CN113065761B - Accurate control method for reservoir after power generation load of hydropower station is reduced rapidly - Google Patents

Accurate control method for reservoir after power generation load of hydropower station is reduced rapidly Download PDF

Info

Publication number
CN113065761B
CN113065761B CN202110351951.3A CN202110351951A CN113065761B CN 113065761 B CN113065761 B CN 113065761B CN 202110351951 A CN202110351951 A CN 202110351951A CN 113065761 B CN113065761 B CN 113065761B
Authority
CN
China
Prior art keywords
water level
flow
downstream
time interval
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
Application number
CN202110351951.3A
Other languages
Chinese (zh)
Other versions
CN113065761A (en
Inventor
蔡鹏�
胡仁焱
陈申伟
刘亚新
林显
李鹏
刘俊
曹海
陶兴勇
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
China Yangtze Power Co Ltd
Original Assignee
China Yangtze Power Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by China Yangtze Power Co Ltd filed Critical China Yangtze Power Co Ltd
Priority to CN202110351951.3A priority Critical patent/CN113065761B/en
Publication of CN113065761A publication Critical patent/CN113065761A/en
Application granted granted Critical
Publication of CN113065761B publication Critical patent/CN113065761B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
    • G06Q10/00—Administration; Management
    • G06Q10/06—Resources, workflows, human or project management; Enterprise or organisation planning; Enterprise or organisation modelling
    • G06Q10/063—Operations research, analysis or management
    • G06Q10/0631—Resource planning, allocation, distributing or scheduling for enterprises or organisations
    • G06Q10/06315—Needs-based resource requirements planning or analysis
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02B—HYDRAULIC ENGINEERING
    • E02B8/00—Details of barrages or weirs ; Energy dissipating devices carried by lock or dry-dock gates
    • E02B8/04—Valves, slides, or the like; Arrangements therefor; Submerged sluice gates
    • E02B8/045—Valves, slides, or the like; Arrangements therefor; Submerged sluice gates automatically movable
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
    • G06Q50/00—Information and communication technology [ICT] specially adapted for implementation of business processes of specific business sectors, e.g. utilities or tourism
    • G06Q50/06—Energy or water supply
    • 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
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/20—Hydro energy

Landscapes

  • Business, Economics & Management (AREA)
  • Engineering & Computer Science (AREA)
  • Human Resources & Organizations (AREA)
  • Economics (AREA)
  • Strategic Management (AREA)
  • Tourism & Hospitality (AREA)
  • Health & Medical Sciences (AREA)
  • Entrepreneurship & Innovation (AREA)
  • General Engineering & Computer Science (AREA)
  • Marketing (AREA)
  • Theoretical Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • General Business, Economics & Management (AREA)
  • Physics & Mathematics (AREA)
  • Structural Engineering (AREA)
  • Quality & Reliability (AREA)
  • Operations Research (AREA)
  • Educational Administration (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Development Economics (AREA)
  • Game Theory and Decision Science (AREA)
  • Public Health (AREA)
  • Water Supply & Treatment (AREA)
  • General Health & Medical Sciences (AREA)
  • Primary Health Care (AREA)
  • Control Of Eletrric Generators (AREA)

Abstract

The accurate control method of the reservoir after the power generation load of the hydropower station is rapidly reduced comprises the following steps: STEP1. the whole plant load is rapidly reduced, and dynamic monitoring and water supplementing necessity judgment are carried out; STEP2, determining water replenishing flow and a combination mode thereof; STEP3. issue and execute gate command. The invention can intelligently give the flow rate of water supplement when the power generation load of the hydropower station is rapidly reduced according to the water level variable amplitude control requirement at the downstream of the hydropower station, and automatically generate a gate opening scheme according to the downstream water level and warehouse-out flow control requirement. The invention can be widely applied to hydropower stations with shipping scheduling sensitive to downstream water level change, ensures the downstream shipping safety of the hydropower stations and gives consideration to the economy.

