A full-automatic water circulation power generation control method and system

Abstract

The present application relates to power generation control technical field, especially a kind of full-automatic water circulation power generation control method and system, wherein method includes the interval processing to the field data of power station, and the integrated operation capability value of power station is calculated based on the field data;Collaborative load coefficient is calculated, and the collaborative operation scheme is converted into by PLC gear table collaborative load coefficient;The target running number of water lifting machine, power generation side target valve opening and target running rhythm determined in the collaborative operation scheme are read, and execution deviation state value is calculated, and the execution deviation state value is compared with preset deviation interval, and execution deviation grade and deviation source information are formed;Based on the deviation grade and deviation information source, according to the control strategy of pre-set, after executing local isolation, the continuous operation intensity coefficient is calculated, and the continuous operation control instruction set is converted into the continuous operation intensity coefficient.

Description

Technical Field

[0001] This invention relates to the field of power generation control technology, and more particularly to a fully automatic water circulation power generation control method and system. Background Technology

[0002] Existing hydropower technologies mainly include natural water-flow hydropower, conventional pumping station water diversion systems, and pumped storage systems. Natural water-driven hydropower relies on natural head and stable water inflow conditions, making it suitable for areas with long-term head differences and continuous water flow. However, its power generation capacity is greatly affected by seasons, rainfall, and natural hydrological conditions, limiting its deployment in scenarios lacking stable natural head differences. Conventional pumping station water transfer systems can achieve low-level water intake and high-level water transfer, but their control objectives are usually focused on single process tasks such as water supply, irrigation, and drainage. Control methods are mostly centered around pump station start-up and shutdown, liquid level maintenance, and local pressure regulation, making it difficult to directly adapt to the continuous closed-loop energy conversion process of "water lifting—energy storage—power generation—return water". Pumped storage systems can lift water bodies under off-peak electricity conditions and generate electricity during peak hours, but their operating logic relies on the external power grid to complete the water lifting process. The projects are large-scale, with concentrated scheduling objects, and the control focus is mostly on unit grid connection, load switching, and reservoir scheduling. For fully automatic water circulation power stations composed of a large number of water lifting units, high-level energy storage tanks, turbine generator units, main energy storage tanks, and return water pipelines, there is still a lack of a full-process control method that fits the on-site operating characteristics. Especially in a circulating system where a large cluster of pumping machines continuously replenishes water to a high-level energy storage tank, the turbine generator unit continuously consumes the high-level water, and the tailwater flows back to the main energy storage tank, the pumping capacity, energy storage status, power generation intensity, and return water support capacity will be mutually constrained. Any deviation in the execution of any link may be transmitted to other links through water level, flow rate, valve opening degree, and equipment start-up and shutdown rhythm.

[0003] Common PLC, SCADA, or DCS control methods in existing projects typically set control rules based on the number of pumps online, upper and lower limits of water tank levels, valve opening degrees, and generator operating thresholds. These methods can perform start-stop interlocking, alarms, and simple adjustments. However, under conditions where the number of pumps reaches a cluster scale, the system operates in long-term cycles, and the power generation side requires stable head and flow, problems easily arise such as scattered operating data, inconsistent control boundaries, mismatch between pumping and power generation rhythms, difficulty in timely identification of valve execution deviations, and local branch abnormalities leading to reduced efficiency or shutdown of the entire station. Specific engineering manifestations include the rapid depletion of the high-level energy storage tank in a short period, maintaining high pumping or power generation loads despite insufficient return water support from the main energy storage tank, generator-side valves continuing to operate at the original target opening degree after a pump sub-cluster startup failure, and local equipment failures being simply amplified into station-wide shutdown protection.

[0004] It is evident that existing technologies already possess the foundation for cluster control of water pumping equipment, water level monitoring, valve regulation, unit protection, and industrial networking. However, a fully automated water circulation power generation control method and system is still needed that can organize the multi-source operating states into a unified operating boundary, generate a coordinated water pumping and energy storage power generation scheme under this boundary, identify deviation states based on actual execution results, and perform isolation and continuous operation control when local anomalies occur. Summary of the Invention

[0005] To address the above problems, this invention provides a fully automatic water circulation power generation control method and system.

[0006] To achieve the above objectives, the present invention proposes a fully automatic water circulation power generation control method, comprising:

[0007] After performing interval processing on the field data of the power plant, the comprehensive operating capacity value of the power plant is calculated based on the field data;

[0008] The collaborative load coefficient is calculated based on on-site data and comprehensive operating capacity values. The collaborative load coefficient is then converted into a collaborative operation scheme using a PLC speed table. The PLC speed table is set during the commissioning phase based on the total number of water pumps installed, the sub-cluster division method, the allowable valve opening range, and the allowable load range of the generator set.

[0009] The target number of water pumps in operation, the target valve opening degree on the power generation side, and the target operating rhythm determined in the collaborative operation plan are read, and the execution deviation state value is calculated. The execution deviation state value is compared with the preset deviation range to form the execution deviation level and deviation source information.

[0010] Based on the deviation level and the source of the deviation information, after performing local isolation according to the preset control strategy, the continuous operation intensity coefficient is calculated, and the continuous operation intensity coefficient is converted into a continuous operation control instruction set.

[0011] In some embodiments, the field data includes the number of operating water pumps, the water level of the elevated storage tank, the water level of the main storage tank, the output power of the generator set, and the opening degree of the main flow valve.

[0012] In some embodiments, the continuous operation control instruction set includes locally isolated objects, a combination of pumping units that remain in operation, adjusted opening degree of power generation side valves, and operating rhythm parameters.

[0013] In some embodiments, the comprehensive operational capability value is calculated and generated using the status values ​​of the high-level energy storage tank, the main energy storage tank, the generator operation status value, the water pump cluster operation status value, and a fixed weight.

