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Parameter identification method based on graph theory and device

A parameter identification and theoretical technology, applied in the direction of electrical digital data processing, special data processing applications, instruments, etc., can solve problems such as parameter errors, achieve the effects of improving accuracy, stabilizing algorithm values, and simplifying the estimation operation process

Pending Publication Date: 2017-04-19
CHINA ELECTRIC POWER RES INST +4
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Problems solved by technology

Due to various reasons, parameter errors cannot be maintained in a timely and correct manner

Method used

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  • Parameter identification method based on graph theory and device
  • Parameter identification method based on graph theory and device
  • Parameter identification method based on graph theory and device

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Embodiment Construction

[0056] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0057] The present invention proposes a parameter identification method and device based on graph theory, which combines the parameter estimation method of PMU measurement equipment and the two-step method parameter estimation based on residuals, so as to solve the problem of identification and estimation of wrong parameters in the power system.

[0058] Such as figure 1 As shown, in the embodiment of the present invention, the parameters of the high-voltage ring network are mainly effectively identified, and the parameters of suspicious equipment can be accurately found, and the parameters can be estimated quickly and accurately, thereby improving the technical data quality of the power grid. Described method comprises the following steps:

[0059] 1) Obtain the conventional SCADA measurement in the transmission networ...

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Abstract

The invention provides a parameter identification method based on graph theory and a device. an equation only comprising reactance parameters is established based on the graph theory; constrained conditions of observability of single power grid section parameters are determined; PMU measurement is adopted for parameter estimation for the devices which are equipped with PMU measurement; two-step parameter estimation is executed on the basis of residual error for the devices which are not equipped with PMU measurement. The pre-estimation of parameter values is quick and accurate; by means of the method, effective identification of high voltage loop grid parameters is achieved; suspicious device parameters can be accurately positioned so that the power grid technical data quality is improved and the practical level of electric power system network analysis is increased.

Description

technical field [0001] The invention belongs to the field of power system analysis and automation, and relates to a parameter identification method and device based on graph theory. Background technique [0002] As my country's UHV AC and DC transmission projects will be put into operation intensively, the long-distance inter-regional and inter-provincial transmission capacity will increase significantly, and the grid structure will undergo major changes. The requirements for the accuracy of online analysis and calculation results of the power system will increase, and parameter errors will have long-term effects. The practical problem of smart grid dispatching control system. The so-called power grid parameters mainly refer to the parameters of lines and transformers, as well as parameters of capacitors and reactors. Line parameters include line resistance, reactance and charging capacitance; transformer parameters include transformer ratio (tap position) and leakage reacta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00
CPCG16Z99/00
Inventor 宋旭日张志君王磊施毅斌郎燕生马晓忱王顺江李理郗洪涛句荣斌刘鹏王梓王铎赵昆张杰高潇王淼张建孙博高长征刘座铭
Owner CHINA ELECTRIC POWER RES INST
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