Description

Accurate control method for reservoir after power generation load of hydropower station is reduced rapidly
Technical Field
The invention relates to the field of hydropower station reservoir dispatching, in particular to an accurate control method for a reservoir after the power generation load of a hydropower station is rapidly reduced.
Background
The common large hydropower station generally has multiple functions of flood control, power generation, shipping and the like, and the comprehensive benefits of flood control, power generation, shipping and the like are given into consideration in the normal scheduling process, so that the striving benefits are maximized. The shipping is used as an important factor for influencing the dispatching of the hydropower station, so that the hydropower station is strictly restricted by a plurality of conditions such as delivery flow, downstream water level, downstream hour amplitude, downstream day amplitude and the like in the running process.
In the operation process of the hydropower station, the flow of the hydropower station discharged from the reservoir usually consists of two parts, namely gate drainage flow and power generation flow. Through opening different gate and aperture, can realize the accurate control of gate sluicing flow. In the real-time scheduling process, the hydropower station operation and maintenance unit can control the opening and closing of the gate and the opening according to the gate scheduling scheme. The power generation flow refers to water flow quoted when the hydropower station generates power. Along with the improvement of the single machine capacity and the total installed capacity of the hydropower station, the amplitude of the generated power flow of the hydropower station is increased more and more, and when the power generation load is greatly reduced due to the failure of a power grid or power station equipment, the generated power flow is synchronously reduced, so that the water level and flow fluctuation of a downstream river channel is caused, the adverse effect is brought to downstream shipping, and the shipping safety is seriously threatened.
At present, when most hydropower stations face the condition of rapid reduction of the power generation flow, the shipping safety is ensured by calculating the power generation flow change corresponding to the power generation load change, then opening a sluice gate and increasing the same flow. The method mainly has the following defects: the first is that water supply to the downstream river is not timely. Some hydropower stations have narrow downstream riverways and are sensitive to ex-warehouse flow change, if water cannot be timely supplemented to the downstream riverways, the downstream water level is rapidly reduced, and particularly when the hydropower stations face multiple faults in sequence, the flow change situation is complex, continuous manual calculation and adjustment of the operation mode of the gate are needed, and the situation that water is not supplemented in time can be caused. Secondly, it is not economical. In the face of the same power generation flow change, the amplitude of the downstream water level may be different, for example, the downstream water level is in the rising stage before the power generation flow changes rapidly, the amplitude of the downstream water level change is relatively small after the power generation flow is reduced rapidly, and the amplitude of the downstream water level change is larger after the power generation flow is reduced rapidly if the downstream water level is in the falling stage before the flow changes. Therefore, the method that the water replenishing flow is equal to the reduced power generation flow is not necessarily adopted under any condition, and particularly in the running dry period of the reservoir, part of the drainage flow can be reduced, and better economic effect is exerted.
Disclosure of Invention
The invention aims to provide an accurate control method of a reservoir after the power generation load of a hydropower station is quickly reduced, which can determine whether water supplementing operation is needed or not by calculating whether the water exceeding time is exceeded or not in a reservoir flow time period, and calculate a water supplementing flow value and an operation combination mode.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
the accurate control method of the reservoir after the power generation load of the hydropower station is rapidly reduced comprises the following steps:
STEP1, dynamic monitoring and water supplementing necessity judgment are carried out on rapid reduction of hydropower station load;
STEP2, determining water replenishing flow and a combination mode thereof;
STEP3, issue and execute gate command.
The STEP1 includes the following STEPs:
STEP1.1, dividing time into a series of continuous time intervals by taking u minutes as a STEP length, and dynamically monitoring and recording information such as power generation flow variation of a power station, gate leakage flow variation, downstream water level of the power station at the end of the time interval, total ex-warehouse flow of the power station at the end of the time interval and the like in each time interval;
STEP1.2, calculating the downstream water level amplitude caused by the power generation flow variation of the power station in the ith time period according to the total flow value of the power station out of the reservoir at the end of the ith-1 time period and by combining a downstream water level flow curve aiming at the ith time period;
STEP1.3, calculating the amplitude value Delta Z of the downstream water level reached by the end of the time interval according to the downstream water level value at the end of the i-1 time intervali-1；
STEP1.4, binding. DELTA.Zi-1And downstream water level amplitude delta A caused by the variable quantity of the total warehouse-out flow of the power station in the ith time periodiCalculating the total variable amplitude value delta Z of the downstream water level after the ith time intervali：
△Zi＝△Zi-1+△Ai
