WO2023153048A1 - 電力変換装置 - Google Patents
電力変換装置 Download PDFInfo
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- WO2023153048A1 WO2023153048A1 PCT/JP2022/043682 JP2022043682W WO2023153048A1 WO 2023153048 A1 WO2023153048 A1 WO 2023153048A1 JP 2022043682 W JP2022043682 W JP 2022043682W WO 2023153048 A1 WO2023153048 A1 WO 2023153048A1
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- 238000006243 chemical reaction Methods 0.000 title claims abstract description 36
- 230000005856 abnormality Effects 0.000 claims abstract description 42
- 238000001514 detection method Methods 0.000 claims abstract description 28
- 230000002159 abnormal effect Effects 0.000 claims description 79
- 230000008859 change Effects 0.000 claims description 6
- 238000012544 monitoring process Methods 0.000 description 20
- 239000003990 capacitor Substances 0.000 description 12
- 238000000034 method Methods 0.000 description 12
- 238000010586 diagram Methods 0.000 description 10
- 238000009499 grossing Methods 0.000 description 8
- 230000006870 function Effects 0.000 description 5
- 238000012545 processing Methods 0.000 description 5
- 238000004891 communication Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
Definitions
- the present invention relates to a power converter.
- Patent Document 1 is available as a background technology for power converters.
- the grid-connected inverter device includes an input capacitor, an inverter, a filter circuit including an inductor and an output capacitor, and a control circuit that controls the switching operation of the inverter.
- the control circuit also has an abnormality detection section for detecting an abnormality in the output voltage Vo of the filter circuit. This control circuit, based on the detection result of the abnormality detection unit, controls to discharge the accumulated electric charge of the output capacitor to the input capacitor via the inverter when the isolated operation state disconnected from the power system is detected. is described.
- limit values are not set according to the operation of the customer system, and especially in systems where it is desired to determine an abnormality in one cycle of operation, it is not possible to know in which process in one cycle the abnormal state occurred. There is a problem.
- FIG. 1 is an example of a configuration diagram of a power conversion device in Examples 1 and 2;
- FIG. 7 is a flow chart showing a procedure for preparing for abnormality determination performed by an abnormal operation determination unit in the first and second embodiments; 7 is a flow chart showing an abnormality determination procedure performed by an abnormal operation determination unit in Examples 1 and 2; It is an example of the abnormality determination range in Example 1.
- FIG. 4 is a flow chart performed by an abnormal operation determination unit in Examples 1 and 2;
- FIG. 4 is a flow chart of abnormality determination in Examples 1 and 2.
- FIG. 10 is a diagram showing the frequency of occurrence of abnormal data determined by the abnormal operation determining unit in the first embodiment; It is an example of the abnormality determination range in Example 2.
- FIG. 10 is a diagram showing data acquired by an abnormal operation determination unit in Example 2;
- FIG. 10 is a diagram showing data stored in a memory/calculation unit in Example 2;
- FIG. 10 is a diagram showing the frequency of occurrence of abnormal data determined by an abnormal operation determining unit in the second embodiment;
- FIG. 1 is an example of a configuration diagram of the power conversion device of this embodiment, an AC motor 105, and a system 109 connected to the motor as a device to be operated.
- a three-phase AC power supply 101 a DC converter 102, a smoothing capacitor 103, an AC converter 104, a display/operation unit 106, an input-side voltage detector 111, a diode temperature detector 112, and a DC voltage detector 113 , output voltage detector 1141, inverter unit temperature detector 1142, current detector 1151, motor temperature detector 1152, speed detector 1153, external signal detector 119, input voltage detector 121, diode temperature detector 122, DC Voltage detector 123, output voltage detector 1241, inverter temperature detector 1242, current detector 1251, motor temperature detector 1252, speed detector 1253, external signal detector 129, calculator 130, output controller 131, abnormal operation It has a determination unit 132 and a storage/calculation unit 133 .
- the three-phase AC power supply 101 is, for example, a three-phase AC voltage supplied from a power company or an AC voltage supplied from a generator, and outputs to the DC conversion unit 102 .
- the DC conversion unit 102 is configured by, for example, a DC conversion circuit configured with a diode or a DC conversion circuit using an IGBT and a flywheel diode, and converts the AC voltage input from the three-phase AC power supply 101 into a DC voltage, Output to smoothing capacitor 103 .
- FIG. 1 shows a DC conversion section configured with a diode.
