CN107465203B - A kind of adaptive cooperation method of power grid frequency modulation mode - Google Patents
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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
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Abstract
The invention discloses a kind of adaptive cooperation methods of power grid frequency modulation mode, comprising the following steps: step 1 determines initial configuration parameters；Step 2, setting trigger condition；When the real-time grid frequency value F monitored by AGC systemAGCMore than frequency modulation increase in demand thresholding Thda, and when after frequency modulation trigger threshold time Tact still above the thresholding, triggering frequency increases event；Work as FAGCWhen reducing thresholding Thdb lower than frequency modulation demand, and still being below the thresholding after frequency modulation trigger threshold time Tact, triggering frequency reduces event；Step 3, according to frequency fluctuation event, a situation arises, and dynamic adjusts the value that frequency modulation demand reduces thresholding and Fnow, presets mode of frequency regulation according to the corresponding frequency range of various mode of frequency regulation and the value of Fnow, realizes the adaptive cooperation of mode of frequency regulation.The present invention can have preferable frequency stability in the frequency modulation of different mains frequency deviations.
Description
Technical field
The invention belongs to power engineering field more particularly to a kind of adaptive cooperation methods of power grid frequency modulation mode.
Background technique
In recent years, as power grid scale constantly expands, load increases, and load moment changes, Power System Disturbances frequency
It is all further serious with amplitude, tremendous influence is brought to the normal operation and living standards of the people of power grid.
To solve, frequency fluctuation exceeds unbalanced power caused by regulation after power grid disturbs and its frequency unstability is asked
Topic, both at home and abroad has conducted extensive research power grid frequency modulation problem, and propose many power grid frequency modulation modes.Occur in electric system
After disturbance in the case of frequency response, frequently with mode of frequency regulation be primary frequency modulation, frequency modulation frequency modulation and frequency modulation three times.Wherein generator
Primary frequency modulation acted within 30 seconds frequency variation periods, and frequency modulation frequency modulation acted in 30 seconds to 30 minutes frequency variation period,
Three times fm role frequency accident generation before 1 hour.
The target of primary frequency modulation is that load variations are made with quick response, reduces the deviation of frequency and rated value, and is passed through
Control small as far as possible is carried out to governor and prime mover valve event amount to carry out drawing high for mains frequency.Such method is that have difference
It adjusts, system frequency is pulled up to a higher steady state value, but can not be restored to original frequency level.
The target of frequency modulation frequency modulation uses to be not up to power grid regulation nominal range when the steady-state value that mains frequency restores
AGC adjusts to continue to draw high frequency to power grid regulation nominal range, and make between Grid Tie line Power close to
The rated value of mains frequency.Method is non differential regulation in this, and system frequency can be kept precisely constant value.
Three times the target of frequency modulation be under the premise of meeting power system frequency stable and system safety, with minimum power generation at
This or the goal of cost coordinate the power output of the load between each generating set by control centre, realize electrical network economy distribution, stablize fortune
Row completes on-line economic dispatch.The time scale longest of such means, about hour grade, belong to scheduling scope.
It can be seen that primary frequency modulation, frequency modulation frequency modulation, the adjusting target, regulating measure of frequency modulation are different three times, at three kinds of power grid
When frequency modulation means all put into operation, the phenomenon that will cause the conflict of three kinds of mode of frequency regulation, demodulate, not only weaken the control of other side mutually
Effect processed, and cause the meaningless abrasion of equipment；Therefore, it is necessary to which designing one kind considers that the excellent of various mode of frequency regulation lacks comprehensively
Point, thus the adaptive cooperation method of the power grid frequency modulation mode for being optimal frequency modulation effect.
Summary of the invention
Technical problem solved by the invention is in view of the deficiencies of the prior art, it is adaptive to provide a kind of power grid frequency modulation mode
Cooperation method is answered, can all have preferable frequency stability in the frequency modulation of different mains frequency deviations.
