CN113992114A - Low-voltage ride-through emergency control system and method for high-voltage frequency converter master controller - Google Patents
Low-voltage ride-through emergency control system and method for high-voltage frequency converter master controller Download PDFInfo
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- CN113992114A CN113992114A CN202111330792.5A CN202111330792A CN113992114A CN 113992114 A CN113992114 A CN 113992114A CN 202111330792 A CN202111330792 A CN 202111330792A CN 113992114 A CN113992114 A CN 113992114A
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- 238000001514 detection method Methods 0.000 claims abstract description 32
- 238000006243 chemical reaction Methods 0.000 claims description 15
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- 238000011084 recovery Methods 0.000 claims description 6
- 230000009471 action Effects 0.000 claims description 5
- 230000003139 buffering effect Effects 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000001052 transient effect Effects 0.000 description 2
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- 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
- H02P29/028—Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load the motor continuing operation despite the fault condition, e.g. eliminating, compensating for or remedying the fault
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
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- 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
- H02P29/032—Preventing damage to the motor, e.g. setting individual current limits for different drive conditions
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Abstract
The invention relates to the technical field of a master control machine of a high-voltage frequency converter, and discloses a low-voltage ride-through emergency control system and a method for the master control machine of the high-voltage frequency converter, wherein the system comprises a frequency converter and a high-voltage detection device; when the frequency converter is in a high-voltage operation state, the high-voltage detection device continuously performs high-voltage detection on equipment and provides a feedback signal for the low-voltage ride-through emergency control system, and when the high-voltage detection device detects that voltage drops, the low-voltage ride-through emergency control system can automatically perform judgment processing according to a low-voltage ride-through range set in advance. The invention solves the problems of non-uniform crossing areas of low voltage crossing, voltage drop in different degrees, difference between low voltage crossing areas specified by different grid-connected standards, how to accurately and effectively judge the areas and how to accurately judge the low voltage crossing areas by the difficulty of judging the low voltage crossing areas by arranging the frequency converter and the high voltage detection device, and more auxiliary equipment and longer crossing time needed by low voltage crossing products on the market.
Description
Technical Field
The invention relates to the field of high-voltage frequency converter master controllers, in particular to a low-voltage ride-through emergency control system and method for a high-voltage frequency converter master controller.
Background
When the voltage of a power supply inlet line is reduced to a specified low-voltage crossing area in a transient state, a dynamic state or a long time caused by external faults or disturbance of a frequency converter and power supply object equipment, power can be reliably supplied, and the safe operation of a power supply object is guaranteed. Currently, the low voltage ride through regions specified by international grid-connected standards are not uniform, but the low voltage ride through regions have approximately the same shape and are polygonal regions related to voltage amplitude and time. For voltage drops of different degrees, the low voltage ride through time is different, and how to accurately and effectively judge the area is very complicated. And the low voltage ride through regions specified by different grid-connected standards are different, so that the difficulty in judging the low voltage ride through regions is increased.
The high-voltage frequency converter has been widely applied to three-phase asynchronous motors due to its superior speed-adjusting performance and energy-saving effect. The N + level series multi-level medium and high voltage frequency converter has the characteristics of mature technology, low harmonic wave on the power grid side and the motor side, high power factor and lower price, so that the high-capacity motor generally adopts the cascade multi-level medium and high voltage frequency converter to regulate the speed. The related standard of the high-voltage frequency converter requires that the frequency converter has low-voltage ride-through capability, namely, when the voltage of a transient, dynamic or long-time power supply inlet line caused by external faults or disturbance of a frequency converter power supply and power supply object equipment is reduced to a specified low-voltage ride-through area, the frequency converter can still reliably supply power to ensure the safe operation of the power supply object, but at present, low-voltage ride-through products on the market need more auxiliary equipment and have longer ride-through time.
Disclosure of Invention
The invention aims to provide a low-voltage ride-through emergency control system and a low-voltage ride-through emergency control method for a master controller of a high-voltage frequency converter, which solve the problems in the background art.
In order to achieve the purpose, the invention provides the following technical scheme: a low voltage ride through emergency control system for a high voltage frequency converter master controller comprises a frequency converter and a high voltage detection device;
when the frequency converter is in a high-voltage operation state, the high-voltage detection device continuously performs high-voltage detection on equipment and provides a feedback signal for the low-voltage ride-through emergency control system, and when the high-voltage detection device detects that voltage drops, the low-voltage ride-through emergency control system can automatically perform judgment processing according to a low-voltage ride-through range set in advance. The frequency converter stops outputting, the rectification stops, and the equipment enters a standby state. At the moment, the low-voltage ride-through emergency control system judges whether the power grid voltage and the unit bus voltage are recovered or not according to the feedback signal of the high-voltage detection device within a set time limit, if the power grid voltage is recovered, the rectification is restarted, the equipment enters a ready state and automatically starts the airplane to recover to a normal working condition of equipment operation; and if the voltage of the power grid exceeds the set time limit and is not recovered, the equipment executes a high-voltage drop protection action and stops.