- the smoothing capacitor 103 smoothes the DC voltage input from the DC converter 102 and outputs the DC voltage to the AC converter 104 .
- the smoothing capacitor 103 may receive the DC voltage directly from the generator without going through the DC converter 102 .
- the AC conversion unit 104 is composed of, for example, an AC conversion circuit using an IGBT and a flywheel diode, receives the DC voltage of the smoothing capacitor 103 and the output command of the output control unit 131, converts the DC voltage into an AC voltage, Output to AC motor 105 .
- the display/operation unit 106 represents a user interface such as an operation panel or an input/output terminal, and outputs information operated by the user or a signal obtained from an external device to the storage/operation unit 133, for example.
- the display/operation unit 106 determines The obtained information is output to the storage/calculation unit 133 .
- the display/operation unit 106 is a display device that can display numerical values attached to the power conversion device, or a communication terminal such as a smart phone that is placed outside, and stores data stored in the storage/calculation unit 133. Display as monitor data.
- the input-side voltage detector 111 receives the output of the three-phase AC power supply 101, converts the voltage level through, for example, a voltage dividing circuit, and outputs it to the input voltage detector 121 composed of an AD converter and a microcomputer.
- the diode unit temperature detector 112 is composed of, for example, a temperature thermistor, converts the temperature of the DC converter 102 into an electric signal, and outputs the electric signal to the diode temperature detector 122 .
- the DC voltage detector 113 receives the DC voltage of the smoothing capacitor 103, converts the voltage level through, for example, a voltage dividing circuit, and outputs it to the DC voltage detection unit 123 composed of an AD converter and a microcomputer.
- the output-side voltage detector 1141 receives the output of the AC converter 104, converts the voltage level through, for example, a voltage dividing circuit, and outputs it to the output voltage detector 1241 composed of an AD converter and a microcomputer.
- the inverter unit temperature detector 1142 is composed of, for example, a temperature thermistor, converts the temperature of the AC conversion unit 104 into an electric signal, and outputs the electric signal to the inverter temperature detection unit 1242 .
- the current detector 1151 is, for example, a Hall CT or a shunt resistor, converts the input current into an electrical signal, and outputs the electrical signal to the current detection section 1251 .
- the motor temperature detector 1152 is composed of, for example, a temperature thermistor, converts the temperature of the AC motor 105 into an electric signal, and outputs the electric signal to the electric motor temperature detector 1252 .
- the speed detector 1153 is composed of, for example, a rotary encoder, detects the direct rotation speed of the AC motor 105 or the rotation speed changed by attaching a gear, etc., and outputs it to the speed detection unit 1253 .
- the external signal detector 119 is composed of, for example, a temperature sensor, a vibration sensor, and a voice sensor.
- the external signal detector 119 is a sensor capable of extracting the operation of the system 109 as an electric signal, converts the sensor information into an electric signal, and outputs the electric signal to the external signal detector 129 .
- Input voltage detector 121, diode temperature detector 122, DC voltage detector 123, output voltage detector 1241, inverter temperature detector 1242, current detector 1251, motor temperature detector 1252, speed detector 1253, external signal detector 129 are each composed of, for example, an AD converter and a communication module.
- the detection unit 129 converts each acquired electrical signal into digital data. The converted digital data is output to the storage/calculation section 133 from each processing section described above.
- the computing unit 130 is, for example, a microcomputer, and is a device that converts or computes data. Even if the arithmetic unit 130 is composed of a plurality of elements, the intention does not change.
- Operation unit 130 includes input voltage detection unit 121 , diode temperature detection unit 122 , DC voltage detection unit 123 , output voltage detection unit 1241 , inverter temperature detection unit 1242 , current detection unit 1251 , motor temperature detection unit 1252 , speed detection unit 1253 . , an external signal detection unit 129 , an output control unit 131 , an abnormal operation determination unit 132 , and a storage/calculation unit 133 .
- the output control unit 131 is a control unit that calculates a command signal for driving the system 109 , provides an output command signal to the AC conversion unit 104 , and outputs output command data to the abnormal operation determination unit 132 .
- the abnormal operation determination unit 132 uses the output command data of the output control unit 131 and the data acquired from the sensor stored in the storage/calculation unit 133 as monitor data, and receives preset abnormality determination data as input, and uses various data as monitor data. is selectively used to determine if the signal is abnormal.
