CN105811784A - Low-voltage frequency converter with high-low-voltage ride-through functions - Google Patents
Low-voltage frequency converter with high-low-voltage ride-through functions Download PDFInfo
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- CN105811784A CN105811784A CN201610148019.XA CN201610148019A CN105811784A CN 105811784 A CN105811784 A CN 105811784A CN 201610148019 A CN201610148019 A CN 201610148019A CN 105811784 A CN105811784 A CN 105811784A
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- Prior art keywords
- voltage
- frequency converter
- buck
- low voltage
- unit
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Classifications
-
- 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
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
- H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
- H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
- H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
- H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
-
- 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
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/061—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for DC powered loads
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Rectifiers (AREA)
Abstract
The invention discloses a low-voltage frequency converter with high-low-voltage ride-through functions. The low-voltage frequency converter mainly comprises a rectifying filtering unit, a boost-buck converter, an inversion unit, a frequency converter uninterrupted alternating current control power supply and a frequency converter controller, wherein the rectifying filtering unit comprises a filter circuit consisting of a three-phase uncontrollable rectifier circuit and a resistive capacitor; the boost-buck converter adopts the Buck-Boost topology, so that the functions of boosting and bucking can be realized for stabling the voltage in the direct current link of the frequency converter; the inverter is a three-phase full-bridge inverter and used for outputting a three-phase alternating current voltage; the frequency converter uninterrupted alternating current control power supply can ensure the continuous operation of the frequency converter controller; and the frequency converter controller is used for carrying out writing-in, controlling, operating, protecting and the like on the various functional parameters of the frequency converter. According to the low-voltage frequency converter, the steady output voltage and current can be maintained when the system voltage is bucked or boosted, so that a motor connected with the frequency converter is not affected by the high-low voltages, and the functions of high-low-voltage ride-through of the low-voltage frequency converter are realized.
Description
Technical field
The present invention relates to a kind of low voltage frequency converter with high-low voltage ride-through capability, belong to low voltage frequency converter technology
Field.
Background technology
Converter, because it is controlling and the irreplaceable advantage of energy-conservation aspect, has obtained widely should in every profession and trade
With.But owing to line voltage is unstable, cause converter in use to create new problem: converter is just
Pressure trip protection (i.e. low voltage crossing).Most converter high-low voltage ride-through capabilities are poor, and some does not even have
Standby this ability.
In recent years, due to the disappearance of low voltage frequency converter high-low voltage ride-through capability, the most once there is huge damage in every profession and trade
Become estranged accident, for electric power, oil, chemical industry, quasiconductor, military project, polysilicon, metallurgy, coal, optical fiber,
The industry and enterprise that weaving equicontinuity produces, voltage dip can cause converter and connect motor stopping thereof, cause
Fluctuation, technological process interrupt, operation confusion, cause hundreds of thousands unit, the economy of the most up to ten million units at least
Loss, serious also can cause serious accident and environmental pollution accident.Meanwhile, overtension also can make
Converter internal power electronic device temperature rise is too high, causes tripping operation.Such as whole nation thermal power plant there occurs a lot of successively
System transient fault causes the event that fired power generating unit is shut down, and causes system concussion or off-the-line, has a power failure Reduction of Students' Study Load on a large scale
Lotuses etc., cause certain social and economic effect, and reason is when low-voltage in short-term or short time voltage are interrupted
Feeder (machine supplying powder) converter locking is out of service, causes stove chamber fire-extinguishing protection (MFT) action to shut down,
Have impact on normal commercial production, economy is caused massive losses.
Therefore, for preventing this type of accident from again occurring, reduce unnecessary loss, improve the height electricity of converter
Pressure ride-through capability is extremely urgent.
Summary of the invention
The technical problem to be solved is the defect overcoming prior art, it is provided that one has high-low voltage
The low voltage frequency converter of ride-through capability, for when converter input voltage is too high or too low, maintains converter output
Stablizing of voltage.