STEP1.5, combined with the downstream water level value L at the end of the i-1 periodi-1Downstream water level value L at the end of the i-th periodiAnd the time interval length u minutes, calculating the change speed delta of the downstream water level in the ith time intervali：
△i＝(Li-Li-1)/u
If the acceptable maximum hour negative change amplitude of the downstream water level is-H, assuming that the downstream water level uniformly reduces H within 1 hour, the average change speed is as follows:
△H＝-H/60
△Hrepresents the maximum value that can be reached by the average rate of change of the downstream water level under normal conditions, and is therefore ΔHAs the basis for judging the speed of the downstream water level.
If the maximum acceptable hour and daily negative amplitude variation of the downstream water level is-H-D, when the amplitude variation of the downstream water level is controlled, for safety, the maximum negative amplitude variation of the downstream water level needs to be controlled within-H-D, namely the negative amplitude variation of the downstream water level is controlled to be-k H or-k D, and k belongs to [0,1], and k is called as a water replenishing coefficient.
Each hydropower station automatically sets an acceptable initial water supplement coefficient value k 'according to the actual conditions in the hydropower station, and for the ith time period, the relationship between the initial water supplement coefficient k' and the water supplement coefficient k is as follows:
if Δi<0 and Δ |i|<|△HIf the water level change speed in the time interval is normal, the value of an initial water replenishing coefficient k 'does not need to be changed, and k is equal to k';
if Δi<0 and Δ |i|≥|△HIf the change speed of the water level in the time interval exceeds the normal range, the value of the initial water supplement coefficient needs to be properly reduced so as to be involved in the control of the downstream water level earlier and avoid the condition that the downstream water level exceeds the maximum amplitude control requirement due to untimely water supplement, and the value of the water supplement coefficient needs to be equal to deltaiIs inversely proportional to the value of (d);
the value of the water replenishing coefficient k is obtained finally as follows:
Figure GDA0003502104640000031
STEP1.6, calculating a safety limit value delta K which can be borne by downstream water level amplitude variation:
maximum negative amplitude limit of Δ K ═ K-
If the total variable amplitude value Delta Z of the downstream water level of the ith time periodiWhen the flow rate of the power station is more than delta K, the reduction of the delivery flow rate of the power station in the ith time period is more than the bearable safety limit value of the downstream water level control, and water supplementing operation is required; otherwise, only the relevant data of the ith time interval is calculated and recorded, and the complementation is not carried outWater operation;
STEP1.7, calculating whether the total outbound flow at the end of the ith time period is less than the shipping reference flow or not according to the initial total outbound flow value of the ith time period and the total outbound flow change value of the power station in the ith time period, and if so, performing water supplementing operation; otherwise, only the relevant data of the ith time interval are calculated and recorded, and the water replenishing operation is not carried out.
In STEP1, if the water supplement operation is performed in the ith time interval, when recording data of the (i + 1) th time interval and the following time interval, the calculated flow and the calculated water level after water supplement in the ith time interval are adopted, the water level is not actually measured by the water level meter at the end of the ith time interval, if the power generation load is rapidly reduced and exceeds the tolerable safety limit in a certain time interval, the water supplement operation is required, in order to reflect the water supplement result of the time interval by the calculation of the following time interval, the water level at the end of the time interval when the load is rapidly reduced cannot be directly adopted by the value collected by the water level meter, the comprehensive action of load reduction and water supplement amount needs to be considered, and the water level at the end of the following time interval does not adopt the value collected by the water level meter before the signal of completing the water supplement operation is received, but the water level at the end of the time interval of the preceding time interval and the power generation flow variation of the power station in the current time interval are combined, calculating to obtain; meanwhile, the total outbound flow value at the end of the period in all subsequent periods is calculated by combining the generated flow variation in the period and the water replenishing flow adopted in the period.
In the preferred scheme, the operation dispatch is to the sensitive hydropower station of the downstream water level change, when the circumstances such as the power station takes place accident shutdown, accident cutter, unit swift current load, the power of the whole factory of hydropower station can reduce fast, in STEP1, the control requirement of shipping to moisturizing operation overall effect is: the hourly amplitude and the daily amplitude do not exceed the maximum limit values specified by the regulations, and meanwhile, the total outbound flow cannot be lower than the lowest shipping reference flow.
The STEP2 includes the following STEPs:
STEP2.1, determining the water replenishing flow: if the load of the power station is rapidly reduced in the ith time period and water is required to be supplemented in STEP1, the total warehouse-out flow at the beginning of the time period is Qi-1The load reduction in this period corresponds to a flow rate of QsiAnd a water replenishing flowAmount is QbiAnd calculating the final downstream water level f (Q) according to the downstream water level flow curve L ═ f (Q) of the power stationi-1-Qsi+Qbi) Finally, the downstream water level is not lower than the lowest control value of the downstream water level, and the total delivery flow is not less than the downstream shipping reference flow;
