CN106786811B - A kind of calculation method of thermal power plant's automatic voltage control system pulse width coefficient - Google Patents
A kind of calculation method of thermal power plant's automatic voltage control system pulse width coefficient Download PDFInfo
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- CN106786811B CN106786811B CN201611202704.2A CN201611202704A CN106786811B CN 106786811 B CN106786811 B CN 106786811B CN 201611202704 A CN201611202704 A CN 201611202704A CN 106786811 B CN106786811 B CN 106786811B
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- pulse width
- width coefficient
- regulation
- control system
- automatic 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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/50—Controlling the sharing of the out-of-phase component
Abstract
The invention discloses a kind of calculation methods of thermal power plant's automatic voltage control system pulse width coefficient, comprising the following steps: S1, after automatic voltage control system exports regulation and control instruction to unit saves the relevant information of regulation and control instruction；S2, before the arrival of next regulating cycle, idle work variable quantity maximum reactive power when obtaining unit real time information, and counting output regulation and control instruction, and using statistical result and corresponding regulation and control instruction as newest one group of regulation Sample preservation；S3, preset threshold N；S4, regulate and control sample calculating pulse width coefficient according to the newest N group of preservation.In the present invention, the each regulation and control instruction issued according to automatic voltage control system to unit in unit commitment operational process, the drawbacks of automatically calculating and update the pulse width coefficient of unit in real time, avoiding manual operation is conducive to the computational accuracy and efficiency that improve pulse width coefficient.
Description
Technical field
The present invention relates to thermal power plant's automatism voltage control (AVC) technical field more particularly to a kind of thermal power plant's automatic voltages
The calculation method of control system pulse width coefficient.
Background technique
After automatic voltage control system receives the regulation and control instruction of scheduling station, by certain allocation strategy, it will regulate and control
Target Assignment forms the Target of Reactive Power of unit to each unit, but is unable to direct regulation and control unit, but passes through control unit
AVR indirectly controls the idle power output of unit, this method needs for the corresponding idle increment of Target of Reactive Power to be converted into AVR can be with
The increasing magnetic of identification subtracts magnetic field impulse signal, relates to this patent unit pulse width coefficient of interest at this time, i.e., turns idle increment
It is changed to the coefficient of pulse signal.
The similar products of major part producer mostly use greatly pulse width coefficient the side for carrying out the test of unit pulse width coefficient at present
Method obtains, and is later arranged again into system.The test of unit pulse width coefficient is defeated to the AVR of every unit generally before system puts into operation
The increasing magnetic of certain length or subtract magnetic pulsewidth (pulse signal) out, and observe the idle variable quantity of unit, to calculate the every list of unit
Pulsewidth length corresponding to variation that position is idle.But artificial pulse width coefficient is tested carried out number and is limited, and data
Artificial observation and manual calculations mostly are obtained, so calculated coefficient loses much in precision.In addition the pulsewidth system of unit
Number is also not quite similar when unit is in different conditions or AVR maintenance replacement, and primary test is inadequate, but frequently
Do it is this test be also it is impossible, so there are many drawbacks for this method artificially tested.(
Summary of the invention
Technical problems based on background technology, the invention proposes a kind of thermal power plant's automatic voltage control system pulsewidths
The calculation method of coefficient.
A kind of calculation method of thermal power plant's automatic voltage control system pulse width coefficient proposed by the present invention, including following step
It is rapid:
S1, after automatic voltage control system exports regulation and control instruction to unit, the relevant information of regulation and control instruction is saved；
S2, before the arrival of next regulating cycle, idle change when obtaining unit real time information, and counting output regulation and control instruction
The maximum reactive power of change amount, and using statistical result and corresponding regulation and control instruction as newest one group of regulation Sample preservation；
S3, preset threshold N；
S4, regulate and control sample calculating pulse width coefficient according to the newest N group of preservation.
Preferably, in step S2, if unit has the case where increasing magnetic latch or subtracting magnetic latch, the unit is directly abandoned
The regulation and control instruction relevant information that last time saves.
Preferably, in step S4, sample is regulated and controled according to the newest N group of preservation by the method averaged and calculates pulsewidth
Coefficient.
Preferably, in step S4: N group being regulated and controled the pulsewidth length in sample first and is added, then N group is regulated and controled in sample
The absolute value of idle work variable quantity is added, and the two, which is divided by, obtains pulse width coefficient.
Preferably, further comprising the steps of:
S5, floating difference is set；
S6, the pulse width coefficient of newest acquisition and the last pulse width coefficient obtained sought to difference, and by absolute difference
With floating difference comparsion, it is adjusted according to pulse width coefficient of the comparison result to newest acquisition.
