A method for automatically dispatching a reservoir in a hydropower station

Abstract

The invention discloses an automatic dispatching method for a hydropower station reservoir, comprising judging whether each collected signal is within a limit range; P Calculate the flow rate Q that the gate needs to discharge K ; Determine the flow rate Q K Which gate is within the preset processing interval; each gate calculates the gate opening that needs to be adjusted according to the assigned opening flow; adjusts the opening of each gate, and opens the gate when the adjusted opening > actual opening; closes the gate when the adjusted opening < actual opening. The present invention can automatically obtain the opening of each gate according to the inflow flow and the unit power generation flow, change the downstream flow, and maintain the reservoir water level at the water level value required by the operator; at the same time, it can also periodically calculate the compensation flow according to the change of the reservoir water level, and compensate and adjust the gate opening to ensure that the reservoir water level can always be stable at the water level value required by the operator; significantly reducing the workload of the operating staff on duty.

Description

Technical Field

[0001] The invention relates to the technical field of hydropower station reservoir dispatching, and in particular to an automatic dispatching method for a hydropower station reservoir. Background Art

[0002] The normal dispatching of the reservoir of a hydropower station is related to the safe production and economic benefits of the power station. Especially for daily regulating reservoirs, the water inflow varies significantly at different times of the day, and the dispatching operation of the reservoir is more frequent. It is necessary to constantly pay attention to the inflow flow, reservoir water level, etc., and reasonably adjust the opening of each gate to ensure that the reservoir water level is maintained at an appropriate height to meet the normal production needs of the unit.

[0003] At present, the discharge flow is still more dependent on the operation staff to manually operate the gate opening according to the inflow and power generation demand to adjust the discharge flow. Due to the small storage capacity of the daily regulation reservoir, the inflow changes frequently, and the power generation demand also changes with the load curve, which requires the operation staff to frequently dispatch and operate the reservoir gate. At the same time, due to the inevitable errors such as the accuracy deviation of the measuring element itself, the gate opening calculation deviation, and the gate opening adjustment dead zone, even if the inflow, power generation and discharge flow remain constant, the reservoir water level will still show a slow rise or fall trend. This requires the operation staff to make a reverse fine adjustment to the gate opening in time. This series of reservoir scheduling requirements and tasks have added a lot of workload to the operation staff.

[0004] Therefore, it is necessary to develop an automatic scheduling method for hydropower station reservoirs to solve the above problems. Summary of the invention

[0005] The purpose of the present invention is to design a method for automatically dispatching a reservoir of a hydropower station in order to solve the above problems.

[0006] The present invention achieves the above-mentioned purpose through the following technical solutions:

[0007] A method for automatic dispatching of a reservoir in a hydropower station comprises the following steps:

[0008] S1, determine whether each collected signal is within the limit range; if yes, proceed to the next step; if not, exit the automatic adjustment;

[0009] S2. Obtain the flow rate Q of each unit P ;

[0010] S3, according to the inflow flow Q and the flow of each unit Q P Calculate the flow rate Q that the gate needs to discharge K , the calculation formula is: Q K =QQ P ;

[0011] S4. Determine the flow rate QK Within which gate's preset processing interval;

[0012] S5. Each gate calculates the gate opening that needs to be adjusted according to the assigned opening flow;

[0013] S6, determine whether the opening of each gate is within the dead zone: if so, stop opening the gate, otherwise proceed to the next step;

[0014] S7. Adjust the opening of each gate, and open the gate when the adjusted opening is greater than the actual opening; close the gate when the adjusted opening is less than the actual opening.

