CN104460713A - Unit power output and sluice gate linkage water supplementation control method - Google Patents
Unit power output and sluice gate linkage water supplementation control method Download PDFInfo
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- CN104460713A CN104460713A CN201410560032.7A CN201410560032A CN104460713A CN 104460713 A CN104460713 A CN 104460713A CN 201410560032 A CN201410560032 A CN 201410560032A CN 104460713 A CN104460713 A CN 104460713A
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Abstract
The invention provides a unit power output and sluice gate linkage water supplementation control method. The method comprises the first step of calculating current power generating discharge, the second step of judging whether water supplementation is needed, if not, executing the first step, and if yes, going to the next step, the third step of calculating the water supplementation flow, and the fourth step of making a gate opening distribution scheme. Through the steps, automated and quick adjustment of the discharge flow is achieved, and the influence on downstream shipping of a power station is avoided. According to the unit power output and sluice gate linkage water supplementation control method, by the adoption of the steps, the situation that water is supplemented for the downstream automatically on the condition that the water level of the downstream changes due to a large change of unit power output can be achieved automatically, so that the requirement for real-time performance of downstream shipping is effectively guaranteed, and meanwhile misoperation during manual operation is also avoided.
Description
Technical field
The present invention relates to Hydropower Plant Reservoir discharge control field, particularly a kind of unit output and floodgate to link water compensating control method.
Background technology
Under Hydropower Plant Reservoir, discharge can have significant impact to mining under reservoir water level and mining under reservoir navigation, and the lower discharge of reservoir depends on two aspects, and one is unlatching or the closedown of release floodwatering facility, adjusts letdown flow by release floodwatering facility; Two is starting or stoping of turbine-generator units, adjusts letdown flow by generating flow.The current unlatching for release floodwatering facility or closedown normally start release floodwatering facility to adjust letdown flow according to schedule manually according to dispatching requirement; when power station unit shut down or exert oneself decline to a great extent time; unit generation flow can be caused to reduce rapidly; likely can cause mining under reservoir water level fluctuation not in time because of human intervention, and and then downstream of hydro-power plant shipping be impacted.
Summary of the invention
Technical matters to be solved by this invention is to provide a kind of unit output and floodgate and links water compensating control method, can unit output significantly decline cause generating flow significantly to reduce time, for guaranteeing power station Downstream Navigation safety, avoid the level of tail water to occur significantly to decline, can automatically open floodgate and implement emergency water compensating to mining under reservoir.In preferred scheme, the vibrations that letdown flow causes Reservoir Construction building can be reduced.
For solving the problems of the technologies described above, the technical solution adopted in the present invention is: a kind of unit output and floodgate link water compensating control method, comprise the following steps:
One, current generating flow is calculated;
Two, moisturizing judges, otherwise proceeds to step one, is enter next step;
Three, refill flow calculates;
Four, gate opening allocative decision is formulated;
Realize robotization rapid adjustment letdown flow by above step, avoid impacting downstream of hydro-power plant shipping.
In preferred scheme, before moisturizing determining step, generating flow calculation procedure, outbound total flow calculation procedure and downstream is also had to calculate water level calculation procedure;
Generating flow calculation procedure is: real-time follow-up power station gross capability, and according to exerting oneself, the reduction formula of water consumption rate and flow calculates the total generating flow in power station;
Qf＝N ×η；
In formula: N is power station gross capability (kW), η is generating water consumption rate, and Qf is generating flow (m
3/ s);
Outbound total flow is generating flow and gate flow sum;
Gate flow rate calculation step is: draw letdown flow by release floodwatering facility according to current aperture, current upstream water level inquiry aperture-flow curve figure;
Downstream calculates water level calculation procedure: be converted into the current calculating water level in downstream according to current total storage outflow and downstream flow-curves of water level;
The flow maximum of statistics length is as benchmark storage outflow (Qi), and the downstream that benchmark storage outflow is corresponding calculates water level and calculates water level as benchmark downstream;
With the formula:
Q
b= (Q
i- Q
c)×α
Calculate refill flow;
In formula: Q
bfor refill flow, Q
ifor benchmark storage outflow, Q
cfor present flow rate, α is moisturizing coefficient, and α value is 0.5 ~ 1.
