CN110556789A - Fault protection method and system for output filter capacitor of vehicle-mounted inverter - Google Patents
Fault protection method and system for output filter capacitor of vehicle-mounted inverter Download PDFInfo
- Publication number
- CN110556789A CN110556789A CN201810562292.6A CN201810562292A CN110556789A CN 110556789 A CN110556789 A CN 110556789A CN 201810562292 A CN201810562292 A CN 201810562292A CN 110556789 A CN110556789 A CN 110556789A
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- Prior art keywords
- inverter
- power
- filter capacitor
- fault protection
- vehicle
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/122—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for inverters, i.e. dc/ac converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/122—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for inverters, i.e. dc/ac converters
- H02H7/1227—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for inverters, i.e. dc/ac converters responsive to abnormalities in the output circuit, e.g. short circuit
Abstract
The invention discloses a fault protection method and a fault protection system for an output filter capacitor of a vehicle-mounted inverter, wherein the input power and the output power of the vehicle-mounted inverter are monitored, the loss power is estimated, and when the input power is greater than a preset multiple of the sum of the output power and the loss power, the fault of the output filter capacitor of the inverter is judged. The inverter has the advantages of no need of increasing hardware modification cost of the existing inverter, low production cost and modification cost, no dependence on an accurate circuit model, convenience in implementation, easiness in engineering realization and the like.
Description
Technical Field
The invention relates to the technical field of vehicle-mounted inverters, in particular to a fault protection method and system for an output filter capacitor of a vehicle-mounted inverter.
Background
The over-current protection of the inverter has the working principle that a bridge arm current sensor of the inverter detects a current peak value, and the capacitor fault can be protected to a certain extent through over-current judgment of the current. However, a large current phenomenon is also triggered by faults such as sudden load switching and output short circuit, and current protection caused by sudden load switching and short circuit needs the converter to perform multiple restart attempts for external faults of the equipment.
The working principle of the output overvoltage protection adopted by the current vehicle-mounted converter is that the output voltage is collected in real time through a voltage sensor, a controller calculates the effective value of the output voltage to judge the overvoltage, and the protection of the output voltage is to protect the output voltage and cannot accurately protect the capacitor fault.
an output filter capacitor used by the vehicle-mounted inverter, which is used as an output filter element of the inverter, needs to bear large harmonic current, and is easy to fail and damage. Because the capacitor does not have a failure and fault detection device, when the capacitor fails or has a fault, the capacitor cannot be automatically stopped and cut off, and the fault of the converter is easily expanded. The vehicle-mounted converter has higher and higher requirements on judgment of element faults, and the vehicle-mounted converter is expected to find the problems in time at the early stage of the faults and maintain the problems in advance. When the element fails, the safety can be timely detected and guided. This puts new demands on the fault diagnosis of the filter capacitor.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: aiming at the technical problems in the prior art, the invention provides the fault protection method and the fault protection system for the vehicle-mounted inverter output filter capacitor, which do not need to increase the hardware modification cost of the existing inverter, have low production cost and modification cost, do not depend on an accurate circuit model, are convenient to implement and are easy to realize in engineering.
In order to solve the technical problems, the technical scheme provided by the invention is as follows: a fault protection method for an output filter capacitor of a vehicle-mounted inverter monitors input power and output power of the vehicle-mounted inverter, estimates loss power, and judges that the output filter capacitor of the inverter has a fault when the input power is larger than a preset multiple of the sum of the output power and the loss power.
Furthermore, after the inverter output filter capacitor is judged to be in fault, the reset response of the inverter is blocked.
further, the preset multiple ranges from 1.05 to 1.2.
Further, the value of the preset multiple is 1.1.
A fault protection system of an output filter capacitor of a vehicle-mounted inverter comprises a power measuring module and a fault protection module;
the power measuring and calculating module is used for monitoring the input power and the output power of the vehicle-mounted inverter and estimating the loss power;
And the fault protection module is used for calculating according to the input power, the output power and the loss power, and judging that the output filter capacitor of the inverter has faults when the input power is greater than a preset multiple of the sum of the output power and the loss power.
Further, the fault protection module is also used for blocking the reset response of the inverter after judging that the output filter capacitor of the inverter is in fault.
Further, the preset multiple ranges from 1.05 to 1.2.
Further, the value of the preset multiple is 1.1.
A fault protection system of an output filter capacitor of a vehicle-mounted inverter comprises a processor and a memory; the processor is configured to run a fault protection program stored in the memory, and the memory stores a fault protection program that is operable to implement the fault protection method according to any one of the above.