To achieve the above object, technical solution provided by the present invention are as follows:
A kind of adaptive cooperation method of power grid frequency modulation mode, comprising the following steps:
Step 1 determines initial configuration parameters；Specifically includes the following steps:
The step 1 specifically:
Step 101 determines the frequency range that electric system allows, and according to its maximum value and minimum value, sets one by small
To the frequency array MaxFrequencyArray to sort greatly, it is denoted as MaxFrequencyArray=[A0,A1,A2,...,AM],
Wherein A0,A1,A2..., AMIndicate the separation values in the frequency range that electric system allows；Determine various mode of frequency regulation
Corresponding frequency range；Maximum value Fmax >=the A for the frequency range that electric system allowsM；
Step 102 determines that frequency setting value Fnow, Fnow=Aj, j when frequency fluctuation event occurs are initialized as 0 to M
Between any one；
Step 103, configuration frequency modulation increase in demand thresholding Thda and frequency modulation demand reduce thresholding Thdb, and Thda≤Fmax,
Thdb<Thda；
Step 104, setting frequency modulation trigger threshold time Tact；
Step 2, setting trigger condition: when the real-time grid frequency value F monitored by AGC systemAGCMore than frequency modulation demand
Increase thresholding Thda, and when after frequency modulation trigger threshold time Tact still above the thresholding, triggering frequency increases event；
Work as FAGCWhen reducing thresholding Thdb lower than frequency modulation demand, and still being below the thresholding after frequency modulation trigger threshold time Tact,
It triggers frequency and reduces event；
Step 3, according to frequency fluctuation event, a situation arises, and dynamic adjusts the value that frequency modulation demand reduces thresholding and Fnow, real
The adaptive cooperation of existing mode of frequency regulation；Specifically include following sub-step:
Step 301 judges whether there is frequency fluctuation event (including frequency increases event and frequency reduces event) generation, such as
Fruit thens follow the steps 302, otherwise waits for certain time and is judged again；
Step 302 judges whether it is frequency and increases event, no to then follow the steps 305 if it is thening follow the steps 303；
Step 303 judges whether j+1 is greater than or equal to M, no to then follow the steps 308 if it is thening follow the steps 304；
Step 304 updates j=M, then updates Fnow=Aj, Thdb=A(j-1), then execute step 309；
Step 305 judges whether j-1 is less than or equal to 0, no to then follow the steps 307 if it is thening follow the steps 306；
Step 306 updates j=0, then updates Fnow=Aj, then execute step 309；
Step 307 updates j=j-1, then updates Fnow=Aj, Thdb=A(j-1), then execute step 309；
Step 308 updates j=j+1, then updates Fnow=Aj, Thdb=A(j-1), then execute step 309；
Step 309 presets frequency modulation side according to the corresponding frequency range of mode of frequency regulation various in step 101 and the value of Fnow
Formula, electric system carry out frequency control using the preset mode of frequency regulation；Then return step 300；
Wherein preset mode of frequency regulation method are as follows: judge the value of Fnow in the corresponding frequency range of which kind of mode of frequency regulation,
Then select which kind of mode of frequency regulation as default mode of frequency regulation.
Further, in the step 101, according to national standard GB/T 15945-1995, " power quality power system frequency is permitted
Perhaps deviation " standard, electric system reference frequency is 50Hz, and electric system normal frequency deviation allowable value is ± 0.2Hz, thus really
The frequency range for determining electric system permission is 50 ± 0.2Hz, the maximum value Fmax=for the frequency range that electric system allows
50.2Hz；
Further, in the step 101, the mode of frequency regulation includes primary frequency modulation, frequency modulation frequency modulation and frequency modulation three times.
Criterion is adjusted according to power system frequency, the corresponding frequency range of primary frequency modulation is 50 ± 0.05Hz, frequency modulation frequency modulation
Corresponding frequency range is 50 ± 0.1Hz, and the corresponding frequency range of frequency modulation is 50 ± 0.2Hz three times；In order to more sensitively sentence
Disconnected frequency fluctuation range, with 0.05 to divide fine granularity, to one or two three times the corresponding frequency of frequency modulation further segmented, setting
The corresponding frequency range of primary frequency modulation is 50 ± 0.05Hz, and the corresponding frequency range of frequency modulation frequency modulation is 50 ± 0.1Hz, three times frequency modulation
Corresponding frequency range is 50 ± 0.15 and 50 ± 0.2.