[0015] The beneficial effects of the present invention are:

[0016] The present invention can automatically obtain the opening of each gate according to the inflow flow and the unit power generation flow, change the discharge flow, and maintain the reservoir water level at the water level value required by the operating personnel; at the same time, it can also periodically calculate the compensation flow according to the change of the reservoir water level, and compensate and adjust the gate opening to ensure that the reservoir water level can always be stabilized at the water level value required by the operating personnel; and significantly reduce the workload of the operating staff on duty. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is the main method flow chart of this application;

[0018] Figure 2 This is the method flow of this application. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0020] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0022] In the description of the present invention, it should be understood that the terms "upper", "lower", "inside", "outside", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or are directions or positional relationships in which the product of the invention is usually placed when in use, or are directions or positional relationships commonly understood by those skilled in the art. These directions or positional relationships are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0023] Furthermore, the terms “first”, “second”, etc. are merely used for distinguishing descriptions and should not be understood as indicating or implying relative importance.

[0024] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms such as "setting" and "connection" should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] The specific implementation modes of the present invention are described in detail below in conjunction with the accompanying drawings.

[0026] like Figure 1 and Figure 2 As shown, a method for automatic dispatching of a reservoir in a hydropower station comprises the following steps:

[0027] First, it is preferred to determine whether the automatic scheduling function is in operation. If it is in operation, proceed to the next step. If it is not in operation, no automatic scheduling control will be performed. (In operation: the operation duty personnel operate the host computer system to select the input; exit: the operation duty personnel operate the host computer system to select the exit, or the process automatically exits if the conditions are not met. At the same time, the input and exit status are returned to the host computer for monitoring. Then proceed to the following steps:

[0028] S1. Determine whether each collected signal is within the limit range, including: determine whether the opening of each gate is within the opening limit range; whether the water level L is within the normal water storage level range; whether the inflow Q meets the needs of automatic adjustment, including: whether the inflow Q meets the needs of automatic adjustment, including when the inflow Q is too large, it is necessary to shut down to avoid peak, and when the inflow Q is too small and only meets the power generation of the unit, there is no need to put into automatic adjustment; whether the power of each unit is within the normal active power range; if so, enter the next step; if not, exit the automatic adjustment; the inflow Q is collected and sent by the flow sensor; the reservoir water level L is collected and sent by the liquid level transmitter;

[0029] S2. Obtain the flow rate Q of each unit P (If the unit has a flow sensor, skip the calculation step); flow rate Q of each unit P It is calculated based on the power of each unit. The power of each unit is sent by the unit power transmitter. The calculation formula is:

[0030] Q P =K P ∑P,

[0031] Among them, ∑P is the sum of the power of each unit; K P is the water consumption rate of the unit.

[0032] S3, according to the inflow flow Q and the flow of each unit Q P Calculate the flow rate Q that the gate needs to discharge K , the calculation formula is: Q K =QQ P ;

[0033] S4. Determine the flow rate Q K Within which gate's preset processing interval;

[0034] S5. Each gate calculates the gate opening that needs to be adjusted according to the assigned opening flow;

[0035] S6, determine whether the opening of each gate is within the dead zone: if so, stop opening the gate, otherwise proceed to the next step;

[0036] S7. Adjust the opening of each gate, and open the gate when the adjusted opening is greater than the actual opening; close the gate when the adjusted opening is less than the actual opening.

[0037] In this embodiment, the gates include a sand flushing gate, a sewage discharge gate, a 1# flood discharge gate, and a 2# flood discharge gate.

[0038] In step S4, the flow rate Q is determined K The preset processing interval of which gate specifically includes:

[0039] S41, when 0<Q K ≤A, the flow rate Q K Assign the opening flow Q that needs to be adjusted to the sand flushing gate a =Q K ; Where A is the upper limit of the flow rate that can be adjusted by the manually set sand flushing gate; and proceed to the next step;

[0040] S42, A<Q K ≤B, give the sand flushing gate the maximum adjustable opening flow Q a =Q A , giving the sewage gate a remaining adjustable opening flow Q b =Q K -QA ; Where B is the upper limit of the flow rate that can be jointly adjusted by the sand flushing gate and the sewage gate set manually; and proceed to the next step;

