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Power load modeling method based on interactive multi-model algorithm

An interactive multi-model, power load technology, applied in computing, electrical digital data processing, instruments, etc., can solve problems such as load model errors

Active Publication Date: 2015-12-23
SHANDONG UNIV
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Problems solved by technology

When the actual load composition changes, the traditional load model will inevitably have certain errors

Method used

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  • Power load modeling method based on interactive multi-model algorithm
  • Power load modeling method based on interactive multi-model algorithm
  • Power load modeling method based on interactive multi-model algorithm

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Embodiment Construction

[0090] The present invention is described in detail below in conjunction with accompanying drawing:

[0091] A power load modeling method based on an interactive multi-model algorithm is modeled in the form of recursive calculation, including the following steps:

[0092] Step 1: Determine the structure of the model in the electric load model set as SLM;

[0093] Step 2: Set a two-level model set. The first-level model contains a relatively small number of models to represent the load components, and each model is assigned a weight. Each model in the first level corresponds to a sub-model set in the second-level model set, and the second-level model set is used to adjust the first-level model; set a threshold, if the error of the first-level model is less than the threshold, Then keep the model unchanged, if the error of the model is greater than the threshold within a certain period of time, use the sub-model set in the second-level model set to adjust the corresponding firs...

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Abstract

The invention discloses a power load modeling method based on an interactive multi-model algorithm. The method includes the steps that model state variable and covariance matrix interaction is performed on the state variable and state covariance matrix, at the time k-1, of each model in a first model set, and interacted state variables and covariance matrixes of the models are obtained; the corresponding state variables and covariance matrixes of the models are input into corresponding extended Kalman filters for model state estimation, and estimated state variables and covariance matrixes, at the time k, of the models are obtained; the weights of the modes are calculated according to likelihood function values and information covariance matrixes in model state estimation, and weighted summation is performed on the weights of all submodels to obtain the parameters of the corresponding models, wherein the weights of the models are used for state interaction at the next time and model power output fusion at the current time. The load modeling process is recursively achieved, the covariance matrixes do not need to be stored, and therefore memory space is saved.

Description

technical field [0001] The invention relates to an electric load modeling method, in particular to an electric load modeling method based on an interactive multi-model algorithm. Background technique [0002] Power load is an important part of power system. In the design, operation and analysis of the power system, it is very necessary to establish an accurate load model, and the accuracy of the model affects the accuracy of the digital simulation and analysis of the power system. The power system is mainly composed of three parts: generator, transmission network and power load. At this stage, the generator model and electrical network model are quite mature, but the load model is relatively simple. This has seriously restricted the improvement of the accuracy and reliability of the power system digital simulation results. Moreover, the load model also has a certain influence on the quantitative calculation of the dynamic behavior of the power system, such as power flow c...

Claims

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Application Information

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IPC IPC(8): G06F17/50
Inventor 王振树马阳阳
Owner SHANDONG UNIV
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