publication Date: 2014-10-29
TBEA SUNOASIS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the whole system, the step-up transformer generally needs to be customized, and it is placed in a cabinet or house separately in the system, which takes up a lot of space
At the same time, only MPPT tracking is performed in the inverter, but each photovoltaic module does not perform individual MPPT tracking, so the efficiency of energy conversion in the existing technology is relatively low

Method used

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  • High-voltage suspended type photovoltaic grid-connected inverter system
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  • High-voltage suspended type photovoltaic grid-connected inverter system

Examples

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Embodiment 1

[0019] Such as figure 2 As shown, this embodiment is a high-voltage direct-mounted photovoltaic grid-connected inverter system. After multiple photovoltaic modules are connected to the confluence device, they are connected to the inverter, that is, the DC / AC unit to form multiple primary units. The multiple primary units The output of the units is then connected in series in sequence and directly connected to the grid for high-voltage power transmission; the number of the multiple photovoltaic modules must be such that the output voltage of the inverter, that is, the DC / AC unit, is 300VAC, and the number of the primary units in series must be Make the voltage after series connection reach the transmission voltage of the power grid 10KV or 35KV, which can save the step-up transformer at the power grid end in the system.

[0020] Such as image 3 As shown, in this embodiment, the inverter in a high-voltage direct-mounted photovoltaic grid-connected inverter system, that is, th...

Embodiment 2

[0027] Such as Figure 4 As shown, this embodiment is a high-voltage direct-mounted photovoltaic grid-connected inverter system. When the distance between the power station where the photovoltaic modules are located and the machine room where the inverter is located is greater than 80m, each photovoltaic module is first connected to the DC / DC booster The unit forms a first-level small unit. After multiple first-level small units are connected to the confluence device, they are connected to the inverter, that is, the DC / AC unit to form multiple second-level small units. The output of the multiple second-level small units is then After being connected in series, they are directly connected to the grid for high-voltage power transmission; the number of multiple photovoltaic modules and the number of first-level small units must make the output voltage of the confluence device 1500VDC, and the voltage of 1500VDC passes through the inverter, that is, DC / AC The voltage of 690VAC is ...

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Abstract

The invention discloses a high-voltage suspended type photovoltaic grid-connected inverter system; after being connected to a confluence device, a plurality of photovoltaic modules are connected to an inverter, namely a DC / AC unit, to form a plurality of primary units, and then the outputs of the plurality of primary units are directly connected to a power grid for performing high voltage transmission after being sequentially connected in series; the quantity of the plurality of photovoltaic modules should meet the requirement of enabling the output voltage of the inverter, namely the DC / AC unit to reach 300VAC; when a power station where the photovoltaic modules are located is far away from a machine room where the inverter is located, each photovoltaic module is firstly connected to a DC / DC boosting unit to from a primary small unit; after being connected to the confluence device, the plurality of primary small units are connected to the inverter, namely the DC / AC unit, to form a plurality of secondary small units; the outputs of the plurality of secondary small units are directly connected to the power grid for performing high voltage transmission after being sequentially connected in series; according to the high-voltage suspended type photovoltaic grid-connected inverter system each DC / AC unit has the function of maximum power tracing, thus being capable of improving power conversion efficiency of the whole power generation system; each DC / AC module is adjustable in power grade, and thereby power of the whole inverter can reach 500KW-1MW.

Description

technical field [0001] The invention relates to the technical field of photovoltaic grid-connected inverters, in particular to a high-voltage direct-mounted photovoltaic grid-connected inverter system. Background technique [0002] The output of the existing photovoltaic inverter is basically a low voltage 300VAC, which is then boosted to 10KV / 35KV by a transformer and then sent to the grid for high voltage transmission. Such as figure 1 As shown, most of the inverters are centralized, and each inverter has an independent MPPT. The module scale of a photovoltaic power generation system is 500KW, and they are connected together through series-parallel and confluence equipment. The inverter realizes MPPT and DC / AC The function of the transformer plays the role of isolation and boost. However, the step-up transformer in the entire system generally needs to be customized, and it is placed in a cabinet or house separately in the system, which takes up a lot of space. At the sa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02M7/5387H02M3/335
CPCY02E10/56
Inventor 张磊
Owner TBEA SUNOASIS
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