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Direct current power grid voltage optimization control method for multi-end-comprising photovoltaic power generation system

A photovoltaic power generation system, voltage optimization technology, applied in the direction of photovoltaic power generation, power transmission AC network, electrical components, etc., can solve problems such as DC voltage deviation, failure to maintain rated value, impact on DC grid system operation, etc.

Inactive Publication Date: 2017-08-29
STATE GRID CORP OF CHINA +3
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

This control method does not require communication and has higher reliability. However, there is also the problem that after power adjustment, the DC voltage deviates and cannot be maintained at the rated value, which has a certain impact on the operation of each end of the DC grid system.

Method used

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  • Direct current power grid voltage optimization control method for multi-end-comprising photovoltaic power generation system
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  • Direct current power grid voltage optimization control method for multi-end-comprising photovoltaic power generation system

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Embodiment Construction

[0026] The technical solutions in the embodiments of the present invention are clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0027] In the following description, a lot of specific details are set forth in order to fully understand the present invention, but the present invention can also be implemented in other ways different from those described here, and those skilled in the art can do it without departing from the meaning of the present invention. By analogy, the present invention is therefore not limited to the specific examples disclosed below.

[0028] Such as Figure...

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Abstract

The invention discloses a direct current power grid voltage optimization control method for multi-end-comprising photovoltaic power generation system, and relates to the technical field of a control method for the direct current power grid voltage of a photovoltaic power generation system. The method comprises the following steps of starting voltage optimization control when the direct current power grid generates voltage deviation through droop control, changing intercept of a direct current voltage-active power droop characteristic curve of a networking current converter G-VSC, enabling the G-VSC to perform charging-discharging to a direct current network side capacitor through additionally issuing or absorbing power, and enabling the direct current voltage to be recovered and maintained at a rated value. By virtue of voltage optimization control in the method, the voltage which deviates due to droop control can return to the rated value, so that the purpose of direct current voltage no-deviation regulation can be achieved, and the operation of the photovoltaic power generation system can be more stable.

Description

technical field [0001] The invention relates to the technical field of a method for controlling DC grid voltage of a photovoltaic power generation system, in particular to a DC grid voltage optimization control method including a multi-terminal photovoltaic power generation system. Background technique [0002] With the depletion of fossil energy and the increasing environmental pressure, my country and the world urgently need a strategic adjustment of the energy structure. New energy such as wind energy and light energy will account for an increasing proportion of the energy structure. . In terms of new energy access, compared with the traditional AC grid, the DC grid has the characteristics of simple structure, good controllability, large transmission capacity and low line cost, and has more technical and economic advantages. Therefore, the DC grid will become The trend of future grid development. [0003] In a DC grid, the DC voltage is the only indicator that reflects t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/36H02J3/38
CPCH02J3/36H02J3/383Y02E10/56Y02E60/60
Inventor 李春来王东方张海宁杨立滨贾昆张节潭杨军李正曦孟建辉王琛王慧
Owner STATE GRID CORP OF CHINA
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