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Double-transformer substation harmonic wave state estimation method

A harmonic state estimation and dual transformer technology, applied in the direction of instruments, measuring electrical variables, measuring current/voltage, etc., can solve the problem of increasing the cost of harmonic state estimation, the influence of the dispersion of power grid state parameters, and the lack of consideration of parameter dispersion, etc. problem, to achieve the effect of improving accuracy, strong feasibility and reducing cost

Active Publication Date: 2014-09-24
STATE GRID CORP OF CHINA +2
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Problems solved by technology

However, in the actual power grid, only some local power grids are equipped with synchronized phasor measurement units, and the monitoring devices installed in most regional power grids do not have the GPS time synchronization function, and the phase angle measurement unit is expensive. Angular measurement unit, which can greatly increase the cost of harmonic state estimation
From the perspective of application range, the existing technical solutions are suitable for large-area power grids with a wide range. In the case of harmonics, the state of the power grid is easily affected by the dispersion of parameters.
However, the factor of parameter dispersion is not considered in the harmonic state estimation of the prior art scheme

Method used

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  • Double-transformer substation harmonic wave state estimation method
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  • Double-transformer substation harmonic wave state estimation method

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Embodiment Construction

[0038] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0039] Harmonic State Estimation Theory:

[0040] Harmonic state estimation takes node voltage as the state quantity, node voltage, branch current and node injection current as the measurement, uses the injection current source to represent the nonlinear load, and realizes decoupling between harmonics.

[0041] The mathematical model of harmonic state estimation can be expressed as

[0042] Z = HX + ε (1)

[0043] In the formula, Z for m ×1-dimensional measurement phasor; X for pending n ×1-dimensional state phasor; H For the relationship between the measured value and the state variable m x n dimensional measurement matrix, which is related to the topology of the system, the basic admittance matrix and the measurement configuration scheme of the system; ε due to random noise, converter errors, and communication proble...

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Abstract

The invention relates to a double-transformer substation harmonic wave state estimation method. The method comprises the steps that all elements in a node voltage phasor and an injection current phasor are classified according to measurement quantity and state quantity, and are arrayed according to the measurement quantity-state quantity sequence, then a node admittance matrix is correspondingly segmented, and a measurement equation is obtained through conversion. As for a parallel running network topology of two three-winding transformers, on the premise that the current measurement point serial number and the voltage measurement point serial number are known, all segmented matrixes of the admittance matrix are written out by combing the node serial numbers, and then are substituted into the measurement equation for calculating a state phasor. The double-transformer substation harmonic wave state estimation method is high in estimation accuracy, easy to implement and low in implementation cost.

Description

technical field [0001] The invention relates to the technical field of harmonic monitoring in electric power systems, in particular to a method for estimating the harmonic state of a double-transformer substation. Background technique [0002] In the prior art, substation harmonic state estimation is researched using the synchronous phase angle measurement unit (PMU) as the technical basis. The synchronous phase angle measurement unit (PMU) in the wide-area measurement system can realize the synchronous collection of dynamic data of each node of the power system by using the high-precision timing signal of the GPS system. Theoretically, the phase angle measurement unit can provide technical support for harmonic state estimation of large-scale regional power grids. However, in the actual power grid, only some local power grids are equipped with synchronized phasor measurement units, and the monitoring devices installed in most regional power grids do not have the GPS time sy...

Claims

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Application Information

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IPC IPC(8): G01R23/16G01R19/00
Inventor 林焱吴丹岳韩斐杨洪耕黄道姗张健张逸
Owner STATE GRID CORP OF CHINA
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