CN112583055B - Power grid AGC, power plant AGC and primary frequency modulation cooperation control method - Google Patents
Power grid AGC, power plant AGC and primary frequency modulation cooperation control method Download PDFInfo
- Publication number
- CN112583055B CN112583055B CN202011240329.7A CN202011240329A CN112583055B CN 112583055 B CN112583055 B CN 112583055B CN 202011240329 A CN202011240329 A CN 202011240329A CN 112583055 B CN112583055 B CN 112583055B
- Authority
- CN
- China
- Prior art keywords
- agc
- frequency modulation
- primary frequency
- power
- set value
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 58
- 238000012544 monitoring process Methods 0.000 claims abstract description 71
- 230000009471 action Effects 0.000 claims abstract description 65
- 230000033228 biological regulation Effects 0.000 claims abstract description 51
- 230000000903 blocking effect Effects 0.000 claims abstract description 7
- 238000001514 detection method Methods 0.000 claims description 4
- 238000012360 testing method Methods 0.000 description 22
- 230000008569 process Effects 0.000 description 7
- 230000008859 change Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 238000012795 verification Methods 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- QDOXWKRWXJOMAK-UHFFFAOYSA-N dichromium trioxide Chemical compound O=[Cr]O[Cr]=O QDOXWKRWXJOMAK-UHFFFAOYSA-N 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000012549 training Methods 0.000 description 1
Images
Classifications
-
- 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
- H02J3/48—Controlling the sharing of the in-phase component
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Eletrric Generators (AREA)
Abstract
A power grid AGC, a power plant AGC and a primary frequency modulation cooperative control method is characterized in that in a speed regulator program, a power plant AGC and primary frequency modulation cooperative control method is adopted, a primary frequency modulation blocking active power setting of a large/small power mode is cancelled, and a primary frequency modulation, AGC and monitoring regulation superposition mode is adopted. The original functions of 'primary frequency modulation action locking active pulse adjustment' and 'primary frequency modulation action resetting 30s internal locking active pulse adjustment' are deleted in the LCU program of the unit. In the LCU program of the unit, a power plant AGC and primary frequency modulation matched control method is adopted. In an AGC program of a monitoring system, a power grid AGC and power plant AGC matched control method is adopted, and a load reverse regulation locking function is added. The method can coordinate the mutual matching relationship among the power grid AGC, the power plant AGC and the primary frequency modulation, avoid contradiction conflict of the three in the control of the hydraulic generator set, and ensure the normal safe and stable operation of the set and the power grid.
Description
Technical Field
The invention belongs to the field of automatic control of hydropower stations, and particularly relates to a power grid AGC (automatic gain control), a power plant AGC and primary frequency modulation cooperative control method.
Background
At present, the power grid AGC, the power plant AGC and the primary frequency modulation action aim at ensuring the balance of the power grid active power supply, but the three have the matching problem, the contradiction of control action is easy to occur, and the normal safe and stable operation of a unit and the power grid is influenced.
In the prior art, a command power plant AGC issued by a power grid AGC is received without logic processing, and the power plant AGC and primary frequency modulation cooperation control method in an opening degree mode includes the following steps:
1) adopting a direct superposition mode of AGC and primary frequency modulation of a power plant;
2) and a power plant AGC and primary frequency modulation soft superposition mode is adopted, and a primary frequency modulation action locking mode is adopted, namely, when primary frequency modulation acts, a locking monitoring system issues an opening degree adjusting instruction.
The above method has the following disadvantages:
the instruction sent by the power grid AGC and the reception of the no logic processing of the power plant AGC can cause the execution of the wrong instruction sent by the power grid AGC.
The mode of directly superposing the AGC of the power plant and the primary frequency modulation is adopted in the opening mode, so that the action amount of the primary frequency modulation can be offset by the AGC of the power plant when the primary frequency modulation acts, and the primary frequency modulation effect of a unit is lost.
A power plant AGC and primary frequency modulation soft superposition mode is adopted in the opening mode, and a primary frequency modulation action locking mode is adopted, so that the power plant AGC loses the effect during primary frequency modulation action, and the secondary frequency modulation function of the power grid AGC is lost.
In order to solve the problems, researchers in the field research and exploration, an article, "cooperative control transformation and experimental analysis of primary frequency modulation and AGC of a hydroelectric generating set" (hydropower and pumped storage volume 6, phase 2 (total phase 30), 20 months 04 and 20 days 2020, Luzhoxin, couragement, leaf green and the like) introduces requirements of a power grid company on optimization of coordination strategies of primary frequency modulation, AGC and a monitoring system on a power plant side, and relevant transformation and application experimental conditions of the power plant, but does not systematically and comprehensively disclose a coordination control method of the power grid AGC, the power plant AGC and the primary frequency modulation. Particularly, regarding a cooperative control method of the power plant AGC and the primary frequency modulation, the expression of related setting and reset logics of a 'primary frequency modulation priority' state bit is not clear and the logics are not strict, and meanwhile, the purpose of the 'primary frequency modulation priority' state bit is not clearly explained, so that researchers in the field can not understand the application and reproduce the method.