As a preferred embodiment of the present invention, the low voltage passing region ranges from a first low voltage passing region when the input voltage falls within 10% of the rated voltage of the device; when the input voltage drops to 10% -40% of the rated voltage of the equipment, the low-voltage crossing area in the second stage is formed; this range is the third stage low voltage pass-through when the input voltage drops above 40% of the rated voltage of the device.
As a preferred embodiment of the present invention, a low voltage ride through emergency control system for a high voltage inverter master controller, which utilizes the low voltage ride through emergency control system for the high voltage inverter master controller, and the low voltage ride through emergency control method for the high voltage inverter master controller comprises the following steps:
the method comprises the following steps: the high voltage is recovered after instantaneous power failure, the frequency converter can be automatically started, and the time is related to specific loads through kinetic energy buffering. When the input voltage of the frequency conversion device is within 10 percent of 10kV, the motor can continuously and normally work at rated load;
step two: the output voltage of the frequency conversion device basically keeps 10kV unchanged; when the input 10kV suddenly drops by 10% -40%, the equipment automatically performs capacity reduction operation according to the current input voltage, and when the 10kV input voltage is recovered to 10%, the frequency converter automatically recovers to the working condition before capacity reduction; when the input 10KV suddenly drops to below 60% or the power grid is flashed for 3S, the power supply is restored: the frequency conversion device can automatically recover to the operation condition before power failure. And continuous operation of the equipment under the condition of power grid flicker is realized.
In a preferred embodiment of the present invention, the low voltage ride through region is set according to an operation specification of the high voltage inverter in an initialization program of the controller.
As a preferred embodiment of the present invention, the low voltage ride through region determination is performed in a master controller of the high voltage frequency converter, and the power grid voltage is continuously detected.
In a preferred embodiment of the present invention, the grid voltage needs to be continuously detected, and the dynamic detection feedback signal determines the range and duration of the low voltage ride through.
As a preferred embodiment of the present invention, the grid-connected point voltage input value needs to be determined by the control machine of the high-voltage inverter each time: if the system is in the normal range, the system is normally operated in a grid-connected mode; if the voltage is lower than the normal operation voltage, the system is in a low voltage ride through region.
As a preferred embodiment of the present invention, the grid-connected input voltage counting variable needs to be determined: when the system is in a low voltage ride through range, the system is in a low voltage ride through region, low voltage control is required, and the reactive power is generated to support the rapid recovery of the grid voltage; when the voltage drops to the low voltage crossing range of the third section and exceeds the set time limit value, the high-voltage frequency conversion device can be stopped and disconnected.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the invention, when the frequency converter is in a high-voltage operation state, the high-voltage detection device continuously performs high-voltage detection on equipment and provides a feedback signal for the low-voltage ride-through emergency control system, and when the high-voltage detection device detects that the voltage drops, the low-voltage ride-through emergency control system can automatically perform judgment processing according to the low-voltage ride-through range set in advance. The frequency converter stops outputting, the rectification stops, and the equipment enters a standby state. At the moment, the low-voltage ride-through emergency control system judges whether the power grid voltage and the unit bus voltage are recovered or not according to the feedback signal of the high-voltage detection device within a set time limit, if the power grid voltage is recovered, the rectification is restarted, the equipment enters a ready state and automatically starts the airplane to recover to a normal working condition of equipment operation; if the voltage of the power grid exceeds the set time limit and is not recovered, the equipment executes high-voltage drop protection action and stops, and the problems that the passing areas of low-voltage passing through are not uniform, the voltage drops of different degrees exist, the difference exists between the low-voltage passing through areas specified by different grid-connected standards, how to accurately and effectively judge the areas and the low-voltage passing through products in the market needs more auxiliary equipment, and the passing time is longer are solved.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
fig. 1 is a schematic view of an interaction process of a low-voltage crossing emergency control system for a master controller of a high-voltage frequency converter according to the present invention;
fig. 2 is a waveform schematic diagram of a low voltage ride through emergency control system for a master controller of a high voltage inverter according to the present invention;
fig. 3 is a schematic diagram of an operation state of a low voltage ride through emergency control system and method for a master controller of a high voltage inverter according to the present invention.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the present invention; in the description of the present invention, it should be noted that unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "disposed" are to be construed broadly and can, for example, be fixedly connected, disposed, detachably connected, disposed, or integrally connected and disposed. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring to fig. 1-3, the present invention provides a technical solution: a low voltage ride through emergency control system for a high voltage frequency converter master controller comprises a frequency converter and a high voltage detection device;
