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State Estimation Method of Power System Considering Spatiotemporal Correlation of New Energy

A space-time correlation and state estimation technology, applied to electrical components, circuit devices, AC network circuits, etc., can solve problems such as incapable of real-time, effective and accurate state estimation, and inability to reflect the dynamic characteristics of the power grid

Inactive Publication Date: 2019-12-24
新疆电力建设调试所有限责任公司 +2
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  • Summary
  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0004] The present invention provides a power system state estimation method that takes into account the time-space correlation of new energy sources, which overcomes the above-mentioned deficiencies in the prior art, and can effectively solve the problem that the existing static estimation method of the power system cannot be used for power grid systems connected to new energy sources. Real-time, effective and accurate state estimation cannot reflect the dynamic characteristics of the power grid

Method used

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  • State Estimation Method of Power System Considering Spatiotemporal Correlation of New Energy
  • State Estimation Method of Power System Considering Spatiotemporal Correlation of New Energy
  • State Estimation Method of Power System Considering Spatiotemporal Correlation of New Energy

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Embodiment 1

[0073] Embodiment 1: as attached figure 1 , 2 , 3, the power system state estimation method considering the space-time correlation of new energy includes the following steps:

[0074] Step 1: Read the grid information data, and obtain the node admittance matrix and branch-node correlation matrix according to the read grid information data. The grid information data includes historical state estimation data, current network parameters of the power system, topology Structure and line impedance, then enter the second step;

[0075] Step 2: Grid system measurement and configuration, establish the measurement functions of voltage amplitude measurement, power injection measurement and power flow measurement according to the node admittance matrix and branch-node correlation matrix, and calculate the measurement according to the measurement function z k , according to the measurement z k Configure the system state, the measurement z of the grid system k Including node voltage am...

Embodiment 2

[0134] as attached Figure 4 , 5 , 6, 7, and 8 show the invention in the attached Figure 4 Tested on the IEEE 30-node system in , where the measurement error is assumed to obey the mean value of 0 and the variance of 10 -6 Gaussian distribution, after the test simulation, the final test results of the voltage amplitude and phase angle of each node are shown in the attached Figure 7 and 8 shown; and then use the traditional static estimation method in the attached Figure 4 The test is carried out on the IEEE 30-node system. After the test simulation, the final test results of the voltage amplitude and phase angle of each node are shown in the attached Figure 5 and 6 shown; attached Figure 5 , 6 , 7, and 8, it can be seen that compared with the traditional state estimation method, the present invention has higher estimation accuracy and can track the operating state of the system in real time.

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Abstract

The invention relates to the technical field of electric power system operation and control technology and provides an electric power system state estimation method taking into account new energy time-space relevance. The method includes steps of 1, reading power grid information data; 2, performing system metering and configuration; 3, performing modeling based on time-space relevance according to new energy system state; 4, performing estimation on Phi 1 and Sk by adopting M groups of history state data; 5, performing state predication of k moment according to estimation values as in the description; 6, performing predication auxiliary state estimation; 7, sending a state estimation result of the k moment to a power grid control center. According to the invention, a defect that static state estimation cannot meet needs for randomness and volatility of new energy grid connection is made up and real time, effective and accurate state estimation on new energy grid connection is realized. Short time state predication accuracy is improved, final state estimation accuracy is improved, and dynamic feature of a power grid are reflected fully. Data support is provided for high level application related to the power system control center.

Description

technical field [0001] The invention relates to the technical field of power system operation and control technology, and relates to a power system state estimation method that takes into account the time-space correlation of new energy sources. Background technique [0002] One of the important features of the smart grid is the large-scale grid-connected power generation of various new energy sources (wind energy, solar energy and other renewable energy sources). Taking Xinjiang Power Grid as an example, in recent years, Xinjiang Power Grid has entered a period of great-leap-forward development, and its installed capacity has maintained an annual growth rate of more than 20%. %, ranking first in the Northwest Power Grid. New energy power generation has the characteristics of randomness, volatility and intermittency, which will bring great uncertainty to the operation of the power grid. At the same time, the integration of new energy into the grid has changed the one-way p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/00
CPCH02J3/00H02J2203/20
Inventor 李德存秦艳辉孙谊媊沈中信刘威麟依力扎提吐尔汗高山闫亚岭王伟祁晓笑王琛焦春雷刘大贵孙冰王方楠罗忠游王四海祁伟
Owner 新疆电力建设调试所有限责任公司
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