Resonant current limiting system and control method

A resonant, phase current technology, applied in the field of power electronics, can solve the problem that the LC filter has a large influence on the grid impedance parameters, and achieves the effect of stabilizing the load voltage, limiting the fault current, and optimizing the investment cost.

Active Publication Date: 2017-05-31
HUNAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the filtering effect of the LC filter is usually greatly affected by the impedance parameters of the grid; while the LCL filter topology is relatively complex, but the filtering effect is very significant.

Method used

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  • Resonant current limiting system and control method
  • Resonant current limiting system and control method
  • Resonant current limiting system and control method

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Embodiment Construction

[0025] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is only some embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0026] figure 1 A topological structure diagram of a resonant current limiting system provided for the embodiment of the present invention, such as figure 1 As shown, the resonant current limiting system of this embodiment is as follows.

[0027] The resonant current limiting system includes: three phase branches, which correspond to phase A, ph...

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Abstract

The invention provides a resonant type current limiting system and a control method thereof. The resonant type current limiting system comprises three phase branches. Every phase branch is composed of a transformer, a PWM (pulse-width modulation) rectification module, a cascade inversion module and a three-phase (temperature coefficient of resistance) branch with (metal oxide varistor) protection, wherein the primary stage of the transformer is connected with a power grid; the PWM rectification module is connected with the secondary stage of the transformer for rectifying the output voltage of the transformer; the input end of the cascade inversion module is connected with the output end of the PWM rectification module; an LCL filter is connected between the output end of the cascade inversion module and a non-linear load, and the output filter is used for filtering the voltage output by the cascade inversion module and outputting the filtered voltage to the non-linear load; the three-phase TCR branch with the MOV protection is connected between the filtering inductor and the filtering capacitor at the inverter outlet of the LCL output filter. The resonant type current limiting system and the control method thereof can provide a multifunctional current limiter to stabilize load voltage, limit fault current and achieve resonant current management during a fault period, thereby enhancing safety of the power grid.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a resonant current limiting system and a control method. Background technique [0002] Electric energy is a basic energy widely used in industry and people's daily life. In recent years, with the rapid development of my country's industrialization, the use of variable speed drives and power electronic equipment in the industry has increased a lot, and the use of power capacitors in power systems has increased, making power quality and harmonic issues more and more concerned. Non-linear and impact loads not only cause voltage fluctuations, reactive power increases, and three-phase imbalances, but also inject a large number of harmonics into the grid, which brings additional burdens to the grid and seriously affects the power supply quality of the power system. . On the one hand, due to poor regulation of reactive power compensation, the grid voltage is too high or too ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/01H02H9/02
CPCH02H9/02H02J3/01H02J3/12Y02E40/40
Inventor 涂春鸣姜飞帅智康兰征肖凡刘子维杨健郭祺吴连贵
Owner HUNAN UNIV
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