CN111461502A - Calculation and control method for equivalent vibration area of power station - Google Patents
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Abstract
The invention discloses a calculation and control method of a power station equivalent vibration area, which comprises the steps of calculating a joint scheduling total set value range by obtaining unit quote flow, ecological flow and inter-station interval flow, calculating a joint scheduling equivalent vibration area according to the joint scheduling total set value range, setting a joint scheduling total active target value by a system, judging whether the joint scheduling total active target value is in the joint scheduling equivalent vibration area, if so, failing the set target value, keeping the original total active target value, and giving an alarm; otherwise, scheduling according to the set joint scheduling total active target value. The invention can avoid the working of the jointly scheduled hydraulic turbine set in a vibration area, more effectively improve the stability and reliability of the equipment and ensure the safe operation of the equipment.
Description
Technical Field
The invention relates to the field of hydropower dispatching, in particular to a calculation and control method for an equivalent vibration area of a power station.
Background
Vibration is one of the most prominent problems during operation of a hydroelectric power plant. The vibration of the hydroelectric generating set is mainly caused by mechanical vibration, hydraulic vibration and electromagnetic vibration. If the unit frequently spans a plurality of irregular vibration areas during operation, the vibration of the water turbine generator set can not only influence the normal work of the water turbine, accelerate the loss of blades of the water turbine, but also even cause the damage of mechanical parts and plants of the unit, so that the water turbine set deviates from the optimal working condition for a long time, and directly influences the safe operation of a hydropower station group and a power grid. Therefore, the operation of the turbine unit in the vibration region is to be avoided as much as possible during operation.
The Automatic Generation Control (AGC) of the hydraulic power plant comprehensively considers factors in various aspects such as water regime, unit capacity, unit non-operational areas (cavitation areas and vibration areas), unit consumption characteristics, operation conditions and the like on the premise of ensuring safe and reliable operation of the units, and automatically distributes a total load target value of the hydraulic power plant among the units so as to achieve the purpose of economic operation. In the load control of the generating set of the hydraulic power plant, the problems of an inoperable area, namely a vibration area, a cavitation area and the like of a water turbine are frequently encountered. The Automatic Generation Control (AGC) handles the vibration region in principle to avoid the unit from operating in the vibration region.
For AGC systems of different power stations in combined dispatching, because the number of power stations is large, the number of units is large, and the intervals of vibration areas are not consistent, the work value is easy to fall into the vibration areas of the units during combined dispatching control.
In the prior art, the calculation of the vibration area is usually the calculation of the vibration area controlled by the automatic power generation of a single power station or the calculation of the vibration areas of multiple units with the same single vibration area, the calculation is not accurate, and the calculation of the vibration area can not be carried out according to the flow of a real-time interval and the flow quoted under different water heads.
Disclosure of Invention
A calculation and control method for a power station equivalent vibration area comprises the following steps:
acquiring unit reference flow, ecological flow and inter-station interval flow: let PAIs the total power output load, P, of the A power stationBIs the total load of the B power station, PGeneral assemblyFor joint regulation of total load, PLower total limitFor joint scheduling of the lower limit of the total set point, PTotal upper limit ofFor joint scheduling of the total set pointLimit, QAFor using flow, Q, per megawatt for single machine of A power stationBFor single machines in B station, flow, Q, is quoted per megawattRaw materialIs the difference value of the ecological flow of the A power station and the B power station, QZone(s)Is the interval flow of A power station and B power station, PUpper limit of AIs the upper limit of the total output load of the A power station, PLower limit of AIs the lower limit of the total output load of the A power station, PUpper limit of BIs the upper limit of the total output load of the B power station, PLower limit of BIs the lower limit of the total output load of the B power station, PGeneral 1For the first combined dispatching total set value lower limit, P, calculated by the A power station setGeneral 2The lower limit of a second combined dispatching total set value calculated by the B power station unit; pGeneral 1' is the first combined dispatching total set value upper limit, P, calculated by the A power station unitGeneral 2The upper limit of a second combined dispatching total set value calculated by the B power station unit is calculated; then:
setting the total set value range P of the united dispatchingGeneral equipment(ii) a Then P isLower total limit＝max(PGeneral 1,PGeneral 2)；