In preferred scheme, in moisturizing determining step, if current generating flow is lower than setting value, or in the time period, the decline rate of generating flow higher than setting value, then directly starts emergency water compensating program;
With the formula:
Q
b= Q
d×α
Calculate refill flow;
In formula: Q
bfor refill flow, Q
dfor benchmark generating flow, α is moisturizing coefficient, and α value is 0.5 ~ 1, the maximum generation flow value that benchmark generating flow is for this reason interior for the previous period.
In preferred scheme, when level of tail water feedback reaches setting value, or generating flow is higher than setting value, then emergency water compensating program determination.
In preferred scheme, described gate opening allocative decision is: current controlled and can not participated in the distribution by the gate of manual deactivation, and adopts porous small guide vane to control.
In preferred scheme, be also provided with level of tail water feedback assembly, for revising moisturizing parameter in moisturizing determining step.
In preferred scheme, in described level of tail water feedback assembly, cylindrical shell is provided with stay-supported type displacement sensor in top, the outer slip cap of cylindrical shell is connected to floating ring, reverse wheel is provided with in the bottom of cylindrical shell, the bracing wire of stay-supported type displacement sensor is walked around reverse wheel and is connected with floating ring, and stay-supported type displacement sensor is connected with emitter.
In preferred scheme, described cylindrical shell top is provided with warning lamp.
In preferred scheme, collect level of tail water parameter in each setting-up time section, directly replace with the level of tail water parameter collected the numerical value that benchmark downstream calculates water level.
A kind of unit output provided by the invention and floodgate link water compensating control method, by adopting above-mentioned step, when automatically can realize the level of tail water change caused when unit output significantly changes, automatically downstream moisturizing is given, thus effectively ensure that the real-time demand of Downstream Navigation, it also avoid the maloperation in manual operation situation simultaneously.The level of tail water feedback assembly arranged, controls to provide feedback parameter accurately to moisturizing, avoids the error occurred in calculating.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described:
Fig. 1 is interlock moisturizing control flow chart of the present invention.
Fig. 2 is operating gate protocol procedures figure in the present invention.
Fig. 3 is gate combination examination allocation flow figure in the present invention.
Fig. 4 is single gate examination allocation flow figure in the present invention.
Fig. 5 is emergency water compensating process flow diagram after stopping accident in the present invention.
Fig. 6 is the structural representation of middle and lower reaches water level feedback assembly of the present invention.
In figure: floating ring 1, bracing wire 2, cylindrical shell 3, reverse wheel 4, emitter 5, stay-supported type displacement sensor 6, warning lamp 7.
Embodiment
Embodiment 1:
As in Fig. 1 ~ 4, a kind of unit output and floodgate link water compensating control method, comprise the following steps: start to enter monitored state,
One, current generating flow is calculated;
Two, generating flow calculates;
Generating flow calculation procedure is: real-time follow-up power station gross capability, and according to exerting oneself, the reduction formula of water consumption rate and flow calculates the total generating flow in power station;
Qf＝N ×η；
In formula: N is power station gross capability (kW), η is generating water consumption rate, and Qf is generating flow (m
3/ s);
Three, outbound total flow calculates;
Outbound total flow is generating flow and gate flow sum;
Gate flow rate calculation step is: draw letdown flow by release floodwatering facility according to current aperture, current upstream water level inquiry aperture-flow curve figure;
Four, downstream calculates water level calculating;
Downstream calculates water level calculation procedure: be converted into the current calculating water level in downstream according to current total storage outflow and downstream flow-curves of water level;
The flow maximum of statistics length is as benchmark storage outflow (Qi), and the downstream that benchmark storage outflow is corresponding calculates water level and calculates water level as benchmark downstream;
Five, moisturizing judges, otherwise proceeds to step one, is enter next step;
Program with 2 seconds for the cycle carries out loop computation, record all outbound total flow values within 30 minutes before this, and the flow maximum during counting this is as benchmark storage outflow, the downstream that benchmark storage outflow is corresponding calculates water level and calculates water level as benchmark downstream.
