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An Improved Control Method of High Frequency Hybrid Filter Based on Silicon Carbide

A hybrid filter and control method technology, applied in harmonic reduction devices, AC networks to reduce harmonics/ripples, etc., can solve problems such as phase angle margin hybrid filter instability

Active Publication Date: 2021-07-23
ELECTRIC POWER RES INST OF GUANGXI POWER GRID CO LTD
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Problems solved by technology

[0005] The purpose of the present invention is to provide an improved control method for a high-frequency hybrid filter based on silicon carbide, thereby overcoming the problem that the hybrid filter fails when compensating for high-order harmonics due to the reduction of the system phase angle margin of the hybrid filter. Steady disadvantages

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  • An Improved Control Method of High Frequency Hybrid Filter Based on Silicon Carbide
  • An Improved Control Method of High Frequency Hybrid Filter Based on Silicon Carbide
  • An Improved Control Method of High Frequency Hybrid Filter Based on Silicon Carbide

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Embodiment

[0087] Using the improved control method of the high-frequency hybrid filter based on silicon carbide and the high-frequency harmonic parallel compensation device based on silicon carbide, the simulation parameters in Table 1 are simulated, and the load injects 21-27 harmonics into the power grid.

[0088] Table 1

[0089] K R

[0090] The grid current waveform obtained by simulation before using the silicon carbide-based high-frequency hybrid filter 9 is as follows figure 2 As shown, by fast Fourier analysis figure 2 As a result, the harmonic distortion rate at this time is 11.51% (eg image 3 shown); the grid current waveform obtained by using the silicon carbide-based high-frequency hybrid filter 9 simulation is shown in Figure 4 As shown, by fast Fourier analysis Figure 4 As a result, the harmonic distortion rate at this time is 2.55% (eg Figure 5 shown). It can be seen that the improved control method of the silicon carbide-based high-frequency hybrid ...

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Abstract

The invention discloses an improved control method for a silicon carbide-based high-frequency hybrid filter, and relates to the technical field of high-frequency harmonic parallel compensation, by connecting the silicon carbide-based high-frequency hybrid filter in series between the grid and the active filter During the period, the rated capacity of the active filter can be reduced by the voltage division effect of the capacitor of the high-frequency hybrid filter. Due to the introduction of the capacitor, the phase shift of the compensation current generated by the filter will occur. Through the method of the present invention, the current signal Extract specific harmonic components, and perform first-order differential, proportional, and compensation on the harmonic components, and then inversely transform the dq rotating coordinate system, and output harmonic currents with the same frequency and opposite phase as the harmonic source through the control of the hysteresis loop controller.

Description

technical field [0001] The invention belongs to the technical field of high-frequency harmonic parallel compensation, and in particular relates to an improved control method of a silicon carbide-based high-frequency hybrid filter. Background technique [0002] With the rapid rise of new energy power generation, the power system is undergoing drastic changes. Since the power electronic equipment widely used in new energy power generation in the power grid is based on PWM control technology, the wide application of PWM control will lead to low-order harmonics in the power grid. The wave content is reduced, and the wide frequency domain characteristics of the mid-high frequency harmonic content are significantly increased. The continuous rise of high-frequency harmonic content will not only pollute the power quality of the power grid, reduce the utilization rate of power energy, but also reduce the reliability of the power grid, interfere with the electrical equipment on the po...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/01
CPCY02E40/40
Inventor 周柯罗凤坚鲁林军张阁刘路高立克丘晓茵王晓明王斌林翔宇
Owner ELECTRIC POWER RES INST OF GUANGXI POWER GRID CO LTD
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