Preferably, in step S6, if difference is greater than floating difference, pulse width coefficient adjusted is equal to last acquisition
It is pulse width coefficient and floating difference and/or poor.
Preferably, further comprising the steps of:
S7, setting pulse width coefficient maximum value and pulse width coefficient minimum value；
S8, it is tied compared with pulse width coefficient maximum value and pulse width coefficient minimum value, and according to comparing respectively according to pulse width coefficient
Fruit carries out limit value to pulse width coefficient and updates.
Preferably, in step S8, when pulse width coefficient be greater than pulse width coefficient maximum value, then pulse width coefficient is updated to pulsewidth system
Number maximum value simultaneously saves；When pulse width coefficient be less than pulse width coefficient minimum value, then pulse width coefficient is updated to pulse width coefficient minimum value
And it saves.
It is the relevant information such as arteries and veins to regulation and control instruction convenient for statistics real time data by saving regulation and control instruction in the present invention
Wide length calls directly；Then, pulse width coefficient is obtained by the average computation of a large amount of sample, automatic electric will be effectively improved
Pressure control system it is practical regulation when speed and precision, avoid the error being likely to occur when artificial test and test of many times band
The trouble come.
In the present invention, referred in unit commitment operational process according to each regulation that automatic voltage control system is issued to unit
It enables, the drawbacks of automatically calculating and update the pulse width coefficient of unit in real time, avoid manual operation, is conducive to improve pulsewidth system
Several computational accuracies and efficiency.
Detailed description of the invention
Fig. 1 is a kind of calculation method flow chart of thermal power plant's automatic voltage control system pulse width coefficient proposed by the present invention.
Specific embodiment
Referring to Fig.1, the calculation method of a kind of thermal power plant's automatic voltage control system pulse width coefficient proposed by the present invention, including
Following steps.
S1, after automatic voltage control system exports regulation and control instruction to unit, the relevant information of regulation and control instruction is saved.
Increasing magnetic arteries and veins in the relevant information of regulation and control instruction comprising pulse signal i.e. to field regulator (AVR) output of unit
Width subtracts magnetic pulsewidth, can directly obtain pulsewidth length in pulse signal.In present embodiment, by saving regulation and control instruction, it is convenient for
Counting real time data is calling directly to the relevant information such as pulsewidth length of regulation and control instruction.
S2, before the arrival of next regulating cycle, idle change when obtaining unit real time information, and counting output regulation and control instruction
The maximum reactive power of change amount, and using statistical result and corresponding regulation and control instruction as newest one group of regulation Sample preservation.
In this step, statistical result is idle work variable quantity maximum reactive power when exporting regulation and control instruction.It is best and in this step
When next regulating cycle reaches, regulation sample was saved, so that the real time data to a upper period counts comprehensive.
In this step, if unit has the case where increasing magnetic latch or subtracting magnetic latch, the unit last time is directly abandoned
The regulation and control instruction relevant information of preservation abandons the analysis regulated and controled to last time, can effectively avoid increasing and decreasing magnetic because of unit in this way
The case where locking causes regulation and control instruction that can not execute in place reduces the adverse effect calculated pulse width coefficient.
S3, preset threshold N.Threshold value N in this step is the positive integer greater than 2, can be determined according to the actual situation.
S4, sample calculating pulse width coefficient is regulated and controled according to the newest N group of preservation by the method averaged.This step tool
Body are as follows: N group is regulated and controled into the pulsewidth length in sample first and is added the sum of acquisition length, then N group is regulated and controled into the idle change in sample
The sum of the absolute value addition acquisition of change amount is idle, then by the sum of length divided by the sum of idle acquisition pulse width coefficient.
In this step, pulse width coefficient is obtained by the average computation of a large amount of sample, it is voltage-controlled by automatic electric is effectively improved
Speed and precision when the practical regulation of system processed, avoids the error being likely to occur when artificial test and test of many times bring
Trouble.
S5, floating difference is set.
S6, the pulse width coefficient of newest acquisition and the last pulse width coefficient obtained sought to difference, and by absolute difference
With floating difference comparsion, it is adjusted according to pulse width coefficient of the comparison result to newest acquisition.Specifically, if difference is less than or waits
In floating difference, then pulse width coefficient adjusted is equal to newest pulse width coefficient；If difference is greater than floating difference, pulsewidth adjusted
Coefficient is equal to the last pulse width coefficient obtained and floating difference and/or poor.When difference is greater than floating difference, if newest acquisition
Pulse width coefficient is greater than the last pulse width coefficient obtained, then the pulse width coefficient of newest acquisition is adjusted to the pulsewidth system of last acquisition
The sum of several and floating difference；If the pulse width coefficient of newest acquisition is less than the last pulse width coefficient obtained, the arteries and veins of newest acquisition
Wide coefficient adjustment is the difference of the last pulse width coefficient obtained and floating difference.