- the storage/calculation unit 133 accumulates data acquired from various data acquisition units and outputs the data to the abnormal operation determination unit 132 .
- the power conversion device in FIG. 1 includes a DC conversion unit 102, a smoothing capacitor 103, an AC conversion unit 104, a display/operation unit 106, an input side voltage detector 111, a diode temperature detector 112, a DC voltage detector 113, and an output side.
- a voltage detector 1141 , an inverter part temperature detector 1142 , a current detector 1151 and a calculation part 130 are provided.
- the output-side voltage detector 1141, the inverter temperature detector 1142, and the current detector 1151 may be attached outside the power converter.
- FIG. 2 is a flowchart showing a preparation procedure for abnormality monitoring performed by the abnormal operation determination unit 132 according to the first embodiment.
- the abnormal operation determination unit 132 acquires range specification information set in advance in the storage/calculation unit 133 through the display/operation unit 106 and information on what to monitor (S201).
- the abnormal operation determination unit 132 sets the monitoring range from the acquired information (S202).
- the abnormal operation determination unit 132 sets determination means for performing abnormality determination (S203). For example, when the frequency per unit time of reaching the range of abnormality determination exceeds a certain level, it is set to notify the outside as an abnormal state.
- an operation suitable for the system 109 is realized by setting a judgment means for detecting an abnormality so as to detect only an outlier and issue an error after one cycle.
- one cycle represents the period from when the system 109 starts a specific work to when it ends.
- the cycle may be one in which molding is performed and the product is extruded.
- the abnormal operation determination unit 132 shifts to a standby state in which it waits for a trigger for monitoring the target data (S204).
- FIG. 3 is a flowchart showing an abnormality monitoring determination procedure performed by the abnormal operation determination unit 132 in the first embodiment.
- the abnormal operation determination unit 132 holds the collected data in the storage/calculation unit 133 and transmits the data to the outside through the display/operation unit 106 (S304). As described above, a method of monitoring data by a judgment method specified in advance has been shown.
- FIG. 4 shows an example of how the abnormal operation determination unit 132 recognizes the abnormal range as data.
- the horizontal axis indicates the output frequency command (Hz) of the power converter
- the vertical axis indicates the output current value (A) of the power converter and monitor information data from the system 109 .
- (1A) on the horizontal axis in FIG. 4 indicates a specific value of the output frequency.
- (1AU) on the vertical axis represents the maximum output current value when the output frequency is (1A) among the samples of monitored data
- (1AL) represents the maximum output current value when the output frequency is (1A) among the samples of monitored data.
- 1A) represents the minimum output current value.
- Other (2AU) and (2AL) mean values of similar relationships.
- the abnormal operation determination unit 132 acquires the corresponding monitor information data from the steady driving conditions.
- Abnormal operation determination unit 132 determines that a state in which the output current is higher than upper limit value 41 (the region indicated by the upper arrow) is a state in which the upper limit has passed, and a state in which the output current is lower than lower limit value 42 (the region indicated by the lower arrow). The abnormal operation determination unit 132 determines that the region indicated by ) is in a state of less than the lower limit.
- the abnormal operation determination unit 132 makes an abnormal determination such that the weight of the degree of abnormality is increased as the distance from the area determined as normal increases, and the degree of abnormality is increased as the distance from the area increases even if the frequency is low, and the abnormality is determined to be abnormal. good too.
- the abnormal operation determination unit 132 reads the operation of the system 109 specified by the customer in advance, and controls the system 109 according to a pattern to be monitored (for example, controlling the output frequency of the power converter according to the customer's request) (S502). ).
- the abnormal operation determination unit 132 repeatedly acquires normal pattern information while controlling the system 109 (S503).
- the abnormal operation determination unit 132 continues to hold the collected data in the storage/calculation unit 133 .
- the amount of monitoring data that can determine an abnormality for example, there is a case where 100 items are obtained for each predetermined point.
- the output frequency of the power conversion device is converted to a predetermined upper and lower range, and the output current according to the change is measured to obtain a sufficient amount as monitoring data. Operation ends. Alternatively, when the end is specified through the display/operation unit 106, the automatic learning is ended and the monitoring basic data operation is ended (S504).
- FIG. 6 shows data information plotted by the abnormal operation determination unit 132 as the operation range during automatic learning.
- the vertical axis indicates the output frequency of the power converter
- the horizontal axis indicates the time in automatic learning.
- the output frequency (1A) and the like correspond to the values on the horizontal axis in FIG.
