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An adaptive multi-slope droop control system and method for DC microgrid

A technology of DC micro-grid and control system, which is applied in the direction of load balance in DC network, parallel operation of DC power supply, sustainable manufacturing/processing, etc., and can solve the problem of complex droop control process, inflexibility, and system operation reliability to be enhanced, etc. problems, to achieve optimal configuration and design, and reduce stress

Active Publication Date: 2019-08-09
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the entire droop control process of this application is complex and not flexible enough, and the operational reliability of the system needs to be enhanced

Method used

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  • An adaptive multi-slope droop control system and method for DC microgrid
  • An adaptive multi-slope droop control system and method for DC microgrid
  • An adaptive multi-slope droop control system and method for DC microgrid

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Embodiment 1

[0051] The self-adaptive multi-slope droop control method for DC microgrid in this embodiment aims at the problem of contradiction between system current sharing and bus voltage deviation in the parallel operation of distributed micro-sources in DC microgrid, and performs partition control on loads, only Primary control is required to improve current sharing performance and improve bus voltage deviation. The DC microgrid multi-slope droop control method based on load partition configuration divides the load current into three areas according to the weight of the load: light load area, rated load area and heavy load area, and then implements Multi Slope Droop Control (MSDC), configure the corresponding droop coefficient, so as to focus on improving the system current sharing performance and bus voltage deviation in the rated load area and heavy load area through multi-slope droop control. The output characteristic curve of the MSDC control converter is different from the tradit...

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Abstract

The invention discloses an adaptive multi slope droop control system and an adaptive multi-slope droop control method for a direct current microgrid. Aiming at the problem that in the direct current microgrid, the system average current is contradictory with busbar voltage deviation in distributed microsource parallel operation, a load current is divided into three areas including a light load area, a rate load area and a heavy load area, and then multi slope droop control (MSDC) is implemented for the different load areas, to focus on improvement of system average current performance and busbar voltage deviation of the rate load area and the heavy load area. An MSDC converter output characteristic curve is different from a traditional constant droop output characteristic, the light load area, the rate load area and the heavy load area in the load area can be flexibly distributed according to system requirements on average current error and busbar voltage deviation, and an adaptive adjustment capacity to the load is provided, so that optimal configuration and design for the droop characteristic within a relatively wide load range can be achieved.

Description

technical field [0001] The invention relates to the technical field of power output balance of micro-source converters in a DC micro-grid and improved system bus voltage adjustment rate design, in particular to a system current sharing and bus voltage deviation control method when multiple power converters operate in parallel. Background technique [0002] With the development of new energy and people's increasing awareness of energy conservation and emission reduction, power system energy is moving towards green and sustainable development. In order to realize the coordinated operation of distributed energy sources, microgrid provides a feasible form of integrated utilization for distributed energy sources. In the DC microgrid system, it is not necessary to consider the influence of reactive power and frequency, which improves the efficiency and power supply quality of the system. Its main control goal is to obtain a lower bus voltage adjustment rate and power sharing of ea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J1/10H02J1/14
CPCY02P80/14
Inventor 刘宿城李中鹏刘晓东方炜
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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