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Voltage droop control method of DC power grid

A technology of DC power grid and control method, which is applied in the direction of DC network circuit devices, electrical components, circuit devices, etc., and can solve problems such as the expression form of the droop function is not given

Active Publication Date: 2016-08-24
STATE GRID CORP OF CHINA +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, none of the above methods gives the expression form of the droop function

Method used

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  • Voltage droop control method of DC power grid
  • Voltage droop control method of DC power grid
  • Voltage droop control method of DC power grid

Examples

Experimental program
Comparison scheme
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Embodiment

[0056] An embodiment of the present invention provides a voltage droop control method for a DC power grid, the flow chart of which is shown in figure 1 shown, including the following steps:

[0057] Step 1: DC power grid topology transformation, the flow chart is as follows figure 2 Shown:

[0058] The basic structure of the DC power grid has two types of ring-network connection and radial connection. The current interaction in the ring-network connection is strong, and its control and protection are relatively complicated, while the current in the radial connection is relatively independent, which is conducive to the realization of the DC network. power balance control, so the purpose of topology conversion is to Figure 4 The DC network of any structure shown in the figure is transformed into Figure 5 A simple topology with only radial links is shown.

[0059] 1) Write the system admittance matrix Y and relationship matrix A according to the grid parameters;

[0060] ...

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PUM

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Abstract

The invention relates to a voltage droop control method of a DC power grid. The voltage droop control method comprises the steps of: starting with a grid frame structure of the DC power grid, defining a relationship between voltage and current of a convertor station in the DC power grid, transforming typology of the DC power grid, and changing the DC power grid of an arbitrary structure into the one of only a topological structure in radial connection; analyzing flow distribution of the DC power grid, and calculating power variations of subcircuits when voltage of a system fluctuates; and constructing a convertor station voltage droop function according to power variations of the system, so that power of the subcircuits remains unchanged when the voltage of the system fluctuates, thereby achieving the effect of reducing system voltage fluctuations. The voltage droop control method of the DC power grid provided by the invention can stabilize the system voltage quickly, distribute system flow reasonably, and reduce insulating requirement of the system.

Description

technical field [0001] The invention relates to a control method of a direct current transmission system, in particular to a voltage droop control method of a direct current power grid. Background technique [0002] The DC grid developed based on the flexible DC transmission technology is an energy transmission system composed of a large number of converter stations interconnected. The technical report of the Working Group B4.52 of the International Conference on Large Power Grids (CIGRE) defines the DC grid as: DC grid It is a DC network composed of multiple meshed and radially connected converters, that is, it is characterized by mesh and redundancy. [0003] Due to flexible power transmission and strong reliability, DC grid technology is considered to be the most effective technical solution in terms of large-scale distributed renewable energy access, power supply in oceanic islands, transmission from offshore wind farm clusters, and construction of new urban power grids....

Claims

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Application Information

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IPC IPC(8): H02J1/00
Inventor 贺之渊杨越汤广福庞辉安婷孔明
Owner STATE GRID CORP OF CHINA
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