At each computation period, if the difference that current downstream calculating water level and benchmark downstream calculate water level is greater than water level decreasing moisturizing threshold value, this threshold value artificially sets, and namely thinks and needs to start moisturizing process.
In addition, if current storage outflow is less than shipping need base flow, this base flow artificially sets, and also will start moisturizing process.
Six, refill flow calculates;
With the formula: Q
b=(Q
i-Q
c) × α calculates refill flow;
In formula: Q
bfor refill flow, Q
ifor benchmark storage outflow, Q
cfor present flow rate, α is moisturizing coefficient, and α value is 0.5 ~ 1.
Seven, gate opening allocative decision is formulated;
In preferred scheme, described gate opening allocative decision is: current controlled and can not participated in the distribution by the gate of manual deactivation, and adopts porous small guide vane to control, i.e. the preferred aperture adjustment carrying out by a small margin to all controlled gates.
Or, by different upper pond level situation tail gates aperture and discharge relation table, according to refill flow and require the gate quantity that moisturizing speed is determined to open and gatage.
Gate distribution principle:
A) current controlled and can not participated in the distribution by the gate of manual deactivation;
B) preferential symmetrical unlatching is to reduce dam and reservoir vibrations, and as dam has 10 flood discharge holes, hole, then have 1 and 5 holes, 2 and 4 holes, 6 and 10 holes, 7 and 9 holes, 3 holes, 8 six kinds, hole allocative decisions, its priority reduces successively according to by arranging after forward direction;
C) avoid single hole flow excessive;
Determine that concrete gate assigning process is as follows according to mentioned above principle:
1) gate design maximum flow is first pressed as single hole gate maximum allocated limit current value;
2) carry out the unlatching of gate Symmetric Composite examination distribute, by the maximum limited flow of feeder current ability priority assign from high to low, if be allocated successfully, terminate assigning process, otherwise until whole available Symmetric Composite all distributed rear execution next step;
3) carry out single gate examination distribute, by the maximum limited flow of feeder current ability priority assign from high to low, if be allocated successfully, terminate assigning process, otherwise until whole available gate all distributed rear execution next step;
4) if distribute unsuccessfully, 2 are repeated by the mean value of suggestion limited flow and maximum opening flow as maximum flow limit value) ~ 3) step; If reallocate unsuccessfully, repeat 2 by maximum opening flow as maximum flow limit value) ~ 3) step;
5), when in the end examination distributes failed, still all available gates can be pressed maximum opening restriction and open.
After gate moisturizing running scheme is determined, Power Station Monitored Control System will release emergency water compensating gate joint control man-machine interface automatically in operator station, man-machine interface shows the current method of operation, water levels of upstream and downstream, total flow, refill flow and gate opening water complementation, comprise the gate combination and the information such as aperture of intending opening, and by voice message manual confirmation.
After manual examination and verification confirm, corresponding operating gate order is handed down to gate local control unit and performs by supervisory system automatically one by one, carries out emergency water compensating, to guarantee to realize moisturizing within the shortest time.Operations staff can adjust operation to gate according to actual moisturizing effect in operator station at any time accordingly, realizes more accurate moisturizing.
Realize robotization rapid adjustment letdown flow by above step, avoid impacting downstream of hydro-power plant shipping.
Embodiment 2:
Moisturizing process in embodiment 1; introduce more controling parameters; advantage is beneficial to the overall situation to control; shortcoming is then that control is comparatively delayed, and especially after encountering forced outage, cutting the accidents such as machine, the level of tail water can decline rapidly; and due to the controling parameters in embodiment 1 more; the accumulation of the error of calculation can cause control hysteresis, if add the delay of human users, may jeopardize Downstream Navigation safety.