Comparison calculation value PGeneral 1And PGeneral 2Taking the maximum value as the lower limit of the total set value of the joint scheduling:
Plower total limit＝max(PGeneral 1,PGeneral 2)；
Comparison calculation value PGeneral 1' and PGeneral 2Taking the minimum value as the upper limit of the total set value of the joint scheduling:
Ptotal upper limit of＝min(PGeneral 1',PGeneral 2')；
Then jointly schedule the total setpoint range PGeneral equipment＝{p:PLower total limit≤p≤PTotal upper limit of}
Calculating a joint scheduling calculation equivalent vibration region, and selecting a region of the joint scheduling equivalent vibration region obtained through calculation and falling into the range of a total joint scheduling set value;
let the total vibration area of the A power station set be PA vibrationUpper limit of vibration region is POn A vibrationThe lower limit of the vibration region is PA vibration down(ii) a The total vibration area of the B power station unit is PB vibrationUpper limit of vibration region is POn B vibrationThe lower limit of the vibration region is PB vibration；
PVibration 1Calculating a first joint scheduling vibration area through the total vibration area of the A power station unit; pVibration 2Calculating a second joint dispatching vibration area through the total vibration area of the unit of the B power station; pOn the vibrator 1Calculating a first joint scheduling vibration area upper limit through the total vibration area of the A power station unit; pUnder vibration 1Calculating a first joint scheduling vibration area lower limit through the total vibration area of the A power station unit; pOn the vibrator 2Calculating a second combined dispatching vibration area upper limit through a total vibration area of the B power station unit; pUnder vibration 2Calculating a second combined dispatching vibration area lower limit through the total vibration area of the unit of the B power station;
then:
Pvibration 1＝{p:PUnder vibration 1≤p≤POn the vibrator 1}；
PVibration 2＝{p:PUnder vibration 2≤p≤POn the vibrator 2}；
The joint scheduling and joint scheduling equivalent vibration region is as follows: pVibration device＝(PVibration 1∪PVibration 2)∩PGeneral equipment；
The total active target value of the joint scheduling is sent under the control of the joint control system, and the total active target value of the joint scheduling is set as PTargetComparing the total active power target value of the joint scheduling with the total set value range of the joint scheduling and the equivalent vibration area of the joint scheduling, if P isTarget∈PGeneral equipmentAnd P isTarget∈PVibration deviceIf the target value is in the vibration area, the issued target value is invalid, the original total active target value is kept, and an alarm is sent out; if it is
If the target value is out of limit, the issued target value is invalid, the original total active target value is kept, and an alarm is sent out; if PTarget∈PGeneral equipmentAnd is
And the combined control system performs combined dispatching load calculation according to the set combined dispatching total active target value and issues the calculation result to each plant station control system, and each plant station control system controls the speed regulator system to adjust the load.
The invention realizes the purpose through the following technical scheme: under the condition of multi-power station, multi-unit and multi-vibration area combined dispatching control operation, the combined dispatching equivalent vibration area range is calculated according to the vibration areas of all units, the vibration areas are reasonably avoided when the combined dispatching master control setting issuing value is set, the output of the hydropower station combined dispatching units is optimally distributed, the output load of all units is further reasonably determined, and the safe operation reliability and stability of the power station and the power grid are greatly improved.
The invention has the beneficial effects that: the method aims at the units in different vibration areas of multiple stations, can accurately calculate the vibration areas according to the real-time interval flow and the quoted flow of each unit, avoids the running of the jointly scheduled hydraulic turbine units in the vibration areas, more effectively improves the stability and reliability of a control system, and ensures the safe running of equipment.
Drawings
FIG. 1 is a flow chart of the present invention.
Detailed Description
The invention will be further described with reference to the accompanying drawings in which:
as shown in the attached figure 1, the invention discloses a method for calculating and controlling a power station equivalent vibration area, which comprises the following steps:
acquiring unit reference flow, ecological flow and inter-station interval flow: let PAIs the total power output load, P, of the A power stationBIs the total load of the B power station, PGeneral assemblyFor joint regulation of total load, PLower total limitFor joint scheduling of the lower limit of the total set point, PTotal upper limit ofFor joint scheduling of the total set point upper limit, QAFor using flow, Q, per megawatt for single machine of A power stationBFor single machines in B station, flow, Q, is quoted per megawattRaw materialIs the difference value of the ecological flow of the A power station and the B power station, QZone(s)Is the interval flow of A power station and B power station, PUpper limit of AIs the upper limit of the total output load of the A power station, PLower limit of AIs the lower limit of the total output load of the A power station, PUpper limit of BIs the upper limit of the total output load of the B power station, PLower limit of BIs the lower limit of the total output load of the B power station, PGeneral 1For the first combined dispatching total set value lower limit, P, calculated by the A power station setGeneral 2The lower limit of a second combined dispatching total set value calculated by the B power station unit; pGeneral 1' is the first combined dispatching total set value upper limit, P, calculated by the A power station unitGeneral 2The upper limit of a second combined dispatching total set value calculated by the B power station unit is calculated; then:
setting the total set value range P of the united dispatchingGeneral equipment(ii) a Then P isLower total limit＝max(PGeneral 1,PGeneral 2)；
Comparison calculation value PGeneral 1And PGeneral 2Taking the maximum value as the lower limit of the total set value of the joint scheduling:
Plower total limit＝max(PGeneral 1,PGeneral 2)；
Comparison calculation value PGeneral 1' and PGeneral 2Taking the minimum value as the upper limit of the total set value of the joint scheduling:
Ptotal upper limit of＝min(PGeneral 1',PGeneral 2')；
Then jointly schedule the total setpoint range PGeneral equipment＝{p:PLower total limit≤p≤PTotal upper limit of}
Calculating a joint scheduling calculation equivalent vibration region, and selecting a region of the joint scheduling equivalent vibration region obtained through calculation and falling into the range of a total joint scheduling set value;
let the total vibration area of the A power station set be PA vibrationUpper limit of vibration region is POn A vibrationThe lower limit of the vibration region is PA vibration down(ii) a The total vibration area of the B power station unit is PB vibrationUpper limit of vibration region is POn B vibrationThe lower limit of the vibration region is PB vibration；
PVibration 1Calculating a first joint scheduling vibration area through the total vibration area of the A power station unit; pVibration 2Calculating a second joint dispatching vibration area through the total vibration area of the unit of the B power station; pOn the vibrator 1Calculating a first joint scheduling vibration area upper limit through the total vibration area of the A power station unit; pUnder vibration 1Calculating a first joint scheduling vibration area lower limit through the total vibration area of the A power station unit; pOn the vibrator 2Calculating a second combined dispatching vibration area upper limit through a total vibration area of the B power station unit; pUnder vibration 2Calculating a second combined dispatching vibration area lower limit through the total vibration area of the unit of the B power station;
then:
Pvibration 1＝{p:PUnder vibration 1≤p≤POn the vibrator 1}；
PVibration 2＝{p:PUnder vibration 2≤p≤POn the vibrator 2}；
The joint scheduling and joint scheduling equivalent vibration region is as follows: pVibration device＝(PVibration 1∪PVibration 2)∩PGeneral equipment；
The total active target value of the joint scheduling is sent under the control of the joint control system, and the total active target value of the joint scheduling is set as PTargetComparing the total active power target value of the joint scheduling with the total set value range of the joint scheduling and the equivalent vibration area of the joint scheduling, if P isTarget∈PGeneral equipmentAnd P isTarget∈PVibration deviceIf the target value is in the vibration area, the issued target value is invalid, the original total active target value is kept, and an alarm is sent out; if it is
If the target value is out of limit, the issued target value is invalid, the original total active target value is kept, and an alarm is sent out; if PTarget∈PGeneral equipmentAnd is
And the combined control system performs combined dispatching load calculation according to the set combined dispatching total active target value and issues the calculation result to each plant station control system, and each plant station control system controls the speed regulator system to adjust the load.
Specifically, the specific formula of the joint scheduling load calculation is as follows:
PB＝Ptarget-PA。
Under the condition of multi-power station, multi-unit and multi-vibration area combined dispatching control operation, the combined dispatching equivalent vibration area range is calculated according to the vibration areas of all units, the vibration areas are reasonably avoided when the combined dispatching master control setting issuing value is set, the output of the hydropower station combined dispatching units is optimally distributed, the output load of all units is further reasonably determined, and the safe operation reliability and stability of the power station and the power grid are greatly improved.
The method aims at the units in different vibration areas of multiple stations, can accurately calculate the vibration areas according to the real-time interval flow and the quoted flow of each unit, avoids the running of the jointly scheduled hydraulic turbine units in the vibration areas, more effectively improves the stability and reliability of a control system, and ensures the safe running of equipment.
The invention has the beneficial effects that: the method can avoid the operation of the jointly scheduled hydraulic turbine set in the vibration area, more effectively improve the stability and reliability of the control system and ensure the safe operation of the equipment.
The technical solution of the present invention is not limited to the limitations of the above specific embodiments, and all technical modifications made according to the technical solution of the present invention fall within the protection scope of the present invention.