For solving above-mentioned technical problem, the technical solution used in the present invention is as follows:
A kind of low voltage frequency converter with high-low voltage ride-through capability, including rectification filtering unit, buck voltage stabilizing
The uninterrupted ac control power supply of unit, inversion unit, frequency converter controller and converter；
System three-phase alternating voltage accesses rectification filtering unit, and the input of buck voltage regulation unit is rectifying and wave-filtering
Unit, outfan is inversion unit, inversion unit output termination asynchronous machine, frequency converter controller output termination
Entering inversion unit power electronic devices control terminal, the uninterrupted ac control power supply of converter accesses Frequency Converter Control
Device power input terminal；
System three-phase alternating voltage is converted into DC voltage by described rectification filtering unit, provides electricity for inversion unit
Source, simultaneously reflection system power source voltage state；Described rectification filtering unit includes rectification circuit and filter circuit,
Described rectification circuit is by diode D1～D6Constitute, described filtered electrical routing resistance R1, resistance R2And electric capacity
C1, electric capacity C2Constitute；
Described buck voltage regulation unit uses Buck-Boost topology, is that a kind of output voltage both can be higher than also may be used
Single tube non-isolated DC converter less than input voltage；Described buck voltage regulation unit is by switch transistor T, inductance
L, diode D7With electric capacity C3Constitute；
Described inversion unit uses three phase full bridge inverter structure, by switching tube SAC1～SAC6Composition, by buck
The output voltage of voltage regulation unit carries out three-phase inversion, provides stable three-phase alternating-current supply for motor；
Described frequency converter controller for converter various functions parameter write, control, run, protect；Institute
State frequency converter controller and measure the size of rectification filtering unit output voltage, control buck voltage regulation unit breaker in middle
The break-make of pipe, stablizes the output voltage of buck voltage regulation unit.
The control mode of aforesaid buck voltage regulation unit is PWM control.
The output voltage U of aforesaid buck voltage regulation unitOIt is maintained at 540V, during without external direct current power supply, rises
The input voltage range of lowering and stabilizing blood pressure unit is 20%Ud～130%Ud, when having external direct current power supply, buck is steady
The input voltage range of pressure unit is 0%Ud～130%Ud, wherein, UdInput electricity for buck voltage regulation unit
Pressure.
The inductance of aforesaid buck voltage regulation unit and the computing formula of electric capacity are as follows:
Wherein, DminAnd DmaxIt is respectively minima and maximum, the U of dutycycledminAnd UdmaxIt is respectively and rises
The minima of lowering and stabilizing blood pressure unit input voltage and maximum, R is load resistance, and L is inductance value, C3For electricity
Capacitance, TSFor switch periods, Δ UOFor output ripple.
Aforesaid inversion unit uses SPWM control, current tracking PWM or space vector PWM.
Aforesaid when user accesses DC source, described frequency converter controller controls the break-make of DC source, when
Buck voltage regulation unit input voltage drop, to after certain threshold value, reliably connects DC source, and remaining time protects
Hold and reliably disconnect DC source.
Aforesaid low voltage frequency converter also includes straight-flow system input block, is used for accessing external dc power；Described
Straight-flow system input block is in parallel with the outfan of buck voltage regulation unit.
Aforesaid straight-flow system input block is the accumulator battery that terminal voltage reaches more than 100V, fired power generating unit
220V DC dynamo power supply, superconducting energy storage or lithium-air battery.
The uninterrupted ac control power supply of aforesaid converter uses small-sized UPS, first passes through transformator by system three-phase
Input voltage blood pressure lowering, then to access small-sized UPS be frequency converter controller energy supply.
The uninterrupted ac control power supply of aforesaid converter uses Large UPS.
The beneficial effect that the present invention is reached:
The difference of the present invention and conventional low voltage converter is to add regulation loop in rectification link and inversion link
Joint, when the situations such as too high, too low, the decompression at system power source voltage, maintains frequency converter output voltage stable,
The connected motor of converter is made not affected by system high-low voltage, it is achieved high-low voltage is passed through；If access direct current
Power supply, then may be implemented in when short time voltage is interrupted and still ensure that converter stably exports.Meanwhile, this converter knot
Structure is simple, integrated design and production are greatly improved the reliability of work, it is to avoid user buys converter
After again converter is transformed.
Accompanying drawing explanation
Fig. 1 is the low voltage frequency converter internal structure schematic diagram with high-low pressure ride-through capability.
Detailed description of the invention
The invention will be further described below in conjunction with the accompanying drawings.Following example are only used for this is clearly described
The technical scheme of invention, and can not limit the scope of the invention with this.
As it is shown in figure 1, the low voltage frequency converter with high-low voltage ride-through capability of the present invention, mainly include rectification
Filter unit, buck voltage regulation unit, inversion unit, frequency converter controller, straight-flow system input block and change
Frequently the uninterrupted ac control power supply of device.System three-phase alternating voltage accesses rectification filtering unit, buck voltage stabilizing list
The input of unit is rectification filtering unit, and outfan is inversion unit, inversion unit output termination asynchronous machine.
