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
CN104062501AActive Publication Date: 2014-09-24STATE GRID CORP OF CHINA +2
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
STATE GRID CORP OF CHINA
Publication Date
2014-09-24

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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.
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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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