[0014] In some embodiments, the coordinated load coefficient is calculated and generated by the comprehensive operating capacity value, the status value of the high-level energy storage tank, the status value of the main energy storage tank, the operating status value of the generator, and the operating status value of the water pump cluster.

[0015] In some embodiments, the execution deviation state value is calculated and generated by the target number of water pumps in operation, the actual number of water pumps in operation on site, the target valve opening on the power generation side, the actual valve opening on site, the target operating rhythm, the actual operating rhythm, and the execution deviation weight.

[0016] In some embodiments, the continuous operation intensity coefficient is calculated by performing a deviation state value, the original operation intensity ratio of the current control cycle, and the minimum intensity ratio that allows continuous operation to be maintained.

[0017] In some embodiments, the step of performing local isolation according to a preset control strategy based on the deviation level and the source of deviation information specifically includes:

[0018] For deviations on the water pumping side, the PLC reads the operation feedback signals and current status of each water pump control cabinet, marks the water pumps that have not completed startup, lost operation feedback, or have continuously abnormal current as isolated objects, and stops counting them in subsequent operation combinations.

[0019] For valve side deviation, the PLC reads the actual opening feedback of the electric valve actuator, marks the branch where the valve with lag in response or continuous opening deviation exists as a restricted branch, and sends a hold or retract opening command to the valve in the restricted branch;

[0020] If the operating rhythm deviates, the PLC adjusts the start or stop interval of the subsequent sub-clusters according to the actual completion time of the actions of the adjacent sub-clusters.

[0021] In case of deviation in the coupling of water lifting and energy release, the central control system synchronously compresses the operating combination of the water lifting machine and the target opening degree of the turbine inlet valve.

[0022] In some embodiments, the number of operating water pumps is determined by the status of the operating contactors and current acquisition signals in the control cabinets of each water pump, and the number of water pumps in effective operation is counted by the PLC digital input points. The water levels of the high-level energy storage tank and the main energy storage tank are acquired by fixedly installed liquid level sensors. The output power of the generator set is provided by the power transmitter or the unit monitoring unit in the generator control cabinet. The opening degree of the main flow valve is provided by the position feedback signal of the electric valve actuator.

[0023] To achieve the above objectives, the present invention provides a fully automatic water circulation power generation control system, comprising:

[0024] The comprehensive capacity calculation module is used to perform interval processing on-site data of the power plant and then calculate the comprehensive operating capacity value of the power plant based on the on-site data.

[0025] The operation plan generation module is used to calculate the collaborative load coefficient based on field data and comprehensive operation capacity value, and convert the collaborative load coefficient into a collaborative operation plan through the PLC level table. The PLC level table is set during the commissioning stage according to the total number of water pumps installed, the sub-cluster division method, the valve allowable opening range, and the generator set allowable load range.

[0026] The deviation state calculation module is used to read the target number of water pumps in operation, the target valve opening degree on the power generation side, and the target operating rhythm determined in the collaborative operation plan, and calculate the execution deviation state value. The execution deviation state value is compared with the preset deviation interval to form the execution deviation level and deviation source information.

[0027] The operation control module is used to perform local isolation according to a preset control strategy based on the deviation level and the source of deviation information, calculate the continuous operation intensity coefficient, and convert the continuous operation intensity coefficient into a continuous operation control instruction set.

[0028] The beneficial effects of this invention are as follows:

[0029] This invention first unifies the operating status of the pumping unit cluster, the elevated storage tank, the main storage tank, and the generator unit into an operational capacity boundary, transforming scattered information on water level, power, and number of units into a comprehensive capacity expression that can be directly used for scheduling. Then, based on this operational capacity boundary, a coordinated operation scheme for pumping, storage, and power generation is generated. This ensures that the activation levels of the pumping unit sub-clusters, the valve opening levels on the power generation side, and the operating rhythm levels are determined by the same control criteria. Furthermore, a correction mechanism reflecting the matching relationship between elevated storage, return water support, pumping replenishment, and power generation release reduces link mismatch caused by excessive or insufficient capacity in a single link. After the coordinated operation scheme is issued, the system further sets the target number of pumping units. The target valve opening and target operating rhythm are compared with the actual feedback on site to form an execution deviation status. Deviations in water lifting execution, valve execution, rhythm execution, and synchronous deviations in water lifting and energy release are incorporated into the same judgment process to identify engineering risks where local actions meet the standards but the overall supply and release are not synchronized. When the deviation reaches a level that requires handling, the central control system determines the local isolation target based on the source of the deviation and calculates the continuous operating intensity of the remaining system based on the degree of deviation. It then issues isolation, load reduction, valve adjustment, and rhythm adjustment commands to the water pump control cabinet, electric valve actuator, and generator control unit, so that the healthy water pump sub-cluster, available flow path, and generator unit can continue to operate under the new controlled intensity. Through the aforementioned continuous control chain, this invention can address the problems in existing technologies, such as inconsistent scheduling based on dispersed operating boundaries, imbalance in the water circulation link due to inconsistent execution rhythms between the water pumping and power generation sides, difficulty in identifying misalignment between replenishment and energy release in single-point threshold alarms, and the problem that local faults can easily trigger a complete station shutdown, affecting system availability. This enables the water circulation power station to achieve more stable fully automatic continuous operation in real-world scenarios involving large-scale water pump clusters, dual-pool circulating energy storage, continuous energy release from turbine generator units, and coordinated operation of the central control platform. Attached Figure Description

[0030] Figure 1 This is a flowchart of the fully automatic water circulation power generation control method in a specific embodiment of the present invention;

[0031] Figure 2 This is a system block diagram of the fully automatic water circulation power generation control system in a specific embodiment of the present invention. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] refer to Figure 1 As shown, one embodiment of this application proposes a fully automatic water-cycle power generation control method, including:

