CN114784824B - Control method for primary frequency modulation priority action based on power grid large frequency difference - Google Patents
Control method for primary frequency modulation priority action based on power grid large frequency difference Download PDFInfo
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- CN114784824B CN114784824B CN202210487951.0A CN202210487951A CN114784824B CN 114784824 B CN114784824 B CN 114784824B CN 202210487951 A CN202210487951 A CN 202210487951A CN 114784824 B CN114784824 B CN 114784824B
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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
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
- H02J3/241—The oscillation concerning frequency
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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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
- Y02B70/3225—Demand response systems, e.g. load shedding, peak shaving
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
- Y04S20/222—Demand response systems, e.g. load shedding, peak shaving
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Abstract
The invention discloses a control method of primary frequency modulation priority action based on power grid large frequency difference, wherein after a frequency modulation device changes to a maximum value according to requirements, the frequency modulation effect is continuously maintained until the power grid frequency is recovered; in the process of frequency recovery, the frequency modulation effect is recovered with the frequency deviation at a slower speed; the fast-acting slow-return module judges a locking reduction condition through the direction locking module, forbids or limits a regulating action reverse to frequency recovery, even if the frequency modulation power variation of the unit exceeds a required value or the unit is in a power grid frequency recovery process, the regulating action reverse to the frequency deviation reduction cannot be generated, and the regulation is finished until the power grid frequency deviation is smaller than a recovery value, so that more frequency modulation electric quantity is contributed. According to the invention, the contribution electric quantity index of the primary frequency modulation action is improved through the functions of quick action slow return and direction locking, so that the rapidness and the accuracy of the primary frequency modulation action are ensured, and the output response index and the electric quantity contribution index after the primary frequency modulation action are fully improved.
Description
Technical Field
The invention relates to the technical field of thermal control automation control, in particular to a control method based on primary frequency modulation priority action when the power grid has large frequency difference, and the control method aims at improving the contribution electric quantity of the primary frequency modulation action when the power grid has large frequency difference.
Background
With the increasing installation proportion of new energy on the grid, the frequency modulation pressure of the power grid is becoming more and more serious due to the volatility and randomness of intermittent new energy such as wind power, photovoltaic and the like, particularly, the characteristics of the power grid system in east China are deeply changed due to the access of an extra-high voltage transmission project, the frequency quality of the power grid is improved, and the frequency modulation task for helping the frequency recovery of the power grid can only depend on a thermal power generating unit to a great extent. When the thermal power generating unit is put into primary frequency modulation and AGC functions, the contribution electric quantity of primary frequency modulation action is often insufficient, and large-amplitude and continuous frequency modulation output required by primary frequency modulation under large frequency difference cannot be met. At the moment, according to the related requirements of a power grid dispatching rule (two detailed rules), and in order to improve the output response index and the electric quantity contribution index after the primary frequency modulation action, the action requirement of the primary frequency modulation should be preferentially met.
Disclosure of Invention
The invention aims to make up for the defects of the prior art, and provides a control method of primary frequency modulation priority action based on power grid large frequency difference.
The invention is realized by the following technical scheme:
a control method for primary frequency modulation priority action based on power grid large frequency difference comprises the following specific steps:
(1) Quick-action slow-return module: in the whole frequency modulation process, after the frequency modulation device changes to the maximum value according to the requirement, the frequency modulation effect is continuously maintained until the frequency of the power grid is recovered; in the process of frequency recovery, the frequency modulation effect is recovered with the frequency deviation at a slower speed; the fast-acting slow-returning module provides more frequency modulation electric quantity through keeping and decelerating in the frequency recovery process, and avoids the frequency modulation device from reciprocating change along with the frequency;
(2) A direction locking module: the fast-acting slow-return module judges the locking reduction condition through the direction locking module, forbids or limits the adjustment action reverse to the frequency recovery, even if the variable quantity of the frequency modulation power of the unit exceeds the required value or the unit is in the process of restoring the frequency of the power grid, the adjustment action reverse to the reduction of the frequency deviation cannot be generated, and the adjustment is finished until the frequency deviation of the power grid is smaller than the restoration value, so that more frequency modulation electric quantity is contributed, the oscillation of a frequency modulation device is effectively avoided, and the fast-acting slow-return frequency modulation effect is enhanced.
