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Dynamic reactive power reserve optimization method for improving medium and long-term voltage stability of AC and DC power grids

A technology of voltage stabilization and optimization method, applied in the direction of AC network voltage adjustment, DC network circuit device, reactive power compensation, etc., can solve problems such as difficulty in detection and loss

Active Publication Date: 2017-01-11
STATE GRID CORP OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the concealment and suddenness of the voltage stability problem, it is difficult to detect it during the accident. Once a voltage collapse occurs, it will inevitably cause extremely huge losses in the actual situation of my country's current power grid.

Method used

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  • Dynamic reactive power reserve optimization method for improving medium and long-term voltage stability of AC and DC power grids
  • Dynamic reactive power reserve optimization method for improving medium and long-term voltage stability of AC and DC power grids
  • Dynamic reactive power reserve optimization method for improving medium and long-term voltage stability of AC and DC power grids

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Embodiment

[0145] like image 3 As shown, for the 3-machine 10-node system, the 500kV bus (Bus6) supplies power to two loads in the load area, and the industrial load (node ​​Bus7) is connected to the 500kV load bus through an OLTC transformer, while the residential load and the commercial load (node ​​Bus10 ) is connected to the 500kV load bus through two OLTC transformers and a section of impedance representing the secondary transmission system. There is a 1600MVA equivalent generator (node ​​Bus3) in the load area, and a large number of parallel compensation devices are used. Node 8 is equipped with a static var compensator (SVC) with a capacity of ±240Mvar and a capacitor bank with a capacity of 600Mvar. , each group of capacitors has a capacity of 100Mvar, a total of 6 groups. Two remote generators transmit power to the load area through four 500kV lines and one bipolar DC transmission line. The main model used in the simulation: transformers (Bus9~Bus10) are OLTC transformers, an...

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Abstract

The invention provides a dynamic reactive reserved optimizing method for improving the long-term voltage stabilization in an AC / DC (Alternating Current / Direct Current) power grid. The method comprises the steps below: determining a key failure integration for affecting the long-term voltage stabilization in the AC / DC power grid; adjusting reactive power output of dynamic reactive compensation equipment, and calculating the flexibility of the dynamic reactive compensation equipment; ordering m dynamic reactive compensation equipments, and calculating the weighting coefficients of the dynamic reactive compensation equipments; calculating the reserved capacity of the dynamic reactive compensation equipments, and building and resolving a dynamic reactive reserved optimization model. According to the method provided by the invention, the auxiliary decision support can be provided to improve the long-term voltage stabilization level in a multi DC droppoint power grid; furthermore, the dynamic reactive reserved optimizing method has significance on the improvement on the long-term voltage stabilization allowance in the AC / DC power grid, the construction of the smooth power transmission channels between a transmission end and a receiving end, the improvement on the delivery capacity of a DC power transmission channel, and the improvement on the economy and power quality of the operation of the power grid.

Description

technical field [0001] The invention belongs to the technical field of electric power systems, and in particular relates to a dynamic reactive power reserve optimization method for improving medium- and long-term voltage stability of AC and DC power grids. Background technique [0002] Since the problem of voltage stability has been valued by scholars at home and abroad, it has developed into multiple research branches, and there is a clear and reasonable definition of voltage stability. After years of research efforts, electric power scholars have achieved fruitful results in some fields of voltage stability. Achievements, such as static voltage stability analysis, small disturbance voltage stability in dynamic voltage stability, and transient voltage stability analysis, have formed a relatively complete set of research theories and analysis methods, which can be used in power system dispatching operation and monitoring control. play an irreplaceable role. However, at pres...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/16H02J1/00G06Q10/04G06Q50/06
CPCG06Q10/04G06Q50/06H02J1/00H02J3/16Y02E40/30
Inventor 王琦张健刘丽平刘明松林伟芳
Owner STATE GRID CORP OF CHINA
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