Further, it is according to the corresponding frequency range maximum value of various frequency modulation means and minimum value, setpoint frequency array
MaxFrequencyArray=[49.80 49.85 49.90 49.95 50.00 50.05 50.1 50.15 50.2] Hz, i.e.,
M=8.
Further, in the step 309, if the value of Fnow is no more than 50 ± 0.05Hz, primary frequency modulation mode is selected
As default mode of frequency regulation；
If the value of Fnow is more than 50 ± 0.05Hz, it is no more than 50 ± 0.1Hz, then frequency modulation frequency modulation mode is selected to adjust as default
Frequency mode；
If the value of Fnow is more than 50 ± 0.1Hz, be no more than 50 ± 0.2, then select three times mode of frequency regulation as default frequency modulation
Mode.
Further, in the step 104, frequency modulation trigger threshold time Tact=20s is set.
Control process of the invention can be executed by AGC original in electric system, can also individually increase a control
Device executes.
The utility model has the advantages that
A kind of adaptive cooperation method of power grid frequency modulation mode disclosed by the invention adjusts frequency modulation demand by dynamic and subtracts
Few thresholding optimizes frequency modulation demand judgement standard to improve the range of control.Various frequency modulation methods can be efficiently used
Frequency modulation effect is reduced and is wasted, the trigger condition allocation proportion of three kinds of frequency modulation means of flexible configuration, the conflict of inhibition frequency modulation means,
Demodulate phenomenon.
Detailed description of the invention
Fig. 1 is flow chart of the present invention.
Specific embodiment
With reference to the accompanying drawing, technical scheme of the present invention will be described in further detail.
As shown in Figure 1, the invention discloses a kind of adaptive cooperation method of power grid frequency modulation mode, including following step
It is rapid:
Step 1 determines initial configuration parameters；Specifically includes the following steps:
Step 101 determines the frequency range that electric system allows, and according to its maximum value and minimum value, sets one by small
To the frequency array MaxFrequencyArray to sort greatly, it is denoted as MaxFrequencyArray=[A0,A1,A2,...,AM],
Wherein A0,A1,A2..., AMIndicate the separation values in the frequency range that electric system allows；Determine various mode of frequency regulation
Corresponding frequency range；Maximum value Fmax >=the A for the frequency range that electric system allowsM；
In the present embodiment, determine that the frequency range that electric system allows is 50 ± 0.2Hz, the frequency model that electric system allows
The maximum value Fmax=50.2Hz enclosed；Mode of frequency regulation includes primary frequency modulation, frequency modulation frequency modulation and frequency modulation three times；Primary frequency modulation is corresponding
Frequency range is 50 ± 0.05Hz, and the corresponding frequency range of frequency modulation frequency modulation is 50 ± 0.1Hz, three times the corresponding frequency range of frequency modulation
For 50 ± 0.15 and 50 ± 0.2.According to the corresponding frequency range maximum value of various frequency modulation means and minimum value, setpoint frequency array
For MaxFrequencyArray=[49.80 49.85 49.90 49.95 50.00 50.05 50.1 50.15 50.2] Hz,
That is M=8.