Disclosure of Invention
In order to solve the technical problems, the invention provides a power grid AGC, a power plant AGC and a primary frequency modulation coordination control method, which is suitable for a hydraulic power plant hydroelectric generating set and aims to coordinate the coordination relationship among the power grid AGC, the power plant AGC and the primary frequency modulation, so that the contradiction conflict generated in the control of the hydroelectric generating set is avoided, and the normal safe and stable operation of the unit and the power grid is ensured.
The technical scheme adopted by the invention is as follows:
a power grid AGC and power plant AGC cooperation control method comprises the following steps:
step 1: a controller of the monitoring system detects whether the monitoring system is put into a load reverse regulation locking function, if so, the step 2 is carried out; otherwise, returning to continue detecting again;
step 2: if the power grid AGC issues a new set value, entering a step 3; otherwise, returning to the step 1;
and step 3: if the absolute value of the frequency deviation of the bus is lower than the threshold value, the AGC of the power plant receives a new set value issued by the AGC of the power grid, calculates and distributes the new set value to the unit, and returns to the step 1; otherwise, entering step 4;
and 4, step 4: if the absolute value of the positive deviation of the bus frequency is higher than the threshold value and the new set value issued by the power grid AGC is higher than the original set value, shielding the new set value issued by the power grid AGC, keeping the current set value unchanged by the power plant AGC, and generating an alarm signal of load reverse regulation locking; otherwise, entering step 5;
and 5: if the negative deviation absolute value of the bus frequency is higher than the threshold value and the new set value issued by the power grid AGC is lower than the original set value, shielding the new set value issued by the power grid AGC, keeping the current set value unchanged by the power plant AGC, and generating an alarm signal of load reverse regulation locking; otherwise, the power plant AGC receives a new set value issued by the power grid AGC, calculates and distributes the new set value to the unit, and returns to the step 1.
A power plant AGC and primary frequency modulation cooperation control method comprises the following steps:
the method comprises the following steps: a controller of the monitoring system detects whether the monitoring system is in a power mode, if so, a primary frequency modulation and power plant AGC superposition mode is adopted, namely the power regulation target power of a speed regulator is equal to a power plant AGC set value plus a primary frequency modulation action amount, and the detection is returned to continue; if not, then go to step two;
step two: a controller of the monitoring system detects whether the monitoring system is in an opening mode, if so, the step III is carried out; if not, adopting a frequency mode strategy;
step three: detecting the primary frequency modulation resetting by a controller of the monitoring system, judging whether a set value AGC of the power plant-unit active power is less than the regulation dead zone for t1 time length, if so, setting the primary frequency modulation priority state position to be 1, and entering the fourth step; if not, resetting the primary frequency modulation priority status bit to 0, and entering the fourth step;
step IV: a controller of the monitoring system detects whether the AGC of the power plant issues a new set value, if so, the primary frequency modulation priority state bit is reset to 0, and the fifth step is carried out; if not, entering the fifth step;
step five: a controller of the monitoring system detects whether the primary frequency modulation priority state bit is 1, if so, the step II is carried out; if not, the LCU issues an opening pulse adjusting instruction in real time, the opening pulse adjusting instruction is not locked, and the step I is returned;
step sixthly, a controller of the monitoring system detects whether the primary frequency modulation acts, if so, the opening pulse adjustment instruction is locked, and the step I is returned; if not, go to step (c);
step (c): a controller of the monitoring system detects whether primary frequency modulation resetting is kept for t2 time, if yes, the LCU issues an opening pulse adjusting instruction in real time, the opening pulse adjusting instruction is not locked, and the first step is returned; if not, locking the opening pulse adjusting instruction and returning to the step I.
The whole monitoring system is divided into a plant station layer and a local control unit layer on the whole level. The site control unit layer is connected with the power station control network, and the site monitoring task of the specified equipment is completed by adopting a field bus technology.
The plant layer can be divided into a control layer, an information layer and a production information distribution layer. The plant station control layer is simultaneously connected with a power station control network and a power station information network to complete the real-time information acquisition, processing, monitoring and control tasks of the whole plant equipment, and comprises a data acquisition server, an operator station, an application server, a dispatching gateway communication server and the like. The plant information layer is connected with the power station information network to complete the management of the running information of the whole plant equipment and the arrangement and filing tasks, and the plant information layer comprises a historical data server, a training simulation station, a voice alarm server, a report printing server and the like. The production information inquiry layer is connected with the information release network, completes the inquiry work of the real-time and historical information of the whole factory, realizes the WEB release function of the monitoring system, and comprises a WEB data server, a WEB release server and the like.
And the local control unit layer is distributed according to the controlled object units and consists of Local Control Units (LCU) of the whole plant, and comprises LCU of each unit, service LCU, public LCU, switch station LCU and dam crest LCU. Each Local Control Unit (LCU) includes a PLC, a touch screen, network equipment, a cabinet, etc., and is responsible for equipment data acquisition and processing, equipment status monitoring and process monitoring, equipment control and adjustment, and equipment information communication.
The controller of the monitoring system refers to a PLC controller of a station layer application server and a station layer Local Control Unit (LCU) of the monitoring system.
