A dq impedance measurement method for single-phase AC system
A technology of impedance measurement and single-phase AC, which is applied in measuring devices, measuring electrical variables, measuring resistance/reactance/impedance, etc., can solve the problems of cumbersome measurement process, and achieve the effect of simple and accurate measurement method
Inactive Publication Date: 2021-06-25
SOUTHWEST JIAOTONG UNIV
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Problems solved by technology
At present, in the single-phase system, S.Lissandron et al. proposed the impedance measurement method under the RI system. The measurement method for dq impedance is still in the research stage. Y.Liao et al. proposed a dq impedance measurement method based on Hilbert transform, but When the disturbance frequency is greater than the fundamental frequency, additional disturbance injection is required, and the entire measurement process is cumbersome
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[0034] The present invention will be described in further detail below in conjunction with accompanying drawings and examples.
[0035] This embodiment is carried out on the premise of the technical solution of the present invention, showing a detailed implementation process, and taking injection of voltage disturbance as an example for illustration. Including injection disturbance, measuring system response current and voltage; through FFT method, the corresponding frequency ω in the α axis is obtained 1 +ω p , ω 1 – ω p The phase and peak value of the current and voltage; respectively, the corresponding frequency ω in the αβ coordinate system 1 +ω p The response current and voltage are converted to the dq coordinate system; respectively, the corresponding frequency ω in the αβ coordinate system 1 – ω p The response current and voltage are converted to the dq coordinate system; the total response current and the total response voltage in the dq coordinate system are cal...
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The invention discloses a method for measuring dq impedance of a single-phase AC system, specifically: 1. Injecting a disturbance to measure the response current and voltage of the system; 2. Obtaining the corresponding frequency in the α-axis through the fast Fourier transform FFT method ω 1 +ω p , ω 1 –ω p The phase and peak value of the current and voltage; 3. The corresponding frequency ω in the αβ coordinate system is respectively 1 +ω p The response current and voltage of α are converted to the dq coordinate system; 4. The corresponding frequency ω in the αβ coordinate system is respectively 1 –ω p Convert the response current and voltage to the dq coordinate system; 5. Calculate the total response current and total response voltage in the dq coordinate system; 6. Calculate the system impedance matrix Z in the dq coordinate system dq . The measuring method of the invention is simple and effective, and the result is relatively accurate.
Description
technical field [0001] The invention belongs to the technical field of impedance measurement of a single-phase system, in particular to a dq impedance measurement method for a single-phase AC system. Background technique [0002] With the rapid development of new energy power generation, high-speed railway, high-voltage direct current transmission and control technology, the penetration rate of power electronic converters in power systems is getting higher and higher due to their flexible controllability and high efficiency. The globalization is becoming more and more obvious, and the stability of the power system is facing great challenges. The impedance-based stability analysis method is widely used to analyze the stability of complex power electronic power systems. This method is based on the input or output impedance of parallel or cascaded subsystems in the entire system to perform stability assessment. When the system parameters are unknown, each subsystem can be rega...
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IPC IPC(8): G01R27/02
CPCG01R27/02
Inventor 刘志刚吴思奇
Owner SOUTHWEST JIAOTONG UNIV