STEP2.2, determining a combination mode of water replenishing flow: and after the water replenishing operation is determined, preferentially calling the rotary standby capacity or the cold standby capacity of the unit to replenish water, and if the called rotary standby capacity or the cold standby capacity is not enough, considering opening the gate to replenish water.
The specific process of STEP3 is as follows:
for the ith time interval, firstly judging whether a gate command in execution exists before the time interval, if so, waiting for the completion of the execution of all the gate commands, and after all the gate commands before the ith time interval are executed, combining the gate water supplement flow and the gate state of the time interval to generate a gate command list of the time interval and ordering gates to execute.
Compared with the prior art, the accurate control method for the reservoir after the power generation load of the hydropower station is rapidly reduced has the following advantages that:
1) the invention can intelligently give the flow rate of water supplement when the power generation load of the hydropower station is rapidly reduced according to the water level variable amplitude control requirement of the downstream of the hydropower station, and automatically generate a gate opening scheme according to the downstream water level and the warehouse-out flow control requirement;
2) the invention can be widely applied to hydropower stations with shipping scheduling sensitive to downstream water level change, ensures the downstream shipping safety of the hydropower stations and gives consideration to the economy.
Drawings
The invention is further illustrated with reference to the following figures and examples:
FIG. 1 is a flow chart of the present invention;
FIG. 2 is a flowchart illustrating the water replenishment necessity determining process according to the embodiment;
FIG. 3 is a flowchart illustrating a method for determining water replenishment flows and combinations thereof according to an embodiment;
FIG. 4 is a flowchart illustrating water replenishment by the gate according to the embodiment.
Detailed Description
The technical scheme of the invention is explained in detail in the following by combining the drawings and the embodiment.
As shown in fig. 1 to 4, the method for accurately controlling the reservoir after the power generation load of the hydropower station is rapidly reduced includes the steps of:
STEP1, dynamic monitoring and water supplementing necessity judgment are carried out on rapid reduction of hydropower station load;
STEP2, determining water replenishing flow and a combination mode thereof;
STEP3, issue and execute gate command.
The STEP1 includes the following STEPs:
STEP1.1, dividing time into a series of continuous time intervals by taking u minutes as a STEP length, and dynamically monitoring and recording information such as power generation flow variation of a power station, gate leakage flow variation, downstream water level of the power station at the end of the time interval, total ex-warehouse flow of the power station at the end of the time interval and the like in each time interval;
STEP1.2, calculating the downstream water level amplitude caused by the power generation flow variation of the power station in the ith time period according to the total flow value of the power station out of the reservoir at the end of the ith-1 time period and by combining a downstream water level flow curve aiming at the ith time period;
STEP1.3, calculating the amplitude value Delta Z of the downstream water level reached by the end of the time interval according to the downstream water level value at the end of the i-1 time intervali-1；
STEP1.4, binding. DELTA.Zi-1And the downstream water level amplitude Delta A caused by the variable quantity of the total power generation flow of the power station in the ith time periodiCalculating the total variable amplitude value delta Z of the downstream water level after the ith time intervali：
△Zi＝△Zi-1+△Ai
STEP1.5, combined with the downstream water level value L at the end of the i-1 periodi-1Downstream water level value L at the end of the i-th periodiAnd period of timeThe length u minutes, the change speed delta of the downstream water level in the ith period is calculatedi：
△i＝(Li-Li-1)/u
If the acceptable maximum hour negative change amplitude of the downstream water level is-H, assuming that the downstream water level uniformly reduces H within 1 hour, the average change speed is as follows:
△H＝-H/60
△Hrepresents the maximum value that can be reached by the average rate of change of the downstream water level under normal conditions, and is therefore ΔHAs the basis for judging the speed of the downstream water level.
If the maximum acceptable hour and daily negative amplitude variation of the downstream water level is-H-D, when the amplitude variation of the downstream water level is controlled, for safety, the maximum negative amplitude variation of the downstream water level needs to be controlled within-H-D, namely the negative amplitude variation of the downstream water level is controlled to be-k H or-k D, and k belongs to [0,1], and k is called as a water replenishing coefficient.
Each hydropower station automatically sets an acceptable initial water supplement coefficient value k 'according to the actual conditions in the hydropower station, and for the ith time period, the relationship between the initial water supplement coefficient k' and the water supplement coefficient k is as follows:
if Δi<0 and Δ |i|<|△HIf the water level change speed in the time interval is normal, the value of an initial water replenishing coefficient k 'does not need to be changed, and k is equal to k';
if Δi<0 and Δ |i|≥|△HIf the change speed of the water level in the time interval exceeds the normal range, the value of the initial water supplement coefficient needs to be properly reduced so as to be involved in the control of the downstream water level earlier and avoid the condition that the downstream water level exceeds the maximum amplitude control requirement due to untimely water supplement, and the value of the water supplement coefficient needs to be equal to deltaiIs inversely proportional to the value of (d);