Step 102 determines that frequency setting value Fnow, Fnow=Aj, j when frequency fluctuation event occurs are initialized as 0 to M
Between any one；
Step 103, configuration frequency modulation increase in demand thresholding Thda and frequency modulation demand reduce thresholding Thdb, and Thda≤Fmax,
Thdb<Thda；
Step 104, setting frequency modulation trigger threshold time Tact (being that=20s is set as in embodiment)；
Step 2, setting trigger condition；
When the real-time grid frequency value F monitored by AGC systemAGCMore than frequency modulation increase in demand thresholding Thda, and
When after frequency modulation trigger threshold time Tact still above the thresholding, triggering frequency increases event；Work as FAGCSubtract lower than frequency modulation demand
When lacking thresholding Thdb, and still being below the thresholding after frequency modulation trigger threshold time Tact, triggering frequency reduces event；
Step 3, according to frequency fluctuation event, a situation arises, and dynamic adjusts the value that frequency modulation demand reduces thresholding and Fnow, real
The adaptive cooperation of existing mode of frequency regulation；Specifically include following sub-step:
Step 301 judges whether there is the generation of frequency fluctuation event, if there is thening follow the steps 302, otherwise waits for a timing
Between judged again；
Step 302 judges whether it is frequency and increases event, no to then follow the steps 305 if it is thening follow the steps 303；
Step 303 judges whether j+1 is greater than or equal to M, no to then follow the steps 308 if it is thening follow the steps 304；
Step 304 updates j=M, then updates Fnow=Aj, Thdb=A(j-1), then execute step 309；
Step 305 judges whether j-1 is less than or equal to 0, no to then follow the steps 307 if it is thening follow the steps 306；
Step 306 updates j=0, then updates Fnow=Aj, then execute step 309；
Step 307 updates j=j-1, then updates Fnow=Aj, Thdb=A(j-1), then execute step 309；
Step 308 updates j=j+1, then updates Fnow=Aj, Thdb=A(j-1), then execute step 309；
Step 309 presets frequency modulation side according to the corresponding frequency range of mode of frequency regulation various in step 101 and the value of Fnow
Formula, electric system carry out frequency control using the preset mode of frequency regulation；Then return step 300；Wherein preset mode of frequency regulation
Method are as follows: judge the value of Fnow in the corresponding frequency range of which kind of mode of frequency regulation, then select which kind of mode of frequency regulation as pre-
If mode of frequency regulation.
In the present embodiment, if the value of Fnow is no more than 50 ± 0.05Hz, select primary frequency modulation mode as default frequency modulation
Mode；
If the value of Fnow is more than 50 ± 0.05Hz, it is no more than 50 ± 0.1Hz, then frequency modulation frequency modulation mode is selected to adjust as default
Frequency mode.
If the value of Fnow is more than 50 ± 0.1Hz, be no more than 50 ± 0.2, then select three times mode of frequency regulation as default frequency modulation
Mode.
The present invention adjusts frequency modulation demand by dynamic and reduces thresholding, optimizes frequency modulation demand judgement standard to improve control
The range of system；The frequency modulation effect of various frequency modulation methods can be efficiently used, waste, the touching of three kinds of frequency modulation means of flexible configuration are reduced
Clockwork spring part allocation proportion inhibits the conflict of frequency modulation means, demodulates phenomenon.
Claims (7)
1. a kind of adaptive cooperation method of power grid frequency modulation mode, which comprises the following steps:
Step 1 determines initial configuration parameters；Specifically includes the following steps:
Step 101 determines the frequency range that electric system allows, and according to its maximum value and minimum value, setting one is from small to large
The frequency array MaxFrequencyArray of sequence, is denoted as MaxFrequencyArray=[A0,A1,A2,...,AM], wherein
A0,A1,A2..., AMIndicate the separation values in the frequency range that electric system allows；Determine that various mode of frequency regulation are corresponding
Frequency range；Maximum value Fmax >=the A for the frequency range that electric system allowsM；
Step 102 determines that frequency setting value Fnow, Fnow=Aj, j when frequency fluctuation event occurs are initialized as 0 between M
Any one；
Step 103, configuration frequency modulation increase in demand thresholding Thda and frequency modulation demand reduction thresholding Thdb, and Thda≤Fmax, Thdb <
Thda；
Step 104, setting frequency modulation trigger threshold time Tact；