[0034] S1: After performing interval processing on the field data of the power plant, the comprehensive operating capacity value of the power plant is calculated based on the field data, specifically including:

[0035] When a fully automated water-circulating power station starts up or enters a new control cycle, the central control system reads feedback signals from field sensors and equipment control cabinets, and organizes the current support capabilities of the four stages of "water pumping, energy storage, power generation, and water return" into an operational capacity boundary that can be directly used for subsequent control. The number of pumping units in operation is determined by the status of the operating contactors and current acquisition signals in each pumping unit control cabinet, and the number of pumping units in effective operation is counted by the PLC digital input points; the water levels of the high-level energy storage tank and the main energy storage tank are collected by fixedly installed level sensors, and the sensor signals are written into the control register area after entering the PLC analog module; the generator set output power is provided by the power transmitter or unit monitoring unit in the generator control cabinet; the opening degree of the main flow valve is provided by the position feedback signal of the electric valve actuator. The central control system reads the above equipment and process operation data at a fixed sampling period and writes it into the operational capacity boundary calculation program. If, within a certain sampling period, the liquid level, power, valve position, or water pump operation feedback experiences a communication interruption, significantly exceeds the hardware range, or fails to generate a valid sample value, the central control system will prioritize using the most recent valid sample value within the preset valid time window. If there is still no usable sample value within the valid time window, the corresponding state variable will be included in the calculation of the operating capacity boundary for this period as 0, and a sampling missing flag will be written into the control system.

[0036] Since water level, power, number of equipment, and valve opening are different types of field data, the central control system first converts these data into interval state values ​​of the same scale. Specifically, the state values ​​of the high-level energy storage tank... The water level is obtained from the relative position of the real-time water level of the high-level energy storage tank within its design allowable water level range; for example, if the lower limit of the design allowable water level corresponds to state value 0, the upper limit of the design allowable water level corresponds to state value 1, and the real-time water level is located at 85% of this range, then... Take 0.85. Main storage tank state value. Using the same processing method, the water level is obtained from the relative position of the real-time water level in the main storage tank within the allowable return water range; for example, if the real-time water level is at 70% of the allowable return water range, then... Take 0.70. Generator set operating status value. It is obtained from the proportion of real-time output power within the rated operating range; for example, if the generator set's current output power reaches 90% of its rated power, then... Take 0.90. Water pump cluster operating status value. This is determined by the ratio of the number of currently operating water pumps to the total number of installed water pumps; for example, if the total number of installed pumps is 1000 and 800 are currently operating, then... The value is 0.80, where the total number of water pumps installed is the fixed installed value in the equipment ledger. For collected values ​​exceeding the safety boundary, the central control system uses the corresponding boundary value in the calculation to ensure that subsequent control judgments fall within the allowable operating range. If the upper and lower limits of the design interval corresponding to a certain state variable are mistakenly written as the same value in the parameter configuration, the central control system will not perform proportional conversion, but will use 0 for the calculation of this cycle and write it into the parameter verification record.

[0037] After completing the above intervalization process, the central control system uses a weighted linear combination to form a comprehensive operational capacity value. The initial source of this formula is the weighted summation method in multi-index decision-making. Its basic idea is to combine several evaluation items with unified scales into a comprehensive evaluation result according to a preset importance ratio. In this scheme, the weighted summation corresponds to the four necessary capacity sources in the closed-loop water cycle power generation process, namely, high-level energy storage capacity, main reservoir return water capacity, power generation release capacity, and pumping water replenishment capacity, so that the calculation results can directly serve the subsequent pumping and storage power generation coordinated control.

[0038] ;

[0039] in, This represents the comprehensive operational capability value, serving as the core state within the operational capability boundary. The status value of the high-level energy storage tank is obtained from the relative position of the values ​​collected by the high-level energy storage tank level sensor within the design allowable water level range; The value representing the status of the main storage tank is obtained from the relative position of the value collected by the main storage tank level sensor within the allowable return water range; This indicates the operating status value of the generator set, which is obtained by the ratio of the generator set's real-time output power to its rated power. This represents the operating status value of the water pump cluster, which is obtained by the ratio of the number of currently operating water pumps to the total number of water pumps installed. , , , This represents the fixed weight corresponding to each state value, which is set according to the engineering operation goals during the system debugging phase, and the total weight must be 1. , , , All are state values ​​between 0 and 1. The state value is also between 0 and 1. The weights are determined during the system commissioning phase. For example, for operating conditions primarily focused on stable power generation, the state of the elevated storage tank and the generator unit's operating state can be assigned higher weights, while the state of the main storage tank and the pumping unit cluster can be assigned secondary weights. The engineering reason for this setting is that the elevated storage tank directly determines the release of hydropower, the generator unit's operating state directly reflects the current energy release load, and the main storage tank and pumping unit cluster primarily reflect continuous replenishment capabilities. If long-term continuous operation is emphasized on-site, the weights of the main storage tank and pumping unit cluster states can be appropriately increased.

[0040] State values ​​of high-level energy storage tanks under a set of typical operating conditions The value is 0.85, which is the state value of the main energy storage tank. The value is 0.70, representing the generator set's operating status. The value is 0.90, representing the operating status of the water pump cluster. The weight is set to 0.80 during the system debugging phase. , , , If the values ​​are 0.30, 0.20, 0.30, and 0.20 respectively, then the central control system obtains the comprehensive operating capacity value according to the above formula. The value is 0.83. This result indicates that the current water-cycle power generation system possesses a high continuous operation capability, and subsequent steps can generate a high-load pumped-storage power generation coordinated operation scheme under this boundary. If the operating state value of the pumping unit cluster under similar operating conditions... If it drops to 0.45, then the comprehensive operating capacity value... Consequently, the load level in the pumped-storage power generation coordinated operation scheme is reduced accordingly, ensuring that the release rhythm of the high-level energy storage tank is consistent with the pumping replenishment capacity. This step ultimately outputs the operational capacity boundary. operational capability boundary Including comprehensive operational capability value And the state values ​​of the high-level energy storage tanks involved in the calculation. State values ​​of the main storage tank Generator set operating status values Operating status values ​​of water pump cluster The next step is to directly use the operational capability boundary. This serves as the input to generate a coordinated operation scheme for pumped-storage power generation.