the value of the water replenishing coefficient k is obtained finally as follows:
Figure GDA0003502104640000061
STEP1.6, calculating a safety limit value delta K which can be borne by downstream water level amplitude variation:
maximum negative amplitude limit of Δ K ═ K-
If the total variable amplitude value Delta Z of the downstream water level of the ith time periodiWhen the flow rate of the power station is more than delta K, the reduction of the delivery flow rate of the power station in the ith time period is more than the bearable safety limit value of the downstream water level control, and water supplementing operation is required; otherwise, only calculating and recording the relevant data of the ith time period, and not performing water supplementing operation;
STEP1.7, calculating whether the total outbound flow at the end of the ith time period is less than the shipping reference flow or not according to the initial total outbound flow value of the ith time period and the total outbound flow change value of the power station in the ith time period, and if so, performing water supplementing operation; otherwise, only the relevant data of the ith time interval are calculated and recorded, and the water replenishing operation is not carried out.
In STEP1, if the water supplement operation is performed in the ith time interval, when recording data of the (i + 1) th time interval and the following time interval, the calculated flow and the calculated water level after water supplement in the ith time interval are adopted, the water level is not actually measured by the water level meter at the end of the ith time interval, if the power generation load is rapidly reduced and exceeds the tolerable safety limit in a certain time interval, the water supplement operation is required, in order to reflect the water supplement result of the time interval by the calculation of the following time interval, the water level at the end of the time interval when the load is rapidly reduced cannot be directly adopted by the value collected by the water level meter, the comprehensive action of load reduction and water supplement amount needs to be considered, and the water level at the end of the following time interval does not adopt the value collected by the water level meter before the signal of completing the water supplement operation is received, but the water level at the end of the time interval of the preceding time interval and the power generation flow variation of the power station in the current time interval are combined, calculating to obtain; meanwhile, the total outbound flow value at the end of the period in all subsequent periods is calculated by combining the generated flow variation in the period and the water replenishing flow adopted in the period.
In the preferred scheme, the operation dispatch is to the sensitive hydropower station of the downstream water level change, when the circumstances such as the power station takes place accident shutdown, accident cutter, unit swift current load, the power of the whole factory of hydropower station can reduce fast, in STEP1, the control requirement of shipping to moisturizing operation overall effect is: the hourly amplitude and the daily amplitude do not exceed the maximum limit values specified by the regulations, and meanwhile, the total outbound flow cannot be lower than the lowest shipping reference flow.
The STEP2 includes the following STEPs:
STEP2.1, determining the water replenishing flow: if the load of the power station is rapidly reduced in the ith time period and water is required to be supplemented in STEP1, the total warehouse-out flow at the beginning of the time period is Qi-1The load reduction in this period corresponds to a flow rate of QsiThe water replenishing flow rate is QbiAnd calculating the final downstream water level f (Q) according to the downstream water level flow curve L ═ f (Q) of the power stationi-1-Qsi+Qbi) Finally, the downstream water level is not lower than the lowest control value of the downstream water level, and the total delivery flow is not less than the downstream shipping reference flow;
STEP2.2, determining a combination mode of water replenishing flow: and after the water replenishing operation is determined, preferentially calling the rotary standby capacity or the cold standby capacity of the unit to replenish water, and if the called rotary standby capacity or the cold standby capacity is not enough, considering opening the gate to replenish water.
The specific process of STEP3 is as follows:
for the ith time interval, firstly judging whether a gate command in execution exists before the time interval, if so, waiting for the completion of the execution of all the gate commands, and after all the gate commands before the ith time interval are executed, combining the gate water supplement flow and the gate state of the time interval to generate a gate command list of the time interval and ordering gates to execute.
The invention discloses an accurate control method of a reservoir after the power generation load of a hydropower station is quickly reduced, which comprises the following steps:
STEP1, dynamic monitoring and water replenishing necessity judgment are rapidly reduced for the whole hydropower station load:
setting the maximum control variable amplitude value of the downstream water level as follows: the hour descending amplitude does not exceed-H meter, and the day descending amplitude does not exceed-D meter; electricity installationThe relation between the downstream water level and the flow rate is a curve L ═ f (Q), and the relation between the downstream flow rate and the water level is a curve Q ═ g (L); setting the total warehouse-out flow of the primary power station in the ith period as Qi-1Downstream water level of Li-1The values are respectively equal to the total warehouse-out flow and the downstream water level value of the power station at the end of the i-1 time period, and the downstream shipping reference flow is set as Qmin；
