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High-power high-voltage photovoltaic direct-current boost converter apparatus and control method thereof

A DC step-up and high-power technology, which is applied to output power conversion devices, conversion of DC power input to DC power output, photovoltaic power generation, etc., can solve the difficulty of switching tube selection, complex structure and control, and difficulty in engineering realization and other problems, to achieve the effect of reducing the volume, reducing the effective value of the current, and reducing the design pressure

Active Publication Date: 2017-01-25
HEFEI UNIV OF TECH
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Problems solved by technology

[0007] 1): Small monomer capacity, low boost ratio, and low efficiency
[0008] 2): The cost is high, and it is difficult to select the switching tube under high voltage
[0009] 3): The structure and control are complex, and engineering realization is difficult

Method used

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  • High-power high-voltage photovoltaic direct-current boost converter apparatus and control method thereof
  • High-power high-voltage photovoltaic direct-current boost converter apparatus and control method thereof

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Embodiment Construction

[0033] The preferred modes of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0034] Depend on figure 1It can be seen that the high-power high-voltage photovoltaic DC boost converter device of the present invention includes: N-way photovoltaic power generation units and corresponding N-way boost conversion units, high-power three-phase square wave inverters, modular high-frequency three-phase booster Transformer unit and modular three-phase diode rectifier bridge unit. in:

[0035] The output terminal of each photovoltaic power generation unit is connected in series with the input terminal of one boost conversion unit, the output terminals of the N photovoltaic power generation units are connected in series with the input terminals of the corresponding N boost conversion units, and the output terminals of the N boost conversion units are connected to each other After parallel connection, it is connected in seri...

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Abstract

The invention provides a high-power high-voltage photovoltaic direct-current boost converter apparatus suitable for direct-current power transmission at photovoltaic power stations, and a control method thereof; the High-power high-voltage photovoltaic direct-current boost converter apparatus comprises N photovoltaic generating units and N boost conversion units corresponding to the photovoltaic generating units, a high-power three-phase square wave inverter, a modular high-frequency three-phase boost transformer unit and a modular three-phase diode rectifier bridge unit; the converter apparatus is modulated by using ring-opening square PAM (pulse amplitude modulation), and controlling pulse amplitude through the photovoltaic generating units and the boost conversion units is simple and efficient.

Description

technical field [0001] The invention relates to a power electronic device for direct current convergence of photovoltaic power generation equipment, in particular to a high-power high-voltage photovoltaic direct current step-up converter device and a control method. Background technique [0002] At the end of 2015, my country's photovoltaic installed capacity reached 43.18 million kilowatts, ranking first in the world, of which 75% were concentrated photovoltaics distributed in the "Three Norths" region. It is estimated that my country's total photovoltaic capacity will exceed 150 million kilowatts in 2020. Due to the constraints of solar energy and land resources, more than two-thirds of photovoltaics will be intensively developed and transported over long distances in the "Three Norths" region. During the "13th Five-Year Plan" period, the capacity of photovoltaic power stations will continue to develop in the direction of large-scale. The capacity of a single photovoltaic...

Claims

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Application Information

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IPC IPC(8): H02M3/335
CPCH02M3/335H02M1/0074H02M1/0077Y02E10/56
Inventor 张兴赵文广刘芳
Owner HEFEI UNIV OF TECH
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