Straight-flow system input block is in parallel with the outfan of buck voltage regulation unit, and frequency converter controller outfan accesses inverse
Becoming unit power electronic devices control terminal, the uninterrupted ac control power supply of converter accesses frequency converter controller electricity
Source input terminal.
Wherein, system three-phase alternating voltage is converted into DC voltage by rectification filtering unit, provides for inversion unit
Power supply, can reflect system power source voltage state simultaneously.Rectifying part is by diode D1～D6The three-phase constituted is not
Controlled rectification circuit, filtering part is by resistance R1、R2With electric capacity C1、C2The filter circuit constituted, when system electricity
When extruding existing exception, the voltage on electric capacity also there will be respective change.
Buck voltage regulation unit uses Buck-Boost topology, is that a kind of output voltage both can be higher than can also be low
Single tube non-isolated DC converter in input voltage.By switch transistor T, inductance L, diode D7, electric capacity C3
Composition, both can realize high voltage crossing when high voltage occurs in system, it is possible to realize low when system voltage drops temporarily
Voltage ride-through.Control mode is PWM control.Time without external direct current power supply, the input of buck voltage regulation unit
Voltage range is 20%Ud～130%Ud(Ud≈ 540V), when having external direct current power supply, buck voltage regulation unit
Input voltage range be 0%Ud～130%Ud.The output voltage U of buck voltage regulation unitOIt is maintained at 540V left
The right side, but polarity is contrary with input voltage.The computing formula of inductance and electric capacity is as follows:
Wherein, UdFor the input voltage of buck voltage regulation unit, DminAnd DmaxIt is respectively the minimum of dutycycle
Value and maximum, UdminAnd UdmaxIt is respectively minima and the maximum of buck voltage regulation unit input voltage,
UOFor buck voltage regulation unit output voltage, about 540V, R are load resistance, and L is inductance value, C3For electricity
Capacitance, TSFor switch periods, Δ UOFor output ripple.
Inversion unit uses three phase full bridge inverter structure, by switching tube SAC1～SAC6Composition, by buck voltage stabilizing
The output voltage of unit carries out three-phase inversion, provides stable three-phase alternating-current supply for motor.Can use many
Kind of PWM controls technology, such as SPWM control, current tracking PWM, space vector PWM etc., according to change
Frequently the requirement of device manufacturer or user freely sets.
Frequency converter controller in the present invention has all functions of universal frequency converter, for converter various functions
The write of parameter, control, run, protection etc..But following points are different: a) have stable Buck-Boost
The function of changer output voltage；Measure the size of rectification filtering unit output voltage, control buck voltage stabilizing list
The break-make of unit's breaker in middle pipe, keeps Buck-Boost output voltage stabilization at 540V；B) there is universal frequency converter
All GPF (General Protection Falses, such as overcurrent protection, overtemperature protection etc., but the test point of wherein high-low voltage protection is positioned at liter
The outlet side of decompression voltage regulator；C) function is selected.When user accesses DC source, control DC source
Break-make, after buck voltage regulation unit input voltage drop to certain threshold value, reliably connect DC source,
Other times keep reliable and disconnect.
Straight-flow system input block is selected module, requires to decide whether to be equipped with according to user, is used for accessing outside
DC source, for providing energy to support when system input voltage is too low.Straight-flow system can be accumulator battery
(terminal voltage reaches more than 100V), it is possible to use the DC source of other energy storage modes is (such as fired power generating unit
220V DC dynamo power supply, superconducting energy storage, lithium-air battery etc.).
The uninterrupted ac control power supply of converter according to small-sized UPS, then first passes through transformator by defeated for system three-phase
Enter voltage step-down, then to access UPS be frequency converter controller energy supply, it is ensured that frequency converter controller steady operation.If
User itself is furnished with Large UPS, it is possible to be directly accessed Large UPS, and reliability is higher, as thermal power plant can use
Unit Large UPS provides energy for frequency converter controller.
The above is only the preferred embodiment of the present invention, it is noted that for the common skill of the art
For art personnel, on the premise of without departing from the technology of the present invention principle, it is also possible to make some improvement and deformation,
These improve and deformation also should be regarded as protection scope of the present invention.
