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Improved droop control method and device for direct-current system and storage medium

A technology of DC system and control method, applied in the field of microgrid

Pending Publication Date: 2021-03-12
兴储世纪科技股份有限公司
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Problems solved by technology

[0004] The present invention aims to provide an improved DC system droop control method, device and storage medium to solve the problem of inherent contradictions in traditional droop control in pursuit of smaller voltage deviation and higher shunt accuracy

Method used

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  • Improved droop control method and device for direct-current system and storage medium
  • Improved droop control method and device for direct-current system and storage medium
  • Improved droop control method and device for direct-current system and storage medium

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Embodiment

[0029] Such as figure 1 As shown, this embodiment proposes an improved DC system droop control method, and the DC system droop control method is a hybrid droop adjustment method using a moving droop curve method and a dynamically adjusting droop coefficient method;

[0030] The moving droop curve method is to translate the droop curve upward or downward according to the comparison result between the detected DC bus voltage and the expected value, or when a certain unit converter is required to increase or decrease the power output;

[0031] The method of dynamically adjusting the droop coefficient is to allocate power to each unit converter by dynamically adjusting the droop coefficient.

[0032] Specifically, the moving drooping curve method includes:

[0033] (1) When it is detected that the DC bus voltage is lower than the expected value, the drooping curve is shifted upward. That is, increase the DC bus voltage setting value U 0 , according to the principle of droop con...

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Abstract

The invention provides an improved droop control method and device for a direct-current system and a storage medium. The droop control method for the direct-current system is a mixed droop adjustmentmethod adopting a mobile droop curve method and a dynamic droop coefficient adjustment method. The mobile droop curve method is used for translating a droop curve upwards or downwards according to a comparison result of the detected DC bus voltage and an expected value or when the power output of a certain unit converter needs to be increased or decreased; and the dynamic droop coefficient adjustment method is used for carrying out power distribution on each unit converter by dynamically adjusting droop coefficients. According to the droop control method for the direct current system, the power output of each unit converter can be distributed in a balanced manner on the basis of the voltage deviation of the direct current bus through the hybrid adjustment method of combining the mobile droop curve method with the dynamic droop coefficient adjustment method.

Description

technical field [0001] The invention relates to the field of microgrids, in particular to an improved DC system droop control method, which is used for voltage stability control of DC microgrid systems. Background technique [0002] In response to the flexible characteristics of distributed energy generation and to solve the problem of reliable access, microgrids have been proposed as a solution. Microgrids can be implemented through the synergy and complementarity of multiple energy sources, effective management of loads, and support of energy storage equipment. Suppress power fluctuations in the system and reduce the impact of distributed energy and load random changes on grid stability. Introducing the micro-grid structure into the power system enables the effective use of distributed energy generation, so the micro-grid has become an important way to solve energy problems. Microgrids are mainly divided into two categories, namely AC microgrids and DC microgrids. The AC...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J1/00
CPCH02J1/00
Inventor 庞先标陈仁钊李二勇刘曙光张悦
Owner 兴储世纪科技股份有限公司
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