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Method for determining minimum power-on mode based on regional voltage stabilization

A start-up mode and voltage stabilization technology, applied in the field of receiving power grid, can solve problems such as voltage instability, and achieve the effects of improving voltage support capability, fast calculation, and simple process

Active Publication Date: 2017-08-18
ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY +1
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

The above two analysis methods have been widely used respectively, but there is still no effective method to combine the two evaluation methods to guide the arrangement of the actual power grid operation mode and avoid regional voltage instability under severe faults

Method used

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  • Method for determining minimum power-on mode based on regional voltage stabilization
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  • Method for determining minimum power-on mode based on regional voltage stabilization

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Embodiment Construction

[0022] With the continuous construction of UHV transmission projects, the operating characteristics of AC / DC hybrid power grids are becoming more and more complex. After the DC large-capacity feed-in outside the area, the start-up scale of the receiving-end power grid gradually decreases, and the voltage support characteristics continue to weaken. In this case, a large number of local units were replaced by incoming electricity from outside the area, resulting in a decrease in the static voltage stability margin, a weakened transient voltage recovery capability under fault conditions, and the possibility of voltage collapse in extreme cases.

[0023] Based on the above reasons, the present invention provides a minimum start-up calculation method based on regional voltage stability. The overall flow chart is as follows figure 1 shown. Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0024] Step 1:...

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Abstract

The invention discloses a method for determining a minimum power-on mode based on regional voltage stabilization. A conventional power grid stability analysis method is used to guide the arrangement of an actual power grid operation mode and still has regional voltage instability under serious failure. The method is characterized by stably calculating static voltage and transient voltage based on actual power grid operation mode data; when a static or transient voltage stability requirement is not satisfied, outputting the weakest voltage stability point of the whole grid, and starting a power generator closest to the weakest point in electrical distance until both static and transient voltage stability requirements are satisfied simultaneously in order to avoid voltage collapse in a local area of the power grid under the serious failure. The method can be used to arrange the actual power grid operation mode and improves the safety and stability level of the power grid.

Description

technical field [0001] The invention relates to the field of power system voltage security and stability, in particular to a method for determining a minimum start-up mode based on regional voltage stability, which is suitable for receiving-end power grids with potential voltage safety hazards. Background technique [0002] The voltage stability of power system has long been a hot topic of concern to power workers and scholars, and it is also an important reason for many blackouts at home and abroad. Under the multi-DC feed-in, the "strong DC and weak AC" characteristics of the receiving end power grid are further manifested, and the problem of "large power receiving, small power-on" operation mode is prominent, and the operating characteristics of the power grid have undergone important changes, threatening the safety and stability of the power system voltage. Document 1 "Characteristic Analysis and Operation Control of Large-Scale UHV AC-DC Hybrid Power Grid" (Power Grid T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/12H02J3/46
CPCH02J3/12H02J3/46
Inventor 邓晖黄晓明楼伯良孙维真叶琳华文黄弘扬赵一琰卢岑岑王龙飞杨滢张静周正阳
Owner ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY
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