CN105470967B - A kind of low voltage ride through device based on supercapacitor group - Google Patents
A kind of low voltage ride through device based on supercapacitor group Download PDFInfo
- Publication number
- CN105470967B CN105470967B CN201610014202.0A CN201610014202A CN105470967B CN 105470967 B CN105470967 B CN 105470967B CN 201610014202 A CN201610014202 A CN 201610014202A CN 105470967 B CN105470967 B CN 105470967B
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- Prior art keywords
- control unit
- supercapacitor
- supercapacitor group
- booster converter
- low voltage
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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
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
-
- 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
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Inverter Devices (AREA)
Abstract
The invention discloses a kind of low voltage ride through device based on supercapacitor group, including charging control unit, supercapacitor group, DC/DC booster converter, DSP control unit and detection circuit；Charging control unit is connected with DC/DC booster converter, and supercapacitor group is in parallel with DC/DC booster converter, and the DC/DC booster converter is also connected with frequency converter；The detection circuit is connect by conducting wire with charging control unit and supercapacitor group, implementation monitoring is carried out to supercapacitor both end voltage by detection circuit, when supercapacitor group is not up to operating voltage, DSP control unit controls the conducting of charging control unit internal switch pipe, it is set to charge supercapacitor group, when supercapacitor group reaches operating voltage, DSP control unit controls the shutdown of charging control unit internal switch pipe, it is made to stop working.The present invention solves the problems, such as power station auxiliary frequency conversion low voltage crossing, greatly improves stability, the reliability of electric system.
Description
Technical field
The present invention relates to power plant to monitor field, and in particular to a kind of low voltage ride through device based on supercapacitor group.
Background technique
The low voltage crossing problem of power plant's one kind subsidiary engine frequency conversion, seriously threatens the safe operation of electric system, once go out
Successive trip, electric system will be faced paralysis by existing low voltage crossing problem, fired power generating unit.The frequency converter of industrial application is set at present
Meter is all not have low voltage ride-through capability using cross-straight-intersection circuit, and when low voltage crossing occurs, frequency converter just be will do it
Under-voltage protection movement, closing output.A kind of subsidiary engine of thermal power plant once blower, air-introduced machine, feeder etc..These power for auxiliary machinery
From several kilowatts of supreme megawatts, voltage class is 380V to 6kV etc., and the low voltage crossing problem moment of these frequency converters threatens
The safety of power grid.National grid has paid much attention to the security risk of low voltage crossing at present, but since current technology cannot solve
Certainly, there are no form technical specification.
Summary of the invention
It is auxiliary for solving thermal power plant it is an object of the invention to provide a kind of low voltage ride through device based on supercapacitor group
Machine frequency conversion low voltage crossing problem, this system can solve the problems, such as the low voltage crossing of each voltage class subsidiary engine of thermal power plant, power
From several kilowatts of supreme megawatts, and economic serviceability with higher.
In order to achieve the above objectives, technical scheme is as follows：
A kind of low voltage ride through device based on supercapacitor group, including charging control unit, supercapacitor group,
DC/DC booster converter, DSP control unit and detection circuit；
The charging control unit is connected with DC/DC booster converter, and supercapacitor group and DC/DC booster converter are simultaneously
Connection, the DC/DC booster converter are also connected with frequency converter；The detection circuit passes through conducting wire and charging control unit and super
Capacitor group connection, and will test electric current, voltage parameter be sent into DSP control unit in；
Implementation monitoring is carried out to supercapacitor both end voltage by detection circuit, when supercapacitor group not up to works
When voltage, DSP control unit controls the conducting of charging control unit internal switch pipe, so that it is charged supercapacitor group, when super
When grade capacitor group reaches operating voltage, DSP control unit controls the shutdown of charging control unit internal switch pipe, it is made to stop work
Make.
In a preferred embodiment of the invention, DC/DC booster converter output by anti-backflow diode with
Frequency converter connection.
In a preferred embodiment of the invention, the input side of the charging control unit is connect with power grid, outlet side
It is connect with supercapacitor group and DC/DC converter.
In a preferred embodiment of the invention, the charging control unit provides DC charging for supercapacitor group
Power supply implements constant-current charge to supercapacitor group with electric current appropriate.
In a preferred embodiment of the invention, the supercapacitor group is by series-parallel group of multiple supercapacitors
At making its pressure voltage reach frequency converter DC voltage level, storage energy can provide 10 seconds for DC/DC booster converter
The low voltage crossing time.
In a preferred embodiment of the invention, the step-up ratio of the DC/DC booster converter is 1~3, super capacitor
Device depth of discharge is about 0.8, so the stored energy capacitance of supercapacitor is the 0.35% of the power of DC/DC booster converter.