A power grid AGC, a power plant AGC and primary frequency modulation cooperation control method comprises the following steps:
the method comprises the following steps: in the speed regulator program, a power plant AGC and primary frequency modulation matched control method is adopted, primary frequency modulation blocking active power setting of a large/small network power mode is cancelled, and a primary frequency modulation and AGC and monitoring regulation superposition mode is adopted, namely the power regulation target power of the speed regulator is the monitoring active power set value plus the primary frequency modulation action quantity.
Namely, under the power mode, the matching logic of the AGC of the power plant at the side of the speed regulator and the same frequency modulation action is as follows: and a primary frequency modulation and power plant AGC superposition mode is adopted, namely the power regulation target power of the speed regulator is equal to the power plant AGC set value plus the primary frequency modulation action quantity.
Step two: original functions of 'primary frequency modulation action locking active pulse regulation' and 'primary frequency modulation action resetting 30s internal locking active pulse regulation' are deleted in a unit LCU program.
Step three: in the LCU program of the unit, a power plant AGC and primary frequency modulation matched control method is adopted. In the opening mode, when the active set value is changed, a new active command is given, and the 'primary frequency modulation priority' state bit is reset, at the moment, the LCU issues a pulse width adjusting command in real time; after the condition of primary frequency modulation resetting and active setting-active feedback less than the regulation dead zone is kept for 3s, the primary frequency modulation priority state is set, the primary frequency modulation action is prior, namely, the power pulse is locked if the primary frequency modulation action is carried out, and the power pulse locking is not cancelled until the primary frequency modulation action signal is reset and kept for 5 s.
Namely, under the open degree mode, the AGC load increase and decrease command of the power plant at the LCU side is matched with the logic of the same frequency modulation action: the effectiveness of primary frequency modulation action is ensured when no new load setting command exists; and the priority of the AGC load adjustment command of the power plant is ensured under the condition of new load setting.
Step four: in an AGC program of a monitoring system, a power grid AGC and power plant AGC matching control method is adopted, a load reverse regulation locking function is added, a power grid power issuing command area is continuously judged, bus frequency deviation is judged after a command is received, and when the absolute value of the bus frequency deviation is lower than a threshold value, a set value issued by the power grid AGC is received and calculated and distributed to a unit; when the positive deviation of the bus frequency is higher than the threshold value, the new set value issued by the power grid AGC is higher than the original set value, the new set value issued by the power grid AGC is shielded, the current set value is maintained unchanged, and an alarm signal of load reverse regulation locking is generated; when the negative deviation of the bus frequency is higher than the threshold value, the new set value issued by the power grid AGC is lower than the original set value, the new set value issued by the power grid AGC is shielded, the current set value is kept unchanged, and an alarm signal of load reverse regulation locking is generated.
Namely, the load reverse adjustment locking function is added: and when the power grid frequency exceeds the threshold frequency, the dispatching AGC reverse load regulation instruction is not executed.
The invention discloses a power grid AGC, a power plant AGC and primary frequency modulation cooperation control method, which has the following technical effects:
the coordination relationship among the power grid AGC, the power plant AGC and the primary frequency modulation can be coordinated, the contradiction conflict of the three in the control of the hydraulic generator set is avoided, and the normal safe and stable operation of the set and the power grid is ensured.
Drawings
FIG. 1 is a flow chart of a method for controlling cooperation of a power grid AGC and a power plant AGC according to the present invention.
FIG. 2 is a flow chart of a method for controlling the cooperation of AGC and primary frequency modulation in a power plant.
FIG. 3 is a first waveform diagram of a logic test of the primary frequency modulation of a speed regulator and the AGC of a power plant;
FIG. 4 is a waveform diagram II of a logic test of primary frequency modulation of a speed regulator and AGC of a power plant;
FIG. 5 is a third waveform diagram of a logic test of the primary frequency modulation of the speed regulator and the AGC of the power plant;
fig. 6 is a fourth waveform diagram of the logic test of the primary frequency modulation of the speed regulator and the AGC of the power plant.
Detailed Description
A power grid AGC, a power plant AGC and primary frequency modulation cooperation control method comprises the following specific cooperation control method:
a flow chart of a method for controlling cooperation of a power grid AGC and a power plant AGC is shown in FIG. 1, and the method comprises the following steps:
step 1: a controller of the monitoring system detects whether the monitoring system is put into a load reverse regulation locking function, if so, the step 2 is carried out; otherwise, returning to resume detection.
And 2, step: if the power grid AGC issues a new set value, entering a step 3; otherwise, returning to the step 1;
and step 3: if the absolute value of the frequency deviation of the bus is lower than the threshold value, the AGC of the power plant receives a new set value issued by the AGC of the power grid, calculates and distributes the new set value to the unit, and returns to the step 1; otherwise, entering step 4;
and 4, step 4: if the absolute value of the positive deviation of the bus frequency is higher than the threshold value and the new set value issued by the power grid AGC is higher than the original set value, shielding the new set value issued by the power grid AGC, keeping the current set value unchanged by the power plant AGC, and generating an alarm signal of load reverse regulation locking; otherwise, entering step 5;
and 5: if the negative deviation absolute value of the bus frequency is higher than the threshold value and the new set value issued by the power grid AGC is lower than the original set value, shielding the new set value issued by the power grid AGC, keeping the current set value unchanged by the power plant AGC, and generating an alarm signal of load reverse regulation locking; otherwise, the power plant AGC receives a new set value issued by the power grid AGC, calculates and distributes the new set value to the unit, and returns to the step 1.
