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Harmonic wave state estimation method for single transformer substation

A harmonic state estimation, transformer technology, applied in harmonic reduction devices, AC networks to reduce harmonics/ripples, etc., can solve the influence of the dispersion of power grid state parameters, without considering the dispersion of parameters, the phase angle measurement unit High cost and other problems, to achieve the effect of easy synchronization, small scope and strong feasibility

Active Publication Date: 2014-10-01
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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  • Harmonic wave state estimation method for single transformer substation
  • Harmonic wave state estimation method for single transformer substation
  • Harmonic wave state estimation method for single transformer substation

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Embodiment Construction

[0023] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0024] Harmonic State Estimation Theory:

[0025] 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.

[0026] The mathematical model of harmonic state estimation can be expressed as

[0027] Z = HX + ε (1)

[0028] 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 p...

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Abstract

The invention relates to a harmonic wave state estimation method for a single transformer substation. According to the method, all elements in the node voltage phasor quantity and the injected current phasor quantity are classified according to the quantity measurement and the state measurement and sorted according to the sequence of measuring the quantity first and then the state, and a node admittance matrix is partitioned correspondingly and transformed to obtain a quantity measurement equation; according to a network topology structure operates independently for a single three-winding transformer, known current quantity measurement points and known voltage measurement points are numbered, node number combinations are written out of partitioned matrix bodies of the admittance matrix and then substituted into the quantity measurement equation for calculating the state phasor quantity. The method is high in estimation accuracy, easy to realize and low in 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 single-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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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/01
CPCY02E40/40
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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