- the vertical axis indicates the output current value of the power converter
- the horizontal axis indicates the time in automatic learning.
- I1 indicates the output current value when the output frequency is (1B).
- data from the speed detection unit 1253 may be used, or an output frequency command value calculated by the output control unit 131 may be used.
- Data from the current detector 1251 is used for the output current value.
- FIG. 7 is a diagram expressing the plotted information as two-dimensional information, and shows that the operation of the power converter is within the normal range as a result of operation.
- the vertical axis in FIG. 7 indicates the output current (A), and the horizontal axis indicates the output frequency (Hz).
- the abnormal operation determination unit 132 may set the reference value 40 in FIG. 4 by calculating the average output current for each output frequency from the data in the graph of FIG. Alternatively, the reference value may be determined in advance according to the customer's request. Abnormal operation determination section 132 calculates upper limit value 41 and lower limit value 42 from the set reference value and likelihood.
- the abnormal operation determination unit 132 adjusts the upper limit value 41 and the lower limit value shown in FIG. 7 and FIG. A threshold such as a value of 42 is set, and the normal range is defined as definite information.
- FIG. 8 is a flowchart showing an abnormality determination procedure performed by the abnormal operation determination unit 132 according to the first embodiment.
- the abnormal operation determination unit 132 acquires monitoring target data (S801).
- the frequency of the data exceeding the upper limit value 41 per unit time is defined as the abnormal operation.
- the determination unit 132 calculates. For example, it is possible to calculate the number of monitoring target data exceeding the upper limit value 41 per unit time as the frequency. In FIG. 9, the number of individual circles indicates the number of data to be monitored, and the number of cases exceeding the upper limit value 41 per unit time is defined as the frequency.
- the abnormal operation determination unit 132 calculates the frequency of the monitoring target data less than the lower limit value 42 per unit time. (S802).
- the abnormal operation determination unit 132 compares the frequency calculated in S802 with the predetermined frequency, and determines whether the frequency is equal to or higher than the predetermined frequency (S803). If the frequency calculated in S802 is equal to or higher than the predetermined frequency (Yes in S803), an alarm is issued as an abnormality (S804). If the frequency calculated in S802 is less than the predetermined frequency (No in S803), the processing of the abnormality determination procedure ends.
- Embodiment 2 is a modification of Embodiment 1, and the configuration of Embodiment 2 has the same functions as the configuration denoted by the same reference numerals shown in FIG. Description is omitted.
- the target is a system in which the system 109 connected to the electric motor repeats one specific cycle.
- an operation is performed in which a specific pattern is taken as monitor information in the passage of time in a constant cycle.
- FIG. 10 shows an example of how the abnormal operation determination unit 132 recognizes the abnormal range as data.
- the horizontal axis represents the elapsed time (s), and the vertical axis represents the output current value (A) and monitor information data.
- the corresponding monitor information data is acquired from the periodic drive conditions.
- the abnormal operation determination unit 132 sets the reference value 40, the upper limit value 41, and the lower limit value 42, as described in the first embodiment.
- Abnormal operation determination unit 132 determines that a state in which the output current is higher than upper limit value 41 (the region indicated by the upper arrow) is a state in which the upper limit has passed, and a state in which the output current is lower than lower limit value 42 (the region indicated by the lower arrow). The abnormal operation determination unit 132 determines that the region indicated by ) is in a state of less than the lower limit.
- an area to be judged as normal is set for a preset basic two-dimensional plane point (reference value 40).
- the region judged to be normal is the region between the upper limit value 41 and the lower limit value 42 .
- the abnormal operation determination unit 132 determines that the abnormal operation is abnormal. to judge.
- the abnormal operation judgment unit 132 When one cycle of operation is monitored, the abnormal operation judgment unit 132 does not stop the operation, but stores the location judged to be abnormal in the storage/calculation unit 133, and after one cycle of operation is completed, the operation is monitored.
- the display/operation unit 106 informs the outside whether the operation has been completed normally. In the case of FIG. 13, it is possible to inform the outside that an abnormality has occurred between times (2F) and (2G).
- each of the above configurations, functions, processing units, processing means, etc. may be realized in hardware, for example, by designing a part or all of them with an integrated circuit.
- each of the above configurations, functions, etc. may be realized by software by a processor interpreting and executing a program for realizing each function.
- Information such as programs, tables, and files that implement each function can be stored in recording devices such as memory, hard disks, SSDs (Solid State Drives), or recording media such as IC cards, SD cards, and DVDs.