(II) a power plant AGC and primary frequency modulation cooperation control method, a flow chart is shown in figure 2, and the method comprises the following steps:
the method comprises the following steps: a controller of the monitoring system detects whether the monitoring system is in a power mode, if so, a primary frequency modulation and power plant AGC superposition mode is adopted, namely the power regulation target power of a speed regulator is equal to a power plant AGC set value plus a primary frequency modulation action amount, and the step 1 is returned to continue the detection again; if not, entering the step II;
step two: a controller of the monitoring system detects whether the monitoring system is in an opening mode, if so, the step III is carried out; if not, adopting a frequency mode strategy. At present, a frequency mode strategy is generally adopted, namely, an LCU automatically issues an opening pulse adjusting instruction according to an AGC instruction, and a speed regulator adjusts the opening of a guide vane according to the frequency of a set.
Step three: detecting that primary frequency modulation is repeated and the AGC set value of the power plant-the unit active power is less than the regulation dead zone or not for t1 time length by a controller of the monitoring system, if so, setting the primary frequency modulation priority state position to be 1, and entering the step IV; if not, resetting the primary frequency modulation priority status bit to 0, and entering the fourth step;
step IV: a controller of the monitoring system detects whether the AGC of the power plant issues a new set value, if so, the primary frequency modulation priority state bit is reset to 0, and the fifth step is carried out; if not, entering the fifth step;
step five: a controller of the monitoring system detects whether the primary frequency modulation priority state bit is 1, if so, the step II is carried out; if not, the LCU issues an opening pulse adjusting instruction in real time, the opening pulse adjusting instruction is not locked, and the step I is returned;
sixthly, detecting whether the primary frequency modulation acts or not by a controller of the monitoring system. If yes, locking the opening pulse adjusting instruction and returning to the first step; if not, go to step (c);
step (c): a controller of the monitoring system detects whether primary frequency modulation resetting is kept for t2 time, if yes, the LCU issues an opening pulse adjusting instruction in real time, the opening pulse adjusting instruction is not locked, and the first step is returned; if not, locking the opening pulse adjusting instruction and returning to the step I.
Example (b):
a power grid AGC, a power plant AGC and primary frequency modulation cooperation control method is applied to automatic control of power generation of a hydroelectric generating set of a power plant of a family dam, a control flow chart of the embodiment is shown in figures 1 and 2, t1 is taken for 3s, t2 is taken for 5s, and the method comprises the following steps:
the method comprises the following steps: in the program of the speed regulator, a power plant AGC and primary frequency modulation cooperative control method is adopted. The primary frequency modulation locking active power setting of a large/small network power mode is cancelled, and a primary frequency modulation, AGC and monitoring regulation superposition mode is adopted, namely, the power regulation target power of the speed regulator is the set value of the monitoring active power plus the primary frequency modulation action quantity. Namely, under the power mode, the matching logic of the same frequency modulation action of the AGC of the power plant at the side of the speed regulator is as follows: and a primary frequency modulation and power plant AGC superposition mode is adopted, namely the power regulation target power of the speed regulator is equal to the power plant AGC set value plus the primary frequency modulation action quantity.
Step two: the original functions of 'primary frequency modulation action locking active pulse adjustment' and 'primary frequency modulation action resetting 30s internal locking active pulse adjustment' are deleted in the LCU program of the unit.
Step three: in the LCU program of the unit, a power plant AGC and primary frequency modulation cooperative control method is adopted. In the opening mode, when the active set value is changed, a new active command is given, and the 'primary frequency modulation priority' state bit is reset, at the moment, the LCU issues a pulse width adjusting command in real time; after the condition of primary frequency modulation resetting and active setting-active feedback less than the regulation dead zone is kept for 3s, the primary frequency modulation priority state is set, the primary frequency modulation action is prior, namely, the power pulse is locked if the primary frequency modulation action is carried out, and the power pulse locking is not cancelled until the primary frequency modulation action signal is reset and kept for 5 s. Namely, under the open degree mode, the AGC load increase and decrease command of the power plant at the LCU side is matched with the logic of the same frequency modulation action: the effectiveness of primary frequency modulation action is ensured when no new load setting command exists; and ensuring the priority of the AGC load adjustment command of the power plant under the condition of new load setting.