[0041] S2: Calculate the collaborative load factor based on field data and comprehensive operational capacity values. Convert the collaborative load factor into a collaborative operation plan using a PLC speed table. The PLC speed table is set during the commissioning phase based on the total number of water pumps installed, the sub-cluster division method, the allowable valve opening range, and the allowable load range of the generator set. Specifically, it includes:

[0042] S1 output operating capability boundary Then, the central control system reads The comprehensive operational capability value included State values ​​of high-level energy storage tanks State values ​​of the main storage tank Generator set operating status values Operating status values ​​of water pump cluster The aforementioned state variables are used as the basis for generating a cooperative operation scheme. The direct basis. Among them, Reflecting the overall operational carrying capacity of the current hydro-cycle power generation system, Reflects the release status of the high-level energy storage tank. It reflects the return water support status of the main energy storage tank. Reflects the current energy release operation status of the generator set. This reflects the current replenishment status of the water pump cluster. After the central control system calls these status variables in the PLC or host computer control program, it first determines the coordinated load factor for the current cycle. And then according to The system generates the activation levels of the water pump sub-clusters, the valve opening levels on the power generation side, and the operating rhythm levels, so that the three links of water pumping, energy storage, and power generation are executed in a unified rhythm within the same control cycle.

[0043] Cooperative load factor The calculations are derived from the mathematical concepts of weighted proportional scheduling and deviation penalty. Proportional scheduling is based on determining the operating load level according to the overall system capacity, while deviation penalty is based on reducing control strength when the differences between multiple related states increase, thus suppressing internal system mismatch. In this application, S1 has converted field data from different sources into state values ​​between 0 and 1, thus allowing for comparison of differences between high-level energy storage, main reservoir recharge, power generation release, and pumped water replenishment at the same scale. The central control system uses... As the base load ratio, three matching relationships from the closed-loop water cycle power generation scenario are introduced for correction: First, the state of the high-level energy storage tank. Status of water pump cluster The difference between them is used to reflect whether there is a match between high-level energy storage reserves and water pumping replenishment; secondly, the status of high-level energy storage tanks. Operating status of generator set The differences between them are used to reflect whether there is a match between high-level energy storage reserves and power generation intensity; third, the status of the main energy storage tank. Status of water pump cluster The differences between these parameters reflect whether there is a match between the backwater support capacity and the pumping supply intensity. All three difference items are directly obtained from the state values ​​output by S1. The central control system averages these values ​​to determine the degree of link coordination deviation, and uses a coordination difference correction coefficient. Adjust the impact of this deviation on the base load ratio.

[0044] ;

[0045] in, This represents the coordinated load factor, used to determine the coordinated operation scheme for pumped-storage power generation in this cycle. Load level; This represents the overall operational capability value obtained from S1; The state value of the high-level energy storage tank obtained by S1 is derived from the relative position of the real-time water level of the high-level energy storage tank within the design allowable water level range. The state value of the main storage tank obtained by S1 is derived from the relative position of the real-time water level of the main storage tank within the allowable return water range. The generator set operating status value obtained from S1 is derived from the ratio of the generator set's real-time output power to its rated power. The value representing the operating status of the water pump cluster obtained by S1 is derived from the ratio of the number of currently operating water pumps to the total number of water pumps installed. This represents the coordination difference correction coefficient, which is written into the PLC parameter area during the commissioning phase. The value is set according to the pipeline pressure-bearing capacity, water tank storage capacity, and allowable load changes of the unit. , , , , and All values ​​are used in the calculation as proportions between 0 and 1. The calculation is also carried out according to a ratio between 0 and 1 for subsequent gear mapping; when the calculation result is lower than 0, the central control system participates in subsequent calculations as 0, and when the calculation result is higher than 1, the central control system participates in subsequent calculations as 1. This formula is derived from "base load ratio multiplied by collaborative correction term", where the base load ratio is... The collaborative correction term is the part within parentheses; when the differences among the three matching relations are small, the collaborative correction term is close to 1. near As the difference in any matching relationship increases, the co-correction term decreases. This reduces the intensity of water pumping and power generation, prompting the control system to proactively decrease these operations.

[0046] In obtaining Afterwards, the central control system will Convert into an executable collaborative operation scheme This conversion is implemented in engineering using a PLC speed control table. During the commissioning phase, the speed control table is set based on the total number of water pumps installed, the sub-cluster division method, the allowable valve opening range, and the allowable load range of the generator set. For example, if the total number of water pumps installed is 1000, and each sub-cluster consists of 100 pumps, then... When the value is in the range of 0.80 to 0.90, the central control system will set the water pump to operate in 8 sub-clusters. When the value is between 0.60 and 0.70, the water pump will be set to operate in 6 sub-clusters. During gear mapping, the central control system will execute according to the preset interval boundaries, with the lower boundary of the interval included in the current gear, and the maximum gear including the upper boundary of 1; if the current... Because the parameter update did not hit any valid range in the PLC range table, the central control system will take a value no higher than... The most recent low setting is used as the execution setting for this cycle. The generator-side valve opening setting is related to... Synchronous changes, and combinations and Apply amplitude limiting: when higher and When maintaining a high level, the turbine inlet valve enters a higher opening position; when When operating at a lower speed, the valve opening level decreases accordingly, matching the power generation release rhythm with the return water support capacity. The operating rhythm level determines the engagement and disengagement intervals of the pumping unit sub-clusters. When the temperature is high, use shorter intervals to introduce the drugs in groups. When reducing water flow, longer intervals or phased withdrawals are used to minimize hydraulic fluctuations caused by simultaneous large changes at both the pumping and power generation ends.