(1) Calculating the small time-varying amplitude and the daily-varying amplitude of the downstream water level at the beginning of the ith time period:
respectively setting the initial and downstream water levels of the same time interval of the first 1 hour and the first 24 hours of the ith time interval as LHi、LDi；
The small time-varying amplitude of the water level at the beginning and the downstream of the ith period is equal to Li-1-LHiThe water level day-to-day variation amplitude of the initial and downstream of the ith time interval is equal to Li-1-LDi。
(2) Calculating the downstream water level variable amplitude caused by the reduction of the flow of the power station leaving the reservoir in the ith time period:
setting the i-th time interval, the reduction of the flow of the power station leaving the warehouse as Qsi；
At the beginning of the i-th period, the downstream water level value is f (Q)i-1)；
In the ith period, the flow of the power station coming out of the warehouse is reduced by QsiThen, the downstream water level calculation value is f (Q)i-1-Qsi)；
In the ith period, the downstream water level change value caused by the reduction of the delivery flow of the power station is f (Q)i-1)-f(Qi-1-Qsi)。
(3) And (3) calculation of water supplement necessity judgment:
the water replenishing coefficient is k, and if the downstream water level amplitude change caused by the station ex-warehouse flow reduction amount in the ith period is superposed with the hour amplitude change when the downstream water level in the ith period reaches, the downstream water level amplitude change is less than or equal to the hour water level control requirement-k H; or after the downstream water level variable amplitude caused by the reduction of the station ex-warehouse flow in the ith time period is superposed with the daily variable amplitude reached by the downstream water level in the ith time period and is less than or equal to the daily water level control requirement-k x D, the situation that water supplement is needed is indicated, namely:
Li-1-LHi-[f(Qi-1)-f(Qi-1-Qsi)]less than or equal to-k H, or Li-1-LDi-[f(Qi-1)-f(Qi-1-Qsi)]≤-k*D；
I.e., (f)Qi-1)-f(Qi-1-Qsi)≥Li-1-LHi+ k × H, or f (Q)i-1)-f(Qi-1-Qsi)≥Li-1-LDi+k*D。
After simplification, the method comprises the following steps:
f(Qi-1)-f(Qi-1-Qsi)≥min(Li-1-LHi+k*H,Li-1-LDi+k*D)
in addition, the reduction Q of the delivery flow of the power station in the ith time interval needs to be consideredsiThen, whether the total flow out of the warehouse is less than the shipping reference flow value QminIf the water content is less than the preset value, starting water supplement, wherein the judgment conditions are as follows:
Qi-1-Qsi<Qmin
in summary, the water replenishment necessity determination conditions are:
Figure GDA0003502104640000081
STEP2, determining water replenishing flow and combination mode thereof:
(1) determining the water replenishing flow:
for the ith period, before the load of the power station is rapidly reduced, the total delivery flow is Qi-1And simultaneously calculating the flow reduction quantity Q corresponding to the fast load reduction in the ith time intervalsiIf water replenishing measures are taken at the moment, the warehouse-out flow is increased by QbiThe final downstream water level is f (Q)i-1-Qsi+Qbi)。
Ensuring that the downstream water level is not lower than the lowest control value max (L)Hi-k*H,LDi-k x D), setting the downstream water level to the lowest level, obtaining the make-up water flow, namely:
f(Qi-1-Qsi+Qbi)＝max(LHi-k*H,LDi-k*D)
solving the minimum water replenishing flow as follows:
Qbi＝g(max(LHi-k*H,LDi-k*D))-Qi-1+Qsi
the downstream shipping reference flow of the hydropower station is QminIf Q isi-1-Qsi+Qbi<QminThe water supplementing flow needs to be increased to meet the requirement of shipping reference flow, and at the moment, the water supplementing flow Q needs to be addedbiComprises the following steps:
Qbi＝Qmin-Qi-1+Qsi
in summary, if the load changes rapidly in the ith time period and it is determined that water needs to be supplemented, the water supplementing flow rate is:
Qbi＝max(g(max(LHi-k*H,LDi-k*D))-Qi-1+Qsi,Qmin-Qi-1+Qsi)
the total warehouse-out flow after the ith time interval is as follows:
Qi-1-Qsi+Qbi
meanwhile, the calculated value of the downstream water level at the end of the ith period is as follows:
f(Qi-1-Qsi+Qbi)
(2) determining a combination mode of water replenishing flow:
and after the water replenishing operation is determined, preferentially calling the rotary spare capacity or the cold spare capacity of the unit for water replenishing, and if the called rotary spare capacity or the called cold spare capacity is insufficient, opening a gate for water replenishing.
For the ith time period, the available spare capacity value of the device is QIs provided with iThen, the flow value that the gate needs to be opened to replenish water is:
Qbrake i＝Qbi-QIs provided with i
The water replenishing flow and the combined mode thereof are determined as follows:
STEP3, issuing and executing of gate command:
for the ith time interval, whether a total gate command is executed before the time interval is judged firstly, and if the total gate command is executed, the execution of the total gate command is waited to be completed.
And when all the gate commands are executed before the ith time interval, generating a gate command list of the time interval by combining the gate water replenishing flow and the gate state of the time interval, and ordering the gate to execute. If some gate signals that the gate is not successfully executed due to faults are received in the execution process, the flow value of the rest gate which is not executed in place is calculated according to the executed flow of the gate, and a new gate command list is generated and issued to be executed by adopting other normal gates.
And when the gate flow is completely executed in place in the time period, sending a gate command execution completion signal in the time period for the next gate to execute the flow.

