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Current cooperative control method for upper and lower busbars used in parallel operation of current source rectifiers

A technology of DC bus current and current source type, applied in the direction of converting AC power input into DC power output, irreversible AC power input into DC power output, electrical components, etc., can solve problems such as harmonic distortion and achieve waveform distortion Low efficiency, avoiding overload problems, and solving the effect of unbalanced power

Active Publication Date: 2021-11-05
THE ACAD OF TIANJIN UNIV HEFEI
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Problems solved by technology

However, when the space vector modulation technique is applied to the current source rectifier, it will produce harmonic distortion, especially for high-power converters, when the switching frequency is very low operating conditions
In addition, in the application of high-power current source rectifier, when the sampling frequency of the space vector modulation technique is close to the natural resonance frequency of the output LC filter, the space vector modulation technique may inversely amplify the parallel resonance of the filter

Method used

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  • Current cooperative control method for upper and lower busbars used in parallel operation of current source rectifiers
  • Current cooperative control method for upper and lower busbars used in parallel operation of current source rectifiers
  • Current cooperative control method for upper and lower busbars used in parallel operation of current source rectifiers

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Embodiment Construction

[0033] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific 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.

[0034] Regarding the control of the current source rectifier, Selective Harmonic Elimination (SHE) is one of its core control schemes. Especially, for the working condition of two current source rectifiers running in parallel, ideally, when the two inverters receive the same switching signal, they can output the same power. However, due to the limitation of technical conditions in actual application scenarios, the hardware parameters of the current source rectifiers connected in parallel cannot be 100% consistent, so the parameters such as equivalent impedance of different current source rectifiers are not completely consistent. Therefore, there will inevitably be differences in the ...

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Abstract

The invention discloses a current synergistic control method for the upper and lower busbar currents of current source rectifiers in parallel operation. The upper and lower busbar currents of two rectifiers are sampled and filtered, and then the error between the output current and the reference current of the upper busbars of the two rectifiers is sent to the The proportional integral controller is used for adjustment to obtain the delay angle required for modulation. In addition, the difference of the lower bus current is sent to the proportional integral controller to calculate the bypass pulse width control parameter. The combination of the two can flexibly adjust the output current of the upper and lower bus, and realize the coordinated control of the upper and lower bus currents when the rectifiers are connected in parallel. Purpose.

Description

technical field [0001] The invention relates to a method for synergistic control of upper and lower busbar currents in the parallel environment of multi-current source rectifiers, which can effectively solve the overload problem of a single rectifier under the parallel working condition of multi-current source rectifiers. Background technique [0002] Due to the advantages of simple structure, good short-circuit current blocking characteristics, and natural bidirectional power flow capability, PWM current source converters are widely used in high-power applications such as medium-voltage transmission, high-voltage direct current transmission, renewable energy grid connection, and superconducting energy storage. scene is widely used. In these application scenarios, since the switching frequency of the current source converter is usually lower than 1Khz, the switching loss of the high-power converter can be reduced. [0003] Generally, there are two modulation methods for hig...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/219H02M7/23
CPCH02M7/219H02M7/23
Inventor 王坤放何晋伟
Owner THE ACAD OF TIANJIN UNIV HEFEI
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