CN107359639A - A kind of method for improving air preheater low voltage ride-through capability - Google Patents
A kind of method for improving air preheater low voltage ride-through capability Download PDFInfo
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- CN107359639A CN107359639A CN201710540436.3A CN201710540436A CN107359639A CN 107359639 A CN107359639 A CN 107359639A CN 201710540436 A CN201710540436 A CN 201710540436A CN 107359639 A CN107359639 A CN 107359639A
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- China
- Prior art keywords
- voltage
- air preheater
- modules
- variable resistor
- low voltage
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Classifications
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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
- H02J3/381—Dispersed generators
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Air Supply (AREA)
Abstract
The present invention relates to a kind of method for improving air preheater low voltage ride-through capability, including step to have：Low voltage crossing optimization module is connected between air preheater and virtual voltage, the low voltage crossing optimization module includes being used for the Δ V modules for judging link, Δ V modules are connected with air preheater and virtual voltage, constantly judge the difference DELTA V of air preheater voltage and virtual voltage, air preheater is connected by Δ V modules with variable resistor, variable resistor is directly superimposed upon on air preheater, change variable resistor resistance regulation air preheater voltage, air preheater is connected by Δ V modules with supply voltage, supply voltage is to air preheater progress voltage compensation, and, the variable resistor is provided with bound.The present invention reduces the voltage deviation during regulation on the basis of voltage compensation is completed, and improves unit safety, does not cause the great fluctuation process of unit parameter.
Description
Technical field
The invention belongs to Automatic Generation Control technical field, particularly a kind of side for improving air preheater low voltage ride-through capability
Method.
Background technology
Low voltage crossing (LVRT (The low voltage ride through)) ability is transported safely as Power Plant
Transient state, dynamic or long time power inlet wire electricity caused by capable guarantee, frequency converter and supply object device external failure or disturbance
Pressure be reduced to as defined in low voltage crossing area when, can reliable power supply, ensure the safe operation of supply object.Voltage dip is
Refer to that rms voltage under the conditions of power frequency is reduced between 0.1---0.9 times of rated voltage, the duration is 0.5 cycle (with me
State power frequency 50HZ is calculated, and 1 cycle is 20 milliseconds) to the short time variation in voltage phenomenon of 1 minute.The amplitude of voltage dip and it is lasting when
Between be most important two characteristic quantities that nominal voltage temporarily drops.Voltage dip is that one kind two dimension harassing and wrecking in power network are electrically existing in fact
As that can not eliminate, can but shift to an earlier date pre-add safeguard measure, reduce loss.
At present, the connected mode of air preheater is as shown in figure 1, to improve air preheater reliability of operation, to unit air preheater
Low voltage ride-through capability is verified and transformation, improves unit low voltage ride-through capability, to ensureing that network system and fired power generating unit are stable
Run significant.
The content of the invention
The purpose of the present invention is in view of the shortcomings of the prior art, and to propose a kind of to improve air preheater low voltage ride-through capability
Method.
The present invention solves its technical problem and takes following technical scheme to realize：
A kind of method for improving air preheater low voltage ride-through capability, including step are as follows：
(1) low voltage crossing optimization module is connected between air preheater and virtual voltage, the low voltage crossing optimizes mould
Block includes being used for the Δ V modules for judging link, and Δ V modules are connected with air preheater and virtual voltage, constantly judge air preheater voltage
With the difference DELTA V of virtual voltage, air preheater is connected by Δ V modules with variable resistor, and variable resistor is directly superimposed upon air preheater
On, change variable resistor resistance regulation air preheater voltage, air preheater is connected by Δ V modules with supply voltage, and supply voltage is used
To carry out voltage compensation to air preheater；
(2) when air preheater voltage falls, Δ V modules judge the reduction of air preheater voltage, by supply voltage to sky
Pre- device carries out voltage compensation, raises air preheater voltage, reaches the demand of air preheater voltage stabilization；
(3) when air preheater voltage overload, Δ V modules judge that air preheater voltage raises, and now increase variable resistor resistance,
Air preheater voltage is reduced, reaches the demand of voltage stabilization.
Moreover, the variable resistor is provided with bound.
The advantages and positive effects of the present invention are：
1st, the present invention triggers air preheater module, adjusted by quick module immediately when air preheater voltage declines, and accesses
Voltage optimization module.Low voltage ride-through capability overall process will continue on this basis, on the basis of voltage compensation is completed,
Reduce the voltage deviation during regulation.
2nd, the present invention judges that voltage rise and fall are provided with bound, improves unit safety, does not cause the big of unit parameter
Fluctuation.
Brief description of the drawings
Fig. 1 is the voltage-controlled schematic block diagram of air preheater before air preheater optimization；
Fig. 2 is the voltage-controlled schematic block diagram of air preheater after air preheater optimization of the present invention；
Fig. 3 is the logic diagram of low voltage crossing optimization module in the present invention.