when the frequency converter is in a high-voltage operation state, the high-voltage detection device continuously performs high-voltage detection on equipment and provides a feedback signal for the low-voltage ride-through emergency control system, and when the high-voltage detection device detects that voltage drops, the low-voltage ride-through emergency control system can automatically perform judgment processing according to a low-voltage ride-through range set in advance. The frequency converter stops outputting, the rectification stops, and the equipment enters a standby state. At the moment, the low-voltage ride-through emergency control system judges whether the power grid voltage and the unit bus voltage are recovered or not according to the feedback signal of the high-voltage detection device within a set time limit, if the power grid voltage is recovered, the rectification is restarted, the equipment enters a ready state and automatically starts the airplane to recover to a normal working condition of equipment operation; and if the voltage of the power grid exceeds the set time limit and is not recovered, the equipment executes a high-voltage drop protection action and stops.
Referring to fig. 1, the low voltage crossing region is a first low voltage crossing region when the input voltage falls within 10% of the rated voltage of the device; when the input voltage drops to 10% -40% of the rated voltage of the equipment, the low-voltage crossing area in the second stage is formed; this range is the third stage low voltage pass-through when the input voltage drops above 40% of the rated voltage of the device.
As a preferred embodiment of the present invention, a low voltage ride through emergency control system for a high voltage inverter master controller, which utilizes the low voltage ride through emergency control system for the high voltage inverter master controller, and the low voltage ride through emergency control method for the high voltage inverter master controller comprises the following steps:
the method comprises the following steps: the high voltage is recovered after instantaneous power failure, the frequency converter can be automatically started, and the time is related to specific loads through kinetic energy buffering. When the input voltage of the frequency conversion device is within 10 percent of 10kV, the motor can continuously and normally work at rated load;
step two: the output voltage of the frequency conversion device basically keeps 10kV unchanged; when the input 10kV suddenly drops by 10% -40%, the equipment automatically performs capacity reduction operation according to the current input voltage, and when the 10kV input voltage is recovered to 10%, the frequency converter automatically recovers to the working condition before capacity reduction; when the input 10KV suddenly drops to below 60% or the power grid is flashed for 3S, the power supply is restored: the frequency conversion device can automatically recover to the operation condition before power failure. And continuous operation of the equipment under the condition of power grid flicker is realized.
Referring to fig. 1 in this embodiment, the low voltage ride through region is set in an initialization program of the controller according to an operation rule of the high voltage inverter.
In this embodiment, referring to fig. 1, the low voltage ride through region determination is performed in a master controller of a high voltage frequency converter, so as to continuously detect the voltage of a power grid.
In this embodiment, referring to fig. 1, the grid voltage needs to be continuously detected, and the range and the time duration of the low voltage ride through are determined by the dynamic detection feedback signal.
In this embodiment, referring to fig. 1, the input value of the grid-connected point voltage needs to be determined by the controller of the medium-high voltage inverter in each execution: if the system is in the normal range, the system is normally operated in a grid-connected mode; if the voltage is lower than the normal operation voltage, the system is in a low voltage ride through region.
In this embodiment, referring to fig. 1, the grid-connected input voltage counting variable needs to be determined: when the system is in a low voltage ride through range, the system is in a low voltage ride through region, low voltage control is required, and the reactive power is generated to support the rapid recovery of the grid voltage; when the voltage drops to the low voltage crossing range of the third section and exceeds the set time limit value, the high-voltage frequency conversion device can be stopped and disconnected.
In this embodiment, referring to fig. 2, the low voltage ride through range is divided into three ranges, which are respectively within 10% of the rated voltage, 10% -40% of the rated voltage, and more than 40% of the rated voltage. When the high-voltage detection device detects that the input voltage suddenly drops, the low-voltage ride-through emergency control system of the master control machine of the high-voltage frequency converter controls the output voltage according to the actual input value of the voltage. When the input voltage suddenly changes, the output voltage is slowly reduced, and too large impact can not be brought to the motor; the device voltage also gradually recovers to a normal value when the input voltage recovers. The output current will suddenly drop to a lower value that can ensure the motor to run; when the input voltage recovers, the output current can recover to the current required by the normal working condition of the equipment along with the recovery of the output voltage.