[0047] In a set of typical operating conditions, S1 output , , , , Debugging phase settings The central control system first calculates three difference terms. It is 0.05. It is 0.05. The value is 0.10, and the average of the three difference terms is 0.067; the co-correction term is... That is, approximately 0.967; therefore Approximately That is, 0.80. Based on this, the central control system calls the PLC speed table, sets the water pump cluster to operate as 8 sub-clusters, sets the generator-side valves to a higher opening level, and sequentially engages the sub-clusters according to a preset interval. If in the next control cycle... It remains at 0.83, but the state value of the main storage tank... It dropped to 0.45, and , , If these values ​​remain unchanged, the three difference terms become 0.05, 0.05, and 0.35, averaging to 0.15; the co-correction term becomes... That is, 0.925; It becomes approximately 0.77. At this point, the central control system will reduce the pumping unit's operating level from 8 sub-clusters to 7 sub-clusters or enter a restricted operation level, and reduce the opening level of the power generation side valves to ensure that the release rhythm of the high-level energy storage tank is consistent with the return water support capacity of the main energy storage tank.

[0048] This step outputs the collaborative operation plan. Its content includes the coordinated load factor. The operating levels of the water pump sub-clusters, the valve opening levels on the power generation side, and the operating rhythm levels. Coordinated load factor. Based on operational capability boundary Calculated and followed The settings for the water pump sub-cluster are written into the PLC control area; the activation levels are determined by... The interval position in the PLC position table is determined to control the number of sub-clusters participating in water lifting in this cycle; the valve opening position on the power generation side is determined by... and combined and Determined, used to control the water intake of the turbine; operating rhythm gears are determined by... The corresponding load level is determined to control the start-up and shutdown intervals of the water pump sub-clusters. The central control system will... The commands are written into the PLC control area, and the PLC sends control commands to the water pump control cabinet, the electric valve actuator, and the generator control unit. The next step is to implement a collaborative operation scheme. To establish a benchmark, the actual on-site execution results will be compared with... The system compares the activation level of the water pump sub-cluster, the valve opening level on the power generation side, and the operating rhythm level to determine the execution deviation status after coordinated operation.

[0049] S3: Read the target number of water pumps in operation, the target valve opening degree on the power generation side, and the target operating rhythm determined in the collaborative operation plan, and calculate the execution deviation value. Compare the execution deviation value with the preset deviation range to form the execution deviation level and deviation source information, specifically including:

[0050] Central control system collaborative operation scheme in S2 After issuing and completing an execution observation cycle, read The target number of water pumps already in operation has been determined in China. Target valve opening on the power generation side and target operating rhythm These three target quantities will be used as the criteria for judgment in this step. It is calculated from the input level of the water pump sub-cluster in S2. For example, 8 sub-clusters running correspond to 800 water pumps. It is calculated from the opening position of the generator side valve in S2. For example, a higher opening position can correspond to 0.80. This value, calculated from the operating rhythm level in S2, represents the target action interval of adjacent water pump sub-clusters; for example, it can be 10. The central control system then reads the actual execution results from the field, including the actual number of pumps in operation. The actual valve opening degree is obtained by analyzing the operation feedback signals from each water pump control cabinet using the PLC. The actual operating rhythm is obtained from the position feedback signal of the electric valve actuator. The PLC records the corresponding values ​​of the action intervals between the start-up feedback of adjacent water pump sub-clusters. If a certain target execution quantity does not generate effective feedback within the current execution observation period, the central control system treats the execution quantity as unmet and retains a feedback missing marker in the deviation source record. Therefore, the coordinated operation scheme output by S2... The water lifting scale, valve opening degree, and operation rhythm are all converted into verifiable target execution quantities in this step, and form a one-to-one correspondence with the on-site feedback.

[0051] The deviation calculation used in this step is derived from the relative error evaluation method in engineering control. Its original idea is to use the ratio of the difference between the actual executed value and the target executed value to the target executed value to represent the degree of execution deviation. This method is suitable for determining whether a single execution object has deviated from the target. However, the special characteristic of a water-cycle power generation system is that the pumping end and the power generation and release end work together on the high-level energy storage tank. The misalignment between the pumping unit's activation ratio and the valve opening ratio directly affects the consumption rate and return rhythm of the high-level energy storage tank. Therefore, this step adds a coupling deviation term between the pumping side and the power generation and release side to the relative error evaluation, merging the single-point execution deviation and the closed-loop water circulation link deviation into an execution deviation state value. Specifically, the first three items represent deviations in pumping operation, valve opening, and operating rhythm, respectively. The fourth item represents the synchronization deviation between the completion ratio of the pumping side and the completion ratio of the power generation and energy release side, enabling the system to identify the working condition where "a single action is close to the target, but the pumping and energy release are not synchronized as a whole."

