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Parallel operation control method for power converters in direct-current micro-grid

A power converter and DC micro-grid technology, applied in the direction of parallel operation of DC power supplies, can solve problems such as complex and diverse external environmental conditions, and achieve the effects of maintaining voltage, strong anti-interference ability of the system, and easy operation

Inactive Publication Date: 2016-05-11
青岛微电网能源装备科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the actual operation of the DC microgrid, the external environmental conditions are complex and diverse, so it is more practical to study the stable operation of the DC microgrid under the above complex operating conditions

Method used

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  • Parallel operation control method for power converters in direct-current micro-grid
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  • Parallel operation control method for power converters in direct-current micro-grid

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Embodiment Construction

[0039] The present invention will be further limited below in conjunction with the accompanying drawings and specific embodiments, but not limited thereto.

[0040] figure 1 Shown is a schematic diagram of the structure of the DC microgrid system. The DC microgrid includes a DC micro-source 1, a DC micro-source 2, a power converter 1, a power converter 2, a connecting line 1, a connecting line 2, a DC bus, a DC load, a charging and discharging switch, an energy storage unit, and a controller 1. Controller 2, energy storage unit controller; the DC electric energy output by the DC micro-source 1 and the DC micro-source 2 are respectively subjected to power conversion through the power converter 1 and the power converter 2, and the output of the two power converters and then transmitted to the DC bus through the connecting line 1 and connecting line 2 to supply power for the DC load, and the energy storage unit is connected to the DC bus through the charging and discharging swit...

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Abstract

The invention discloses a parallel operation control method for power converters in a direct-current micro-grid. In the event that rated capacities of the power converters are not same and connection line resistances are not same, respective output powers still can be precisely distributed; therefore, the application range is enlarged; the anti-interference capability of a system is relatively high; the system still can work stably in the event of having relatively high communication delay; energy is mutually transferred between an energy storage unit and a direct-current bus by turning on and turning off a charging and discharging switch, such that steady voltage of the direct-current bus is kept; and the parallel operation control method is simple in principle and easy to operate.

Description

technical field [0001] The invention relates to a method for controlling parallel operation of DC micro-grid power converters, and belongs to the technical fields of distributed power generation and smart grids. Background technique [0002] In order to solve the technical problems of connecting distributed power sources to the power grid, scholars related to power systems have proposed the concept of micro-grids. The microgrid is composed of distributed micro-sources, energy conversion devices and local loads interconnected through the network. It is a local power generation system that can realize self-control, protection and management. [0003] Microgrids are divided into AC microgrids and DC microgrids. A DC microgrid can not only easily connect to DC micro-sources, such as photovoltaic arrays, fuel cells, and supercapacitors, but also increase line transmission capacity, improve power supply reliability, and reduce system losses. At present, DC loads are increasing, ...

Claims

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Application Information

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IPC IPC(8): H02J1/10
CPCH02J1/10
Inventor 张庆海
Owner 青岛微电网能源装备科技有限公司
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