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Voltage stability evaluation method and device considering wind power output

A technology for voltage stability and wind power output, applied in the field of voltage stability evaluation considering wind power output, and can solve problems such as heavy computational burdens

Active Publication Date: 2020-07-28
GUANGDONG POWER GRID CO LTD +2
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Problems solved by technology

The actual power system contains large-scale random sources (including a large number of new energy sources, loads, etc.), and it is unnecessary to regard all random sources as input variables that have an important impact on the voltage stability of the power system, and it will bring a heavy computational burden

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  • Voltage stability evaluation method and device considering wind power output
  • Voltage stability evaluation method and device considering wind power output
  • Voltage stability evaluation method and device considering wind power output

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Embodiment Construction

[0059] This application combines the unscented transformation algorithm with the global sensitivity analysis, and uses the low-precision, high-efficiency hypersphere unscented transformation algorithm to conduct a rough probabilistic voltage stability analysis on the system, and based on the global sensitivity analysis method, it is identified that the calculation results of the voltage stability have The random variable with important influence, input the random variable with important influence into the high-precision symmetrical unscented transformation algorithm to obtain the analysis result of probabilistic static voltage stability. The algorithm of this application treats the random sources in the power system differently, and adaptively discovers the random sources with important influences in various operating scenarios of the power system, and regards them as the input variables of the probabilistic static voltage stability analysis, so as to improve the probabilistic s...

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Abstract

The embodiment of the invention discloses a voltage stability evaluation method and device considering wind power output. The method comprises the steps of obtaining historical data in a power system,and calculating the mean value and covariance of an input random variable in the historical data; inputting the random variable into a deterministic voltage stability evaluation model by adopting a hypersphere unscented transformation algorithm to obtain a covariance matrix of an input variable and an output response; inputting the covariance matrix into a global sensitivity algorithm model to obtain an important input variable influencing the voltage stability; and inputting important input variables influencing the voltage stability into the deterministic voltage stability analysis model byadopting a symmetric unscented transformation algorithm, and outputting a probability static voltage stability analysis result. According to the method, the unscented transformation algorithm and global sensitivity analysis are combined, so that the speed and precision of probability static stability analysis are improved.

Description

technical field [0001] The present application relates to the technical field of power quality assessment, and in particular to a voltage stability assessment method and device considering wind power output. Background technique [0002] Voltage stability is the basis for safe and stable operation of the power grid. Power system voltage stability analysis is mainly divided into transient voltage stability calculation and static voltage stability calculation. The static voltage stability calculation model has strong scalability and can be applied to a variety of operating scenarios. It is widely used in the stability analysis and verification of actual power systems. As more and more new energy sources with strong randomness are connected to the grid, there are more and more uncertain factors in the power system. However, deterministic static voltage stability analysis cannot consider the uncertainty of new energy output, and its calculation results cannot reflect the real ...

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Application Information

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IPC IPC(8): H02J3/12H02J3/46
CPCH02J3/12H02J3/46Y02E10/76
Inventor 彭穗余浩龚贤夫刘瑞宽
Owner GUANGDONG POWER GRID CO LTD
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