[0052] ;

[0053] in, This indicates the deviation value from the execution state, used to represent the collaborative operation scheme. The overall degree of deviation after on-site execution; This indicates the target number of water pumps to be in operation, as determined by S2, based on the collaborative operation plan. The input level of the water pump sub-cluster was calculated. This indicates the actual number of water pumps in operation on site, which is obtained by the PLC counting the feedback signals from the water pump control cabinet. This indicates the target valve opening on the power generation side determined by S2, as specified in the coordinated operation plan. The valve opening level is calculated from the input. This indicates the actual valve opening at the site, obtained from feedback by the electric valve actuator. This indicates the target operating rhythm determined by S2, which is determined by the collaborative operation plan. The operating rhythm gears are calculated from the speed. This indicates the actual operating rhythm on site, which is obtained by the PLC based on the time interval between the start-up feedback of adjacent water pump sub-clusters; , , , This represents the deviation weight, written into the PLC parameter area during the system debugging phase. These weights correspond to the degree of influence of the pump's operation, valve opening, operating rhythm, and the synchronization of water pumping and energy release on system stability. Each deviation term in the formula is derived from the ratio of the actual value to the target value, and the calculated result represents the deviation state value at the same scale. At that time, the corresponding terms in the first and fourth items according to" Take 0, When the caliber of "1" is used in the calculation, At that time, the corresponding terms in the second and fourth items according to" Take 0, When the caliber of "1" is used in the calculation, When, the third item is selected according to " Take 0, Use the "1" caliber in the calculation.

[0054] During on-site execution, the central control system calculates according to the control cycle. This is combined with the source of the deviation to form a deviation level. For example, the collaborative operation scheme generated by S2. Regulation , , The on-site feedback result was , , If set during the debugging phase , , , The deviation of the water pump input is then... The valve opening deviation is The running rhythm deviates from the standard. The coupling deviation of water extraction and energy release is as follows: After substituting, we get This state corresponds to a slight deviation in execution; the central control system maintains the current collaborative operation plan. Continue to observe the deviation trend. If some water pump sub-clusters fail to start under the same target conditions, the on-site feedback will be as follows: , , Then, the deviation of the water pump's operation is 0.25, the valve opening deviation is 0.025, the operating rhythm deviation is 0.80, and the water pumping and energy release coupling deviation is... After substituting, we get The results indicate that the pumping side is underperforming and operating at a significantly lagging pace, while the power generation side valves are still close to their target opening. This indicates a misalignment between the system's supply and energy release. The next step could be to implement local isolation, load reduction, or switching control on the relevant pumping sub-clusters or flow paths based on this information.

[0055] Central control system will The deviation level is determined by comparing the data with a preset deviation range. Specifically, the first deviation threshold is less than the second deviation threshold. When the deviation falls below the first deviation threshold, the system determines the collaborative operation scheme. Execution is normal; When the deviation falls between the first and second deviation thresholds, the system identifies an observable deviation and records the source of the deviation. When the deviation exceeds the second deviation threshold, the system determines that there is a significant execution deviation and writes the deviation level into the control system status register area; when When a deviation falls precisely on the threshold boundary, the central control system merges it into a higher-level deviation category. The source of deviation is determined by the deviation term contributing the most in the formula. For example, if the deviation percentage of the pumping unit input is the highest, the source is identified as insufficient execution on the pumping side; if the deviation percentage of the valve opening is the highest, the source is identified as valve execution lag; if the deviation percentage of the operating rhythm is the highest, the source is identified as abnormal sub-cluster startup rhythm; if the deviation percentage of the pumping and energy release coupling is the highest, the source is identified as asynchronous supply and energy release. If multiple deviation terms contribute the most, the system records them together as a composite deviation source. This step ultimately outputs the execution deviation status information, where the execution deviation status value is denoted as... And simultaneously record with The corresponding deviation level identifier and deviation source information. The next step directly uses the deviation status information as input to determine the specific execution method for local isolation, load reduction, or branch switching.

[0056] S4: Based on the deviation level and the source of the deviation information, after performing local isolation according to the preset control strategy, calculate the continuous operation intensity coefficient, and convert the continuous operation intensity coefficient into a continuous operation control instruction set, specifically including:

[0057] After the central control system outputs the execution deviation status information in S3, it reads the execution deviation status value from it. The deviation level identifier and deviation source information are used as direct inputs for this step. Execute the deviation status value. Calculated by S3, the deviation level indicator is determined by... Compared with the preset deviation threshold, the deviation source information is determined by the deviations that contribute significantly from the following in S3: pumping unit operation deviation, valve opening deviation, operating rhythm deviation, and pumping-energy release coupling deviation. Based on this information, the central control system determines the local isolation targets and continuous operation modes: when the deviation source points to the pumping side, the system locates the pumping unit sub-clusters that have not been activated as instructed or have abnormal operating feedback; when the deviation source points to the valve side, the system locates the branch valves whose opening feedback deviates significantly from the target opening; when the deviation source points to the operating rhythm, the system locates the sub-clusters whose start-up or exit time is significantly delayed; when the deviation source points to the pumping-energy release coupling relationship, the system simultaneously adjusts the pumping unit operation scale and the turbine inlet valve opening to bring the replenishment and release of the high-level energy storage tank back to a consistent rhythm.

[0058] After identifying the source of the deviation, the central control system executes control according to the sequence of "first isolating the source of the abnormality, then maintaining the healthy operation of the link". For deviations on the water pumping side, the PLC reads the operation feedback signals and current status of each water pump control cabinet, marks the water pumps that have not completed startup, lost operation feedback, or have continuously abnormal current as isolation objects, and stops counting them in subsequent operation combinations; for deviations on the valve side, the PLC reads the actual opening feedback of the electric valve actuator, marks the branch where the valve with delayed response or continuous opening deviation exists as a restricted branch, and sends a maintain or revert opening command to the valve of the restricted branch; for deviations in operating rhythm, the PLC adjusts the startup or shutdown interval of subsequent sub-clusters according to the actual action completion time of adjacent sub-clusters; for deviations in water pumping and energy release coupling, the central control system synchronously compresses the water pump operation combination and the target opening of the turbine inlet valve, so that the water pumping replenishment ratio and the power generation release ratio are close again in the next control cycle. If, after partial isolation, there are no available healthy water pump sub-clusters, no available flow path branches, or the minimum stable operating conditions of the unit are no longer met, the central control system will no longer maintain the upgraded operating target, but will execute according to the minimum continuous operation combination set during the system commissioning phase. If even the minimum continuous operation combination cannot be met, a continuous operation exit instruction for this cycle will be written to the PLC, and the valves will be returned to the minimum safe opening. All of the above actions are completed through the equipment number, branch number, and control instructions in the PLC control area, and output to the water pump control cabinet, electric valve actuator, and generator control unit.

