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Improved droop control method and device with bus voltage recovery

A technology of bus voltage and control method, applied in parallel operation of DC power supply, load balancing in DC network, etc., can solve the problems of confrontational contradiction, can not be ignored, large resistance value of transmission line, etc., achieves low communication requirements, and is convenient for expansion. , the effect of improving reliability

Inactive Publication Date: 2019-10-11
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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Problems solved by technology

[0004] However, as the scale of the DC microgrid gradually increases, the resistance value of the transmission line is also increasing, which cannot be ignored. In the DC microgrid, there is an antagonistic contradiction between bus voltage recovery and accurate load distribution in traditional droop control. Can think of a compromise between the two

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  • Improved droop control method and device with bus voltage recovery
  • Improved droop control method and device with bus voltage recovery
  • Improved droop control method and device with bus voltage recovery

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Embodiment Construction

[0040] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is carried out on the premise of the technical solution of the present invention, and detailed implementation and specific operation process are given, but the protection scope of the present invention is not limited to the following embodiments.

[0041] An improved droop control method with bus voltage restoration. Based on the analysis of the typical structure of DC microgrid and the limitations of traditional droop control, a controllable droop characteristic based load distribution and bus voltage without deviation is proposed. Control Method. First of all, accurate line resistance information is obtained through active measurement methods, and it is introduced into the droop control to correct the droop coefficient and compensate for the influence of line resistance on current distribution. Secondly, the bus voltage infor...

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Abstract

The invention relates to an improved droop control method and device with bus voltage recovery. The method comprises the steps of (S1) measuring resistance information and correcting a droop coefficient on the basis of measured resistance information; (S2) collecting bus voltage of a common coupling point and obtaining voltage deviation correction amount; and (S3) controlling output voltage of a converter on the basis of the corrected droop coefficient and the obtained voltage deviation correction amount. Compared with the prior art, the improved droop control method and device have the advantages that the operation characteristics of a DC microgrid are fully utilized, the actively measured resistance is utilized and a voltage recovery unit is introduced, so that the disadvantages of traditional droop control are overcome.

Description

technical field [0001] The invention relates to a droop control technology, in particular to an improved droop control method and device with bus voltage restoration. Background technique [0002] Microgrid is a small power generation and distribution system that integrates distributed generation (Distributed Generation, DG), energy storage system (Energy Storage System, ESS) and multiple types of loads, and uses power electronic converters for energy control and distribution. Grid-connected and islanded operation modes. With the micro-grid self-management function, it can alleviate the adverse effects of intermittent distributed power grid connection, improve power quality and power supply reliability. Connecting distributed power to the distribution network in the form of a microgrid is generally considered to be one of the most effective ways to utilize distributed power. Compared with the traditional AC microgrid, the DC microgrid does not have problems such as reactiv...

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Application Information

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IPC IPC(8): H02J1/10H02J1/14
CPCH02J1/10H02J1/14
Inventor 赵晋斌蒋伟明刘海风高明明毛玲
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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