[0041] S43, B<Q K ≤C, give the sand flushing gate and sewage gate the maximum adjustable opening flow Q a =Q A , Q b =Q B , give the remaining adjustable opening flow Q to the 1# flood discharge gate c =Q K -Q A -Q B ; Where C is the upper limit of the flow rate that can be jointly adjusted by the sand flushing gate, sewage gate and No. 1 flood discharge gate set manually; and proceed to the next step;

[0042] S44, C<Q K ≤D, give the sand flushing gate, sewage gate, and No. 1 flood discharge gate the maximum adjustable opening flow Q a =Q A , Q b =Q B , Q c =Q C , give the 2# flood discharge gate a remaining adjustable opening flow Q d =Q K -Q A -Q B -Q C ; Where D is the upper limit of the flow rate that can be jointly adjusted by the manually set sand flushing gate, sewage gate, 1# flood discharge gate and 2# flood discharge gate; and proceed to the next step;

[0043] S45, Q K ≤0 or Q K >D, indicating that there is no flow for automatic adjustment or the flow is too large and automatic adjustment is not recommended, and the automatic adjustment function will be exited.

[0044] In step S5, the gate opening H of the sand flushing gate is a , Gate opening of sewage gate H b 、1# flood discharge gate opening H c 、2# flood discharge gate opening H d The calculation formulas are:

[0045] Flushing Gate H a =Q a ·K a ,

[0046] Sewage Gate H b =Q b ·K b ,

[0047] 1# Flood Discharge Gate H c =Q c ·K c ,

[0048] 2# Flood Discharge Gate H d =Q d ·K d ,

[0049] In the above formula, Q a , Q b , Q c , Q d K is the flow rate that each gate needs to discharge; a , K b , K c , K d The coefficient for converting the flow rate into the opening degree of each gate. The gate opening degree of each gate is collected by the encoder and sent to the opening meter. The encoder and the opening meter are set according to the number of gates in the power station.

[0050] In step S4, compensation adjustment is also included:

[0051] The current water level value (the reservoir water level when the automatic adjustment function is activated) is used as the reference water level value L a ;

[0052] At regular intervals, compare the actual water level value L with the reference water level value L a The difference between the water level deviation L and the water level deviation L x , for example, in this embodiment, 30 minutes is set; the calculation formula is:

[0053] L x =LL a ,

[0054] Then calculate the compensation flow Q x , the calculation formula is:

[0055] Q x =K x ·L x ,

[0056] Among them, K X is the compensation coefficient, which is the storage area (unit: m 2 ) and time (unit: s);

[0057] Then the compensation flow Q x Add the opening flow Q that needs to be adjusted for the sand flushing gate a That's it.

[0058] In step S6, judging whether the opening of each gate is within the dead zone includes: judging whether the difference between the gate opening to be adjusted and the actual opening is less than the set opening dead zone.

[0059] When the operating staff on duty need to maintain the current reservoir water level, they can activate the automatic dispatching function to realize the automatic regulation of the reservoir: according to the changes in the incoming water flow and the unit flow, each gate is automatically operated to adjust and change the downstream flow. At the same time, in various situations such as abnormal inflow (too high or low), abnormal gate opening, abnormal water level collection, etc., the automatic adjustment function will be automatically exited, and the exit status will be fed back to the operating staff on duty, who will make subsequent dispatching arrangements according to the actual situation. The present invention greatly reduces the workload of the operating staff on duty, brings convenience to the work, and improves the work efficiency of the operating staff on duty.

[0060] The technical solution of the present invention is not limited to the above-mentioned specific embodiments. All technical variations made according to the technical solution of the present invention fall within the protection scope of the present invention.