Claims (4)

1. The accurate control method of the reservoir after the power generation load of the hydropower station is rapidly reduced is characterized by comprising the following steps:
STEP1, dynamic monitoring and water supplementing necessity judgment are carried out on rapid reduction of hydropower station load;
STEP1.1, dividing time into a series of continuous time intervals by taking u minutes as a STEP length, and dynamically monitoring and recording the power generation flow variation of the power station, the gate downward discharge flow variation, the downstream water level of the power station at the end of the time interval and the total ex-warehouse flow information of the power station at the end of the time interval;
STEP1.2, calculating the downstream water level amplitude caused by the power generation flow variation of the power station in the ith time period according to the total flow value of the power station out of the reservoir at the end of the ith-1 time period and by combining a downstream water level flow curve aiming at the ith time period;
STEP1.3, calculating the amplitude value Delta Z of the downstream water level reached by the end of the time interval according to the downstream water level value at the end of the i-1 time intervali-1；
STEP1.4, binding. DELTA.Zi-1And downstream water level amplitude delta A caused by the variable quantity of the total warehouse-out flow of the power station in the ith time periodiCalculating the total variable amplitude value delta Z of the downstream water level after the ith time intervali：
△Zi＝△Zi-1+△Ai
STEP1.5, combined with the downstream water level value L at the end of the i-1 periodi-1Downstream water level value L at the end of the i-th periodiAnd the time interval length u minutes, calculating the change speed of the downstream water level in the ith time intervalDegree deltai：
△i＝(Li-Li-1)/u
If the acceptable maximum hour negative change amplitude of the downstream water level is-H, assuming that the downstream water level uniformly reduces H within 1 hour, the average change speed is as follows:
△H＝-H/60
△Hrepresents the maximum value that can be reached by the average rate of change of the downstream water level, and is therefore ΔHAs the judgment basis of the speed of the downstream water level change;
if the maximum acceptable hour and daily negative amplitude variation of the downstream water level is-H-D, when the amplitude variation of the downstream water level is controlled, for safety, the maximum negative amplitude variation of the downstream water level needs to be controlled within-H-D, namely the negative amplitude variation of the downstream water level is controlled to be-k H or-k D, and k belongs to [0,1], wherein k is called a water replenishing coefficient;
each hydropower station automatically sets an initial water supplement coefficient value k 'according to the actual conditions in the hydropower station, and for the ith time period, the relationship between the initial water supplement coefficient k' and the water supplement coefficient k is as follows:
if Δi<0 and Δ |i|<|△HIf the water level change speed in the time interval is normal, the value of an initial water replenishing coefficient k 'does not need to be changed, and k is equal to k';
if Δi<0 and Δ |i|≥|△HIf the change speed of the water level in the time interval exceeds the normal range, the value of the initial water supplement coefficient needs to be reduced so as to be involved in the control of the downstream water level earlier, the condition that the downstream water level exceeds the maximum amplitude control requirement due to untimely water supplement is avoided, and the value of the water supplement coefficient should be equal to deltaiIs inversely proportional to the value of (d);
the value of the water replenishing coefficient k is obtained finally as follows:
Figure FDA0003552467540000021
STEP1.6, calculating a safety limit value delta K which can be borne by downstream water level amplitude variation:
maximum negative amplitude limit of Δ K ═ K-
If the total variable amplitude value Delta Z of the downstream water level of the ith time periodiWhen the flow rate of the power station is more than delta K, the reduction of the delivery flow rate of the power station in the ith time period is more than the bearable safety limit value of the downstream water level control, and water supplementing operation is required; otherwise, only calculating and recording the relevant data of the ith time period, and not performing water supplementing operation;
STEP1.7, calculating whether the total outbound flow at the end of the ith time period is less than the shipping reference flow or not according to the initial total outbound flow value of the ith time period and the total outbound flow change value of the power station in the ith time period, and if so, performing water supplementing operation; otherwise, only calculating and recording the relevant data of the ith time period, and not performing water supplementing operation;
STEP2, determining water replenishing flow and a combination mode thereof;
STEP3, issue and execute gate command.
2. The method for accurately controlling the reservoir after the power generation load of the hydropower station is rapidly reduced according to claim 1, wherein in the STEP1, if the water replenishing operation is performed in the ith time interval, when the data of the (i + 1) th time interval and the later time interval are recorded, the calculated flow and the calculated water level after the water replenishing in the ith time interval are adopted, and the water level is not actually measured by the water level meter at the end of the ith time interval.
3. The method for accurately controlling the reservoir after the power generation load of the hydropower station is rapidly reduced according to claim 1, wherein the STEP2 comprises the following specific STEPs:
STEP2.1, determining the water replenishing flow: if the load of the power station is rapidly reduced in the ith time period and water is required to be supplemented in STEP1, the total warehouse-out flow at the beginning of the time period is Qi-1The load reduction in this period corresponds to a flow rate of QsiThe water replenishing flow rate is QbiAnd calculating the final downstream water level f (Q) according to the downstream water level flow curve L ═ f (Q) of the power stationi-1-Qsi+Qbi) Finally, the downstream water level is not lower than the lowest control value of the downstream water level, and the total delivery flow is not less than the downstream shipping reference flow;
STEP2.2, determining a combination mode of water replenishing flow: and after the water replenishing operation is determined, preferentially calling the rotary standby capacity or the cold standby capacity of the unit to replenish water, and if the called rotary standby capacity or the cold standby capacity is not enough, considering opening the gate to replenish water.
4. The method for accurately controlling the reservoir after the power generation load of the hydropower station is rapidly reduced according to claim 1, wherein the STEP3 comprises the following specific STEPs:
for the ith time interval, firstly judging whether a gate command in execution exists before the time interval, if so, waiting for the completion of the execution of all the gate commands, and after all the gate commands before the ith time interval are executed, combining the gate water supplement flow and the gate state of the time interval to generate a gate command list of the time interval and ordering the gate to execute, if a signal that some gates are not executed successfully due to faults is received in the execution process of the gate command, calculating the flow value of the rest gates which are not executed in place according to the flow executed by the previous gate command by the next gate command, and adopting other normal gates to generate the gate command list and issue the gate command list to execute.
CN202110351951.3A 2021-03-31 2021-03-31 Accurate control method for reservoir after power generation load of hydropower station is reduced rapidly Active CN113065761B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110351951.3A CN113065761B (en) 2021-03-31 2021-03-31 Accurate control method for reservoir after power generation load of hydropower station is reduced rapidly