Through the above technical solutions, the beneficial effects of the invention are as follows：
The present invention can thoroughly solve the problems, such as power station auxiliary frequency conversion low voltage crossing, and technique is promoted and applied, will
The hidden danger for shutting down fire extinguishing caused by thermal power plant's low voltage crossing is thoroughly eliminated, stability, the reliability of electric system are greatly improved,
Its direct, indirect benefit can not be estimated.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is system structure diagram of the invention；
Fig. 2 is system structure schematic diagram of the invention.
Specific embodiment
In order to be easy to understand the technical means, the creative features, the aims and the efficiencies achieved by the present invention, tie below
Conjunction is specifically illustrating, and the present invention is further explained.
Referring to Figures 1 and 2, a kind of low voltage ride through device based on supercapacitor group, including it is charging control unit, super
Grade capacitor group, DC/DC booster converter, DSP control unit and detection circuit；Charging control unit and DC/DC boosting become
Parallel operation series connection, supercapacitor group is in parallel with DC/DC booster converter, and the DC/DC booster converter is also connected with frequency converter；
The detection circuit is connect by conducting wire with charging control unit and supercapacitor group, and will test electric current, voltage parameter
It is sent into DSP control unit；Implementation monitoring is carried out to supercapacitor both end voltage by detection circuit, when supercapacitor group
Not up to operating voltage when, DSP control unit control charging control unit internal switch pipe conducting, make it to supercapacitor group
Charging, when supercapacitor group reaches operating voltage, DSP control unit controls the shutdown of charging control unit internal switch pipe,
It is made to stop working.
DSP main control unit detects power supply status, when network voltage is less than the 90% of voltage rating, starts DC/DC immediately
Booster converter is stopped by exporting for DC/DC booster converter to frequency converter offer DC power supply immediately when power returns.
DSP main control unit real-time detection condenser voltage and output voltage guarantee output voltage stabilization in the operating voltage of frequency converter.
Generally, DC/DC booster converter output is connected by anti-backflow diode D1, D2 and frequency converter.It works normally
Under state, the output DC voltage of DC/DC booster converter is lower than the DC voltage of frequency converter rectification, two counterflow-preventings of D1, D2
Diode cut-off.When low voltage crossing occurs, the AC power source of frequency converter input is reduced, and internal DC busbar voltage is caused to drop
Low, two diodes of D1, D2 are connected rapidly, provide mains power by DC/DC booster converter for frequency changer direct current bus,
Frequency converter is set to be able to maintain work in low voltage crossing.
Wherein the input side of charging control unit is connect with power grid, outlet side and supercapacitor group and DC/DC converter
Connection；Charging control unit provides DC charging power supply for supercapacitor group, real to supercapacitor group with electric current appropriate
Apply constant-current charge.When supercapacitor reaches operating voltage, charhing unit stops working, and DC/DC booster converter starts work
Make.
Charge control uses Hysteresis control mode, after supercapacitor is charged to operating voltage, detects voltage decline 5%
Afterwards, it is again turned on charger, to prevent frequent charge and overcharge.
And supercapacitor group is made of in series and parallel multiple supercapacitors, its pressure voltage is made to reach frequency converter DC voltage
Grade, storage energy can provide 10 seconds low voltage crossing time for DC/DC booster converter.
Therefore, supercapacitor not only has the characteristic of capacitor, while also having battery behavior, be it is a kind of between battery and
Novel specific components between capacitor have power density height, the fast advantage of the velocity of discharge.It is carried out when power grid is normal
Energy storage releases energy when low voltage crossing occurs.
Supercapacitor power density is high, up to 300W/KG~5000W/KG, is equivalent to 5~10 times of battery；And it can be into
Capable not current limliting charge and discharge, charging times are up to 106More than secondary.
The step-up ratio of DC/DC booster converter is 1~3, and supercapacitor depth of discharge is about 0.8, so super capacitor
The stored energy capacitance of device is the 0.35% of the power of DC/DC booster converter, and capacity of super capacitor is by formulaReally
It is fixed.
The effect of DC/DC boosting inverter be in order to make supercapacitor group store energy sufficiently discharge, it is super to reduce
The configuration of capacitor group improves energy storage utilization rate.If supercapacitor is directly parallel on the DC bus of frequency converter,
Supercapacitor group pressure voltage with higher is sought, and when supercapacitor group electric discharge 10%, DC bus-bar voltage is reduced to
The protection value of frequency converter causes undervoltage lockout failure, and the storage electricity utilization rate of supercapacitor only has 10% at this time.Therefore, it adopts
Capacitor energy can be made sufficiently to discharge with DC/DC booster converter, to reduce the configuration of supercapacitor group, improve storage
Energy utilization efficiency.
