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Method for estimating nonlinear state of substation-dispatching center two-stage distributed power grid

A distributed power grid, nonlinear state technology, applied in the direction of power network operating system integration, electric vehicles, electrical devices, etc., can solve the problems of three-phase imbalance and low estimation accuracy

Active Publication Date: 2013-05-01
TSINGHUA UNIV
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Problems solved by technology

At the same time, three-phase unbalance is also an important reason for the low accuracy of traditional state estimation.

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  • Method for estimating nonlinear state of substation-dispatching center two-stage distributed power grid
  • Method for estimating nonlinear state of substation-dispatching center two-stage distributed power grid
  • Method for estimating nonlinear state of substation-dispatching center two-stage distributed power grid

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[0041] The non-linear state estimation method of substation-dispatching center two-level distributed power grid proposed by the present invention, its flow chart is as follows figure 1 shown, including the following steps:

[0042] (1) Let T1 be the state estimation period of the substation of the power grid, T2 be the state estimation period of the dispatching center of the power grid, T1

[0043] (2) Assuming that the thre...

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Abstract

A substation-control center tow-level distributed grid nonlinear state estimation method is provided. The method comprises steps of: collecting RTU measurement data and PMU measurement data at each voltage level in each substation; performing a first three-phase state estimation to obtain a first estimation result, and removing bad data from the RTU measurement data and the PMU measurement data to estimate a state of a CB; forming a new CB island at each voltage level, and performing a second three-phase state estimation for the new CB island to obtain a final estimation result, in which the new CB island is a bus; processing the final estimation result to obtain ripe data; and collecting the ripe data and / or a part of the RTU measurement data and a part of the PMU measurement data and performing a whole grid state estimation.

Description

technical field [0001] The invention relates to a nonlinear state estimation method of a substation-dispatching center two-level distributed power grid, belonging to the technical field of power system operation and control. Background technique [0002] Energy management system (Energy management system, hereinafter referred to as EMS) is a computer-based dispatch automation system for modern power systems. Its task is to collect, monitor, analyze, optimize and control decisions in real time for power systems. Power system state estimation is the foundation and core link of EMS. State estimation uses real-time measurement information collected from the power system to eliminate error information and calculate complete, consistent and credible real-time variables of the power system to ensure EMS control decision-making. correctness. [0003] Traditional state estimation is implemented in the power dispatching center, and the remote terminal unit (Remote Terminal Unit, here...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/00H02J13/00G01R21/00
CPCY02E60/728Y04S10/265H02J3/00H04L12/66H02J2003/007Y02B70/30Y02E40/70Y02E60/00Y04S10/00Y04S10/22Y04S20/20H02J2203/20
Inventor 孙宏斌张伯明吴文传郭庆来李青芯
Owner TSINGHUA UNIV
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