Embodiment
The embodiment of the present invention is further described below：It is emphasized that embodiment of the present invention is explanation
Property, rather than it is limited, therefore the present invention is not limited to the embodiment described in embodiment, it is every by this area
The other embodiment that technical staff's technique according to the invention scheme is drawn, also belongs to the scope of protection of the invention.
A kind of method for improving air preheater low voltage ride-through capability, it is as follows that the method comprising the steps of：
(1) low voltage crossing optimization module, as shown in figures 2 and 3, the low electricity are connected between air preheater and virtual voltage
Pressure, which passes through optimization module, to be included being used for the Δ V modules for judging link, and Δ V modules are connected with air preheater and virtual voltage, constantly sentenced
The difference DELTA V of disconnected air preheater voltage and virtual voltage, air preheater are connected by Δ V modules with variable resistor, and variable resistor is direct
It is superimposed upon on air preheater, changes variable resistor resistance regulation air preheater voltage, air preheater is connected by Δ V modules and supply voltage
Connect, supply voltage is to air preheater progress voltage compensation；
(2) when air preheater voltage falls, Δ V modules judge the reduction of air preheater voltage, by supply voltage to sky
Pre- device carries out voltage compensation, raises air preheater voltage, reaches the demand of air preheater voltage stabilization；
(3) when air preheater voltage overload, Δ V modules judge that air preheater voltage raises, and now increase variable resistor resistance,
Air preheater voltage is reduced, reaches the demand of voltage stabilization.
In the specific implementation of the present invention, the variable resistor is provided with bound, improves unit safety, will not cause machine
The great fluctuation process of group parameter.
Claims (2)
- A kind of 1. method for improving air preheater low voltage ride-through capability, it is characterised in that as follows including step：(1) low voltage crossing optimization module, the low voltage crossing optimization module bag are connected between air preheater and virtual voltage The Δ V modules for judging link are included, Δ V modules are connected with air preheater and virtual voltage, constantly judge air preheater voltage and reality The difference DELTA V of border voltage, air preheater are connected by Δ V modules with variable resistor, and variable resistor is directly superimposed upon on air preheater, is changed Become variable resistor resistance regulation air preheater voltage, air preheater is connected by Δ V modules with supply voltage, and supply voltage is to sky Pre- device carries out voltage compensation；(2) when air preheater voltage falls, Δ V modules judge the reduction of air preheater voltage, by supply voltage to air preheater Voltage compensation is carried out, raises air preheater voltage, reaches the demand of air preheater voltage stabilization；(3) when air preheater voltage overload, Δ V modules judge that air preheater voltage raises, and now increase variable resistor resistance, reduce Air preheater voltage, reach the demand of voltage stabilization.
- 2. the method according to claim 1 for improving air preheater low voltage ride-through capability, it is characterised in that：It is described can power transformation Resistance is provided with bound.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710540436.3A CN107359639A (en) | 2017-07-05 | 2017-07-05 | A kind of method for improving air preheater low voltage ride-through capability |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710540436.3A CN107359639A (en) | 2017-07-05 | 2017-07-05 | A kind of method for improving air preheater low voltage ride-through capability |
Publications (1)
| Publication Number | Publication Date |
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| CN107359639A true CN107359639A (en) | 2017-11-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710540436.3A Pending CN107359639A (en) | 2017-07-05 | 2017-07-05 | A kind of method for improving air preheater low voltage ride-through capability |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203466765U (en) * | 2013-06-13 | 2014-03-05 | 大唐黑龙江发电有限公司哈尔滨第一热电厂 | Boiler air pre-heater frequency converter based on low-voltage ride-through device |
| CN105334412A (en) * | 2015-10-13 | 2016-02-17 | 国网安徽省电力公司 | Auxiliary machine high/low voltage rid-through test method based on voltage disturbance generator |
| CN106020308A (en) * | 2016-07-05 | 2016-10-12 | 国网天津市电力公司 | Method for improving low voltage ride-through capability of coal feeder |
-
2017
- 2017-07-05 CN CN201710540436.3A patent/CN107359639A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203466765U (en) * | 2013-06-13 | 2014-03-05 | 大唐黑龙江发电有限公司哈尔滨第一热电厂 | Boiler air pre-heater frequency converter based on low-voltage ride-through device |
| CN105334412A (en) * | 2015-10-13 | 2016-02-17 | 国网安徽省电力公司 | Auxiliary machine high/low voltage rid-through test method based on voltage disturbance generator |
| CN106020308A (en) * | 2016-07-05 | 2016-10-12 | 国网天津市电力公司 | Method for improving low voltage ride-through capability of coal feeder |
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| SE01 | Entry into force of request for substantive examination | ||
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20171117 |