A distribution network pmu configuration method and system for improving parameter identification accuracy

A technology of parameter identification and configuration method, which is applied in the direction of circuit devices, measuring electronics, measuring devices, etc., can solve the problem of not being able to determine the optimal layout of the PMU, and achieve the effect of reducing the identification error

Active Publication Date: 2021-02-02
SHANGHAI MUNICIPAL ELECTRIC POWER CO +1
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  • Summary
  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, in practical applications, the relationship between state estimation and parameter estimation is not exactly the same as that of the system power flow. The configuration scheme to improve the accuracy of state estimation through PMU fails to directly combine the PMU configuration target with the overall system parameter identification accuracy, resulting in failure to The overall identification accuracy requirements of the system are used to determine the optimal layout of the PMU

Method used

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  • A distribution network pmu configuration method and system for improving parameter identification accuracy
  • A distribution network pmu configuration method and system for improving parameter identification accuracy
  • A distribution network pmu configuration method and system for improving parameter identification accuracy

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Embodiment 1

[0039] The embodiment of the present invention discloses a distribution network PMU configuration method that improves the accuracy of parameter identification. The main technical problems to be solved include the following points:

[0040] (1) A multi-period mixed measurement parameter identification method based on the least square method. Compared with the transmission network, the distribution network has more voltage levels and a more complex network structure. The commonly used measurement models of the transmission network are no longer applicable to the distribution network. It is necessary to combine the network topology, the number and characteristics of PMU distribution points, and propose a distribution network line parameter identification model suitable for online applications. The method of this embodiment guarantees the identification accuracy through multi-point identification in practical application. After obtaining the basic identification model based on th...

Embodiment 2

[0091] In one or more embodiments, a distribution network PMU configuration system for improving parameter identification accuracy is disclosed, including three modules: mixed measurement identification, dominant parameter analysis, and genetic algorithm configuration. Among them, the hybrid measurement identification module obtains the parameter identification result according to the system topology and PMU configuration data; then in the dominance analysis module, the configuration target is extracted from the identification result; finally, the PMU configuration module forms a configuration scheme, and checks that the scheme is in the iterative times If it meets the configuration requirements, the result will be output if it is satisfied, and it will be identified again if it is not satisfied.

[0092] Or, in some other implementation manners, a PMU configuration system for distribution network that improves the accuracy of parameter identification is disclosed, including: ...

Embodiment 3

[0100] In one or more embodiments, a terminal device is disclosed, including a server, the server includes a memory, a processor, and a computer program stored on the memory and operable on the processor, and the processor executes the The program implements the distribution network PMU configuration method for improving parameter identification accuracy in the first embodiment. For the sake of brevity, details are not repeated here.

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Abstract

The invention discloses a power distribution network PMU configuration method and system for improving parameter identification accuracy. The method comprises the following steps: acquiring a power distribution network topology structure, a PMU distribution number and distribution characteristics; reading the measurement data at the two ends of the line required to be identified and establishing amulti-point parameter identification model; identifying different lines in turn until the whole system is identified so as to obtain identification results; taking the comprehensive dispersion indexwhich can reflect the error of the identification results as the dominant index; taking the overall optimal identification accuracy of branch parameters and the minimum number of PMU configurations asobjectives to establish a unified weighted multi-objective mathematical model; and utilizing the genetic algorithm to optimize the weighted multi-objective mathematical model so as to obtain the optimal configuration result of PMU. The topology structure of the power distribution network and the configuration number and configuration characteristics of PMU can be comprehensively considered and the identification of the overall line parameters of the power distribution system can be realized.

Description

technical field [0001] The invention belongs to the technical field of line parameter identification based on measurement data, and in particular relates to a distribution network PMU configuration method and system for improving parameter identification accuracy. Background technique [0002] The advancement of condition monitoring and data analysis technology supports the improvement of the automation level of the power system, and plays an increasingly important role in the safe and economic operation of the power grid. Accurate grid parameters and network topology are prerequisites for reliable operation of advanced applications. The perfection of SCADA and the application of synchronous measurement terminals in the distribution network make it possible to identify line parameters based on measurement data, which provides a way to improve the management level of line parameters. In particular, the parameter identification method of PMU synchronized phasors at both ends ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J13/00G01R31/00G01R25/00
CPCG01R25/00G01R31/00H02J13/00
Inventor 刘舒房田郁方陈张恒旭鲍伟陆健石访
Owner SHANGHAI MUNICIPAL ELECTRIC POWER CO
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