The method specifically comprises the following steps:
step 1) according to the collection in the DEH system of the unitCalculating the frequency difference of the power grid △ f；
Step 2) if the frequency difference of the power grid △ f, converting the rotating speed into a rotating speed exceeding the dead zone +/-2 r/min, and calculating a primary frequency modulation load instruction H required by the power grid according to the following formula:
in the formula, pe is the rated power of the unit; n is a rated rotating speed; the unequal rate of the rotating speed of the Kc steam turbine;
step 3), the input quantity of the quick-acting slow-return module is a primary frequency modulation load instruction H, and the output quantity is an inertia control quantity H 1 Wherein the inertia control amount H is output 1 Lags behind the input primary frequency modulation load command H; judging the height of the frequency value through a frequency judging module H/L; t1 and T2 are both change-over switches; when the low-frequency primary frequency modulation acts, the frequency modulation component Y input in the load controller selects the high-selection output through the selector switch T1, and the primary frequency modulation load instruction H is increased when the frequency is reduced, wherein H is larger than H 1 Y = H, the frequency modulation rapidly increasing to the power change requirement, H during the frequency ramp back up 1 ＞H，Y＝H 1 Frequency modulation effects are restored at a slower rate; when high-frequency primary frequency modulation action is performed, the frequency modulation component Y input in the load controller selects low-selection output through the selector switch T2, the primary frequency modulation load instruction H is reduced, and H is less than H 1 Y = H, the frequency modulation is rapidly reduced to the power change requirement value, H1 is less than H, Y = H in the process of frequency fallback 1 Frequency modulation effects are restored at a slower rate;
step 4), sending the primary frequency modulation load instruction H obtained by calculation in the step 2) to a load controller in a DCS, judging by a superposition direction locking module, outputting the primary frequency modulation load instruction H serving as a trigger condition of a load change T3 switching function block to a target instruction processing logic of the load controller after a locking reduction condition is activated, setting the deviation between an actual load and the load instruction to be 0 when the trigger condition of the locking reduction condition is 1, reducing the weakening effect of reverse regulation by a frequency modulation component Y input in the load controller, and strengthening the primary frequency modulation load instruction; when the trigger condition of the locking reduction condition is 0, selecting the real-time deviation output of the actual load of the unit and the AGC instruction, and sending the output value to the load controller after the speed limit rate.
The direction locking module is used for judging, and the specific method is as follows: the direction locking module is used for judging the height of the power grid frequency, setting a primary frequency modulation action dead zone as 0.033Hz and a recovery value as 0.01Hz, judging the frequency deviation to generate a low-frequency locking and subtracting signal when the power grid frequency is lower than 49.967Hz, and outputting a locking and subtracting signal; when the frequency of the power grid is recovered to be higher than 49.99Hz, the blocking and reducing effects are released; when the frequency of the power grid is higher than 50.033Hz, a high-frequency close-increase signal is generated in the frequency deviation judgment link.
Frequency difference of the power grid △ f is calculated as follows:
△ f=f-50（Hz）。
the rated rotating speed n is 3000r/min.
The rotating speed unequal rate Kc of the steam turbine is 3-6%.
The invention has the advantages that: the invention limits the primary frequency modulation load instruction of the unit under the large frequency difference working condition of the power grid, increases the frequency modulation output, prolongs the frequency modulation output time, and can effectively reduce the number of door adjustment actions;
on the premise of ensuring the safe operation of the unit, the invention greatly improves the primary frequency modulation performance of the unit with large frequency difference, slows down the oscillation of the frequency modulation device and can effectively reduce the frequency modulation abrasion of the unit.
Drawings
Fig. 1 is a SAMA logic diagram of a control method for priority action of primary frequency modulation based on power grid large frequency difference according to the present invention.
