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High-frequency second harmonic interference resistant circuit system with novel-structure output channel

An output channel, second harmonic technology, applied in harmonic reduction devices, AC networks to reduce harmonics/ripples, etc., can solve the problems of surge impact, inability to effectively prevent channel high frequency second harmonic interference, etc. , to achieve the effect of eliminating low-order harmonics, increasing the equivalent switching frequency, and high power factor

Pending Publication Date: 2022-03-11
BAIYANGHE POWER PLANT OF HUANENG SHANDONG POWER GENERATION CO LTD
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Problems solved by technology

[0004] The purpose of the present invention is to solve the shortcomings in the prior art that the high-frequency second harmonic interference between the channels cannot be effectively prevented and the high-voltage instantaneous surge impact, and a new structure output channel is proposed to resist the high-frequency second harmonic Harmonic interference circuit system

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  • High-frequency second harmonic interference resistant circuit system with novel-structure output channel
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  • High-frequency second harmonic interference resistant circuit system with novel-structure output channel

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Embodiment Construction

[0049] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention.

[0050] refer to Figure 1-6, a new structure output channel anti-high-frequency second harmonic interference circuit system, including a blockage dredging system, a complementary cancellation system and a modular multi-level structure system;

[0051] The block grooming system includes an inductive block module, a capacitive grooming module, a fusion derivative module, a high-order filter, and a PWM rectifier;

[0052] The inductance blocking module is used to use the high-frequency and high-impedance characteristics of the inductor to make the inductance block the harmonic current from flowing into the system. The capacitor dredging module is used to use the capacit...

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Abstract

The invention discloses a novel structure output channel anti-high-frequency second harmonic interference circuit system, which relates to the field of high-frequency harmonic interference, and comprises a block dredging system, a complementary cancellation system and a modular multi-level structure system, the retardation dredging system comprises an inductance retardation module, a capacitance dredging module, a fusion derivation module, a high-order filter and a PWM rectifier. The characteristics of high frequency and high impedance of the inductor and high frequency and low impedance of the capacitor are utilized, the inductor blocks harmonic current from flowing into the system, the capacitor is used for diverting and shunting the harmonic current, LC and LCL type filtering PWM rectifiers and other higher-order input filtering derivations can be formed through cooperation of the inductor and the capacitor, high-frequency harmonic waves are effectively filtered through the high-order filter, and the filtering efficiency is improved. Stable direct current is provided for a follow-up direct current link and an inversion link, and meanwhile, by controlling input current sine and maintaining the same phase with grid-side power grid voltage, the purposes that the grid-side harmonic content is small and the power factor is high are achieved.

Description

technical field [0001] The invention relates to the technical field of high-frequency harmonic interference, in particular to a new structure output channel anti-high-frequency second harmonic interference circuit system. Background technique [0002] With the development of power electronic technology at home and abroad, a large number of electrical equipment with nonlinear characteristics composed of power electronic switches are widely used in metallurgy, steel, transportation, chemical and other industrial fields, such as electrolysis devices, electric locomotives, rolling mills, etc. Machinery, high-frequency furnace, etc., so the harmonic pollution in domestic and foreign power grids is becoming increasingly serious. One of the characteristics of high-power occasions is that switching devices cannot use too high a frequency. On the one hand, because the switching loss of the device is relatively large at high power, the switching loss at high frequency cannot be toler...

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 周海龙林旭东尹震东冷述文李杰郭肖男丛雯锴张鹏
Owner BAIYANGHE POWER PLANT OF HUANENG SHANDONG POWER GENERATION CO LTD
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