The present invention can thoroughly solve the problems, such as power station auxiliary frequency conversion low voltage crossing, and technique is promoted and applied, will
The hidden danger for shutting down fire extinguishing caused by thermal power plant's low voltage crossing is thoroughly eliminated, stability, the reliability of electric system are greatly improved,
Its direct, indirect benefit can not be estimated.
The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention.The technology of the industry
Personnel are it should be appreciated that the present invention is not limited to the above embodiments, and the above embodiments and description only describe this
The principle of invention, without departing from the spirit and scope of the present invention, various changes and improvements may be made to the invention, these changes
Change and improvement all fall within the protetion scope of the claimed invention.The claimed scope of the invention by appended claims and its
Equivalent thereof.
Claims (6)
1. a kind of low voltage ride through device based on supercapacitor group, which is characterized in that including charging control unit, super electricity
Container group, DC/DC booster converter, DSP control unit and detection circuit；
The charging control unit is connected with DC/DC booster converter, and supercapacitor group is in parallel with DC/DC booster converter,
The DC/DC booster converter is also connected with frequency converter；The detection circuit passes through conducting wire and charging control unit and super electricity
Container group connection, and will test electric current, voltage parameter be sent into DSP control unit in；
Implementation monitoring is carried out to supercapacitor both end voltage by detection circuit, when supercapacitor group is not up to operating voltage
When, DSP control unit controls the conducting of charging control unit internal switch pipe, so that it is charged supercapacitor group, when super electricity
When container group reaches operating voltage, DSP control unit controls the shutdown of charging control unit internal switch pipe, it is made to stop working；
DSP control unit detects power supply status, when network voltage is less than the 90% of voltage rating, starts DC/DC boosting inverter immediately
Device.
2. a kind of low voltage ride through device based on supercapacitor group according to claim 1, which is characterized in that described
The output of DC/DC booster converter is connect by anti-backflow diode with frequency converter.
3. a kind of low voltage ride through device based on supercapacitor group according to claim 1, which is characterized in that described
The input side of charging control unit is connect with power grid, and outlet side is connect with supercapacitor group and DC/DC booster converter.
4. a kind of low voltage ride through device based on supercapacitor group according to claim 1 or 3, which is characterized in that
The charging control unit provides DC charging power supply for supercapacitor group, is implemented with electric current appropriate to supercapacitor group
Constant-current charge.
5. a kind of low voltage ride through device based on supercapacitor group according to claim 1, which is characterized in that described
Supercapacitor group is made of in series and parallel multiple supercapacitors, its pressure voltage is made to reach frequency converter DC voltage level, storage
10 seconds low voltage crossing time can be provided for DC/DC booster converter by depositing energy.
6. a kind of low voltage ride through device based on supercapacitor group according to claim 1 or 5, which is characterized in that
The step-up ratio of the DC/DC booster converter is 1~3, and supercapacitor depth of discharge is about 0.8, so supercapacitor
Stored energy capacitance is the 0.35% of the power of DC/DC booster converter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610014202.0A CN105470967B (en) | 2016-01-11 | 2016-01-11 | A kind of low voltage ride through device based on supercapacitor group |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610014202.0A CN105470967B (en) | 2016-01-11 | 2016-01-11 | A kind of low voltage ride through device based on supercapacitor group |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105470967A CN105470967A (en) | 2016-04-06 |
| CN105470967B true CN105470967B (en) | 2018-11-20 |
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| CN201610014202.0A Active CN105470967B (en) | 2016-01-11 | 2016-01-11 | A kind of low voltage ride through device based on supercapacitor group |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201742107U (en) * | 2010-08-03 | 2011-02-09 | 大连理工大学 | Power quality regulating device based on stored energy of super capacitor |
| CN104993520A (en) * | 2015-07-30 | 2015-10-21 | 国网浙江省电力公司电力科学研究院 | Frequency converter low-voltage ride-through (LVRT) supporting apparatus based on super capacitor |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6099951B2 (en) * | 2012-11-29 | 2017-03-22 | 株式会社東芝 | Power converter |
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2016
- 2016-01-11 CN CN201610014202.0A patent/CN105470967B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201742107U (en) * | 2010-08-03 | 2011-02-09 | 大连理工大学 | Power quality regulating device based on stored energy of super capacitor |
| CN104993520A (en) * | 2015-07-30 | 2015-10-21 | 国网浙江省电力公司电力科学研究院 | Frequency converter low-voltage ride-through (LVRT) supporting apparatus based on super capacitor |
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| Publication number | Publication date |
|---|---|
| CN105470967A (en) | 2016-04-06 |
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Inventor after: Wang Sue Inventor after: Zhu Ran Inventor after: Hu Yicheng Inventor after: Ji Yawei Inventor after: Wang Kelei Inventor before: Wang Sue Inventor before: Zhu Ran Inventor before: Hu Yicheng Inventor before: Hu Yawei Inventor before: Wang Kelei |
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