Compared with the prior art, the invention has the advantages that:
1. According to the invention, the input power and the output power of the inverter are monitored, the loss power is estimated, whether the filter capacitor fault occurs can be judged, and the input power and the output power can be calculated by monitoring the voltage and the current, so that additional hardware equipment is not required to be added, the conventional inverter can be conveniently upgraded and modified, and the production and modification cost is low.
2. The invention can effectively judge whether the inverter has filter capacitor faults or not, and timely lock the reset response of the inverter when the inverter has faults, the inverter cannot be reset and restarted again, the loss expansion is effectively prevented, the reliability is good, and the quality of the inverter can be effectively improved.
3. The invention carries out calculation and judgment according to the external characteristics of the circuit model, does not need to rely on an accurate circuit model, can conveniently and accurately obtain the capacitance protection parameter through tests, and is convenient for engineering application.
Drawings
Fig. 1 is a schematic diagram of a main circuit structure of an inverter.
FIG. 2 is a schematic flow chart of an embodiment of the present invention.
Detailed Description
The invention is further described below with reference to the drawings and specific preferred embodiments of the description, without thereby limiting the scope of protection of the invention.
As shown in fig. 1, the inverter for vehicles employs a 2-level three-phase bridge circuit having an input current at an input terminal and a capacitive voltage sensor and an output voltage and output current sensor at an output terminal. Capable of detecting an input current (I)d) Input voltage (U)d) Output voltage (U)uv)、(Uvw)、(Uwu) And an output current (I)u)、(Iv)、(Iw)。
As shown in fig. 2, in the method for protecting a fault of an output filter capacitor of a vehicle-mounted inverter according to this embodiment, input power and output power of the vehicle-mounted inverter are monitored, loss power is estimated, and when the input power is greater than a preset multiple of a sum of the output power and the loss power, a fault of the output filter capacitor of the inverter is determined. And blocking the reset response of the inverter after judging that the output filter capacitor of the inverter has a fault. The preset multiple ranges from 1.05 to 1.2. The value of the preset multiple is preferably 1.1.
In the present embodiment, the input power Pi＝Ud×IdOutput power (active power)Phi is a phase angle, a relation curve of loss power and output power can be obtained according to simulation calculation or experimental statistics and is defined as f (x), and loss power P1＝PoX f (x). When P is presenti>(Po+P1) And when the power is multiplied by xn, n is a preset multiple, the power is judged to be abnormal, and the inverter outputs a filter capacitor fault. The preset multiple n ranges from 1.05 to 1.2, preferably 1.1.
In this embodiment, the control logic of the present invention is embedded in the control logic of the inverter, and after determining that the inverter outputs a filter capacitor fault, the reset response of the inverter is blocked, so that the inverter is not reset by receiving an external reset command after being protected and stopped, thereby avoiding the filter capacitor fault expansion caused by repeated restart of the inverter.
It should be noted that the present invention is not limited to the above-mentioned method for monitoring and calculating the input power, the output power and the power loss, and the parameters can be obtained by monitoring and calculating with other special monitoring devices, and can be used in the protection method of the present invention.
A fault protection system of an output filter capacitor of a vehicle-mounted inverter comprises a power measuring module and a fault protection module; the power measuring and calculating module is used for monitoring the input power and the output power of the vehicle-mounted inverter and estimating the loss power; the fault protection module is used for calculating according to the input power, the output power and the loss power, and judging that the output filter capacitor of the inverter has faults when the input power is larger than a preset multiple of the sum of the output power and the loss power. And the fault protection module is also used for blocking the reset response of the inverter after judging that the output filter capacitor of the inverter has a fault. The preset multiple ranges from 1.05 to 1.2. The value of the preset multiple is preferably 1.1.
A fault protection system of an output filter capacitor of a vehicle-mounted inverter comprises a processor and a memory; the processor is configured to run a fault protection program stored in the memory, and the memory stores a fault protection program operable to implement any of the above-described fault protection methods.
The foregoing is considered as illustrative of the preferred embodiments of the invention and is not to be construed as limiting the invention in any way. Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention should fall within the protection scope of the technical scheme of the present invention, unless the technical spirit of the present invention departs from the content of the technical scheme of the present invention.
Claims (9)
1. A fault protection method for an output filter capacitor of a vehicle-mounted inverter is characterized by comprising the following steps: monitoring the input power and the output power of the vehicle-mounted inverter, estimating the loss power, and judging the fault of an output filter capacitor of the inverter when the input power is larger than a preset multiple of the sum of the output power and the loss power.
2. The method for fault protection of the vehicle-mounted inverter output filter capacitor according to claim 1, wherein: and blocking the reset response of the inverter after judging that the output filter capacitor of the inverter has a fault.
3. The fault protection method for the vehicle-mounted inverter output filter capacitor according to claim 1 or 2, characterized in that: the preset multiple ranges from 1.05 to 1.2.
