CVT secondary side measurement result correction method based on internal parameter identification
A technology of internal parameters and measurement results, applied in the direction of measuring devices, measuring electrical variables, instruments, etc., can solve the problems of nonlinear amplitude-frequency and phase-frequency characteristics of the transformation ratio, harmonic transmission distortion, etc., and achieve low measurement accuracy , the effect of improving accuracy
Pending Publication Date: 2022-06-28
XIAN UNIV OF TECH
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[0003] At present, when the capacitive voltage transformer (CVT), which is widely used in the field of high voltage level, measures the harmonic signal, the operating point of the power frequency series resonant circuit composed of the equivalent capacitance of the capacitor voltage divider and the inductance of the compensation reactor will deviate. , the amplitude-frequency and phase-frequency characteristics of the transformation ratio present severe nonlinearity, and there is serious distortion to the transmission of harmonics
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[0104] This section builds in simulink such as figure 1 The 66kV CVT equivalent circuit shown, assuming that the parameters are known, the measured harmonic voltage amplitudes are applied to the primary side as the power supply, the output voltage of the CVT secondary side of the simulation model is obtained, and the error correction coefficient of the simulation is obtained by calculating, Determine the parameters to be identified in the CVT, write the objective function and the fitness function in parallel, obtain the CVT parameter group data through the genetic algorithm, and then draw the frequency response characteristic curve of the CVT part and the overall model and the measured frequency response characteristic curve according to the identified parameters. Analyze the accuracy of the calibration method. The parameter identification results are shown in Table 1. Taking the first group of parameter identification results, the comparison results of the error correction co...
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The invention discloses a CVT secondary side measurement result correction method based on internal parameter identification, and the method employs the characteristic to correct a harmonic measurement result according to the transmission error of different harmonic waves transmitted by the CVT, namely, the spectrum error characteristic of the CVT, thereby achieving the correct harmonic detection through the CVT. A CVT spectrum error characteristic acquisition method is further considered, and a CVT transmission characteristic representation method with high accuracy is obtained by using frequency response test data as little as possible. According to the CVT secondary side measurement result correction method based on internal parameter identification provided by the invention, the correction problem of the CVT secondary side measurement result during harmonic wave measurement can be researched, and a feasible method for accurate harmonic wave measurement is particularly provided for an experimental environment in which a harmonic wave full-band frequency response test is inconvenient to carry out; and a solution and a reference are provided for further improving the power grid harmonic measurement accuracy.
Description
technical field [0001] The invention belongs to the technical field of signal timely processing, and in particular relates to a CVT secondary side measurement result correction method based on internal parameter identification. Background technique [0002] In recent years, the construction of UHVDC and flexible power transmission projects has been accelerating, and the sources of interference such as electrified railways, smelting, new energy and urban rail transit have continued to increase. The penetration rate of nonlinear loads in the power grid has increased year by year. The problem is becoming more and more prominent, posing a great threat to the normal operation of various sensitive equipment in the power grid based on power frequency, and greatly increasing the operating cost of the equipment and the power grid. In recent years, the problem of harmonic voltage in the power system has presented new features and new requirements that are different from traditional te...
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Login to View More IPC IPC(8): G01R35/02
CPCG01R35/02
Inventor 段建东李丰仪赵铭刘坤雄路斌程冉
Owner XIAN UNIV OF TECH