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Power support capacity distribution method of different DC lines in multi-DC system

A DC line and power support technology, applied in the direction of DC network circuit devices, circuit devices, electrical components, etc., can solve the problem of no priority calculation method

Active Publication Date: 2014-03-26
STATE GRID CORP OF CHINA +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this method, the priority of different DC lines is specified in advance, and there is no specific priority calculation method

Method used

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  • Power support capacity distribution method of different DC lines in multi-DC system
  • Power support capacity distribution method of different DC lines in multi-DC system
  • Power support capacity distribution method of different DC lines in multi-DC system

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Embodiment Construction

[0050] The present invention will be described in further detail below with reference to the accompanying drawings and examples.

[0051] figure 1 The step 1 described in is to calculate the contribution of different DC lines to improving the transient power angle stability, including the following steps.

[0052] Step 1-1: Identify the participation factors of the generator in the critical mode of transient power angle stability under a transient instability fault, that is, the transient power given by the extended equal area criterion (EEAC) according to the system time domain simulation trajectory Angular stability quantification information (generator grouping, margin, and swing times), based on the proportional relationship between the acceleration kinetic energy of each generator, identifies the participating factors of the generators in the critical mode of transient power angle stability.

[0053] Assuming that there are M units in the critical group after system inst...

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Abstract

The invention discloses a power support capacity distribution method of different DC lines in a multi-DC system, and belongs to the technical field of an electric power system and automation thereof. The method comprises: calculating the contribution of the different DC lines in improving transient power angle stability, the DC line maximum voltage controllable amount satisfying voltage safety constraints, and a support capacity integrated contribution index of each DC line, then determining a power support capacity distribution mode, and performing power support capacity distribution on each DC line. The method provided by the invention can be used for solving the problems of priority order determination and support capacity distribution of DC emergent power support of a multi-DC system, is helpful in fully utilizing the controllability characteristic of the DC system, improves transient stability of the system, prevents motor tripping or reduces motor tripping, and improves operation economic benefits and safety of an electric power system.

Description

technical field [0001] The invention belongs to the technical field of electric power systems and automation thereof. More precisely, the invention relates to a method for allocating power support amounts of different DC lines in a multi-DC system. Background technique [0002] Due to the geographical imbalance of my country's energy distribution and load development, the strategy implemented by my country's power grid is determined to be "power transmission from west to east, mutual supply between north and south, and national networking". Due to its advantages of economy, flexibility and controllability, DC transmission technology is playing an increasingly important role in long-distance power transmission and large-scale interconnected power grids. It is estimated that by 2020, more than 20 direct current transmission lines will be put into operation across the country. With the rapid development of the DC transmission system, the multi-DC interconnection of the power g...

Claims

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Application Information

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IPC IPC(8): H02J1/00
Inventor 宋晓芳方勇杰崔晓丹任先成杨卫东薛禹胜
Owner STATE GRID CORP OF CHINA
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