Detailed Description
As shown in fig. 1, a control method for priority action of primary frequency modulation based on power grid large frequency difference specifically includes the following steps:
(1) Quick-action slow-return module: in the whole frequency modulation process, after the frequency modulation device changes to the maximum value according to the requirement, the frequency modulation effect is continuously maintained until the frequency of the power grid is recovered; in the process of frequency recovery, the frequency modulation effect recovers with frequency deviation at a slower speed; the fast-acting slow-returning module provides more frequency modulation electric quantity through keeping and decelerating in the frequency recovery process, and avoids the frequency modulation device from reciprocating change along with the frequency;
(2) A direction locking module: the fast-acting slow-return module judges the locking reduction condition through the direction locking module, forbids or limits the adjustment action reverse to the frequency recovery, even if the variable quantity of the frequency modulation power of the unit exceeds the required value or the unit is in the process of restoring the frequency of the power grid, the adjustment action reverse to the reduction of the frequency deviation cannot be generated, and the adjustment is finished until the frequency deviation of the power grid is smaller than the restoration value, so that more frequency modulation electric quantity is contributed, the oscillation of a frequency modulation device is effectively avoided, and the fast-acting slow-return frequency modulation effect is enhanced.
The method specifically comprises the following steps:
step 1), calculating a power grid frequency difference according to a power grid frequency signal f collected in a unit DEH system △ f；
Step 2) if the frequency difference of the power grid △ f, converting the rotating speed into a rotating speed exceeding the dead zone +/-2 r/min, and calculating a primary frequency modulation load instruction H required by the power grid according to the following formula:
in the formula, pe is the rated power of the unit; n is a rated rotating speed; the rotation speed unequal rate of the Kc steam turbine;
step 3): a 'fast-moving slow-returning' link is added in a frequency modulation loop, the input quantity of the fast-moving slow-returning link is a primary frequency modulation load instruction H, and the output quantity is an inertia control quantity H 1 Wherein the output H 1 Lagging behind the change of input H, wherein H/L is a frequency judgment module used for judging the height of a frequency value; t1 and T2 are both switches. When the low-frequency primary frequency modulation action is carried out, the frequency modulation component Y input in the load controller selects the output of the '> (high selection)' through T1, and H is increased in the process of frequency reduction, wherein H is larger than H 1 Y = H, the frequency modulation rapidly increases to the power change requirement; in the frequency back-up process, H 1 ＞H，Y＝H 1 Frequency modulation is used toAnd a slow rate recovery. When high-frequency primary frequency modulation action is performed, the frequency modulation component Y input in the load controller selects output of < (low selection) > through T2, H is reduced, and H < H 1 Y = H, the frequency modulation action is rapidly reduced to the power change requirement value; in the process of frequency falling back, H1 is less than H, Y = H 1 The frequency modulation recovers at a slower rate.
Step 4): after the locking reduction condition is activated, outputting the triggering condition of the switching function block of the load change T3 to a target instruction processing logic of the load controller, and when the triggering condition of the locking reduction condition is 1, setting the deviation between the actual load and the load instruction to be 0 and outputting the deviation, so that the primary frequency modulation load instruction is strengthened; when the trigger condition of the locking and reducing condition is 0, the deviation between the actual load of the selected unit and the AGC instruction is sent to the load controller after the speed limit rate, and in the reverse locking module, T3 is used as a load change switching module, and the preset switching rates are different, so that the oscillation of the frequency modulation device is effectively slowed down.
The direction locking judgment link is used for judging the frequency of the power grid, a primary frequency modulation action dead zone is set to be 0.033Hz, a recovery value is set to be 0.01Hz, when the frequency of the power grid is lower than 49.967Hz, the frequency deviation is judged to generate a low-frequency locking and reducing signal, and the locking and reducing signal is output; when the frequency of the power grid is restored to be higher than 49.99Hz, the 'locking and reducing' effects are released; when the frequency of the power grid is higher than 50.033Hz, a high-frequency close-increase signal is generated in the frequency deviation judgment link.
Frequency difference of the power grid △ f is calculated as follows:
△ f=f-50（Hz）。
the rated rotating speed n is 3000r/min.
The rotating speed unequal rate Kc of the steam turbine is 3-6%.