Referring to fig. 3 in this embodiment, when the grid voltage suddenly drops at time t1, the low voltage ride through emergency control device controls the operation state of the equipment to maintain normal operation during the time period from t1 to t 2; the DC bus voltage will slowly drop into the low voltage ride through range in the time period t 1-t 2, and meanwhile, the motor speed will maintain normal operation in a certain time period and then start to drop to the low voltage ride through operation speed in a small amplitude. All data in the range of t 2-t 3 are controlled by the low voltage ride through emergency control device to operate in the low voltage ride through range. the grid voltage recovery starts at the time t3, but other data recovery to the normal state needs a certain short time to recover. And the operation state is maintained in a low voltage ride through state in a time period from t3 to t4, the voltage of the direct current bus is gradually recovered to a normal value, and the rotating speed is maintained in the lowest state of the low voltage ride through operation. And the equipment operation state is recovered to be normal in the time period from t4 to t5, the equipment rotation speed is gradually recovered, and the normal operation is recovered at the time t 5. All times referred to in the figures are related to the specific load of the device.
When the low-voltage ride-through emergency control system and the method for the high-voltage frequency converter master controller are used, the high-voltage detection device continuously performs high-voltage detection on equipment and provides a feedback signal for the low-voltage ride-through emergency control system when the frequency converter is in a high-voltage operation state, and the low-voltage ride-through emergency control system can automatically perform judgment processing according to a low-voltage ride-through range set in advance when the high-voltage detection device detects that voltage drops. The frequency converter stops outputting, the rectification stops, and the equipment enters a standby state. At the moment, the low-voltage ride-through emergency control system judges whether the power grid voltage and the unit bus voltage are recovered or not according to the feedback signal of the high-voltage detection device within a set time limit, if the power grid voltage is recovered, the rectification is restarted, the equipment enters a ready state and automatically starts the airplane to recover to a normal working condition of equipment operation; if the voltage of the power grid exceeds the set time limit and is not recovered, the equipment executes high-voltage drop protection action and stops; the method comprises the following steps: the high voltage is recovered after instantaneous power failure, the frequency converter can be automatically started, and the time is related to specific loads through kinetic energy buffering. When the input voltage of the frequency conversion device is within 10 percent of 10kV, the motor can continuously and normally work at rated load, and the output voltage of the frequency conversion device basically keeps 10kV unchanged; when the input 10kV suddenly drops by 10% -40%, the equipment automatically performs capacity reduction operation according to the current input voltage, and when the 10kV input voltage is recovered to 10%, the frequency converter automatically recovers to the working condition before capacity reduction; when the input 10KV suddenly drops to below 60% or the power grid is flashed for 3S, the power supply is restored: the frequency conversion device can automatically recover to the operation condition before power failure. And continuous operation of the equipment under the condition of power grid flicker is realized.
While there have been shown and described what are at present considered the fundamental principles and essential features of the invention and its advantages, it will be apparent to those skilled in the art that the invention is not limited to the details of the foregoing exemplary embodiments, but is capable of other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (8)
1. A low voltage ride through emergency control system for a high voltage frequency converter master controller is characterized by comprising a frequency converter and a high voltage detection device;
when the frequency converter is in a high-voltage operation state, the high-voltage detection device continuously performs high-voltage detection on equipment and provides a feedback signal for the low-voltage ride-through emergency control system, and when the high-voltage detection device detects that voltage drops, the low-voltage ride-through emergency control system automatically performs judgment processing according to a low-voltage ride-through range set in advance; the frequency converter stops outputting, the rectification stops, and the equipment enters a standby state; at the moment, the low-voltage ride-through emergency control system judges whether the power grid voltage and the unit bus voltage are recovered or not according to the feedback signal of the high-voltage detection device within a set time limit, if the power grid voltage is recovered, the rectification is restarted, the equipment enters a ready state and automatically starts the airplane to recover to a normal working condition of equipment operation; and if the voltage of the power grid exceeds the set time limit and is not recovered, the equipment executes a high-voltage drop protection action and stops.
2. The low voltage ride-through emergency control system for the master controller of the high voltage inverter as claimed in claim 1, wherein the low voltage ride-through region is in a range of a first section when the input voltage falls to 10% of the rated voltage of the device; when the input voltage drops to 10% -40% of the rated voltage of the equipment, the low-voltage crossing area in the second stage is formed; this range is the third stage low voltage pass-through when the input voltage drops above 40% of the rated voltage of the device.
