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Real-time modeling method for busbar load of doubly-fed wind generator access transformer substation

A technology for wind power generators and bus loads, applied in wind power generation, load forecasting in AC networks, and electrical components, etc., can solve problems such as aggravating the time-varying nature of generalized load nodes, failing to satisfy operation dispatchers, and affecting the safe operation of the power grid

Inactive Publication Date: 2020-12-04
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY +1
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AI Technical Summary

Problems solved by technology

Wind power output has random fluctuations and intermittent characteristics, while the load itself has time-varying properties. The interaction of the two aggravates the time-varying nature of generalized load nodes. For this, traditional load models and research methods will have an impact on the safe operation of the power grid , and cannot meet the needs of the operation scheduler

Method used

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  • Real-time modeling method for busbar load of doubly-fed wind generator access transformer substation
  • Real-time modeling method for busbar load of doubly-fed wind generator access transformer substation
  • Real-time modeling method for busbar load of doubly-fed wind generator access transformer substation

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Embodiment Construction

[0050] The present invention comprises the following steps:

[0051] (1) Obtain the historical data of the SCADA system and WAMS system of the load node, the data includes the amplitude and phase angle of the bus voltage, the amplitude and phase angle of the current, active power, reactive power and bus frequency f;

[0052] (2) Using the CEEMD-LSTM model to preprocess the daily load data of the SCADA system collected on multiple buses. Handle missing values ​​of load data on multiple buses.

[0053] Taking a piece of daily load data as an example, the preprocessing steps are as follows:

[0054] 1) Use the supplementary empirical mode decomposition algorithm (CEEMD algorithm) to decompose the bus load sequence x(t), and obtain n intrinsic mode function components IMF after decomposition 1 (t), IMF 2 (t), ..., IMF n (t) and a residual component r(t). Wherein, the n intrinsic mode function components and residual components are vectors with one row and m columns.

[0055]...

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Abstract

The invention discloses a real-time modeling method for a busbar load of a doubly-fed wind generator access transformer substation, and relates to the field of power systems. The method comprises thefollowing steps of: acquiring historical data of a busbar, and pre-processing daily load data of an SCADA system by adopting a CEEMD-LSTM model; clustering the SCADA system data by using an SCK-SHAPEmodel to obtain several types of busbar daily load typical curves; then respectively establishing load models of a static ZIP, an induction motor and a DFIG wind driven power generator; determining the load proportion of the model by introducing a wind power penetration rate and a dynamic and static load ratio; determining a composition structure of a load at a busbar node of a transformer substation by utilizing two operation states of the DFIG; and identifying busbar load parameters by using WAMS system data. The method can be applied to real-time load modeling and parameter identification of the power system, and a basis is provided for subsequent scheduling and control of the power system.

Description

technical field [0001] The invention relates to the field of electric power systems, in particular to a real-time modeling method for a doubly-fed wind power generator connected to a substation bus load. Background technique [0002] As one of the important components in the power system, the load has a great influence on the analysis and simulation calculation of the static, dynamic and transient characteristics and stability of the power system. However, the widely used load model is still relatively simplified and rough. The excessive roughness of the load model has become a key factor restricting the accuracy of power system analysis and simulation calculations. It is very important to establish a dynamic load model that is realistic and can accurately reflect the important characteristics of the actual situation. significance. [0003] In recent years, due to the increasingly prominent problems of energy shortage and environmental pollution, the development and utiliza...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00H02J3/38H02J3/46H02J3/14
CPCH02J3/38H02J3/003H02J3/144H02J3/466H02J2203/20H02J2300/28H02J2300/40Y02B70/3225Y02E10/76Y04S20/222
Inventor 马瑞燕彤彤蒋铁铮刘文飞智勇郝如海陈仕斌祁莹史玉杰
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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