Step four: in an AGC program of a monitoring system, a power grid AGC and power plant AGC cooperation control method is adopted, a load reverse regulation locking function is added, a power grid power issuing command area is continuously judged, bus frequency deviation is judged after a command is received, and when the absolute value of the bus frequency deviation is lower than a threshold value, a set value issued by the power grid AGC is received and calculated and distributed to a unit; when the positive deviation of the bus frequency is higher than the threshold value, the new set value issued by the power grid AGC is higher than the original set value, the new set value issued by the power grid AGC is shielded, the current set value is maintained unchanged, and an alarm signal of load reverse regulation locking is generated; when the negative deviation of the bus frequency is higher than the threshold value, the new set value issued by the power grid AGC is lower than the original set value, the new set value issued by the power grid AGC is shielded, the current set value is kept unchanged, and an alarm signal of load reverse regulation locking is generated. Namely, the load reverse adjustment locking function is added: and when the power grid frequency exceeds the threshold frequency, the dispatching AGC reverse load regulation instruction is not executed.
In order to verify the mutual relation of the cooperation control of the power grid AGC, the power plant AGC and the primary frequency modulation, the cooperation logic test of the primary frequency modulation of the speed regulator and the power plant AGC is carried out:
1) in the small net opening mode, the power is put into a closed loop, the primary frequency modulation action is subjected to a recovery test, and the test waveform is shown in fig. 3. As can be seen from fig. 3, in the small grid opening mode, the power is put into a closed loop, the unit frequency is disturbed by 0.4Hz, the primary frequency modulation action is performed, and the opening of the guide vane is reduced; after the primary frequency modulation action is in place, the frequency of the unit returns to 50Hz, the primary frequency modulation returns, and the opening degree of the guide vane is gradually increased; 5S, monitoring and adjusting, wherein the speed regulator receives the opening increasing pulse, and the monitoring and the primary frequency modulation simultaneously act; after the primary frequency modulation is reset and adjusted in place, monitoring partial opening reduction pulses, so that the opening of the guide vane of the speed regulator is restored to the initial value before the primary frequency modulation. In a word, under the state of the position of the primary frequency modulation priority state, the primary frequency modulation action resetting process is normal, the action quantity of the primary frequency modulation is not counteracted by the AGC action of the power plant, the primary frequency modulation function of the unit is normal, and the load adjusting process is consistent with the control logic of the method.
2) In the small network opening mode, the power is put into a closed loop, after the primary frequency modulation action, the monitoring system newly sets the load, and finally the frequency modulation is carried out to recover the test, wherein the test waveform is shown in fig. 4. As can be seen from fig. 4, in the small grid opening mode, the power is put into a closed loop, the opening of the guide vane is stabilized at the corresponding power of 500MW, the unit frequency is disturbed by 0.4Hz, the primary frequency modulation action is performed, and the opening of the guide vane is increased; before the primary frequency modulation action is in place, a monitoring system operator issues new power given by 450MW, the speed regulator immediately receives monitoring opening degree reduction pulse, and the primary frequency modulation and the monitoring active power regulation action are opposite in direction at the moment; after the primary frequency modulation action is in place, the power of the unit is stabilized at 450 MW; then the frequency of the unit returns to 50Hz, the primary frequency modulation is recovered, the monitoring participates in the adjustment after 5S, the speed regulator receives the opening degree reduction pulse, and the monitoring and the primary frequency modulation simultaneously act; after the primary frequency modulation is reset and adjusted in place, partial opening degree reducing pulses are monitored, so that the power of the unit is stabilized at 450 MW. In a word, under the state of resetting the primary frequency modulation priority state bit, during the primary frequency modulation action, the active power adjustment of the unit is based on the AGC instruction of the power plant, and the load adjustment process conforms to the control logic of the method.
3) In the small network opening mode, the power is put into a closed loop, and after the monitoring system newly sets a load, the primary frequency modulation action returns to the test, and the test waveform is shown in fig. 5. As shown in fig. 5, in the small network opening mode, the power is put into a closed loop, the opening of the guide vane is stabilized at the corresponding power of 400MW, after the monitoring system issues new power of 350MW, the speed regulator receives a guide vane reducing pulse of the monitoring system, the unit frequency is disturbed by 0.4Hz in the opening reducing process, and the primary frequency modulation action is performed, and the primary frequency modulation and the monitoring active power regulation action are opposite in direction; after the primary frequency modulation action is in place, the power of the unit is stabilized at 350 MW; then the frequency of the unit returns to 50Hz, the primary frequency modulation is recovered, the monitoring participates in the adjustment after 5S, the speed regulator receives the opening increasing pulse, and the monitoring and the primary frequency modulation simultaneously act; after the primary frequency modulation is reset and adjusted in place, partial opening increasing pulses are monitored, so that the power of the unit is stabilized at 350 MW. In a word, under the state of resetting the primary frequency modulation priority state bit, even if the primary frequency modulation acts, the active power adjustment of the unit still takes the AGC instruction of the power plant as the standard, and the load adjustment process conforms to the control logic of the method.
4) In the small network power mode, the power is put into closed loop, after the primary frequency modulation action, the monitoring system newly sets the load, and finally the frequency modulation is repeated to test, wherein the test waveform is shown in fig. 6. As can be seen from fig. 6, in the large power grid power mode, the power is put into a closed loop, the opening of the guide vane is stabilized at the corresponding power of 350MW, the unit frequency is disturbed up by 0.4Hz, the primary frequency modulation action is performed, and the opening of the guide vane is reduced; before the primary frequency modulation action is in place, a monitoring system operator issues new power given by 400MW, and after the primary frequency modulation action is in place, the power of the unit is stabilized at 320MW (the power given is reduced by 80MW of the primary frequency modulation action); and after the frequency of the unit returns to 50Hz, the primary frequency modulation is recovered, and after the primary frequency modulation action is recovered in place, the power of the unit is stabilized at 400 MW. The load adjustment process corresponds to the control logic of the method of the invention.
