EP4483485A1 - Überwachung eines synchronmotors - Google Patents
Überwachung eines synchronmotorsInfo
- Publication number
- EP4483485A1 EP4483485A1 EP23719730.6A EP23719730A EP4483485A1 EP 4483485 A1 EP4483485 A1 EP 4483485A1 EP 23719730 A EP23719730 A EP 23719730A EP 4483485 A1 EP4483485 A1 EP 4483485A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- monitoring
- synchronous motor
- value
- individual values
- power factor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
- H02P29/02—Providing protection against overload without automatic interruption of supply
- H02P29/024—Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
- H02P25/02—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the kind of motor
- H02P25/022—Synchronous motors
Definitions
- the invention relates to a method or a device for monitoring a synchronous machine, in particular a method or a device for monitoring an excitation device of a synchronous machine.
- the invention relates to a method for detecting a faulty excitation device in a synchronous motor in the mains or. Inverter operation, whereby mains operation is also referred to as DOL operation (direct switching on to the mains).
- Synchronous machines are electrical machines that can be used as a synchronous motor or as a synchronous generator. Synchronous machines can be self-excited or externally excited. Externally excited synchronous machines have an excitation device. Self-excited synchronous machines in particular have permanent magnets for excitation. When operating the synchronous machine, attention must be paid to the power factor.
- the power factor also called active power factor
- the effective factor is defined from the ratio of active power P to apparent power S. This is also known as coscp.
- the power factors can be adjusted or adjusted by the excitation device. be set.
- a power factor with a value of 1 can be assumed, as this is the optimal value from the perspective of losses and torque provision.
- the motor can also be operated at other operating points; this must be taken into account in the algorithm (variable or static setpoint specification of the power factor). It is often not possible to optimally adjust the excitation circuit during the commissioning phase because not all points can be reached in test operation. A non-optimal setting is not immediately problematic for the operator if the per- formance is sufficient in terms of torque.
- the pathogen control circuit can, under certain circumstances, be seen as secondary. A faulty or incorrectly parameterized excitation device or defective excitation device leads in particular to anomalies in the power factor.
- One object of the invention is to eliminate an error, an anomaly or to detect a defect.
- the error(s) relate in particular to a faulty and/or incorrectly parameterized excitation device and/or a defective excitation device.
- the task particularly concerns a synchronous motor.
- a solution to the problem results from a method according to claim 1, a monitoring device according to claim 11 or. a computer program product according to claim 12.
- a power factor of the synchronous machine or The individual value dependent on the synchronous motor is measured, with a monitoring value being formed from a large number of individual values and/or values dependent thereon.
- the individual value is, for example, the power factor itself.
- the individual value can also be formed from a large number of individual values.
- the power factor is not monitored from one network period to the next, but rather over longer periods of minutes, hours, days, weeks or months. This makes it possible to automatically identify anomalies during long-term operation, for example of a synchronous motor with an excitation device.
- a status "normal” or “abnormal” that indicates the current health status of the pathogen facility describes can be made available in this way.
- the potential for saving losses alone is in the range of 50,000kWh per year for larger engines. There is considerable savings potential over the life cycle.
- Monitoring is carried out particularly in synchronous machines with a higher output of several hundred kilowatts or a few megawatts.
- the monitoring value is in particular a difference between a target value for the power factor and the determined power factor or not of that either.
- the determined power factor is an example of a single value.
- individual values are used to form, for example by calculation, the monitoring value, i.e. in particular a large number of individual values are used, which are determined in a static operating state of the synchronous motor, or. have been determined.
- a static operating state of the synchronous motor is, for example, an operating state in which the speed, in particular the target speed, of the synchronous motor changes only slightly.
- a slight change in speed occurs, for example, if the revolutions change by less than 10 revolutions/min within 1 minute.
- Another example of a minor change in speed is when the speed changes by less than 1 percent within 1 minute.
- individual values are excluded which are determined in a dynamic operating state of the synchronous motor. have been determined.
- a dynamic operating state is, for example, the start-up of the electric motor or the standstill. Settlement of the synchronous motor.
- a dynamic operating state of the synchronous motor occurs, for example, when the speed of the synchronous motor changes by more than 10 revolutions/min within 1 minute. Another example of a dynamic operating condition is a speed change of more than 1 percent within 1 minute.
- the use of the synchronous motor is particularly characterized by the fact that different target speeds and/or different loads are provided during operation.
- the synchronous motor has different target speeds during operation.
- the method can be used to monitor how the power factor develops over time at different target speeds in static operating states.
- a synchronous motor must in particular be kept in an energetically optimal operating condition.
- the power factor must be monitored.
- optimal energy utilization occurs with a coscp equal to 1.
- the large number of individual values are taken from a period of time, which in particular can be freely determined, the period of time in particular having a length of at least one minute or has a length of minutes to months.
- the time interval between the individual values used within the period can, for example, be one or more seconds (in particular greater than one second) or be one or more minutes (in particular greater than one minute).
- the distance is in particular special adjustable.
- the interval is, for example, 10 seconds to 120 seconds). In particular, only individual values that were determined during stationary operation of the synchronous machine or synchronous motor are considered.
- the monitoring value formed is weighted according to time.
