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Higher harmonic active stabilization device and method for alternating current/direct current hybrid microgrid

A technology of AC-DC mixing and high-order harmonics, which is applied to the AC network to reduce harmonics/ripples, harmonic reduction devices, and single AC networks with different frequencies, etc., which can solve the problem of unable to suppress high-order harmonics and stabilize Poor performance and other problems, to achieve the effect of reducing capacitance, good damping effect, and system stability

Active Publication Date: 2019-09-06
HUAZHONG UNIV OF SCI & TECH +1
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Problems solved by technology

[0006] Aiming at the defects of the prior art, the purpose of the present invention is to provide an active high-order harmonic stabilization device and method for an AC-DC hybrid microgrid, aiming to solve the problem that the existing AC-DC hybrid microgrid system cannot suppress the harmonics greater than 1kHz Higher harmonics, leading to poor stability

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  • Higher harmonic active stabilization device and method for alternating current/direct current hybrid microgrid

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[0040] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0041] The present invention provides a high-order harmonic active stabilization device and method for an AC-DC hybrid micro-grid, a power quality adjustment device with a high-frequency switch frequency of 100 kHz in the high-order harmonic active stabilization device for an AC-DC hybrid micro-grid, which can Real-time detection solves the occurrence of resonance in the AC system of the microgrid and the voltage fluctuation in the DC system. Once the system is unstable, inject corresponding damping current or The compensation current can effectively suppress the high-order harmonics of 1kHz to 10k...

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Abstract

The invention discloses a higher harmonic active stabilization device and method for an alternating current / direct current hybrid microgrid. A core is the higher harmonic active stabilization device with a switching frequency of 100kHz, which is used for compensating higher harmonics in the alternating current / direct current hybrid microgrid. The device disclosed by the invention comprises a DC / ACconverter and a DC / DC converter, and is provided with two ports; the output end of the DC / AC converter is connected with an AC bus, and outputs a damping current for restraining the higher harmonicson the AC side; the output end of the DC / DC converter is connected with a DC bus, and outputs a compensation current for compensating higher ripples on the DC side; and a coordination control method based on current feedforward compensation is adopted, so that the voltage fluctuation of an energy storage capacitor is restrained, and the capacity and the size of the capacitor are greatly reduced. According to the higher harmonic active stabilization device and method for the AC / DC hybrid microgrid, an AC / DC hybrid microgrid system can be more stable.

Description

technical field [0001] The invention belongs to the field of power quality control of micro-grids, and more specifically relates to a high-order harmonic active stabilization device and method for AC-DC hybrid micro-grids. Background technique [0002] As an important supplement to the traditional large power grid, microgrid is of great significance in renewable energy power generation, power supply in remote areas such as islands, and improvement of power supply reliability. In recent years, a large number of microgrid demonstration projects have emerged in my country. With the deepening of microgrid research, more and more people pay attention to the power quality problem in microgrid. [0003] The traditional power system uses high-power, centralized power generation, but renewable energy power generation has the characteristics of scattered resources, which is more suitable for decentralized access to the power grid. Therefore, micro-grids often contain a large number of...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/01H02J3/02
CPCH02J3/01H02J3/02Y02E40/40
Inventor 戴珂徐宏伟潘非张卫平孙玉鸿何颖吴奇
Owner HUAZHONG UNIV OF SCI & TECH
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