Claims (10)
1. a low voltage frequency converter with high-low voltage ride-through capability, it is characterised in that include rectifying and wave-filtering
Unit, buck voltage regulation unit, inversion unit, frequency converter controller and the uninterrupted ac control power supply of converter；
System three-phase alternating voltage accesses rectification filtering unit, and the input of buck voltage regulation unit is rectifying and wave-filtering
Unit, outfan is inversion unit, inversion unit output termination asynchronous machine, frequency converter controller output termination
Entering inversion unit power electronic devices control terminal, the uninterrupted ac control power supply of converter accesses Frequency Converter Control
Device power input terminal；
System three-phase alternating voltage is converted into DC voltage by described rectification filtering unit, provides electricity for inversion unit
Source, simultaneously reflection system power source voltage state；Described rectification filtering unit includes rectification circuit and filter circuit,
Described rectification circuit is by diode D1～D6Constitute, described filtered electrical routing resistance R1, resistance R2And electric capacity
C1, electric capacity C2Constitute；
Described buck voltage regulation unit uses Buck-Boost topology, is that a kind of output voltage both can be higher than also may be used
Single tube non-isolated DC converter less than input voltage；Described buck voltage regulation unit is by switch transistor T, inductance
L, diode D7With electric capacity C3Constitute；
Described inversion unit uses three phase full bridge inverter structure, by switching tube SAC1～SAC6Composition, by buck
The output voltage of voltage regulation unit carries out three-phase inversion, provides stable three-phase alternating-current supply for motor；
Described frequency converter controller for converter various functions parameter write, control, run, protect；Institute
State frequency converter controller and measure the size of rectification filtering unit output voltage, control buck voltage regulation unit breaker in middle
The break-make of pipe, stablizes the output voltage of buck voltage regulation unit.
A kind of low voltage frequency converter with high-low voltage ride-through capability the most according to claim 1, it is special
Levying and be, the control mode of described buck voltage regulation unit is PWM control.
A kind of low voltage frequency converter with high-low voltage ride-through capability the most according to claim 1, it is special
Levy and be, the output voltage U of described buck voltage regulation unitOIt is maintained at 540V, during without external direct current power supply,
The input voltage range of buck voltage regulation unit is 20%Ud～130%Ud, when having external direct current power supply, buck
The input voltage range of voltage regulation unit is 0%Ud～130%Ud, wherein, UdInput for buck voltage regulation unit
Voltage.
4. according to a kind of low voltage frequency converter with high-low voltage ride-through capability described in claim 1 or 3, its
Being characterised by, the inductance of described buck voltage regulation unit and the computing formula of electric capacity are as follows:
Wherein, DminAnd DmaxIt is respectively minima and maximum, the U of dutycycledminAnd UdmaxIt is respectively and rises
The minima of lowering and stabilizing blood pressure unit input voltage and maximum, R is load resistance, and L is inductance value, C3For
Capacitance, TSFor switch periods, Δ UOFor output ripple.
A kind of low voltage frequency converter with high-low voltage ride-through capability the most according to claim 1, it is special
Levying and be, described inversion unit uses SPWM control, current tracking PWM or space vector PWM.
A kind of low voltage frequency converter with high-low voltage ride-through capability the most according to claim 1, it is special
Levying and be, when user accesses DC source, described frequency converter controller controls the break-make of DC source, works as liter
Lowering and stabilizing blood pressure unit input voltage drop, to after certain threshold value, reliably connects DC source, and remaining time keeps
Reliably disconnect DC source.
A kind of low voltage frequency converter with high-low voltage ride-through capability the most according to claim 1, it is special
Levying and be, described low voltage frequency converter also includes straight-flow system input block, is used for accessing external dc power；Institute
State straight-flow system input block in parallel with the outfan of buck voltage regulation unit.
A kind of low voltage frequency converter with high-low voltage ride-through capability the most according to claim 7, it is special
Levying and be, described straight-flow system input block is the accumulator battery that terminal voltage reaches more than 100V, fired power generating unit
220V DC dynamo power supply, superconducting energy storage or lithium-air battery.
A kind of low voltage frequency converter with high-low voltage ride-through capability the most according to claim 1, it is special
Levying and be, the uninterrupted ac control power supply of described converter uses small-sized UPS, first passes through transformator by system three
Phase input voltage blood pressure lowering, then to access small-sized UPS be frequency converter controller energy supply.