3. A low voltage ride through emergency control method for a master controller of a high voltage frequency converter is characterized by comprising the following steps:
the method comprises the following steps: the high voltage is recovered after instantaneous power failure, the frequency converter can be automatically started, and the time is related to the specific load through kinetic energy buffering; when the input voltage of the frequency conversion device is within 10 percent of 10kV, the motor can continuously and normally work at rated load;
step two: the output voltage of the frequency conversion device basically keeps 10kV unchanged; when the input 10kV suddenly drops by 10% -40%, the equipment automatically performs capacity reduction operation according to the current input voltage, and when the 10kV input voltage is recovered to 10%, the frequency converter automatically recovers to the working condition before capacity reduction; when the input 10KV suddenly drops to below 60% or the power grid is flashed for 3S, the power supply is restored: the frequency conversion device can automatically recover to the operation condition before power failure, and continuous operation of equipment under the condition of power grid flicker is realized.
4. The method as claimed in claim 3, wherein the low voltage ride through region is set in an initialization program of a controller according to an operation rule of the high voltage inverter.
5. The method as claimed in claim 3, wherein the low voltage ride through region determination is performed in the master controller of the high voltage inverter to continuously detect the voltage of the power grid.
6. The method as claimed in claim 3, wherein the grid voltage needs to be detected continuously, and the dynamic detection feedback signal determines the range and duration of the low voltage ride through.
7. The method as claimed in claim 3, wherein the voltage input value of the point-to-point connection needs to be determined by the controller of the high-voltage inverter each time: if the system is in the normal range, the system is normally operated in a grid-connected mode; if the voltage is lower than the normal operation voltage, the system is in a low voltage ride through region.
8. The low-voltage ride-through emergency control method for the master controller of the high-voltage frequency converter according to claim 3, wherein the grid-connected input voltage counting variable needs to be judged: when the system is in a low voltage ride through range, the system is in a low voltage ride through region, low voltage control is required, and the reactive power is generated to support the rapid recovery of the grid voltage; when the voltage drops to the low voltage crossing range of the third section and exceeds the set time limit value, the high-voltage frequency conversion device can be stopped and disconnected.
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| CN202111330792.5A CN113992114A (en) | 2021-11-11 | 2021-11-11 | Low-voltage ride-through emergency control system and method for high-voltage frequency converter master controller |
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| CN202111330792.5A CN113992114A (en) | 2021-11-11 | 2021-11-11 | Low-voltage ride-through emergency control system and method for high-voltage frequency converter master controller |
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Citations (5)
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| CN203707871U (en) * | 2014-01-15 | 2014-07-09 | 陕西普联电气有限公司 | Low-voltage ride-through apparatus of frequency converter |
| CN107302228A (en) * | 2017-07-07 | 2017-10-27 | 中国石油大学(华东) | A kind of general determination methods in low voltage crossing region based on DSP |
| CN112531774A (en) * | 2020-12-01 | 2021-03-19 | 辽宁东科电力有限公司 | Low-voltage ride-through operation control method of inverter type distributed power supply |
| CN212850228U (en) * | 2020-07-20 | 2021-03-30 | 啸驰电气股份有限公司 | Frequency converter mounting bracket for fan of dust removal equipment |
| CN113395033A (en) * | 2021-07-06 | 2021-09-14 | 东方日立(成都)电控设备有限公司 | Control method and system for low voltage ride through of high-voltage frequency converter |
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2021
- 2021-11-11 CN CN202111330792.5A patent/CN113992114A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203707871U (en) * | 2014-01-15 | 2014-07-09 | 陕西普联电气有限公司 | Low-voltage ride-through apparatus of frequency converter |
| CN107302228A (en) * | 2017-07-07 | 2017-10-27 | 中国石油大学(华东) | A kind of general determination methods in low voltage crossing region based on DSP |
| CN212850228U (en) * | 2020-07-20 | 2021-03-30 | 啸驰电气股份有限公司 | Frequency converter mounting bracket for fan of dust removal equipment |
| CN112531774A (en) * | 2020-12-01 | 2021-03-19 | 辽宁东科电力有限公司 | Low-voltage ride-through operation control method of inverter type distributed power supply |
| CN113395033A (en) * | 2021-07-06 | 2021-09-14 | 东方日立(成都)电控设备有限公司 | Control method and system for low voltage ride through of high-voltage frequency converter |
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