Filter capacitor failure detection method for inverter
A technology of filter capacitor and detection method, applied in the field of electric power, can solve problems such as damage to filter capacitor, short circuit of filter capacitor, influence on the operation stability of inverter, etc., to achieve the effect of improving accuracy, improving accuracy and simple judgment method.
Inactive Publication Date: 2020-06-09
厦门科华数能科技有限公司
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Problems solved by technology
However, the filter capacitor in the filter will be damaged during the operation of the inverter, such as short circuit or open circuit of the filter capacitor, which will affect the operation stability of the inverter and bring unpredictable consequences
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[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are preferred embodiments of the invention and should not be seen as excluding other 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.
[0031] In the claims, description and above-mentioned drawings of the present invention, unless otherwise clearly defined, the terms "first", "second" or "third" are used to distinguish different objects, not for Describe a specific order.
[0032] In the claims, description and above-mentioned drawings of the present invention, if the terms "comprising", "having" and their variants are used, it is intended to mean "including but not limited...
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The invention discloses a filter capacitor failure detection method for an inverter. When a DC bus midpoint is connected with the input midpoint of an inversion module, the method comprises the following steps that: an instantaneous voltage value between the DC bus midpoint and the common end of a three-phase filter capacitor is obtained; whether the instantaneous voltage value is greater than orequal to a set first threshold T1 or not is judged, and if the instantaneous voltage value is greater than or equal to the set first threshold T1, it is determined that the filter capacitor needs to be overhauled or replaced. According to the method, the value range of the set first threshold value T1 is larger than 0 and is smaller than or equal to 1.225 UN, wherein UN is a power grid phase voltage effective value. The detection method provided by the invention has the advantages of simplicity, small acquired data volume and simple operation.
Description
technical field [0001] The invention relates to the field of electric power technology, in particular to a method for detecting failure of a filter capacitor of an inverter. Background technique [0002] Inverter (also known as converter or inverter) is a device that can convert direct current (DC) into alternating current (alternating current, AC), mainly including inverter module and logic control module. part. Wherein, the logic control module (such as a pulse width modulation (Pulse Width Modulation, PWM) controller) controls the switching tube (such as an insulated gate bipolar transistor (insulated gate bipolartransistor, IGBT) or metal Oxide field-effect transistor (metal-oxide semiconductor or field effect transistor, MOS-FET) control of on-off state, converts the input direct current into alternating current. At present, inverters and inverter circuit topologies have been widely used in photovoltaic power grids, air conditioners, televisions and other equipment. ...
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IPC IPC(8): H02M7/44H02M1/12H02J3/01
CPCH02J3/01H02M1/12H02M7/44Y02E40/40
Inventor 谢程洲许林毅曾立钊郑振霖
Owner 厦门科华数能科技有限公司