A Resonant Point Detection Method Based on Constant Voltage Source Converter and Voltage-Current Phase Difference
A technology of voltage, current and detection method, which is applied in the direction of frequency measurement device, frequency to phase shift conversion, etc., can solve the problems of slow detection speed, poor flexibility, complicated detection process, etc. simple effect
Active Publication Date: 2021-11-05
QINGDAO TOPSCOMM COMM
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Problems solved by technology
[0003] At present, the commonly used resonance point detection tools are mostly professional equipment with high cost. After detecting the voltage and current data, the data needs to be uploaded to the host computer for harmonic analysis. Real-time online detection cannot be realized, and the detection speed is slow. The detection process is complicated and the flexibility is poor
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[0038] Attached below Figure 1-11 The present invention is further described with examples, to specifically set forth the technical solutions of the present invention. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.
[0039] combined with figure 1 , a kind of resonance point detection method based on constant voltage source converter and voltage-current phase difference of the present invention, comprises the following steps,
[0040] Step 1, use the attached figure 2 The designed constant voltage source converter injects low-frequency carrier current signals with an amplitude of 10V and frequencies of 550Hz, 1100Hz and 1250Hz into the low-voltage side of the transformer.
[0041] The structure of the constant voltage source converter adopts a three-level structure, and the SVPWM (Space Vector Pulse Width Modulation) modulation algorithm is used...
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The invention discloses a resonance point detection method based on a constant voltage source converter and a voltage-current phase difference, which includes the following steps. Carrier voltage signal; step 2, detecting the voltage signal U(t) and current signal I(t) on the low voltage side of the transformer; step 3, extracting the voltage and current harmonic phase difference at different frequencies on the low voltage side of the transformer according to the sliding DFT algorithm; step Fourth, the resonance point is detected according to the calculated voltage and current harmonic phase difference at different frequencies. This method only needs to inject low-frequency carrier voltage signals of different frequencies into the low-voltage side of the transformer, and at the same time detect the voltage and current signals on the low-voltage side of the transformer, so as to realize automatic detection of the resonance point, without repeated measurement, and the operation is simple. In addition, this algorithm has a small amount of calculation and fully meets the requirements of real-time online detection of low power consumption. This method has been applied in practical projects.
Description
technical field [0001] The invention relates to the field of distribution network automation systems, and relates to a resonance point detection method based on a constant voltage source converter and a voltage-current phase difference. Background technique [0002] In the field of power system, the excellent quality factor of the system is the premise to ensure the safety, stability and economical operation of the system. power compensation. However, due to the use of some electric welding machines and household electrical appliances, there are a large number of harmonic sources in the power grid system. When the capacitor bank is switched, it may cause parallel resonance between the system and the capacitor, resulting in excessive resonance current. Burn the capacitor bank, even damage some other equipment in the power grid, causing serious power accidents. Therefore, the resonance point of the system can be detected in advance, which provides a basis for controlling har...
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IPC IPC(8): G01R23/12
CPCG01R23/12
Inventor 范建华曹乾磊狄克松李健勋尹怀强张亚南徐鹏飞赵新举刘玉林
Owner QINGDAO TOPSCOMM COMM