4. the method for fault protection of the vehicle-mounted inverter output filter capacitor according to claim 3, wherein: the value of the preset multiple is 1.1.
5. The utility model provides a fault protection system of on-vehicle inverter output filter capacitor which characterized in that: the system comprises a power measuring module and a fault protection module;
The power measuring and calculating module is used for monitoring the input power and the output power of the vehicle-mounted inverter and estimating the loss power;
And the fault protection module is used for calculating according to the input power, the output power and the loss power, and judging that the output filter capacitor of the inverter has faults when the input power is greater than a preset multiple of the sum of the output power and the loss power.
6. the system of claim 5, wherein: and the fault protection module is also used for blocking the reset response of the inverter after judging that the output filter capacitor of the inverter has a fault.
7. The fault protection system for the vehicle-mounted inverter output filter capacitor according to claim 5 or 6, characterized in that: the preset multiple ranges from 1.05 to 1.2.
8. The system of claim 7, wherein: the value of the preset multiple is 1.1.
9. The utility model provides a fault protection system of on-vehicle inverter output filter capacitor which characterized in that: comprises a processor and a memory; the processor is configured to run a fault protection program stored in the memory, and the memory stores a fault protection program that is configured to implement the fault protection method according to any one of claims 1 to 4 when the fault protection program is run.
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| CN201810562292.6A CN110556789B (en) | 2018-05-31 | 2018-05-31 | Fault protection method and system for output filter capacitor of vehicle-mounted inverter |
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| CN201810562292.6A CN110556789B (en) | 2018-05-31 | 2018-05-31 | Fault protection method and system for output filter capacitor of vehicle-mounted inverter |
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| CN110556789A true CN110556789A (en) | 2019-12-10 |
| CN110556789B CN110556789B (en) | 2021-11-19 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111262462A (en) * | 2020-03-04 | 2020-06-09 | 科华恒盛股份有限公司 | Filter capacitor failure detection method of inverter |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010160001A (en) * | 2009-01-07 | 2010-07-22 | Fuji Electric Systems Co Ltd | Capacitance calculator and degradation detector of main circuit capacitor |
| CN103444037A (en) * | 2011-03-17 | 2013-12-11 | Abb技术有限公司 | Voltage based method for fault identification in a transmission line and apparatus thereof |
| CN103580497A (en) * | 2012-07-26 | 2014-02-12 | Ls产电株式会社 | Apparatus for estimating capacitance of DC-link capacitor in inverter |
| CN105866555A (en) * | 2015-01-09 | 2016-08-17 | 通用电气公司 | Use of voltage probe to measure high voltage amplitude and phase to improve on-line bushing monitoring relevance |
| CN106990304A (en) * | 2017-04-13 | 2017-07-28 | 山东汇能电气有限公司 | Power capacitor running status on-line monitoring method based on capacitance |
| CN107064750A (en) * | 2015-11-25 | 2017-08-18 | 洛克威尔自动控制技术股份有限公司 | The degeneration and correction of filter condenser |
| CN109952503A (en) * | 2016-07-01 | 2019-06-28 | Lg伊诺特有限公司 | For detecting the method and its equipment and system of foreign matter |
-
2018
- 2018-05-31 CN CN201810562292.6A patent/CN110556789B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010160001A (en) * | 2009-01-07 | 2010-07-22 | Fuji Electric Systems Co Ltd | Capacitance calculator and degradation detector of main circuit capacitor |
| CN103444037A (en) * | 2011-03-17 | 2013-12-11 | Abb技术有限公司 | Voltage based method for fault identification in a transmission line and apparatus thereof |
| CN103580497A (en) * | 2012-07-26 | 2014-02-12 | Ls产电株式会社 | Apparatus for estimating capacitance of DC-link capacitor in inverter |
| CN105866555A (en) * | 2015-01-09 | 2016-08-17 | 通用电气公司 | Use of voltage probe to measure high voltage amplitude and phase to improve on-line bushing monitoring relevance |
| CN107064750A (en) * | 2015-11-25 | 2017-08-18 | 洛克威尔自动控制技术股份有限公司 | The degeneration and correction of filter condenser |
| CN109952503A (en) * | 2016-07-01 | 2019-06-28 | Lg伊诺特有限公司 | For detecting the method and its equipment and system of foreign matter |
| CN106990304A (en) * | 2017-04-13 | 2017-07-28 | 山东汇能电气有限公司 | Power capacitor running status on-line monitoring method based on capacitance |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111262462A (en) * | 2020-03-04 | 2020-06-09 | 科华恒盛股份有限公司 | Filter capacitor failure detection method of inverter |
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| CN110556789B (en) | 2021-11-19 |
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