On the basis of embodiment 1, in this example, preferred scheme is as in Fig. 5, and in moisturizing determining step, if current generating flow is lower than setting value, or in the time period, the decline rate of generating flow higher than setting value, then directly starts emergency water compensating program; Wherein the minimum setting value of generating flow is final salvo, for tackling the situation of genset dead halt cutout.And the setting value of the decline rate of generating flow in the time period; then for tackling single genset forced outage or cutting the situation of machine; avoid calculating because of outbound total flow and downstream calculates the error of water level calculating and covers the unexpected change of generating flow, improve the reaction velocity of whole program.
With the formula:
Q
b= Q
d×α
Calculate refill flow;
In formula: Q
bfor refill flow, Q
dfor benchmark generating flow, α is moisturizing coefficient, and α value is 0.5 ~ 1, the maximum generation flow value that wherein benchmark generating flow is for this reason interior for the previous period.In this example, time value is 30-60 minute.
Gate opening allocative decision is in the same manner as in Example 1.
In preferred scheme, when level of tail water feedback reaches setting value, or generating flow is higher than setting value, then emergency water compensating program determination.Whole program proceeds to the operational scheme of embodiment 1.
Embodiment 3:
All depend on the calculating of the level of tail water in embodiment 1 and 2, but due to the error of calculation comparatively large, real water level situation can not be reacted.
Preferred scheme, as in Fig. 6, is also provided with level of tail water feedback assembly, for revising moisturizing parameter in moisturizing determining step.In preferred scheme, collect level of tail water parameter in each setting-up time section, directly replace with the level of tail water parameter collected the numerical value that benchmark downstream calculates water level, significantly reduce the error in computation process thus.
Preferred scheme is as in Fig. 6, in described level of tail water feedback assembly, cylindrical shell 3 is provided with stay-supported type displacement sensor 6 in top, the outer slip cap of cylindrical shell 3 is connected to floating ring 1, reverse wheel 4 is provided with in the bottom of cylindrical shell 3, the bracing wire 2 of stay-supported type displacement sensor 6 is walked around reverse wheel 4 and is connected with floating ring 1, and stay-supported type displacement sensor 6 is connected with emitter 5.The nylon wire that the preferred employing of bracing wire 2 in this example does not get wet, reverse wheel 4 adopts polytetrafluoroethylmaterial material, even if reverse wheel 4 can not rotate, also significantly can not increase the friction force to bracing wire 2.During SEA LEVEL VARIATION, floating ring 1 drives bracing wire to stretch, and when floating ring rises along cylindrical shell, bracing wire 2 is drawn out stay-supported type displacement sensor 6, when floating ring declines along cylindrical shell, then and bracing wire 2 retraction stay-supported type displacement sensor 6 under the action of the spring, thus record water level value.At set intervals, such as 10 ~ 30 minutes, then the numerical value recorded is sent to machine room through network by emitter 5, thus obtains accurate level of tail water parameter.Emitter 5 is prior art, such as, adopt based on gprs network or the 3g even emitter of 4g network.Because interval time is longer, therefore, the power consumption of this device is little, adopts solar cell according to condition, accumulator or the power supply of bank electricity.Because stay-supported type displacement sensor 6 and emitter 5 are all positioned at the top of cylindrical shell 3, the requirement therefore for sealing is not high yet, is beneficial to Long-Time Service.Further preferred, level of tail water feedback assembly is multiple, after the parameter of collection removes mxm. and minimum, gets parameters mean value, thus guarantees the accurate of level of tail water parameter further.
In preferred scheme, described cylindrical shell 3 top is provided with warning lamp 7.The warning lamp 7 arranged can avoid level of tail water feedback assembly to be collided.
The above embodiments are only the preferred technical solution of the present invention; and should not be considered as restriction of the present invention; the technical scheme that protection scope of the present invention should be recorded with claim, the equivalents comprising technical characteristic in the technical scheme of claim record is protection domain.Namely the equivalent replacement within the scope of this improves, also within protection scope of the present invention.