S7, setting pulse width coefficient maximum value and pulse width coefficient minimum value.
S8, it is tied compared with pulse width coefficient maximum value and pulse width coefficient minimum value, and according to comparing respectively according to pulse width coefficient
Fruit carries out limit value to pulse width coefficient and updates.Specifically, when pulse width coefficient be greater than pulse width coefficient maximum value, then more by pulse width coefficient
Newly it is pulse width coefficient maximum value and saves.When pulse width coefficient be less than pulse width coefficient minimum value, then pulse width coefficient is updated to pulsewidth
Coefficient minimum value simultaneously saves.
In step S6, by seeking the difference of adjacent pulse width coefficient twice, each variation limit value of pulse width coefficient is certain
In the range of, avoid variation excessive the problem of may result in of pulse width coefficient.In step S8, the maximum of pulse width coefficient is set
Value and minimum value, the final pulse width coefficient used can also limit value in the range, further ensure pulse width coefficient calculating
Accurately with safety.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Anyone skilled in the art in the technical scope disclosed by the present invention, according to the technique and scheme of the present invention and its
Inventive concept is subject to equivalent substitution or change, should be covered by the protection scope of the present invention.
Claims (6)
1. a kind of calculation method of thermal power plant's automatic voltage control system pulse width coefficient, which comprises the following steps:
S1, after automatic voltage control system exports regulation and control instruction to unit, the relevant information of regulation and control instruction is saved；
S2, next regulating cycle arrival before, obtain unit real time information, and count output regulation and control instruction when idle work variable quantity
Maximum reactive power, and using statistical result and corresponding regulation and control instruction as newest one group of regulation Sample preservation；
S3, preset threshold N；
S4, regulate and control sample calculating pulse width coefficient according to the newest N group of preservation；
S5, floating difference is set；
S6, the pulse width coefficient of newest acquisition and the last pulse width coefficient obtained are sought into difference, and by absolute difference and floated
Difference comparsion is adjusted according to pulse width coefficient of the comparison result to newest acquisition；
In step S6, if difference is greater than floating difference, pulse width coefficient adjusted be equal to the last pulse width coefficient obtained with
It is floating difference and/or poor.
2. the calculation method of thermal power plant's automatic voltage control system pulse width coefficient as described in claim 1, which is characterized in that step
In rapid S2, if unit has the case where increasing magnetic latch or subtracting magnetic latch, the regulation of unit last time preservation is directly abandoned
Instruct relevant information.
3. the calculation method of thermal power plant's automatic voltage control system pulse width coefficient as described in claim 1, which is characterized in that step
In rapid S4, sample is regulated and controled according to the newest N group of preservation by the method averaged and calculates pulse width coefficient.
4. the calculation method of thermal power plant's automatic voltage control system pulse width coefficient as claimed in claim 3, which is characterized in that step
In rapid S4: N group being regulated and controled the pulsewidth length in sample first and is added, then N group is regulated and controled the absolute of the idle work variable quantity in sample
Value is added, and the two, which is divided by, obtains pulse width coefficient.
5. special such as the calculation method of the described in any item thermal power plant's automatic voltage control system pulse width coefficients of Claims 1-4
Sign is, further comprising the steps of:
S7, setting pulse width coefficient maximum value and pulse width coefficient minimum value；
S8, according to pulse width coefficient respectively compared with pulse width coefficient maximum value and pulse width coefficient minimum value, and according to comparison result pair
Pulse width coefficient carries out limit value and updates.
6. the calculation method of thermal power plant's automatic voltage control system pulse width coefficient as claimed in claim 5, which is characterized in that step
In rapid S8, when pulse width coefficient is greater than pulse width coefficient maximum value, then pulse width coefficient is updated to pulse width coefficient maximum value and saved；When
Pulse width coefficient is less than pulse width coefficient minimum value, then pulse width coefficient is updated to pulse width coefficient minimum value and saved.
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| JP2564306B2 (en) * | 1987-05-27 | 1996-12-18 | 株式会社日立製作所 | Excitation controller for synchronous generator |
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| CN101604950B (en) * | 2009-07-06 | 2011-05-25 | 西安陕鼓动力股份有限公司 | Automatic adjusting method for a top gas pressure recovery turbine (TRT) excitation system before grid connection |
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Non-Patent Citations (2)
| Title |
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| 发电厂无功电压自动控制（AVC）系统建设;刘斌;《全国火电大机组（600MW级）竞赛第11街年会论文集》;20070531;第81-86页 |
| 电压无功自动控制系统在惠州燃气电厂的应用;谭活;《中国优秀硕士学位论文全文数据库 工程科技II辑》;20111215;第C042-198页 |
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