The first embodiment is as follows: (1) Calculating the frequency difference of the power grid according to the power grid frequency signal f acquired in the DCS of the unit △ f, when the frequency difference of the power grid exceeds-0.05 Hz, triggering the quick-action slow-return module, wherein the primary frequency modulation load instruction H is carried out at the moment, and the output quantity is the inertia control quantity H 1 Wherein the output H 1 Lagging behind the change of the input H, H/L is a frequency judging module which is used for judging the height of the frequency value.T1 and T2 are both switches. When the low-frequency primary frequency modulation action is carried out, the frequency modulation component Y input in the load controller selects the output of the '> (high selection)' through T1, and H is increased in the process of frequency reduction, wherein H is larger than H 1 Y = H, the frequency modulation increases rapidly to the power change requirement. In the frequency back-up process, H 1 ＞H，Y＝H 1 Frequency modulation effects are restored at a slower rate;
(2) Frequency difference subtracted from rated speed n of steam turbine △ f, calculating a rotating speed deviation through a conversion value of the proportion module K, triggering a reverse locking function when the rotating speed deviation value is larger than 2r/min, wherein the triggering condition of the reverse locking condition is 1, switching the load change T3 module according to a preset variable load rate to switch an output value, setting the deviation between an actual load and a load instruction to be 0 and outputting the value, and strengthening a primary frequency modulation load instruction. In the frequency rising process, when the rotating speed deviation value is less than 2r/min and the triggering condition of the locking condition is 0, the load change T3 module selects the deviation between the actual load of the unit and the AGC instruction and sends the deviation to the load controller after the speed limit rate.
Example two: (1): on the basis of the first embodiment, the power grid frequency difference is calculated according to the power grid frequency signal f collected in the unit DCS system △ f, when the frequency difference of the power grid exceeds 0.05Hz, triggering the quick-action slow-return module, wherein the primary frequency modulation load instruction H is carried out at the moment, and the output quantity is the inertia control quantity H 1 Wherein the output H 1 Lagging behind the change of the input H, H/L is a frequency judging module which is used for judging the height of the frequency value. T1 and T2 are both switches. When high-frequency primary frequency modulation action is performed, the frequency modulation component Y input in the load controller selects output of < (low selection) > through T2, H is reduced, and H < H 1 Y = H, the frequency modulation is rapidly reduced to the power change requirement. In the process of frequency falling back, H1 is less than H, Y = H 1 Frequency modulation resumes at a slower rate;
(2): frequency difference subtracted from rated speed n of steam turbine △ f, calculating the rotation speed deviation through the conversion value of the proportion module K, triggering a reverse locking function when the rotation speed deviation value is less than-2 r/min, wherein the triggering condition of the reverse locking condition is 1, and switching the load change T3 module according to the preset variable load rateAnd switching the output value, setting the deviation between the actual load and the load instruction to be 0 and outputting, and strengthening the primary frequency modulation load instruction. In the process of frequency reduction, when the rotating speed deviation value is greater than-2 r/min and the triggering condition of the locking condition is 0, the load change T3 module selects the deviation between the actual load of the unit and the AGC instruction and sends the deviation to the load controller after the speed limit rate.
Claims (5)
1. A control method based on primary frequency modulation priority action during large frequency difference of a power grid is characterized by comprising the following steps: the specific method comprises the following steps:
(1) Fast-acting slow-return module: in the whole frequency modulation process, after the frequency modulation device changes to the maximum value according to the requirement, the frequency modulation effect is continuously maintained until the frequency of the power grid is recovered; in the process of frequency recovery, the frequency modulation effect is recovered with the frequency deviation at a slower speed;
(2) A direction locking module: the fast-acting slow-return module judges a locking reduction condition through the direction locking module, forbids or limits a regulating action reverse to the frequency recovery, even if the frequency modulation power variation of the unit exceeds a required value or the unit is in the process of power grid frequency recovery, the regulating action reverse to the frequency deviation reduction is not generated, and the regulation is finished until the power grid frequency deviation is smaller than a recovery value, so that more frequency modulation electric quantity is contributed;
the control method of the primary frequency modulation priority action based on the power grid large frequency difference specifically comprises the following steps:
step 1), calculating a power grid frequency difference according to a power grid frequency signal f collected in a unit DEH system △ f；