Claims

1. A method for automatic dispatching of a reservoir in a hydropower station, characterized in that: The following steps are involved: S1, judging whether each collected signal is within the limit range; If yes, go to the next step; if no, exit the automatic adjustment; Determine whether each collected signal is within the limit range, including: whether the opening of each gate is within the opening limit range; whether the water level L is within the normal water storage level range; whether the inflow flow Q meets the needs of automatic regulation; whether the power of each unit is within the normal active power range; S2. Obtain the flow rate Q of each unit P ; S3, according to the inflow flow Q and the flow of each unit Q P Calculate the flow rate Q that the gate needs to discharge K , the calculation formula is: Q K =QQ P ; S4. Determine the flow rate Q K In which gate's preset processing interval; step S4 also includes compensation adjustment: Take the current water level value as the reference water level value L a ; At regular intervals, compare the actual water level value L with the reference water level value L a The difference between the water level deviation and the water level deviation L x , the calculation formula is: L x =LL a Then calculate the compensation flow Q x , the calculation formula is: Q x =K x ·L x Among them, K X is the compensation coefficient, which is the ratio of storage area to time; Then the compensation flow Q x Add the opening flow Q that needs to be adjusted for the sand flushing gate a That's it; In step S4, the flow rate Q is determined K The preset processing interval of which gate specifically includes: S41, when 0<Q K ≤A, the flow rate Q K Assign the opening flow Q that needs to be adjusted to the sand flushing gate a =Q K ; Where A is the upper limit of the flow rate that can be adjusted by the manually set sand flushing gate; and proceed to the next step; S42, A<Q K ≤B, give the sand flushing gate the maximum adjustable opening flow Q a =Q A , giving the sewage gate a remaining adjustable opening flow Q b =Q K -Q A ; Where B is the upper limit of the flow rate that can be jointly adjusted by the sand flushing gate and the sewage gate set manually; and proceed to the next step; S43, B<Q K ≤C, give the sand flushing gate and sewage gate the maximum adjustable opening flow Q a =Q A , Q b =Q B , giving the floodgate a remaining adjustable opening flow Q c =Q K -Q A -Q B ; Where C is the upper limit of the flow that can be jointly regulated by the sand flushing gate, sewage gate and flood discharge gate set manually; and proceed to the next step; S5. Each gate calculates the gate opening that needs to be adjusted according to the assigned opening flow; S6, determine whether the opening of each gate is within the dead zone: if so, stop opening the gate, otherwise proceed to the next step; S7. Adjust the opening of each gate, and open the gate when the adjusted opening is greater than the actual opening; close the gate when the adjusted opening is less than the actual opening.

2. A method for automatic dispatching of a hydropower station reservoir according to claim 1, characterized in that: Whether the inflow Q meets the needs of automatic regulation, including when the inflow Q is too large and needs to be shut down to avoid peak, and when the inflow Q is too small and only meets the power generation of the unit, no automatic regulation is required.

3. The automatic dispatching method of a hydropower station reservoir according to claim 1, characterized in that: The flow rate Q of each unit in step S2 P It is calculated based on the power of each unit, and the calculation formula is: Q P =K P ·∑P Among them, ∑P is the sum of the power of each unit; K P is the water consumption rate of the unit.

4. The automatic dispatching method of a hydropower station reservoir according to claim 1, characterized in that: When Q K ≤0 or Q K >C, then exit automatic adjustment.

5. The automatic dispatching method of a hydropower station reservoir according to claim 1, characterized in that: In step S5, the gate opening H of the sand flushing gate is a , Gate opening of sewage gate H b , flood discharge gate opening H c The calculation formulas are: Flushing Gate H a =Q a ·K a Sewage Gate H b =Q b ·K b Floodgate H c =Q c ·K c In the above formula, Q a , Q b , Q c K is the opening flow rate that needs to be adjusted for each gate; a , K b , K c The coefficient for converting flow rate to opening degree for each gate.

6. A method for automatic dispatching of a hydropower station reservoir according to claim 5, characterized in that: In step S6, judging whether the opening of each gate is within the dead zone includes: judging whether the difference between the gate opening to be adjusted and the actual opening is less than the set opening dead zone.

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