A kind of low voltage frequency converter with high-low voltage ride-through capability the most according to claim 1, it is special
Levying and be, the uninterrupted ac control power supply of described converter uses Large UPS.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610148019.XA CN105811784A (en) | 2016-03-15 | 2016-03-15 | Low-voltage frequency converter with high-low-voltage ride-through functions |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610148019.XA CN105811784A (en) | 2016-03-15 | 2016-03-15 | Low-voltage frequency converter with high-low-voltage ride-through functions |
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| Publication Number | Publication Date |
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| CN105811784A true CN105811784A (en) | 2016-07-27 |
Family
ID=56467567
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610148019.XA Pending CN105811784A (en) | 2016-03-15 | 2016-03-15 | Low-voltage frequency converter with high-low-voltage ride-through functions |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106253734A (en) * | 2016-08-30 | 2016-12-21 | 保定卓尔电气有限公司 | A kind of low-voltage ride-through power source for frequency converter apparatus control system of improvement |
| CN109361315A (en) * | 2018-11-21 | 2019-02-19 | 西安埃克森电源有限公司 | A kind of input super wide range variable-frequency power sources input method for stabilizing voltage |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101110562A (en) * | 2006-07-19 | 2008-01-23 | 乐金电子(天津)电器有限公司 | Air conditioner with plurality of indoor units and its operating control method |
| CN201601610U (en) * | 2009-11-30 | 2010-10-06 | 常熟开关制造有限公司(原常熟开关厂） | Inverter circuit |
| CN102104341A (en) * | 2011-02-28 | 2011-06-22 | 南京航空航天大学 | Single-stage boost inverter |
| CN102545646A (en) * | 2012-01-18 | 2012-07-04 | 华北电力大学 | Abnormal voltage ride-through power supply of frequency converter |
| US20130049707A1 (en) * | 2011-08-23 | 2013-02-28 | Delta Electronics (Shanghai) Co., Ltd. | Dc chopper and dc chopping method for doubly fed induction generator system |
| CN103023344A (en) * | 2012-12-25 | 2013-04-03 | 珠海万力达电气股份有限公司 | Universal smart grid power electronic device |
| CN103219795A (en) * | 2013-05-10 | 2013-07-24 | 温州大学 | High-voltage and high-power uninterruptible power supply device |
| 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 |
| CN204361931U (en) * | 2014-12-11 | 2015-05-27 | 中国计量学院 | Switching magnetic-resistance wind-driven generator exports electrical conversion systems |
| CN204706895U (en) * | 2015-02-09 | 2015-10-14 | 河南柏特电气设备有限公司 | Fossil power plant auxiliary engine frequency converter high-low voltage traversing device |
-
2016
- 2016-03-15 CN CN201610148019.XA patent/CN105811784A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101110562A (en) * | 2006-07-19 | 2008-01-23 | 乐金电子(天津)电器有限公司 | Air conditioner with plurality of indoor units and its operating control method |
| CN201601610U (en) * | 2009-11-30 | 2010-10-06 | 常熟开关制造有限公司(原常熟开关厂） | Inverter circuit |
| CN102104341A (en) * | 2011-02-28 | 2011-06-22 | 南京航空航天大学 | Single-stage boost inverter |
| US20130049707A1 (en) * | 2011-08-23 | 2013-02-28 | Delta Electronics (Shanghai) Co., Ltd. | Dc chopper and dc chopping method for doubly fed induction generator system |
| CN102545646A (en) * | 2012-01-18 | 2012-07-04 | 华北电力大学 | Abnormal voltage ride-through power supply of frequency converter |
| CN103023344A (en) * | 2012-12-25 | 2013-04-03 | 珠海万力达电气股份有限公司 | Universal smart grid power electronic device |
| CN103219795A (en) * | 2013-05-10 | 2013-07-24 | 温州大学 | High-voltage and high-power uninterruptible power supply device |
| 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 |
| CN204361931U (en) * | 2014-12-11 | 2015-05-27 | 中国计量学院 | Switching magnetic-resistance wind-driven generator exports electrical conversion systems |
| CN204706895U (en) * | 2015-02-09 | 2015-10-14 | 河南柏特电气设备有限公司 | Fossil power plant auxiliary engine frequency converter high-low voltage traversing device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106253734A (en) * | 2016-08-30 | 2016-12-21 | 保定卓尔电气有限公司 | A kind of low-voltage ride-through power source for frequency converter apparatus control system of improvement |
| CN109361315A (en) * | 2018-11-21 | 2019-02-19 | 西安埃克森电源有限公司 | A kind of input super wide range variable-frequency power sources input method for stabilizing voltage |
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Application publication date: 20160727 |
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