[0059] After partial isolation, the central control system needs to determine the strength of continued operation of the remaining system. This calculation employs a linear interpolation approach from mathematics, the original form of which involves determining an intermediate value between two given endpoints based on a proportional parameter. In this application, the cooperative operation scheme output by S2 is... Cooperative load factor recorded in As the original operating intensity ratio The minimum intensity ratio that the system is allowed to maintain continuous operation. As the load reduction endpoint, the execution deviation value obtained from S3 will be used. This serves as the interpolation ratio. This forms the continuous operation intensity coefficient. This ensures that when the deviation is small, the operating intensity approaches the original operating state, and when the deviation is large, the operating intensity approaches the minimum continuous operating state. The derivation process corresponds to: when... At that time, the system execution result was consistent with the collaborative operation plan. Pick ;when When it increases, proportionally Convergence; when When the value approaches 1, the system enters the vicinity of the minimum continuous operating intensity. The specific calculation is as follows:

[0060] ;

[0061] in, This represents the continuous operation intensity coefficient after partial isolation, used to determine the operational scale of the remaining healthy equipment; This indicates the execution deviation value output by S3; This indicates the original operating intensity ratio of the current control cycle, determined by the coordinated operation scheme of S2. Cooperative load factor recorded in Obtain; This indicates the minimum intensity ratio at which the system is allowed to maintain continuous operation. It is set during the system commissioning phase based on the minimum stable operation requirements of the hydro-generator unit, the minimum effective operating combination of the pump, and the water pool circulation maintenance conditions. , , All are proportional values, therefore It is also a proportional value; when used for interpolation of this formula, if S3 yields... If the value is greater than 1, the central control system will be counted as 1 in the calculation. If the value is less than 0, it is included in the calculation as 0. This calculation ensures that the scale of operation after isolation corresponds to the degree of deviation from the execution, reducing the risk of new hydraulic disturbances caused by sudden changes in operational intensity after the occurrence of local anomalies.

[0062] get Then, the central control system translates it into specific actions. The water pump side follows... Determine the number of water pumps to remain in operation, for example, if the total installed capacity of the system is 1000 units and... At that time, the target operating scale is 650 units. If the system uses 100 units as a sub-cluster, the PLC prioritizes retaining sub-clusters with normal operating feedback, stable start-up completion time, and whose branches are not marked as restricted, and issues exit commands to redundant or abnormal sub-clusters. When the target operating scale is not an integer multiple of the number of complete sub-clusters, the PLC first retains an integer number of complete healthy sub-clusters, and then supplements the remaining target scale in a fixed order within the next priority healthy sub-clusters. The generator side will adjust the PLC's speed table accordingly. Mapped to the corresponding controlled valve opening level, for example, the current target valve opening on the power generation side is 0.80. When this occurs, the PLC calls the controlled opening position corresponding to 0.65 and executes it step by step through the electric valve actuator; if If the valid range in the current valve position table is not found, the PLC will select a value no higher than [the specified value]. The most recent low valve opening setting. Regarding the operating rhythm, if the deviation of S3 is due to abnormal operating rhythm, the PLC will extend the interval of subsequent sub-cluster actions, for example, from 10 to 15, so that the state changes on the water pumping side and the power generation side remain gradual.

[0063] In a typical control cycle, S3 output S2 collaborative operation scheme Cooperative load factor recorded in Therefore, the original operating intensity ratio System debugging phase settings The central control system is then calculated using the above formula. Based on this, the system adjusted the target operating scale of the water pumps from approximately 800 units to approximately 650 units. If each cluster consists of 100 units, six complete sub-clusters are retained, and some healthy water pumps are selected to supplement the target scale according to the distribution of branch lines on site. Abnormal sub-clusters are isolated or terminated by the PLC. The opening degree of the generator-side valves is adjusted from the original higher opening degree level to the same level as the PLC's position table. At the corresponding controlled opening position, the generator set enters a reduced-load continuous operation state. If S3 is recalculated in the next cycle... Then in , conditions, When the value is reduced to 0.75, the central control system can gradually restore the number of healthy water pump sub-clusters in operation and the valve opening, allowing the system to smoothly return from isolated operation to a higher load operation state.

[0064] This step ultimately outputs a set of continuous operation control instructions. This instruction set This includes the partially isolated objects, the pumping unit combinations that remain operational, the adjusted valve openings on the power generation side, and the adjusted operating rhythm parameters. The partially isolated objects are determined by the deviation source output by S3, and the pumping unit combinations that remain operational are determined by... With the feedback status of the healthy sub-cluster determined, the adjusted opening degree of the power generation side valve is... The adjusted running rhythm parameters, obtained through PLC position table mapping, are determined by the source of deviation and To be determined jointly. The central control system will The commands are written into the PLC control area, and the PLC sends actual control commands to the water pump control cabinet, electric valve actuator and generator control unit, so that the fully automatic water circulation power generation system can continue to maintain controlled circulation power generation under local abnormal conditions.

[0065] refer to Figure 2 As shown, in another aspect of this application embodiment, a fully automatic water circulation power generation control system is also proposed, including:

[0066] The comprehensive capacity calculation module is used to perform interval processing on-site data of the power plant and then calculate the comprehensive operating capacity value of the power plant based on the on-site data.

[0067] The operation plan generation module is used to calculate the collaborative load coefficient based on field data and comprehensive operation capacity value, and convert the collaborative load coefficient into a collaborative operation plan through the PLC level table. The PLC level table is set during the commissioning stage according to the total number of water pumps installed, the sub-cluster division method, the valve allowable opening range, and the generator set allowable load range.

