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A Resonance Suppression Method of Grid-Connected Converter Considering the Distributed Capacitance of Transmission Line

A technology of distributed capacitance and transmission lines, which is applied in the direction of circuit devices, AC network circuits, electrical components, etc., can solve problems such as deterioration of system resonance characteristics, achieve simple discretization, suppress the deterioration of system resonance characteristics, and reduce the amount of calculation in the system Effect

Active Publication Date: 2019-08-30
TAIYUAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the problem of deterioration of system resonance characteristics caused by line distribution parameters, the present invention provides a method for suppressing resonance of grid-connected converters that takes into account the distributed capacitance of transmission lines

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  • A Resonance Suppression Method of Grid-Connected Converter Considering the Distributed Capacitance of Transmission Line
  • A Resonance Suppression Method of Grid-Connected Converter Considering the Distributed Capacitance of Transmission Line
  • A Resonance Suppression Method of Grid-Connected Converter Considering the Distributed Capacitance of Transmission Line

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Embodiment Construction

[0051] The present invention will be further described below in conjunction with specific examples.

[0052] A method for suppressing resonance of a grid-connected converter considering the distributed capacitance of a transmission line, comprising the following steps:

[0053] ① Detect and collect the three-phase voltage U of the grid-connected point a , U b , U c and the three-phase current I injected into the grid a , I b , I c ;Detect the three-phase voltage U on the grid side sa , U sb , U sc and grid-side three-phase current I sa , I sb , I sc ;

[0054] ②The three-phase voltage U of the grid-connected point a , U b , U c Input the abc / dq0 module to get the grid-connected point voltage d and q-axis components U d and U q ;

[0055] ③The three-phase current I will be injected into the power grid a , I b , I c Input the abc / dq0 module to get the grid-connected point current d, q-axis component i d and i q ;

[0056] ④ Given grid-connected active powe...

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Abstract

The invention discloses a grid-connected converter resonance suppression method considering distributed capacitance of a power transmission line, relates to the field of grid-connected converter operation and control in large-scale new energy power generation, and is a grid-connected converter resonance damping technique for suppressing system resonance characteristic deterioration caused by the ground distributed capacitance of the line. The grid-connected converter resonance suppression method is a control method for a grid-connected converter based on forward path additional digital filterdamping, namely a digital filter is added in a conventional control circuit. The digital filter damping link involves a low-pass filter, preferably a third-order low-pass filter; when the cutoff frequency is set low, a high-frequency signal can be attenuated to a large extent, so that the cutoff frequency is 400 Hz to 610 Hz; when the system resonant peak amplitude is offset, the system resonanceis suppressed. The grid-connected converter resonance suppression method is simple in discretization in actual digital control, and greatly reduces the amount of system calculation, additional sensorsare not needed, and additional power loss is not generated; the robustness is strong, and the dynamic response is good.

Description

technical field [0001] The invention relates to the field of operation and control of grid-connected converters in large-scale new energy power generation, specifically a method for suppressing resonance of grid-connected converters that takes into account the distributed capacitance of transmission lines, and is a method for suppressing the resonance caused by distributed capacitance of lines to ground Resonance damping technology for grid-connected converters with deteriorating system resonance characteristics. Background technique [0002] At present, due to the increasingly severe situation of energy shortage, new energy technologies such as photovoltaics and wind power have been developed rapidly. Large-scale renewable energy grid-connected power generation can effectively reduce resource investment and environmental pollution to a certain extent. However, when the outgoing line of the transmission line is long, the interaction between the large ground capacitance and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/24H02J3/38
CPCH02J3/24H02J3/382H02J2203/20
Inventor 韩肖清相莹萍王磊任春光梁琛
Owner TAIYUAN UNIV OF TECH
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