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110351951.3A CN113065761B (en) 2021-03-31 2021-03-31 Accurate control method for reservoir after power generation load of hydropower station is reduced rapidly

Publications (2)

Publication Number Publication Date
CN113065761A CN113065761A (en) 2021-07-02
CN113065761B true CN113065761B (en) 2022-05-17

Family

ID=76565003

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202110351951.3A Active CN113065761B (en) 2021-03-31 2021-03-31 Accurate control method for reservoir after power generation load of hydropower station is reduced rapidly

Country Status (1)

Country Link
CN (1) CN113065761B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115438972B (en) * 2022-09-13 2023-10-31 中国长江电力股份有限公司 Cascade hydropower station joint optimization scheduling method considering electric power mutual-aid characteristics

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09210304A (en) * 1996-01-31 1997-08-12 Toshiba Corp Water supply controller for boiling water type atomic power station
CN102968674B (en) * 2012-12-05 2015-07-22 湖南省电力公司 Power generation optimizing and scheduling method of daily regulation hydropower station based on water level control
CN104460713B (en) * 2014-10-19 2018-01-05 中国长江电力股份有限公司 Unit output and floodgate linkage water compensating control method
CN104636830B (en) * 2015-02-12 2015-11-04 华中科技大学 The lower provincial power network Hydro-Thermal Systems Real-time Load method of adjustment of a kind of water change
WO2019174039A1 (en) * 2018-03-16 2019-09-19 大连理工大学 Short-term practical scheduling method for super-large-scale hydroelectric station group
CN110472826B (en) * 2019-07-09 2022-11-18 大连理工大学 Gradient hydropower station load change real-time self-adaption method considering daily electric quantity deviation

Also Published As

Publication number Publication date
CN113065761A (en) 2021-07-02

Similar Documents

Publication Publication Date Title
CN107248751B (en) A kind of energy storage station dispatch control method for realizing distribution network load power peak load shifting
US3932735A (en) Method of controlling supply of power
CN107818385B (en) Method for predicting real-time operation trend of cascade hydropower station group
CN102968674B (en) Power generation optimizing and scheduling method of daily regulation hydropower station based on water level control
CN108181940B (en) Gate regulating and controlling method suitable for downstream emergency water cut-off condition of series channel
CN113065761B (en) Accurate control method for reservoir after power generation load of hydropower station is reduced rapidly
CN104181895A (en) Strategy for optimizing short-term and ultra-short-term coordination rolling schedules adapting to access of new energy resources
CN110071530B (en) Wind power climbing coordination scheduling method of energy storage-containing power system based on LSTM
CN102776869B (en) No-forecast flood regulation method for cascade hydropower station group
CN111756074B (en) Method, system and equipment for optimizing deep peak regulation of thermal power generating unit assisted by battery energy storage
CN110219768B (en) Method and device for controlling excess pressure energy recycling power generation excess flow of circulating water system
CN105184474A (en) Hydropower station plant inside economic scheduling method considering anomaly restriction operation zone
CN113300354B (en) Source network charge storage active coordination control method and device with optimal power grid operation efficiency
CN112628055A (en) Hydroelectric generating set power mode parameter field optimization method
CN105710143A (en) Energy-saving modification method for hot rolling high-pressure water scale removing system based on energy accumulator and high-voltage inverter
CN113493866A (en) Control method for realizing automatic injection of blast furnace coal injection system
CN107947246A (en) A kind of wind-powered electricity generation power generation Distribution Indexes for considering frequency modulation additional issue and additional issue appraisal procedure
CN113469410B (en) Online calculation method and device for maximum power consumption capacity of power grid in consideration of uncertainty of new energy
CN115833273A (en) Primary frequency modulation control method, medium and system for hybrid energy storage system
CN114649832A (en) ACE allocation optimization method, system and medium with control time and control effect taken into consideration
CN105244921B (en) Unserved capacity optimal distribution method in the electric power system dispatching of the water phosgene of fire containing wind
CN107591847A (en) A kind of method that mode using variable element adjusts Hydropower Unit AGC
CN104682380B (en) Power grid load dispatching instruction response method and power grid load dispatching instruction response system
CN113783188A (en) Power grid automatic power generation control simulation method considering new energy
CN112329980A (en) Method for improving power grid operation level by machine learning fixed electricity price

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