Inverter, inversion device, inversion system and switching method

An inverter system and inverter device technology, applied in the power supply field, can solve the problems affecting the reliability of the power generation system, large inrush current, etc., and achieve the effects of improving reliability and stability, avoiding inrush current, and non-impulse switching

Active Publication Date: 2017-05-31
BEIJING ETECHWIN ELECTRIC
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Problems solved by technology

[0004] Due to the change of load power or the control of the grid, redundant power supply usually involves dynamic switching of photovoltaic inverters. However, the inverter system and switching methods of the prior art will generate a large inrush current during switching. , in addition, a large circulating current is generated between the parallel inverters, which affects the reliability of the power generation system

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  • Inverter, inversion device, inversion system and switching method
  • Inverter, inversion device, inversion system and switching method
  • Inverter, inversion device, inversion system and switching method

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test approach 1

[0074] The embodiment of the present invention further utilizes the inverter system 30 and the switching method to perform the switching test.

[0075] The inverter system 30 includes two parallel-connected inverters 10 a and 10 b , and the structures of the two inverters 10 a and 10 b are the same as those of the inverter 10 . The inverter system 30 is put into the inverter 10b when the inverter 10a is operating normally. see Figure 7 , Figure 7 (a) is the three-phase current waveform during the normal operation of the inverter 10a, Figure 7 (b) is the current waveform when the inverter 10b using the switching method of the present invention is put into the inverter system 30 . It can be seen from the figure that the inrush current can be effectively avoided by using the inverter and the switching method of the present invention, and the circulating current between the inverters is very small. It can be seen from the figure that after the inverter 10b is put into , the...

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Abstract

The invention relates to an inverter, an inversion device, an inversion system and a switching method. The inverter comprises a three-phase inversion module and a switching control module. The three-phase inversion module is used for converting direct current into three-phase alternating current. The switching control module switches the three-phase inversion module phase by phase, so that impact current generated in switching of the inverter is avoided effectively, and impact-free switching is achieved.

Description

technical field [0001] The invention relates to the technical field of power supplies, in particular to an inverter for power supply, an inverter device, an inverter system and a switching method based on the inverter system. Background technique [0002] With the rapid development of photovoltaic power generation in recent years, the grid-connected operation of large photovoltaic power plants has become the mainstream of photovoltaic power generation development. [0003] With the increase of the proportion of photovoltaic power generation in the grid, the stable operation of the grid-connected photovoltaic power supply system has attracted more and more attention. The inverter system or device of large and medium-sized photovoltaic power plants is usually composed of multiple small photovoltaic inverters connected in parallel. On the one hand, the parallel connection of multiple photovoltaic inverters realizes power supply expansion and improves the flexibility of the powe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38
Inventor 赵帅央赵茵茵
Owner BEIJING ETECHWIN ELECTRIC
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