Claims (2)
1. A calculation and control method for a power station equivalent vibration area is characterized by comprising the following steps:
acquiring unit reference flow, ecological flow and inter-station interval flow: let PAIs the total power output load, P, of the A power stationBIs the total load of the B power station, PGeneral assemblyFor joint regulation of total load, PLower total limitFor joint scheduling of the lower limit of the total set point, PTotal upper limit ofFor joint scheduling of the total set point upper limit, QAFor using flow, Q, per megawatt for single machine of A power stationBFor single machines in B station, flow, Q, is quoted per megawattRaw materialIs the difference value of the ecological flow of the A power station and the B power station, QZone(s)Is the interval flow of A power station and B power station, PUpper limit of AIs the upper limit of the total output load of the A power station, PLower limit of AIs the lower limit of the total output load of the A power station, PUpper limit of BIs the upper limit of the total output load of the B power station, PLower limit of BIs the lower limit of the total output load of the B power station, PGeneral 1For the first combined dispatching total set value lower limit, P, calculated by the A power station setGeneral 2The lower limit of a second combined dispatching total set value calculated by the B power station unit; pGeneral 1' is the first combined dispatching total set value upper limit, P, calculated by the A power station unitGeneral 2The upper limit of a second combined dispatching total set value calculated by the B power station unit is calculated; then:
setting the total set value range P of the united dispatchingGeneral equipment(ii) a Then P isLower total limit＝max(PGeneral 1,PGeneral 2)；
Comparison calculation value PGeneral 1And PGeneral 2Taking the maximum value as the lower limit of the total set value of the joint scheduling:
Plower total limit＝max(PGeneral 1,PGeneral 2)；
Comparison calculation value PGeneral 1' and PGeneral 2Taking the minimum value as the upper limit of the total set value of the joint scheduling:
Ptotal upper limit of＝min(PGeneral 1',PGeneral 2')；
Then jointly schedule the total setpoint range PGeneral equipment＝{p:PLower total limit≤p≤PTotal upper limit of}
Calculating a joint scheduling calculation equivalent vibration region, and selecting a region of the joint scheduling equivalent vibration region obtained through calculation and falling into the range of a total joint scheduling set value;
let the total vibration area of the A power station set be PA vibrationUpper limit of vibration region is POn A vibrationThe lower limit of the vibration region is PA vibration down(ii) a The total vibration area of the B power station unit is PB vibrationUpper limit of vibration region is POn B vibrationThe lower limit of the vibration region is PB vibration；
PVibration 1Calculating a first joint scheduling vibration area through the total vibration area of the A power station unit; pVibration 2Calculating a second joint dispatching vibration area through the total vibration area of the unit of the B power station; pOn the vibrator 1Calculating a first joint scheduling vibration area upper limit through the total vibration area of the A power station unit; pUnder vibration 1Calculating a first joint scheduling vibration area lower limit through the total vibration area of the A power station unit; pOn the vibrator 2Calculating a second combined dispatching vibration area upper limit through a total vibration area of the B power station unit; pUnder vibration 2Under a second joint scheduling vibration area calculated through the total vibration area of the B power station unitLimiting;
then:
Pvibration 1＝{p:PUnder vibration 1≤p≤POn the vibrator 1}；
PVibration 2＝{p:PUnder vibration 2≤p≤POn the vibrator 2}；
The joint scheduling and joint scheduling equivalent vibration region is as follows: pVibration device＝(PVibration 1∪PVibration 2)∩PGeneral equipment；
The total active target value of the joint scheduling is sent under the control of the joint control system, and the total active target value of the joint scheduling is set as PTargetComparing the total active power target value of the joint scheduling with the total set value range of the joint scheduling and the equivalent vibration area of the joint scheduling, if P isTarget∈PGeneral equipmentAnd P isTarget∈PVibration deviceIf the target value is in the vibration area, the issued target value is invalid, the original total active target value is kept, and an alarm is sent out; if it is
If the target value is out of limit, the issued target value is invalid, the original total active target value is kept, and an alarm is sent out; if PTarget∈PGeneral equipmentAnd is
And the combined control system performs combined dispatching load calculation according to the set combined dispatching total active target value and issues the calculation result to each plant station control system, and each plant station control system controls the speed regulator system to adjust the load.
2. The method for calculating and controlling the equivalent vibration area of the power station as claimed in claim 1, wherein the specific formula of the joint scheduling load calculation is as follows:
PB＝Ptarget-PA。
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113255974A (en) * | 2021-05-10 | 2021-08-13 | 四川华能宝兴河水电有限责任公司 | Method for joint scheduling load distribution of cascade hydropower stations |
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| US20160169202A1 (en) * | 2013-05-03 | 2016-06-16 | State Grid Corporation Of China | Short-term operation optimization method of electric power system including large-scale wind power |
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| CN101917015A (en) * | 2010-07-20 | 2010-12-15 | 国电南瑞科技股份有限公司 | Hydraulic power plant vibration region crossing method based on master station AGC system |
| CN102664430A (en) * | 2012-05-15 | 2012-09-12 | 国网电力科学研究院 | Automatic generation control (AGC) method for generating sets of hydropower station |
| US20160169202A1 (en) * | 2013-05-03 | 2016-06-16 | State Grid Corporation Of China | Short-term operation optimization method of electric power system including large-scale wind power |
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| CN113255974A (en) * | 2021-05-10 | 2021-08-13 | 四川华能宝兴河水电有限责任公司 | Method for joint scheduling load distribution of cascade hydropower stations |
| CN113255974B (en) * | 2021-05-10 | 2023-09-15 | 四川华能宝兴河水电有限责任公司 | Method for jointly scheduling load distribution of cascade hydropower station |
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