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Flexible gathering topology, suitable for DC distribution network, of photovoltaic system and control method of topology

A photovoltaic system and flexible technology, applied in the field of solar photovoltaic power generation, can solve the problems of abandoned light, abandoned wind, and outstanding new energy consumption, and achieve the effect of improving efficiency, improving efficiency and improving system reliability.

Inactive Publication Date: 2018-10-23
XI AN JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the power market is oversupplied, especially in the western region, where the phenomenon of "abandoning wind and solar power" is more serious
Although the state encourages and guides photovoltaic and wind power to be connected to the grid preferentially from the policy level, due to the influence of factors such as power installed capacity, power grid peak-shaving capacity, and transmission channels, the problem of new energy consumption is prominent

Method used

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  • Flexible gathering topology, suitable for DC distribution network, of photovoltaic system and control method of topology
  • Flexible gathering topology, suitable for DC distribution network, of photovoltaic system and control method of topology
  • Flexible gathering topology, suitable for DC distribution network, of photovoltaic system and control method of topology

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Embodiment Construction

[0020] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0021] Such as figure 1 As shown, at the photovoltaic energy collection side, each photovoltaic array in each photovoltaic farm is respectively connected to an H-bridge module. The single-phase MMC device feeds the DC distribution network.

[0022] Specifically, the present invention includes several photovoltaic farms, and each photovoltaic farm includes several photovoltaic arrays, the output of each photovoltaic array is connected to the input end of an H-bridge module, and all H-bridges in a photovoltaic farm The output ends of the modules are connected in series to build an AC busbar connected to the midpoint of the bridge arm of the modular cascaded multilevel converter (MMC), and the output end of the modular cascaded multilevel converter is connected to the DC distribution network, namely: the module The AC side of the cascaded multil...

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Abstract

The invention discloses a flexible gathering topology, suitable for a DC distribution network, of a photovoltaic system and a control method of the topology. The flexible gathering topology comprisesphotovoltaic power generation fields, each photovoltaic power generation field comprises photovoltaic arrays, output of each photovoltaic array is connected with the input end of one H bridge module,the output ends of all H bridge modules in one photovoltaic power generation field are connected in series to an AC bus, the AC bus is connected to a bridge arm middle point of a modularized cascadedmulti-level converter (MMC), the output end of the MMC is connected to the DC distribution network, and the output ends of all photovoltaic power generation fields are connected in parallel. The large-scale or ultra-large-scale photovoltaic power generation field structure is analyzed and optimized from the aspect of the whole structure of the photovoltaic power generation field system and aimed at the developing trend towards DC of the distribution network, so that the total operation efficacy of the photovoltaic system is improved.

Description

technical field [0001] The invention belongs to the technical field of solar photovoltaic power generation, and in particular relates to a flexible collection topology of a photovoltaic system suitable for a DC distribution network and a control method thereof. Background technique [0002] With the rapid iteration of photovoltaic power generation scale and photovoltaic power generation technology, photovoltaic energy is no longer limited to supplementary energy, but is moving towards the direction of alternative energy. However, the power market is oversupplied, especially in the western region, where the phenomenon of "abandoning wind and solar power" is more serious. Although the state encourages and guides photovoltaic and wind power to be connected to the grid preferentially at the policy level, the problem of new energy consumption is prominent due to factors such as power installed capacity, power grid peak-shaving capacity, and transmission channels. [0003] At the...

Claims

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Application Information

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IPC IPC(8): H02J1/10H02M3/335
CPCH02J1/102H02M3/33569H02M1/007Y02E10/56
Inventor 王丰贺鑫露卓放易皓
Owner XI AN JIAOTONG UNIV
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