- individual values are used depending on the operating state of the synchronous machine or synchronous motor. Performance factors are therefore not taken into account in particular if they were determined, for example, when the synchronous machine or synchronous motor was running up. Performance factors are taken into account in particular if they were determined in a stationary state of the synchronous machine or synchronous motor.
- an anomaly is detected by the monitoring value, the anomaly particularly affecting the excitation device.
- the anomaly particularly affecting the excitation device.
- a defective excitation device can be detected.
- the speed of the synchronous machine or of the synchronous motor is taken into account.
- the power factor can be multiplied by the sign of the engine speed. This means that monitoring is independent of the speed.
- the power factor of the synchronous motor is improved after the anomaly has been detected. This is achieved, for example, by optimizing the control of the excitation device or by replacing or repairing a component, such as a defective power semiconductor valve or a control module, etc. In one embodiment, a coscp of 1 is achieved again through the optimization.
- a monitoring device for a synchronous machine or a synchronous motor is or is in particular for monitoring an excitation device of the synchronous machine or of the synchronous motor
- the monitoring device in a unit of a power converter or in a structural unit of a regulation and/or control of the synchronous machine or. of the synchronous motor, whereby the monitoring device can be used to carry out one of the methods described.
- the structural unit of the power converter is, for example, a control cabinet or a housing.
- the structural unit of the regulation and/or control is, for example, a housing or a circuit board.
- a computer program product has programming for carrying out one of the methods described, the computer program product being able to run in particular on the monitoring device.
- the current power factor is multiplied by the sign of the engine speed. This guarantees that negative performance factors are not incorrectly identified as faulty. Compared to the previous problem solution, additional measured values are considered here, which reduces the “false positive” rate (“false positive” rate: points in time that are incorrectly classified as abnormal and thus unnecessarily demand attention).
- Detect an anomaly via a total error sum If the error sum exceeds a value, the time is classified as abnormal. Individual measurement errors are not classified as abnormal. Instead, the errors are summed up and an anomaly is only detected when a limit is exceeded. The procedure ensures the reduction of the false positive rate. Only when a cluster of unexpected performance factors emerge is an anomaly detected. In addition, larger deviations are more significant, since the sum of errors increases more quickly with larger deviations.
- the sum of errors is limited to a maximum. This ensures that it does not become too large and that replacement of the defective excitation device is determined promptly.
- the forgetting factor reduces the amount of errors during normal operation, which means that the status is automatically set to normal after sufficiently normal measured values.
- An advantage of the invention can, for example, be that after an excitation device has been repaired, the repair does not have to be entered manually. After a certain amount of time, the algorithm automatically recognizes the change based on the data.
- the described embodiments result in automated monitoring of the power factor.
- a context-related error sum e.g. through the exclusive use of values in stationary operation
- outliers in particular are ignored, accumulations are recognized and changes are determined dynamically.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Ac Motors In General (AREA)
- Control Of Electric Motors In General (AREA)
- Testing And Monitoring For Control Systems (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP22176168.7A EP4287499A1 (de) | 2022-05-30 | 2022-05-30 | Überwachung einer synchronmaschine |
| PCT/EP2023/059739 WO2023232336A1 (de) | 2022-05-30 | 2023-04-14 | Überwachung eines synchronmotors |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4483485A1 true EP4483485A1 (de) | 2025-01-01 |
Family
ID=81851613
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP22176168.7A Withdrawn EP4287499A1 (de) | 2022-05-30 | 2022-05-30 | Überwachung einer synchronmaschine |
| EP23719730.6A Pending EP4483485A1 (de) | 2022-05-30 | 2023-04-14 | Überwachung eines synchronmotors |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP22176168.7A Withdrawn EP4287499A1 (de) | 2022-05-30 | 2022-05-30 | Überwachung einer synchronmaschine |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US20250330109A1 (de) |
| EP (2) | EP4287499A1 (de) |
| CN (1) | CN119301866A (de) |
| WO (1) | WO2023232336A1 (de) |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6529135B1 (en) * | 1999-10-12 | 2003-03-04 | Csi Technology, Inc. | Integrated electric motor monitor |
| US7933101B2 (en) * | 2007-02-15 | 2011-04-26 | Aka Information Design | Generator power plant protection system and method |
| US9430012B2 (en) * | 2012-12-11 | 2016-08-30 | General Electric Company | Systems and methods of transformer failure detection and control |
-
2022
- 2022-05-30 EP EP22176168.7A patent/EP4287499A1/de not_active Withdrawn
-
2023
- 2023-04-14 WO PCT/EP2023/059739 patent/WO2023232336A1/de not_active Ceased
- 2023-04-14 CN CN202380043395.0A patent/CN119301866A/zh active Pending
- 2023-04-14 US US18/870,582 patent/US20250330109A1/en active Pending
- 2023-04-14 EP EP23719730.6A patent/EP4483485A1/de active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| US20250330109A1 (en) | 2025-10-23 |
| WO2023232336A1 (de) | 2023-12-07 |
| CN119301866A (zh) | 2025-01-10 |
| EP4287499A1 (de) | 2023-12-06 |
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Legal Events
| Date | Code | Title | Description |
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