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Abstract
Description
前記制御部が、前記上限値を超えた状態の頻度もしくは前記下限値未満の状態の頻度を算出し、前記頻度と定めておいた所定頻度を比較して、異常であるかを判断する電力変換装置である。
Claims (10)
- 直流電圧を被動作機器に対応した交流電圧に変換する電力変換部と、
前記電力変換部から出力される出力電流を検出する電流検出部と、
前記電流検出部で検出した出力電流の基準値、または前記被動作機器からのモニタ対象値の基準値と、前記基準値から決まる上限値および下限値を記憶する記憶部と、
前記電力変換部を制御する制御部とを備え、
前記制御部が、
前記上限値を超えた状態の頻度もしくは前記下限値未満の状態の頻度を算出し、
前記頻度と定めておいた所定頻度を比較して、異常であるかを判断する電力変換装置。 - 請求項1に記載の電力変換装置において、
前記上限値もしくは前記下限値は、前記基準値から所定幅を持たせた値である電力変換装置。 - 請求項1に記載の電力変換装置において、
前記制御部は、
特定の周波数の出力電流値を取得し、前記出力電流値の平均を前記基準値とする電力変換装置。 - 請求項1に記載の電力変換装置において、
前記記憶部は、
前記出力電流値、もしくは前記モニタ対象値を蓄積し、
前記制御部が、
前記基準値により変化する前記上限値および前記下限値を演算し、
前記上限値及び前記下限値として設定する電力変換装置。 - 請求項1に記載の電力変換装置において、
前記制御部が、
異常と判断した場合には、外部に通知をするとともに、電力変換装置を停止させるように制御をする電力変換装置。 - 請求項1に記載の電力変換装置において、
前記制御部が、
異常と判断した場合には、1サイクルの動作を終了した後に、外部に通知をする電力変換装置。 - 請求項1に記載の電力変換装置において、
前記制御部が、
あらかじめ定められた前記所定頻度の割合で前記出力電流または前記モニタ対象値が出現するように、前記上限値または下限値を設定しておく電力変換装置。 - 請求項1に記載の電力変換装置において、
前記制御部は、
前記出力電流が、前記基準値から離れるほど、前記頻度を高くするように演算をする、もしくは、前記モニタ対象値が、前記基準値から離れるほど、前記頻度を高くするように演算をする電力変換装置。 - 請求項1に記載の電力変換装置において、
前記制御部は、
異常と判断したタイミングを、前記記憶部に記憶する電力変換装置。 - 請求項1に記載の電力変換装置において、
前記被動作機器は、電動機に連結される機器であり、
前記制御部が、
前記被動作機器の状態を検出する外部信号検出器から、モニタ対象値を取得する電力変換装置。
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JP6380628B1 (ja) * | 2017-07-31 | 2018-08-29 | 株式会社安川電機 | 電力変換装置、サーバ、及びデータ生成方法 |
WO2019230191A1 (ja) * | 2018-05-31 | 2019-12-05 | 株式会社日立製作所 | 風力発電システム |
JP2020010567A (ja) | 2018-07-12 | 2020-01-16 | 新電元工業株式会社 | 系統連系インバータ装置 |
JP2020137145A (ja) * | 2019-02-12 | 2020-08-31 | 富士電機株式会社 | 異常要因特定方法、異常要因特定装置、電力変換装置及び電力変換システム |
JP2021114895A (ja) * | 2020-01-16 | 2021-08-05 | 株式会社日立産機システム | 電力変換装置、回転機システム、及び診断方法 |
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JP6380628B1 (ja) * | 2017-07-31 | 2018-08-29 | 株式会社安川電機 | 電力変換装置、サーバ、及びデータ生成方法 |
WO2019230191A1 (ja) * | 2018-05-31 | 2019-12-05 | 株式会社日立製作所 | 風力発電システム |
JP2020010567A (ja) | 2018-07-12 | 2020-01-16 | 新電元工業株式会社 | 系統連系インバータ装置 |
JP2020137145A (ja) * | 2019-02-12 | 2020-08-31 | 富士電機株式会社 | 異常要因特定方法、異常要因特定装置、電力変換装置及び電力変換システム |
JP2021114895A (ja) * | 2020-01-16 | 2021-08-05 | 株式会社日立産機システム | 電力変換装置、回転機システム、及び診断方法 |
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