In order to verify the mutual relationship of the cooperation control of the power grid AGC and the power plant AGC, a verification test of the cooperation relationship of the power grid AGC and the power plant AGC is carried out:
(1): normally operating AGC in a southwest active setting mode, modifying a frequency setting threshold value delta f threshold value on line according to the current system frequency to enable the system frequency > (50 plus delta f threshold value) Hz, issuing a power setting value in a southwest distance to enable the current active setting > the last active setting value, and observing the active actual setting change condition and the load reverse regulation blocking signal action condition;
(2): normally operating AGC in a southwest active setting mode, modifying a frequency setting threshold value delta f threshold value on line according to the current system frequency to enable the system frequency > (50 plus delta f threshold value) Hz, issuing a power setting value in a southwest distance to enable the current active setting to be less than or equal to the last active setting value, and observing the active actual setting change condition and the load reverse regulation blocking signal action condition;
(3): normally operating AGC in a southwest active setting mode, modifying a frequency setting threshold value delta f threshold value on line according to the current system frequency to enable the system frequency to be less than (50-delta f threshold value) Hz, issuing a power setting value in a southwest distance to enable the current active setting to be less than the last active setting value, and observing the active actual setting change condition and the action condition of a load reverse regulation blocking signal;
(4): normally operating AGC in a southwest active setting mode, modifying a frequency setting threshold value delta f threshold value on line according to the current system frequency to enable the system frequency to be less than (50-delta f threshold value) Hz, issuing a power setting value in a southwest distance to enable the current active setting to be more than or equal to the last active setting value, and observing the active actual setting change condition and the action condition of a load reverse regulation blocking signal;
(5): normally operating AGC in a southwest active setting mode, modifying a frequency setting threshold value delta f threshold value on line according to the current system frequency to enable the (50-delta f threshold value) < system frequency < (50+ (delta f threshold value) Hz, issuing a power setting value in a southwest distance to enable the current active setting value to be larger than the last active setting value, and observing the active actual setting change condition and the signal action condition of load reverse regulation locking;
(6): normally operating AGC in a southwest active setting mode, modifying a frequency setting threshold value delta f threshold value on line according to the current system frequency to enable the (50-delta f threshold value) < system frequency < (50 plus delta f threshold value) Hz, issuing a power setting value in a southwest distance to enable the current active setting value to be less than or equal to the last active setting value, and observing the active actual setting change condition and the signal action condition of load reverse regulation locking.
The test results of the verification test of the matching relationship between the power grid AGC and the power plant AGC are shown in Table 1.
TABLE 1 verification test record chart for cooperation relationship between power grid AGC and power plant AGC
As can be seen from table 1, in the 2 nd test, the negative deviation of the system frequency is higher than the threshold, the new setting value issued by the power grid AGC is lower than the original setting value, the new setting value issued by the power grid AGC is shielded, the current setting value is maintained unchanged, and an alarm signal "load reverse regulation lock" is generated. In the 5 th test, the positive deviation of the system frequency is higher than the threshold value, the new set value issued by the power grid AGC is higher than the original set value, the new set value issued by the power grid AGC is shielded, the current set value is maintained unchanged, and an alarm signal of load reverse regulation locking is generated. And (4) performing other tests, wherein the absolute value of the frequency deviation of the system is lower than the threshold value, receiving a set value issued by the power grid AGC, and distributing the set value to a unit as a power plant AGC command. The load distribution logic corresponds to the method control logic of the invention.
According to the analysis of the test wave recording curve, the test result is normal, the coordination relationship among the power grid AGC, the power plant AGC and the primary frequency modulation is good, and no contradiction conflict occurs.
