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A Power System State Estimation Method Based on Phasor Measurement

A power system, phasor measurement technology, applied in the direction of calculation, electrical components, circuit devices, etc., can solve the problems of phase angle error without tolerance, ignoring correlation, and increasing the scale of coefficient matrix

Active Publication Date: 2017-01-04
TSINGHUA UNIV
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Problems solved by technology

However, this method introduces conversion errors when converting the phasor into real and imaginary parts; and ignores the correlation between the real and imaginary parts of the same phasor; in addition, after the phasor is converted into real and imaginary parts, the coefficient matrix The scale increases, which increases the amount of calculation; at the same time, the method is not robust to phase angle errors

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  • A Power System State Estimation Method Based on Phasor Measurement
  • A Power System State Estimation Method Based on Phasor Measurement
  • A Power System State Estimation Method Based on Phasor Measurement

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Embodiment Construction

[0041] The method for estimating the state of a power system based on phasor measurement in the present invention comprises the following steps:

[0042] (1) Establish a complex quantity measurement equation for power system state estimation based on phasor measurement, the specific process is as follows:

[0043] (1-1) Establish the voltage measurement equation and current measurement equation of the power system:

[0044] In each phasor measurement, the voltage phasor measurement equation is:

[0045] U · m , i = U · T , i + ε · U , i

[0046] in and are the measured value, true value and measurement error of the i-th voltage phasor, respectively, and the measured value, true value and measure...

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Abstract

The invention relates to a method for estimating the state of a power system based on phasor measurement, and belongs to the technical field of power system operation and control. The method of the present invention establishes a complex quantitative measurement equation based on full PMU measurement in the complex number domain. The measurement and state quantities in the measurement equation have a linear relationship, and at the same time directly establishes an optimization objective function for the super quantitative measurement equation in the complex number domain, and proposes The relative least square method of complex numbers is used to solve the measurement equation, so that the state estimation calculation based on the full PMU measurement is directly completed in the complex number domain. This method extends the state estimation of the power system from the real number domain to the complex number domain, and the state estimation result can be directly obtained through one calculation. Due to the complex number method, it has strong tolerance to phase angle errors, and the algorithm efficiency is very high. At the same time, the method of the present invention considers the self-weighting effect of the least square method, thus improving the accuracy of the state estimation of the power system.

Description

technical field [0001] The invention relates to a method for estimating the state of a power system based on phasor measurement, and belongs to the technical field of power system operation and control. Background technique [0002] In recent years, with the rapid deployment of phasor measurement units (Phasor Measurement Unit, hereinafter referred to as PMU) in the power grid, a large number of phasor measurements provide new data for power system analysis and calculation. However, compared with active power measurement, the accuracy of PMU phase angle measurement is not enough, and due to network communication interruption, measurement equipment failure, etc., there may be bad data in PMU measurement. At the same time, the PMU installed in the power grid at this stage , and its measurement accuracy is not very satisfactory. Therefore, the PMU measurement data cannot be used directly, and the state estimation based on the full PMU measurement is necessary. [0003] At pre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/00G06F19/00
Inventor 程云峰陆超
Owner TSINGHUA UNIV
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