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Dynamic reactive power reserve optimization method for improving transient voltage stability of AC and DC power grids

A technology for transient voltage stability and power grid transients, applied in the field of optimization, can solve problems such as the lack of dynamic reactive power backup of multi-infeed DC receiving end power grids

Active Publication Date: 2015-09-23
STATE GRID CORP OF CHINA +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In terms of backup, active power backup has always been the focus of attention, and research on reactive power backup is relatively rare, especially for dynamic reactive power backup with multi-infeed DC receiving end grids.

Method used

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  • Dynamic reactive power reserve optimization method for improving transient voltage stability of AC and DC power grids
  • Dynamic reactive power reserve optimization method for improving transient voltage stability of AC and DC power grids
  • Dynamic reactive power reserve optimization method for improving transient voltage stability of AC and DC power grids

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Embodiment

[0087] For the 3-machine 10-node system, the embodiment of the present invention changes the 5-circuit AC tie-line between busbars 5 and 6 into 2-circuit AC tie-line and 1-circuit bipolar DC transmission line, because the direction of the active power of the original AC line is Flows from node 5 to node 6, so let node 5 be the rectifier side and node 6 be the inverter side, such as image 3 shown. Due to the large reactive power absorbed by the DC system, SVCs with a capacity of ±180MVar and capacitor banks with a capacity of 1000MVar are respectively configured on node 6. Each capacitor bank has a capacity of 100MVar, and there are 10 groups in total. In addition, the unit, load and grid data of the original system remain unchanged. Thus, a modified test system for AC / DC hybrid transmission is formed.

[0088] Carry out a fault scan on this system to determine the critical fault set that threatens the voltage stability of the system. In order to illustrate the effectivenes...

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Abstract

The invention provides a dynamic reactive power reserve optimization method for improving transient voltage stability of an alternating-current and direct-current power grid. The method comprises the steps of determining a key fault set and a key node set which influence the transient voltage stability of a power system, and sequentially ranking nodes; adjusting reactive power output of dynamic reactive power compensation equipment and calculating the trajectory sensitivity of the dynamic reactive power compensation equipment; ranking m dynamic reactive power compensation equipment and calculating the weight coefficients of the nodes in the dynamic reactive power compensation equipment; calculating the capacities of the dynamic reactive power compensation equipment, establishing a dynamic reactive power reserve optimization model and solving the dynamic reactive power reserve optimization model. The dynamic reactive power reserve optimization method for improving the transient voltage stability of the alternating-current and direct-current power grid provides auxiliary decision-making support for improving the transient voltage stability of the multi-direct-current-drop-point power grid, and has great importance in improving the allowance of the transient voltage stability of the large-scale alternating-current and direct-current power grid, establishing a smooth power transmission passage between a transmitting end and a receiving end, improving the transmission capacity of the alternating-current and direct-current power transmission passage and improving the operation economy and the power quality of the power grid.

Description

technical field [0001] The invention relates to an optimization method, in particular to a dynamic reactive power backup optimization method for improving the transient voltage stability of an AC and DC power grid. Background technique [0002] DC transmission has the advantages of long-distance, large-capacity transmission, and flexible control and adjustment, so it is used for the interconnection of large-scale power grids and has become one of the main transmission channels for "West-to-East Power Transmission". With the orderly advancement of UHV power grid construction, by 2015, UHV and cross-regional and transnational power grid transmission capacity will be 261 million kilowatts, and UHV AC and DC will undertake more than 80% of the power transmission. Ultra-high voltage AC and DC have been greatly improved, which puts forward higher requirements on the ability of AC channels to withstand power flow transfer. The "Sanhua" receiving-end power grid will receive power f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/18H02J3/36
CPCY02E40/30Y02E60/60
Inventor 王琦张健李柏青邵瑶林伟芳刘丽平刘明松
Owner STATE GRID CORP OF CHINA
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