[0068] The deviation state calculation module is used to read the target number of water pumps in operation, the target valve opening degree on the power generation side, and the target operating rhythm determined in the collaborative operation plan, and calculate the execution deviation state value. The execution deviation state value is compared with the preset deviation interval to form the execution deviation level and deviation source information.

[0069] The operation control module is used to perform local isolation according to a preset control strategy based on the deviation level and the source of deviation information, calculate the continuous operation intensity coefficient, and convert the continuous operation intensity coefficient into a continuous operation control instruction set.

[0070] The above embodiments are merely descriptions of preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A fully automatic water circulation power generation control method, characterized in that, include: After performing interval processing on the field data of the power plant, the comprehensive operating capacity value of the power plant is calculated based on the field data; The collaborative load coefficient is calculated based on on-site data and comprehensive operating capacity values. The collaborative load coefficient is then converted into a collaborative operation scheme using a PLC speed table. The PLC speed table is set during the commissioning phase based on the total number of water pumps installed, the sub-cluster division method, the allowable valve opening range, and the allowable load range of the generator set. The target number of water pumps in operation, the target valve opening degree on the power generation side, and the target operating rhythm determined in the collaborative operation plan are read, and the execution deviation state value is calculated. The execution deviation state value is compared with the preset deviation range to form the execution deviation level and deviation source information. Based on the deviation level and the source of the deviation information, after performing local isolation according to the preset control strategy, the continuous operation intensity coefficient is calculated, and the continuous operation intensity coefficient is converted into a continuous operation control instruction set.

2. The fully automatic water circulation power generation control method according to claim 1, characterized in that, The on-site data includes the number of operating water pumps, the water level of the high-level energy storage tank, the water level of the main energy storage tank, the output power of the generator set, and the opening degree of the main flow valve.

3. The fully automatic water circulation power generation control method according to claim 1, characterized in that, The continuous operation control instruction set includes locally isolated objects, water pump combinations that remain in operation, adjusted power generation side valve openings, and operation rhythm parameters.

4. The fully automatic water circulation power generation control method according to claim 1, characterized in that, The comprehensive operational capability value is calculated and generated using the status values ​​of the high-level energy storage tank, the main energy storage tank, the generator operation status, the water pump cluster operation status, and fixed weights.

5. The fully automatic water circulation power generation control method according to claim 1, characterized in that, The coordinated load coefficient is calculated and generated by considering the comprehensive operating capacity value, the status value of the high-level energy storage tank, the status value of the main energy storage tank, the operating status value of the generator, and the operating status value of the water pump cluster.

6. The fully automatic water circulation power generation control method according to claim 1, characterized in that, The execution deviation state value is calculated and generated by the target number of water pumps in operation, the actual number of water pumps in operation on site, the target valve opening on the power generation side, the actual valve opening on site, the target operating rhythm, the actual operating rhythm, and the execution deviation weight.

7. The fully automatic water circulation power generation control method according to claim 1, characterized in that, The continuous operation intensity coefficient is calculated by taking the deviation state value, the original operation intensity ratio of the current control cycle, and the minimum intensity ratio that allows continuous operation to be maintained.

8. The fully automatic water circulation power generation control method according to claim 1, characterized in that, The step of performing local isolation according to a preset control strategy based on the deviation level and the source of the deviation information specifically includes: For deviations on the water pumping side, the PLC reads the operation feedback signals and current status of each water pump control cabinet, marks the water pumps that have not completed startup, lost operation feedback, or have continuously abnormal current as isolated objects, and stops counting them in subsequent operation combinations. For valve side deviation, the PLC reads the actual opening feedback of the electric valve actuator, marks the branch where the valve with delayed response or continuous opening deviation exists as a restricted branch, and sends a hold or retract opening command to the valve in the restricted branch; If the operating rhythm deviates, the PLC adjusts the start or stop interval of the subsequent sub-clusters according to the actual completion time of the actions of the adjacent sub-clusters. In case of deviation in the coupling of water lifting and energy release, the central control system synchronously compresses the operating combination of the water lifting machine and the target opening degree of the turbine inlet valve.

9. The fully automatic water circulation power generation control method according to claim 2, characterized in that, The number of operating water pumps is determined by the status of the operating contactors and current acquisition signals in the control cabinets of each water pump, and the number of water pumps in effective operation is counted by the PLC digital input points. The water levels of the high-level energy storage tank and the main energy storage tank are acquired by fixedly installed liquid level sensors. The output power of the generator set is provided by the power transmitter or the unit monitoring unit in the generator control cabinet. The opening degree of the main flow valve is provided by the position feedback signal of the electric valve actuator.

10. A fully automatic water circulation power generation control system, characterized in that, include: The comprehensive capacity calculation module is used to perform interval processing on-site data of the power plant and then calculate the comprehensive operating capacity value of the power plant based on the on-site data. The operation plan generation module is used to calculate the collaborative load coefficient based on field data and comprehensive operation capacity value, and convert the collaborative load coefficient into a collaborative operation plan through the PLC level table. The PLC level table is set during the commissioning stage according to the total number of water pumps installed, the sub-cluster division method, the valve allowable opening range, and the generator set allowable load range. The deviation state calculation module is used to read the target number of water pumps in operation, the target valve opening degree on the power generation side, and the target operating rhythm determined in the collaborative operation plan, and calculate the execution deviation state value. The execution deviation state value is compared with the preset deviation interval to form the execution deviation level and deviation source information. The operation control module is used to perform local isolation according to a preset control strategy based on the deviation level and the source of deviation information, calculate the continuous operation intensity coefficient, and convert the continuous operation intensity coefficient into a continuous operation control instruction set.

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