Step 2, setting trigger condition；
When the real-time grid frequency value F monitored by AGC systemAGCMore than frequency modulation increase in demand thresholding Thda, and in frequency modulation
When after trigger threshold time Tact still above the thresholding, triggering frequency increases event；Work as FAGCDoor is reduced lower than frequency modulation demand
When limiting Thdb, and still being below the thresholding after frequency modulation trigger threshold time Tact, triggering frequency reduces event；
Step 3, according to frequency fluctuation event, a situation arises, and dynamic adjusts the value that frequency modulation demand reduces thresholding and Fnow, realizes and adjusts
The adaptive cooperation of frequency mode；Specifically include following sub-step:
Step 301 judges whether there is the generation of frequency fluctuation event, if there is thening follow the steps 302, otherwise waits for certain time again
It is secondary to be judged；
Step 302 judges whether it is frequency and increases event, no to then follow the steps 305 if it is thening follow the steps 303；
Step 303 judges whether j+1 is greater than or equal to M, no to then follow the steps 308 if it is thening follow the steps 304；
Step 304 updates j=M, then updates Fnow=Aj, Thdb=A(j-1), then execute step 309；
Step 305 judges whether j-1 is less than or equal to 0, no to then follow the steps 307 if it is thening follow the steps 306；
Step 306 updates j=0, then updates Fnow=Aj, then execute step 309；
Step 307 updates j=j-1, then updates Fnow=Aj, Thdb=A(j-1), then execute step 309；
Step 308 updates j=j+1, then updates Fnow=Aj, Thdb=A(j-1), then execute step 309；
Step 309 presets mode of frequency regulation according to the corresponding frequency range of mode of frequency regulation various in step 101 and the value of Fnow,
Electric system carries out frequency control using the preset mode of frequency regulation；Then return step 301；
Wherein preset the method for mode of frequency regulation are as follows: judge that the value of Fnow in the corresponding frequency range of which kind of mode of frequency regulation, is then selected
Which kind of mode of frequency regulation is selected as default mode of frequency regulation.
2. the adaptive cooperation method of power grid frequency modulation mode according to claim 1, which is characterized in that the step
In 101, determine that the frequency range that electric system allows is 50 ± 0.2Hz, the maximum value for the frequency range that electric system allows
Fmax=50.2Hz.
3. the adaptive cooperation method of power grid frequency modulation mode according to claim 2, which is characterized in that the step
In 101, the mode of frequency regulation includes primary frequency modulation, frequency modulation frequency modulation and frequency modulation three times.
4. the adaptive cooperation method of power grid frequency modulation mode according to claim 3, the corresponding frequency model of primary frequency modulation
Enclose for 50 ± 0.05Hz, the corresponding frequency range of frequency modulation frequency modulation is 50 ± 0.1Hz, three times the corresponding frequency range of frequency modulation be 50 ±
0.2Hz。
5. the adaptive cooperation method of power grid frequency modulation mode according to claim 4, corresponding according to various frequency modulation means
Frequency range maximum value and minimum value, and be to divide fine granularity with 0.05Hz, setpoint frequency array is
MaxFrequencyArray=[49.80 49.85 49.90 49.95 50.00 50.05 50.1 50.15 50.2] Hz, i.e.,
M=8.
6. the adaptive cooperation method of power grid frequency modulation mode according to claim 5, which is characterized in that the step
In 309, if the value of Fnow is no more than 50 ± 0.05Hz, select primary frequency modulation mode as default mode of frequency regulation；
If the value of Fnow is more than 50 ± 0.05Hz, it is no more than 50 ± 0.1Hz, then selects frequency modulation frequency modulation mode as default frequency modulation side
Formula；
If the value of Fnow is more than 50 ± 0.1Hz, be no more than 50 ± 0.2Hz, then select three times mode of frequency regulation as default frequency modulation side
Formula.
7. the adaptive cooperation method of power grid frequency modulation mode described according to claim 1~any one of 6, feature exist
In, in the step 104, setting frequency modulation trigger threshold time Tact=20s.
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| CN103166242A (en) * | 2011-12-14 | 2013-06-19 | 湖北省电力公司 | Computing method of generator difference-adjustment coefficient |
| CN103543403A (en) * | 2013-09-02 | 2014-01-29 | 国家电网公司 | Method for detecting primary frequency modulation capacity of power system units |
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