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Method and system for state estimation of multi-area power system based on wams measurement

A state estimation and power system technology, applied in computing, electrical components, circuit devices, etc., can solve the problems of state estimation value deviation, difficult to determine algorithm parameters, and inaccuracy.

Active Publication Date: 2018-04-10
CHINA SOUTHERN POWER GRID COMPANY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, some distributed state estimation methods based on mesh or chain communication topology have been studied, but most of the algorithms have shortcomings such as slow convergence speed, difficult to determine algorithm parameters, or specific requirements for communication topology, and none of them take WAMS into account. There is a lack of measurement data, which can easily lead to large deviations in the state estimation value, which is not accurate enough

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  • Method and system for state estimation of multi-area power system based on wams measurement
  • Method and system for state estimation of multi-area power system based on wams measurement
  • Method and system for state estimation of multi-area power system based on wams measurement

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Embodiment 1

[0124] This embodiment introduces in detail the relevant theories involved in the present invention and the specific implementation process of the present invention.

[0125] Aiming at the problems of traditional WAMS with huge amount of data, lack of measurement data and the development of new communication topology (chain or mesh), the present invention proposes a multi-area power system state estimation method for WAMS lack of measurement, such as Figure 4 As shown, there is no need for a coordination center, and it can adapt to any communication topology; under normal WAMS conditions (no missing WAMS measurements), it can quickly converge to the centralized estimated value; when some PMU measurements are missing in WAMS, there is no need to change the original information With a matrix structure, it only needs to execute the distributed consensus protocol several times to make the local estimated value of each sub-region converge to the centralized estimated value after el...

Embodiment 2

[0178] 1) to Figure 5 The IEEE 118 node standard test system with 7 partitions is shown as an example. All nodes are equipped with PMUs, and the voltage phasors of the corresponding nodes and the branch current phasors connected to the nodes are measurable. The measured real and imaginary parts of the node voltage are Gaussian white noise with the true value of the power flow superimposed with the standard deviation σ=0.008, and the measured real and imaginary parts of the branch current are Gaussian white noise with the true value of the power flow superimposed with the standard deviation σ=0.0005 , the weight matrix W is taken as Image 6 for correspondence Figure 5 The communication topology of the system.

[0179] According to the prior knowledge and actual test, the real and imaginary parts of the node voltage phasors in each region converge to the centralized estimated value after finite time average consistency iteration.

[0180] Assume that there is a missing m...

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Abstract

The invention discloses a WAMS measurement-based multi-region power system state estimation method and system. The method comprises the steps as follows: a multi-region state estimation model is built and an optimal solution solving formula of the multi-region state estimation model is obtained; various sub-regions estimate the local state according to locally uploaded WAMS measurement and the multi-region state estimation model and obtain a local state estimation value; the sub-regions execute a distributed consistency protocol, and correct the local state estimation value according to the execution result; whether measurement deficiency exists in the locally uploaded WAMS measurement or not is judged; if so, an iterative correction algorithm under the condition of WAMS measurement deficiency is iteratively executed until the corrected local state estimation value is converged to a centralized estimation value after deficient measurement is eliminated; and otherwise, the local state estimation value corrected by the sub-regions is directly output. The WAMS measurement-based multi-region power system state estimation method and system have the advantages of being high in convergence rate, wide in applicability and accurate, and can be widely applied to the fields of power system analysis and control.

Description

technical field [0001] The invention relates to the field of power system analysis and control, in particular to a multi-area power system state estimation method and system based on WAMS measurement. Background technique [0002] The power system is a large interconnected system covering a vast area. Accurately estimating its operating status and providing real-time and reliable system status information for other advanced applications has always been a long-standing research topic in the power industry. With the technical maturity and popularization and application of the Wide-area Monitor System (WAMS) based on the Phasor Measurement Unit (PMU), the linearity of the power system can be realized by using the WAMS measurement technology. state estimation. However, the dimension of the power system state quantity is very high, and the amount of measured data is too large, which will make the centralized processing very complicated. [0003] In order to overcome the difficu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/00G06F19/00
CPCG16Z99/00H02J3/00H02J2203/20
Inventor 陈亦平蔡永智侯君陈皓勇杨林郭曼兰王巍万楚林刘起兴
Owner CHINA SOUTHERN POWER GRID COMPANY