High-frequency harmonic parallel compensation device based on silicon carbide

A technology for high-frequency harmonics and harmonic compensation, which is applied to harmonic reduction devices and AC networks to reduce harmonics/ripples, etc., can solve problems such as limited compensation capabilities and inability to compensate high-frequency harmonics, and achieve high switching Speed, high withstand voltage, and the effect of improving the phase offset of harmonic compensation current

Active Publication Date: 2019-03-15
ELECTRIC POWER RES INST OF GUANGXI POWER GRID CO LTD
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Problems solved by technology

[0006] The purpose of the present invention is to provide a high-frequency harmonic parallel compensation device based on silicon carbide, thereby solving the problem that the existing active filter mainly uses IGBT switching devices, so that the compensation ability of the active filter for high-frequency harmonics is limited by The switching frequency of the IGBT cannot effectively compensate the high-frequency harmonics

Method used

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  • High-frequency harmonic parallel compensation device based on silicon carbide
  • High-frequency harmonic parallel compensation device based on silicon carbide
  • High-frequency harmonic parallel compensation device based on silicon carbide

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Embodiment 1

[0060] i sa , i sb , i sc is the current output by the harmonic source 8 (load), which includes the fundamental component i saf , i sbf , i scf with the harmonic component i sah (n), i sbh (n), i sch (n), where i sah (n) represents the nth harmonic of phase a current, i sbh (n) indicates the nth harmonic of phase b current, i sch (n) indicates the nth harmonic of phase c current, namely:

[0061]

[0062] In formula (6), ∑ n i sah (n) represents the sum of all frequency harmonics of phase a, ∑ n i sbh (n) represents the sum of all frequency harmonics of phase b, ∑ n i sch (n) represents the sum of all frequency harmonics of phase c.

[0063] Assuming that the harmonic source 8 contains the 23rd harmonic, the expression of the corresponding harmonic source current is shown in formula (7):

[0064]

[0065] The harmonic source current extracted by the harmonic acquisition device is transformed from the abc three-phase static coordinate system to the alpha / ...

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Abstract

The invention discloses a high-frequency harmonic parallel compensation device based on silicon carbide, and relates to the technical field of high-frequency harmonic parallel compensation. Accordingto the high-frequency harmonic parallel compensation device based on silicon carbide provided by the invention, a nonlinear load is simulated by a harmonic source to generate harmonic waves; a capacitor is arranged inside an active filter, the capacitor is serially connected between the active filter and a three-phase alternating current power grid, the voltage level on the output side of the active filter can be reduced effectively, and the active filter can be applied to a high-voltage network; simultaneously, the device is high in impedance for fundamental current and low in impedance for harmonic current; harmonic compensation current which can cancel out harmonic current component in load current in the harmonic waves generated by the harmonic source is generated by the active filter,so that the device solves the disadvantages that an existing active filter mainly uses an IGBT switch device, the compensation ability of the active filter for high-frequency harmonic waves is subjected to the switching frequency of IGBT and the high-frequency harmonic waves cannot be compensated effectively.

Description

technical field [0001] The invention belongs to the technical field of high-frequency harmonic parallel compensation, and in particular relates to a high-frequency harmonic parallel compensation device based on silicon carbide. Background technique [0002] In recent years, a large number of distributed new energy power generation equipment have been connected to the power grid, which has caused profound changes in the power supply type and characteristics of the power grid, the topology of the power grid, and the load composition, resulting in low-order harmonics in the power grid. The harmonic content gradually decreases, the harmonic content in the middle and high frequency bands continues to rise, and the new feature of "wide frequency domain" with a large harmonic frequency domain span. At the same time, because the distribution parameters of long-distance transmission lines are equivalent to multiple LCL circuits connected in series in the circuit, the harmonics of a s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/01
CPCH02J3/01Y02E40/40
Inventor 周柯楚红波丘浩金庆忍丘晓茵郭敏陈卫东姚知洋
Owner ELECTRIC POWER RES INST OF GUANGXI POWER GRID CO LTD
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