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A Quantitative Evaluation Method for Power Grid Transient Voltage Stability

A quantitative evaluation and grid voltage technology, applied in the direction of electrical components, circuit devices, AC network circuits, etc., can solve the problems of ineffective evaluation and control of transient voltage effects, single factors, etc.

Active Publication Date: 2021-01-01
STATE GRID CORP OF CHINA +3
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  • Abstract
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Problems solved by technology

However, the factors they consider are single, and most of them are 0 / 1 quantities, which cannot effectively evaluate the influence of control on transient voltage stability

Method used

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  • A Quantitative Evaluation Method for Power Grid Transient Voltage Stability
  • A Quantitative Evaluation Method for Power Grid Transient Voltage Stability
  • A Quantitative Evaluation Method for Power Grid Transient Voltage Stability

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Embodiment Construction

[0067] The present invention proposes a power grid transient voltage stability quantitative evaluation method, and the present invention will be further described in detail below in combination with specific embodiments.

[0068] The present invention proposes a quantitative evaluation method for power grid transient voltage stability, which includes the following steps:

[0069] (1) Calculating the low voltage recovery component of the grid voltage trajectory, the specific steps are as follows:

[0070] (1-1) Calculating the low voltage recovery component of the bus voltage trajectory under stable conditions, the expression is as follows:

[0071]

[0072] T TVSIr =min(S T )

[0073] S T ={t|v(t)=V S}

[0074] V S =v(T S )

[0075]

[0076] Among them, TVSI r is the low voltage recovery component of the bus voltage trajectory of the transient voltage stability quantitative evaluation index; T TVSIr is the moment when the bus voltage returns to the stable volt...

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Abstract

The invention provides a power grid transient voltage stability quantitative evaluation method, and belongs to the field of power system safety analysis. The method is characterized by, to begin with,calculating a power grid voltage track low-voltage recovery component, a power grid voltage track oscillation degree characteristic component and a power grid voltage track recovery steady-state component respectively; and endowing the three components with weights, and then, performing weighted summation on the three components to obtain an evaluation result of the transient voltage safety of the power grid. The method extracts the characteristics of the voltage track from three aspects, and provides a three-dimensional quantitative index based on the voltage track, wherein the value of theindex is continuous and quantitative, thereby realizing quantitative expression of the voltage track; and factors influencing the transient power grid stability of the power grid are reflected from multiple aspects, and guidance is provided for improving the transient power grid stability of the power grid.

Description

technical field [0001] The invention belongs to the field of power system safety analysis, in particular to the field of quantitative evaluation of power grid transient voltage stability. Background technique [0002] With the commissioning of many large-capacity long-distance power transmission projects in my country, multiple large-scale sending-end power grids and receiving-end power grids have been formed. In the DC multi-drop receiving end power grid, the transient voltage stability is weak and the dynamic reactive power reserve is scarce. Therefore, it is necessary to evaluate the margin and demand of reactive power reserve in order to improve the transient voltage security of the power grid. [0003] For large-scale power grids, transient voltage safety analysis can almost only rely on time-domain simulation methods. This method can only obtain the simulated voltage trajectory, and additional criteria / indicators are needed to evaluate the transient voltage safety of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/00
CPCH02J3/00
Inventor 王卫葛怀畅董晋阳张志坚董楠王彬王腾飞赵文禄宋方方汤磊黄立华齐子杰
Owner STATE GRID CORP OF CHINA
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