Claims (1)
1. A power grid AGC, a power plant AGC and a primary frequency modulation cooperation control method is characterized by comprising the following steps:
the method comprises the following steps: in the speed regulator program, a power plant AGC and primary frequency modulation matched control method is adopted, primary frequency modulation blocking active power setting of a large/small network power mode is cancelled, and a primary frequency modulation, AGC and monitoring regulation superposition mode is adopted, namely the power regulation target power of the speed regulator is the monitoring active power set value plus the primary frequency modulation action quantity;
step two: original functions of 'primary frequency modulation action locking active pulse adjustment' and 'primary frequency modulation action resetting 30s internal locking active pulse adjustment' are deleted in an LCU program of the unit;
step three: in the LCU program of the unit, a power plant AGC and primary frequency modulation cooperative control method is adopted; in the opening mode, when the active set value is changed, a new active command is given, and the 'primary frequency modulation priority' state bit is reset, at the moment, the LCU issues a pulse width adjusting command in real time; after the condition of resetting the primary frequency modulation and keeping the condition of | active setting-active feedback | less than the regulation dead zone for 3s, setting the state position of 'primary frequency modulation priority', wherein the primary frequency modulation action is prior, namely locking the power pulse if the primary frequency modulation action is carried out, and cancelling the power pulse locking until the signal of the primary frequency modulation action is reset and kept for 5 s;
step four: in an AGC program of a monitoring system, a power grid AGC and power plant AGC matching control method is adopted, a load reverse regulation locking function is added, a power grid power issuing command area is continuously judged, bus frequency deviation is judged after a command is received, and when the absolute value of the bus frequency deviation is lower than a threshold value, a set value issued by the power grid AGC is received and calculated and distributed to a unit; when the positive deviation of the bus frequency is higher than the threshold value, the new set value issued by the power grid AGC is higher than the original set value, the new set value issued by the power grid AGC is shielded, the current set value is maintained unchanged, and an alarm signal of load reverse regulation locking is generated; when the negative deviation of the bus frequency is higher than the threshold value, the new set value issued by the power grid AGC is lower than the original set value, the new set value issued by the power grid AGC is shielded, the current set value is kept unchanged, and an alarm signal load reverse regulation lock is generated;
the power plant AGC and primary frequency modulation cooperation control method comprises the following steps:
the method comprises the following steps: a controller of the monitoring system detects whether the monitoring system is in a power mode, if so, a primary frequency modulation and power plant AGC superposition mode is adopted, namely the power regulation target power of a speed regulator is equal to a power plant AGC set value plus a primary frequency modulation action amount, and the detection is returned to continue; if not, entering the step II;
step two: a controller of the monitoring system detects whether the monitoring system is in an opening mode, if so, the step III is carried out; if not, adopting a frequency mode strategy;
step three: detecting the primary frequency modulation resetting by a controller of the monitoring system, judging whether a set value AGC of the power plant-unit active power is less than the regulation dead zone for t1 time length, if so, setting the primary frequency modulation priority state position to be 1, and entering the fourth step; if not, resetting the primary frequency modulation priority status bit to 0, and entering the fourth step;
step IV: a controller of the monitoring system detects whether the AGC of the power plant issues a new set value, if so, the primary frequency modulation priority state bit is reset to 0, and the fifth step is carried out; if not, entering the fifth step;
step five: a controller of the monitoring system detects whether the primary frequency modulation priority state bit is 1, if so, the step II is carried out; if not, the LCU issues an opening pulse adjusting instruction in real time, the opening pulse adjusting instruction is not locked, and the step I is returned;
step sixthly, a controller of the monitoring system detects whether the primary frequency modulation acts, if so, the opening pulse adjustment instruction is locked, and the step I is returned; if not, go to step (c);
step (c): a controller of the monitoring system detects whether primary frequency modulation resetting is kept for t2 time, if yes, the LCU issues an opening pulse adjusting instruction in real time, the opening pulse adjusting instruction is not locked, and the first step is returned; if not, locking the opening pulse adjusting instruction and returning to the first step;
the power grid AGC and power plant AGC cooperation control method comprises the following steps:
step 1: a controller of the monitoring system detects whether the monitoring system is put into a load reverse regulation locking function, if so, the step 2 is carried out; otherwise, returning to continue detecting again;
step 2: if the power grid AGC issues a new set value, entering a step 3; otherwise, returning to the step 1;
and step 3: if the absolute value of the frequency deviation of the bus is lower than the threshold value, the AGC of the power plant receives a new set value issued by the AGC of the power grid, calculates and distributes the new set value to the unit, and returns to the step 1; otherwise, entering step 4;
and 4, step 4: if the absolute value of the positive deviation of the bus frequency is higher than the threshold value and the new set value issued by the power grid AGC is higher than the original set value, shielding the new set value issued by the power grid AGC, keeping the current set value unchanged by the power plant AGC, and generating an alarm signal of load reverse regulation locking; otherwise, entering step 5;
