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Improved control method for high-frequency hybrid filter based on silicon carbide

A hybrid filter and control method technology, applied in harmonic reduction devices and AC networks to reduce harmonics/ripples, etc., can solve problems such as phase angle margin hybrid filter instability, improve dynamic characteristics, speed up The effect of speed of response

Active Publication Date: 2019-05-31
ELECTRIC POWER RES INST OF GUANGXI POWER GRID CO LTD
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  • Application Information

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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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  • Improved control method for high-frequency hybrid filter based on silicon carbide
  • Improved control method for high-frequency hybrid filter based on silicon carbide
  • Improved control method for 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 high-frequency hybrid filter based on silicon carbide and relates to the technical field of high-frequency harmonic parallel compensation. Thehigh-frequency hybrid filter based on silicon carbide is connected in series between a power grid and an active filter. The voltage division effect of a capacitor of the high-frequency hybrid filter can reduce the rated capacity of the active filter. Since the introduction of the capacitor causes the phase offset of the compensation current generated by the filter, a specific harmonic component ofa current signal is extracted by the method and is subjected to first-order differential, proportional, compensation, and dq rotating coordinate system inverse transformation, and a harmonic currenthaving the same frequency and the inverted phase as a harmonic source is output under the control of a hysteresis 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 Applications(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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