Step 2) if the frequency difference of the power grid △ f, converting the rotating speed into a rotating speed exceeding the dead zone +/-2 r/min, and calculating a primary frequency modulation load instruction H required by the power grid according to the following formula:
in the formula, pe is the rated power of the unit; n is a rated rotating speed; the unequal rate of the rotating speed of the Kc steam turbine;
step 3), the input quantity of the fast-acting slow-returning module is a primary frequency modulation load instruction H, and the output quantity is an inertia control quantity H 1 Wherein the inertia control amount H is output 1 Lags behind the input primary frequency modulation load command H; judging the height of the frequency value through a frequency judging module H/L; t1 and T2 are both change-over switches; when the low-frequency primary frequency modulation acts, the frequency modulation component Y input in the load controller selects the high-selection output through the selector switch T1, and in the process of frequency reduction, the primary frequency modulation load instruction H is increased, wherein H is more than H 1 Y = H, the frequency modulation rapidly increasing to the power change requirement, H during the frequency ramp back up 1 ＞H，Y＝H 1 Frequency modulation resumes at a slower rate; when high-frequency primary frequency modulation action is performed, the frequency modulation component Y input in the load controller selects low-selection output through the selector switch T2, the primary frequency modulation load instruction H is reduced, and H is less than H 1 Y = H, the frequency modulation is rapidly reduced to the power change requirement value, H1 is less than H, Y = H in the process of frequency fallback 1 Frequency modulation effects are restored at a slower rate;
step 4), sending the primary frequency modulation load instruction H obtained by calculation in the step 2) to a load controller in a DCS, judging by a superposition direction locking module, outputting the primary frequency modulation load instruction H serving as a trigger condition of a load change T switching function block to a target instruction processing logic of the load controller after a locking reduction condition is activated, selecting a Y loop to output when the trigger condition of the locking reduction condition is 1, setting the deviation between an actual load and the load instruction to be 0, and strengthening the primary frequency modulation load instruction; and when the triggering condition of the locking reduction condition is 0, selecting N loops to output, and transmitting the deviation of the actual load of the unit and the AGC instruction to the load controller after the speed limit rate.
2. The control method of the priority action of the primary frequency modulation based on the power grid large frequency difference as claimed in claim 1, characterized in that: the direction locking module is used for judging, and the specific method is as follows: the direction locking module is used for judging the height of the power grid frequency, setting a primary frequency modulation action dead zone as 0.033Hz and a recovery value as 0.01Hz, judging the frequency deviation to generate a low-frequency locking and subtracting signal when the power grid frequency is lower than 49.967Hz, and outputting a locking and subtracting signal; when the frequency of the power grid is recovered to be higher than 49.99Hz, the blocking and reducing effects are released; when the frequency of the power grid is higher than 50.033Hz, the frequency deviation judging link generates a high-frequency increase closing signal.
3. The control method of the priority action of the primary frequency modulation based on the power grid large frequency difference as claimed in claim 1, characterized in that: frequency difference of the power grid △ f is calculated as follows:
△ f＝f-50(Hz)。
4. the control method of the priority action of the primary frequency modulation based on the power grid large frequency difference as claimed in claim 1, characterized in that: the rated rotating speed n is 3000r/min.
5. The control method of the primary frequency modulation priority action based on the power grid large frequency difference is characterized in that: the unequal rate Kc of the rotating speed of the steam turbine is 3-6%.
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| CN104052071B (en) * | 2014-04-18 | 2017-06-23 | 上海明华电力技术工程有限公司 | A kind of generating set intelligence primary frequency modulation method |
| CN105826936B (en) * | 2016-05-06 | 2018-06-29 | 上海明华电力技术工程有限公司 | A kind of fired power generating unit intelligence primary frequency modulation control method for power grid large frequency-difference |
| CN106169767B (en) * | 2016-06-23 | 2019-03-05 | 国网新疆电力公司电力科学研究院 | The control method for coordinating of fired power generating unit primary frequency modulation and AGC |
| CN111082438B (en) * | 2020-01-03 | 2024-04-02 | 中国大唐集团科学技术研究院有限公司西北电力试验研究院 | Control method for locking AGC instruction of priority primary frequency modulation function |
| CN114256855B (en) * | 2020-09-22 | 2024-08-06 | 金风科技股份有限公司 | Frequency modulation control method and device for wind power plant |
| CN112583055B (en) * | 2020-11-09 | 2022-05-17 | 中国长江电力股份有限公司 | Power grid AGC, power plant AGC and primary frequency modulation cooperation control method |
| CN112865134A (en) * | 2021-01-04 | 2021-05-28 | 神华神东电力有限责任公司 | Power grid frequency primary frequency modulation control system |
| CN112865135B (en) * | 2021-01-15 | 2022-09-06 | 国网江苏省电力有限公司 | Primary frequency modulation priority control method for new energy station |
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