Claims (9)
1. unit output and floodgate link a water compensating control method, it is characterized in that comprising the following steps:
One, current generating flow is calculated;
Two, moisturizing judges, otherwise proceeds to step one, is enter next step;
Three, refill flow calculates;
Four, gate opening allocative decision is formulated;
Realize robotization rapid adjustment letdown flow by above step, avoid impacting downstream of hydro-power plant shipping.
2. unit output according to claim 1 and floodgate link water compensating control method, it is characterized in that: before moisturizing determining step, also have generating flow calculation procedure, outbound total flow calculation procedure and downstream to calculate water level calculation procedure;
Generating flow calculation procedure is: real-time follow-up power station gross capability, and according to exerting oneself, the reduction formula of water consumption rate and flow calculates the total generating flow in power station;
Qf＝N ×η；
In formula: N is power station gross capability (kW), η is generating water consumption rate, and Qf is generating flow (m
3/ s);
Outbound total flow is generating flow and gate flow sum;
Gate flow rate calculation step is: draw letdown flow by release floodwatering facility according to current aperture, current upstream water level inquiry aperture-flow curve figure;
Downstream calculates water level calculation procedure: be converted into the current calculating water level in downstream according to current total storage outflow and downstream flow-curves of water level;
The flow maximum of statistics length is as benchmark storage outflow (Qi), and the downstream that benchmark storage outflow is corresponding calculates water level and calculates water level as benchmark downstream;
With the formula:
Q
b= (Q
i- Q
c)×α
Calculate refill flow;
In formula: Q
bfor refill flow, Q
ifor benchmark storage outflow, Q
cfor present flow rate, α is moisturizing coefficient, and α value is 0.5 ~ 1.
3. unit output according to claim 1 and 2 and floodgate link water compensating control method, it is characterized in that: in moisturizing determining step, if current generating flow is lower than setting value, or in the time period, the decline rate of generating flow higher than setting value, then directly starts emergency water compensating program;
With the formula:
Q
b= Q
d×α
Calculate refill flow;
In formula: Q
bfor refill flow, Q
dfor benchmark generating flow, α is moisturizing coefficient, and α value is 0.5 ~ 1, the maximum generation flow value that benchmark generating flow is for this reason interior for the previous period.
4. unit output according to claim 3 and floodgate link water compensating control method, it is characterized in that: when level of tail water feedback reaches setting value, or generating flow is higher than setting value, then emergency water compensating program determination.
5. unit output according to claim 1 and 2 and floodgate link water compensating control method, it is characterized in that: described gate opening allocative decision is: current controlled and can not participated in the distribution by the gate of manual deactivation, and adopt porous small guide vane to control.
6. unit output according to claim 1 and floodgate link water compensating control method, it is characterized in that: be also provided with level of tail water feedback assembly, for revising moisturizing parameter in moisturizing determining step.
7. unit output according to claim 6 and floodgate link water compensating control method, it is characterized in that: in described level of tail water feedback assembly, stay-supported type displacement sensor (6) is provided with in cylindrical shell (3) top, cylindrical shell (3) outer slip cap is connected to floating ring (1), reverse wheel (4) is provided with in the bottom of cylindrical shell (3), the bracing wire (2) of stay-supported type displacement sensor (6) is walked around reverse wheel (4) and is connected with floating ring (1), and stay-supported type displacement sensor (6) is connected with emitter (5).
8. unit output according to claim 7 and floodgate link water compensating control method, it is characterized in that: described cylindrical shell (3) top is provided with warning lamp (7).
9. the unit output according to claim 6 or 7 and floodgate link water compensating control method, it is characterized in that: collect level of tail water parameter in each setting-up time section, directly replace with the level of tail water parameter collected the numerical value that benchmark downstream calculates water level.
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| CN113506010A (en) * | 2021-07-21 | 2021-10-15 | 华电云南发电有限公司 | Large-scale watershed hydropower station flood discharge gate digital centralized regulation and control method |
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