Fault diagnosis method and device for converter filter circuit, and storage medium
A filter circuit and fault diagnosis technology, applied in measurement devices, electronic circuit testing, instruments, etc., can solve problems such as cost increase, switch capacitor burnout, filter circuit line and device temperature rise, etc.
Pending Publication Date: 2020-06-19
BEIJING GOLDWIND SCI & CREATION WINDPOWER EQUIP CO LTD
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Problems solved by technology
[0004] However, the inventors of the present application found that even if the current in the filter circuit continues to be lower than the protection value, the heat will always accumulate, causing the temperature in the filter circuit and devices to rise. If the heat dissipation effect is poor, it will still cause the switch or capacitor to burnt out
In addition, the fuse needs to be replaced after triggering the fault, and the replacement requires downtime, which not only leads to increased cost, but also poor maintainability
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[0034] Features and exemplary embodiments of various aspects of the invention will be described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present invention.
[0035] figure 1 It is the grid-connected structure topology of the wind power converter involved in the embodiment of the present invention. like figure 1 As shown, the wind power converter includes a generator-side power module and a grid-side filter circuit, figure 1 The specific structure of the power module is not given in .
[0036] figure 1 The grid-side filter circuit shown in includes a filter capacitor C f , inductance L c And switching device K, also known as LC filter circuit. figure 1 The inductance L shown in g Set outside the grid side filter circuit, when the inductor Lg is set inside the grid side filter circuit, it is also called LCL filter circuit. where the capacitor C f The branch formed...
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The invention discloses a fault diagnosis method and device for a converter filter circuit, and a storage medium. The fault diagnosis method for the converter filter circuit comprises the steps: detecting the grid-side multi-phase voltage of the filter circuit; obtaining the current of each phase of capacitor branch according to the network side multi-phase voltage and the actual capacitance valueof each phase of capacitor branch in the filter circuit; respectively comparing the current of each phase capacitor branch with an instantaneous current threshold, and judging the state of the filtercircuit according to the comparison result; wherein the actual capacitance value of the capacitor is determined by the corresponding phase input current of the filter circuit and the grid-side voltage when the grid-side power supply is disconnected. By adopting the embodiment of the invention, fault diagnosis can be carried out on the converter filter circuit in advance, and faults of the capacitor branch caused by abnormal current are avoided.
Description
technical field [0001] The invention relates to the technical field of wind power generation, in particular to a fault diagnosis method, device and storage medium for a filter circuit of a converter. Background technique [0002] The wind power converter is the core component of the grid-connected electric energy of the wind power generating set, and the grid side of the wind power converter includes a filter circuit. During operation, the filter circuit on the grid side is easily affected by the grid or converter, and phenomena such as overcurrent and high harmonic content occur, resulting in failure of the capacitor branch in the filter circuit, such as burnout of switches or capacitors. [0003] At present, in order to avoid the capacitor branch fault caused by the abnormal current, the main method is to add a fuse in the filter circuit, and then implement the protection strategy according to the fusing curve. [0004] However, the inventors of the present application fo...
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IPC IPC(8): G01R31/28
CPCG01R31/2836G01R31/2843G01R31/2837
Inventor 李峰周婧
Owner BEIJING GOLDWIND SCI & CREATION WINDPOWER EQUIP CO LTD