and 5: if the negative deviation absolute value of the bus frequency is higher than the threshold value and the new set value issued by the power grid AGC is lower than the original set value, shielding the new set value issued by the power grid AGC, keeping the current set value unchanged by the power plant AGC, and generating an alarm signal of load reverse regulation locking; otherwise, the power plant AGC receives a new set value issued by the power grid AGC, calculates and distributes the new set value to the unit, and returns to the step 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011240329.7A CN112583055B (en) | 2020-11-09 | 2020-11-09 | Power grid AGC, power plant AGC and primary frequency modulation cooperation control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011240329.7A CN112583055B (en) | 2020-11-09 | 2020-11-09 | Power grid AGC, power plant AGC and primary frequency modulation cooperation control method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112583055A CN112583055A (en) | 2021-03-30 |
| CN112583055B true CN112583055B (en) | 2022-05-17 |
Family
ID=75122571
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011240329.7A Active CN112583055B (en) | 2020-11-09 | 2020-11-09 | Power grid AGC, power plant AGC and primary frequency modulation cooperation control method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112583055B (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113270877A (en) * | 2021-07-05 | 2021-08-17 | 四川华能康定水电有限责任公司 | Suppression method and device for AGC reverse regulation |
| CN113452092B (en) * | 2021-08-10 | 2022-11-25 | 上海明华电力科技有限公司 | Control method for improving AGC comprehensive frequency modulation performance index of thermal power generating unit |
| CN113991756B (en) * | 2021-10-28 | 2024-08-13 | 雅砻江流域水电开发有限公司 | Hydraulic generator active power cooperative control method based on power grid frequency |
| CN114188994B (en) * | 2021-11-05 | 2024-01-19 | 华能澜沧江水电股份有限公司 | Adjusting method for improving dynamic stability of primary frequency modulation adjusting process |
| CN114188992B (en) * | 2021-11-05 | 2023-11-21 | 华能澜沧江水电股份有限公司 | Compatible frequency modulation adjustment method for hydroelectric generating set |
| CN114204610B (en) * | 2021-11-05 | 2023-11-21 | 华能澜沧江水电股份有限公司 | Primary frequency modulation method for inhibiting sensitivity of active power closed loop feedback regulation |
| CN114204571B (en) * | 2021-11-05 | 2023-11-24 | 华能澜沧江水电股份有限公司 | Primary frequency modulation method for inhibiting repeated adjustment based on adjustment target setting |
| CN114566980B (en) * | 2021-12-09 | 2024-09-20 | 国家能源集团科学技术研究院有限公司 | Control method for one-pipe multi-machine hydropower station whole plant primary frequency modulation |
| CN114784824B (en) * | 2022-05-06 | 2023-03-10 | 安徽钱营孜发电有限公司 | Control method for primary frequency modulation priority action based on power grid large frequency difference |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107231005A (en) * | 2017-06-20 | 2017-10-03 | 重庆大学 | A kind of net based on bi-level programming saves two-stage AGC unit cooperative dispatching methods |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6759902B2 (en) * | 2002-03-25 | 2004-07-06 | Andrew Corporation | Single-detector automatic gain control circuit |
-
2020
- 2020-11-09 CN CN202011240329.7A patent/CN112583055B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107231005A (en) * | 2017-06-20 | 2017-10-03 | 重庆大学 | A kind of net based on bi-level programming saves two-stage AGC unit cooperative dispatching methods |
Non-Patent Citations (3)
| Title |
|---|
| Design of AGC and primary frequency regulation monitoring and management system;Hongkai Liao;《2013 IEEE International Conference on Information and Automation (ICIA)》;20140127;全文 * |
| 基于两个细则的水电机组AGC与一次调频优化设计;吴凡等;《电工技术》;20180910(第17期);全文 * |
| 水电机组一次调频与AGC协联控制改造及试验分析;卢舟鑫等;《水电与抽水蓄能》;20200420(第02期);全文 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112583055A (en) | 2021-03-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112583055B (en) | Power grid AGC, power plant AGC and primary frequency modulation cooperation control method | |
| CN112583056A (en) | Power plant AGC and primary frequency modulation cooperation control system and method in opening degree mode | |
| CN104201691B (en) | A reactive power optimization control method and system | |
| CN113285485B (en) | Power distribution network source network charge storage multi-terminal cooperative voltage regulation method under long, short and multi-time scales | |
| CN114172161A (en) | Multi-terminal coordinated voltage governance method, system and storage medium for distribution network connected to high-permeability photovoltaics | |
| CN111258232B (en) | Fire-storage combined frequency modulation semi-physical simulation system | |
| CN103414204B (en) | Adopt the control method of dynamic voltage compensation wind generator system output reactive power | |
| CN112838622B (en) | A reactive voltage optimal control method and system for a 10kV power supply area | |
| CN116526511A (en) | Method for controlling load frequency of multi-source cooperative participation system | |
| CN113300354B (en) | Active power coordination control method and device for source-grid load-storage active power with optimal power grid operation efficiency | |
| CN109558628B (en) | Method and system for coordinated optimization of real-time power generation plan | |
| CN105958535B (en) | Distributed generation resource cluster control system and its control method | |
| Li et al. | Research on the control strategy of energy storage participation in power system frequency regulation | |
| Yang et al. | Decentralized adaptive funnel control of uncertain large-scale interconnected nonlinear system | |
| CN111651878B (en) | Large power grid static voltage stability optimization decision method and system considering situation assessment | |
| CN104767213A (en) | Energy storage system output overshoot suppression control method and device | |
| CN109347116B (en) | Method for centralized monitoring of reactive voltage state of whole network by adopting automatic voltage control system | |
| Xiangyu et al. | Regional power grid AGC control strategy research based on Q-learning algorithm under WACPB mode | |
| CN103812137B (en) | A kind of control method to generating set and device | |
| CN110854852A (en) | Method for configuring key parameters of AGC (automatic gain control) master station in high-proportion hydropower region | |
| CN112615363B (en) | Emergency coordination control method and system for dealing with multi-loop direct current blocking fault | |
| CN116032578A (en) | A Neural Network Based Microgrid Decentralized Network Attack Detection and Mitigation Method | |
| Niu et al. | Research on AGC and AVC control technology of photovoltaic power station | |
| Li et al. | AGC real-time control strategy based on DFT method | |
| CN119341103B (en) | Method and system for switching isolated islands in multi-terminal flexible direct current systems based on adaptive networking |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |