A sewage plant water energy collaborative regulation system embedded with micro water circulation and hydraulic energy storage

Abstract

This application discloses a wastewater treatment plant water-energy coordinated control system embedded with micro-water circulation and hydraulic energy storage. The system includes: a coordinated control system, used to generate a scheduling strategy for multiple future control cycles based on predicted wastewater treatment volume data for multiple future control cycles, predicted electricity prices for multiple future control cycles, current water level status of high-level water tanks and low-level water storage facilities, current reclaimed water quality, and instantaneous flow rate of each water usage point, with the goal of minimizing total electricity cost; a micro-water circulation treatment unit, used to treat polluted water to obtain reclaimed water according to the polluted water treatment volume in the scheduling strategy, using electricity provided by the power grid; and a hydraulic energy storage system, used to perform energy storage and release operations according to the scheduling strategy, as well as gravity flow supply and other coordinated allocation operations of process water to water usage points with process water demand using water from the high-level water tank.

Description

Technical Field

[0001] This application belongs to the field of wastewater treatment and comprehensive energy utilization technology, specifically relating to a wastewater treatment plant water energy coordinated control system that incorporates micro water circulation and hydraulic energy storage. Background Technology

[0002] Wastewater treatment plants are energy-intensive facilities. They contain reusable, low-pollution water resources, such as effluent from secondary sedimentation tanks. However, in the traditional model, water resource utilization and energy management are independent. The operation of high-energy-consuming equipment lacks linkage with electricity price signals, and when participating in grid demand response, there is a contradiction between process safety and response flexibility. Traditional large-scale hydroelectric energy storage power stations rely on specific geographical conditions and are difficult to apply directly to wastewater treatment plant scenarios.

[0003] Therefore, in existing technologies, the "water-saving" benefits achieved by wastewater treatment plant reclaimed water and the "energy-saving" benefits achieved by water source heat pump technology are separate. Even if they are applied simultaneously in the same plant area, there is a lack of synergistic optimization, and the superimposed effect of "water-saving" and "energy-saving" cannot be achieved. Summary of the Invention

[0004] The purpose of this application is to provide a wastewater treatment plant water-energy coordinated control system that integrates micro-water circulation and hydraulic energy storage, organically combining the plant's reclaimed water circulation with distributed pumped storage to achieve coordinated optimization of water treatment and energy dispatch, thereby solving the above-mentioned problems.

[0005] To solve the above-mentioned technical problems, this application is implemented as follows: In a first aspect, embodiments of this application provide a wastewater treatment plant water energy coordinated control system embedding micro-water circulation and hydraulic energy storage, the system comprising: The collaborative control system is used to generate a scheduling strategy for the multiple future control cycles based on the predicted sewage treatment volume, predicted electricity price for the multiple future control cycles, current water level status of the high-level water tank and low-level water storage facilities, current reclaimed water quality, and instantaneous flow rate of each water point, with the goal of minimizing total electricity cost. The scheduling strategy is used to control the start-up and shutdown and treatment volume of the micro water circulation unit, control the operating conditions of the reversible water pump turbine, control the start-up and shutdown and speed of the variable frequency booster pump, and control the opening and closing of valves at multiple water points. The micro-water circulation treatment unit is used to treat polluted water to obtain reclaimed water by using electricity provided by the power grid according to the polluted water treatment volume in the scheduling strategy. A hydroelectric energy storage system is used to pump reclaimed water from the low-level water storage facility to the high-level water tank when the scheduling strategy includes energy storage operation; to release the reclaimed water in the high-level water tank to generate electricity and then feed the generated electricity into the power grid when the scheduling strategy includes energy release operation; and to use the water in the high-level water tank to supply water to water points with process water demand by gravity flow when the scheduling strategy includes a first process water collaborative allocation operation. The first process water collaborative allocation operation means that process water collaborative allocation is carried out when there is process water demand and the water level in the high-level water tank meets the gravity water supply conditions.

[0006] Optionally, the coordinated control system is further configured to determine whether there is a response signal for power grid dispatching demand, and if there is a response signal for power grid dispatching demand, determine the response time period for power grid dispatching demand; The hydroelectric energy storage system is also used to pump reclaimed water from the low-level water storage facility to the high-level water tank before the power grid dispatch demand response period. The hydroelectric energy storage system is also used to generate electricity through the reversible pump-turbine in a manner of continuous power regulation during the grid dispatch demand response period. The collaborative control system is also used to generate a new scheduling strategy after the power grid dispatch demand response period, based on the predicted electricity price and the predicted wastewater treatment volume for multiple future control periods after the power grid dispatch demand response period. The hydraulic energy storage system is used to pump reclaimed water from the low-level water storage facility to the high-level water tank when the new scheduling strategy includes energy storage operation.

[0007] Optionally, the hydroelectric energy storage system is also used for: When the scheduling strategy includes a second process water coordinated allocation operation, the gravity flow valve of the high-level water tank is closed, and the reclaimed water in the reclaimed water storage tank is drawn by the variable frequency booster pump to supply water to the water points with process water demand. The second process water collaborative allocation operation refers to the collaborative allocation of process water when there is a demand for process water and the water level of the elevated water tank does not meet the gravity water supply conditions.

[0008] Optionally, the hydraulic energy storage system is also used for: When the scheduling strategy includes the third process water collaborative allocation operation, during the energy storage operation of the hydraulic energy storage system, the reclaimed water in the high-level water tank or the reclaimed water in the reclaimed water storage tank is simultaneously used to supply water to the water points with process water demand by using the reclaimed water in the high-level water tank or by using the variable frequency booster water pump. The third process water collaborative allocation operation refers to the water point that has process water demand and that requires instantaneous flow rate for filter backwashing.

[0009] Optionally, the micro-water circulation treatment unit is connected to the secondary sedimentation tank of the main treatment line of the sewage treatment plant. The micro-water circulation treatment unit also includes an artificial wetland and a low-pressure membrane filtration assembly. The low-pressure membrane filtration assembly is used to generate primary reclaimed water, the artificial wetland is used to generate secondary reclaimed water, and the secondary sedimentation tank is used to generate tertiary reclaimed water. The hydraulic energy storage system is also used to supply water to water points with process water demand by gravity flow through primary and / or secondary reclaimed water in the high-level water tank when the scheduling strategy is a first process water collaborative allocation operation. The hydraulic energy storage system is also used to, when the scheduling strategy is a second process water coordinated allocation operation, close the gravity flow valve of the high-level water tank and start the variable frequency booster pump to draw the secondary reclaimed water from the reclaimed water storage tank to supply water to the water points with process water demand. The hydraulic energy storage system is also used to, when the scheduling strategy is energy storage operation, switch the reversible pump turbine to pump operation during periods of low electricity prices, and pump the tertiary reclaimed water in the low-level water storage facility to the high-level water tank.

[0010] Optionally, the collaborative control system is further used for: A target function is set for the stated objective, and the target function is:

[0011] in, p ( k () represents the predicted electricity price for the k-th future control period. This represents the amount of electricity purchased from the grid, and Δt represents the duration of a future control cycle. This refers to the benefits gained through load regulation to reduce electricity costs and participation in grid dispatch. Constraints are set for the target, including: water level safety constraints, power grid dispatch demand response constraints, process safety constraints, equipment operation constraints, and water balance constraints.

[0012] Optionally, one end of the micro-water circulation treatment unit is connected to the secondary sedimentation tank of the main treatment line of the sewage treatment plant. The micro-water circulation treatment unit includes an artificial wetland and a low-pressure membrane filter assembly connected in sequence. The reclaimed water obtained after treatment by the micro-water circulation treatment unit is stored in a reclaimed water storage tank.

[0013] Optionally, the hydraulic energy storage system includes an elevated water tank, a low-level water storage facility, a reversible pump-turbine, and a variable frequency booster pump; the low-level water storage facility is connected to the reclaimed water storage tank via a pipeline; the reversible pump-turbine is installed on the connecting pipeline between the elevated water tank and the low-level water storage facility; the motor of the reversible pump-turbine is connected to the power grid via a frequency converter and a two-way switch; the outlet pipeline of the elevated water tank is connected to the main pipeline of the process water distribution network.

[0014] Optionally, the process water distribution network includes a main pipeline and multiple branch pipelines. The main pipeline is connected to the high-level water tank and variable frequency booster pump of the hydraulic energy storage system. The multiple branch pipelines correspond to multiple water usage points. Each branch pipeline is equipped with a control valve, which leads to the water usage point corresponding to that branch pipeline. The branch pipelines of water usage points that require pressurized water supply are also connected to the variable frequency booster pump, which is connected to the reclaimed water storage tank.

[0015] Optionally, the collaborative control system includes a collaborative controller. The input control line of the collaborative controller is used to receive predicted data of sewage treatment volume for multiple future control cycles issued by the influent load prediction server, predicted electricity prices for multiple future control cycles issued by the power grid system, the current water level status of the high-level water tank and low-level water storage facility issued by the water level sensor, the instantaneous flow rate of each water use point, and the current water quality of the reclaimed water issued by the water quality sensor. The output control line of the collaborative controller is respectively connected to the influent pump of the micro water circulation treatment unit, the reversible water pump turbine, the variable frequency booster pump, and the control valves of each water use point.

[0016] This application provides a wastewater treatment plant water-energy coordinated control system embedded with micro-water circulation and hydraulic energy storage. The system includes: a coordinated control system, used to generate a scheduling strategy for the multiple future control cycles based on predicted wastewater treatment volume data for multiple future control cycles, predicted electricity prices for multiple future control cycles, current water level status of high-level water tanks and low-level water storage facilities, current reclaimed water quality, and instantaneous flow rate at each water point, with the goal of minimizing total electricity cost. The scheduling strategy is used to control the start / stop and treatment volume of the micro-water circulation unit, control the operating conditions of the reversible pump-turbine, control the start / stop and speed of the variable frequency booster pump, and control the opening and closing of valves at multiple water points; and a micro-water circulation treatment unit, used to control the polluted water in the scheduling strategy. The system comprises: a treatment capacity, wherein the polluted water is treated to obtain reclaimed water using electricity supplied by the power grid according to the polluted water treatment capacity; a hydroelectric energy storage system, used to pump the reclaimed water from the low-level water storage facility to the high-level water tank when the scheduling strategy includes energy storage operation; releasing the reclaimed water from the high-level water tank to generate electricity and then feeding the generated electricity into the power grid when the scheduling strategy includes a first process water collaborative allocation operation; and using the water in the high-level water tank to supply water to water points with process water demand by gravity flow when the scheduling strategy includes a first process water collaborative allocation operation; the first process water collaborative allocation operation means that process water is collaboratively allocated when there is process water demand and the water level in the high-level water tank meets the gravity water supply conditions.

[0017] The technical solution of this application deeply integrates the micro-water circulation treatment unit, the hydraulic energy storage system, and the process water distribution network into a unified architecture. This allows the reclaimed water treated by the micro-water circulation treatment unit to simultaneously serve as a process medium in the process water distribution network to achieve water conservation, and as an energy storage medium in the hydraulic energy storage system to achieve energy conservation. This achieves the physical integration of the water treatment process and the energy conversion process. Furthermore, the collaborative control system can generate future scheduling strategies based on current and predicted data and distribute them to various parts of the system. This approach comprehensively considers the influent load of the micro-water circulation treatment unit, the electricity price signal of the power grid, and the water level status of the energy storage system. It generates future scheduling decisions in real time to adjust the water production of the micro-water circulation treatment unit, the charging and discharging timing and power of the hydraulic energy storage system, and the source of process water. This achieves the goal of minimizing the overall electricity cost, reducing operating costs and realizing the synergistic optimization of water treatment and energy scheduling. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of a wastewater treatment plant water energy coordinated control system with embedded micro water circulation and hydraulic energy storage, provided in one embodiment of this application; Figure 2This is a schematic flowchart of a wastewater treatment plant water energy synergistic control method embedding micro water circulation and hydraulic energy storage according to an embodiment of this application; Figure 3 This is a schematic diagram of the framework of a wastewater treatment plant water energy coordinated control device embedded with micro water circulation and hydraulic energy storage, provided in one embodiment of this application; Figure 4 A schematic diagram of the hardware structure of an electronic device to implement an embodiment of this application. Detailed Implementation

[0019] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0020] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0021] The following description, in conjunction with the accompanying drawings, details a wastewater treatment plant water energy coordinated control system embedded with micro-water circulation and hydraulic energy storage, provided by the embodiments of this application, through specific implementations and application scenarios.

[0022] Figure 1 This is a schematic diagram of a wastewater treatment plant water energy coordinated control system with embedded micro water circulation and hydraulic energy storage, provided in one embodiment of this application.

[0023] refer to Figure 1 According to Table 1, this application provides a wastewater treatment plant water-energy coordinated control system embedded with micro-water circulation and hydraulic energy storage. It is particularly suitable for utilizing treated reclaimed water within the plant for energy storage and scheduling, thereby achieving energy conservation, consumption reduction, and flexible operation of the wastewater treatment plant. The system includes: the main treatment line of the wastewater treatment plant, a micro-water circulation treatment unit, a hydraulic energy storage system, a process water distribution network, and a coordinated control system.

[0024] Table 1: System Component Description

[0025] Micro-water circulation treatment unit: includes low-carbon process modules (such as constructed wetlands and low-pressure membrane modules) for short-range deep treatment of the effluent from the secondary sedimentation tank (which separates mud and water, clarifies the mixed liquor, concentrates the sludge, and returns the separated sludge to the biological treatment section), producing reclaimed water for the plant.

[0026] Hydraulic energy storage system: Utilizing the natural elevation difference of the plant area or constructing pressure vessels to form a liftable water storage facility, and equipped with reversible water pumps / turbines.

[0027] Process water distribution network: Transports recycled water to water points such as cooling, rinsing, and landscaping.

[0028] Collaborative control system: Based on influent load forecast, electricity price signal and water level status, optimize micro-water treatment capacity, energy charging and discharging strategy of hydraulic energy storage system and scheduling of process water pumps.

[0029] The following is a detailed explanation of the connections between the various parts of the system: First, the wastewater treatment plant's water-energy synergistic control system, embedding micro-water circulation and hydraulic energy storage, includes the main treatment line of the wastewater treatment plant (such as screens, grit chambers, and biological treatment tanks) and a micro-water circulation treatment unit. The supernatant from the secondary sedimentation tank in the main treatment line serves as a low-pollution water source. One end of the micro-water circulation treatment unit is connected to the secondary sedimentation tank of the main treatment line and enters the micro-water circulation treatment unit through a pipeline. In this embodiment, the micro-water circulation treatment unit includes a constructed wetland and a low-pressure membrane filter assembly or a combination thereof connected in sequence, used for short-range deep treatment of low-pollution water to produce reclaimed water that meets specific in-plant reuse standards. Specifically, the micro-water circulation treatment unit purifies the low-pollution water source flowing out of the secondary sedimentation tank pipeline to remove residual suspended solids, organic matter, and some nutrients, producing reclaimed water with a turbidity of <1 NTU that meets the cooling water standards in the "Water Quality Standard for Industrial Water Reuse of Urban Wastewater" (GB / T19923-2005). The purified reclaimed water flows into the reclaimed water storage tank of the micro water circulation treatment unit or is directly connected to the process water distribution network.

[0030] Secondly, the wastewater treatment plant water energy coordinated control system embedded with micro water circulation and hydraulic energy storage also includes a hydraulic energy storage system, which includes an elevated water tank, a low-level water storage facility, a reversible water pump turbine, and a variable frequency booster pump.

[0031] The elevated water tank serves as a high-level water storage facility. This facility utilizes the natural elevation differences within the plant area and may be a pressure vessel or water tank independently installed at a high location (such as a rooftop or support structure). The inlet and outlet of the elevated water storage facility are connected to the process water distribution network to provide reclaimed water with potential energy. As an example, the elevated water tank is approximately 15 meters above the ground. The elevated water tank, along with the existing contact disinfection tank (or other water tanks within the plant), serves as a low-level water storage facility within the hydraulic energy storage system. This low-level water storage facility is connected to the reclaimed water storage tank of the micro-water circulation treatment unit via pipelines, from which reclaimed water can be drawn.

[0032] The reversible pump-turbine can operate bidirectionally between pump mode (power-consuming water pumping) and turbine mode (power generation or load driving). The reversible pump-turbine is installed on the connecting pipeline between the elevated water tank and the low-level water storage facility. The motor of the reversible pump-turbine is connected to the power grid of the wastewater treatment plant via a frequency converter and a bidirectional switch. The outlet pipeline of the elevated water tank is connected to the main pipeline of the process water distribution network.

[0033] The integrated water-energy control system for wastewater treatment plants, incorporating micro-water circulation and hydraulic energy storage, also includes a process water distribution network. This network comprises a main pipeline and multiple branch pipelines. The main pipeline connects to the elevated water tank and variable frequency booster pump of the hydraulic energy storage system. Each branch pipeline is equipped with a control valve, and multiple branch pipelines correspond to multiple water usage points. Each branch pipeline leads to its respective water usage point, such as equipment cooling water points, filter backwashing water points, landscaping water points, and reagent preparation system water points. For water usage points requiring pressurization, the process water distribution network is also connected in parallel with the variable frequency booster pump of the hydraulic energy storage system. The inlet of the variable frequency booster pump is connected to the reclaimed water storage tank.

[0034] The wastewater treatment plant water energy coordinated control system with embedded micro water circulation and hydraulic energy storage also includes a coordinated control system, which is the control core of the entire system and includes a coordinated controller, memory, and an industrial control computer or PLC control system with input / output interfaces.

[0035] The collaborative control system is composed of the following components: Hardware components: Main control unit: Industrial-grade PLC or embedded industrial computer, supporting IEC61131-3 programming standard; Communication module: Supports multiple protocols such as Modbus TCP / IP, OPCUA, and IEC61850 for real-time communication with the plant's DCS system, power grid dispatching system 15, and electricity price signal receiving module; Data storage module: solid-state storage array, supporting local caching of historical data, sampling frequency ≥1Hz, storage period ≥1 year; Human-machine interface: touch screen or host computer, displaying system status, optimization results and alarm information in real time; Software components: Forecasting module: includes inflow load forecasting (based on LSTM neural network, inputting historical inflow flow, water quality, and meteorological data) and electricity price forecasting (based on time-of-use electricity price curves or real-time market signals). Optimization solver: Based on mixed-integer linear programming or quadratic programming algorithms, it embeds explicit control laws for multi-parameter programming to achieve millisecond-level online optimization; State estimation module: Based on extended Kalman filter, it integrates data from multiple sources such as water level sensor 16, water quality sensor 17, and power meter to estimate unmeasurable states (such as pipeline head loss and equipment wear coefficient) in real time. Visualization module: Based on digital twin technology, a three-dimensional visualization model of the entire system is constructed to display water flow, energy flow and information flow in real time.

[0036] The input control line of the collaborative controller is used to receive predicted data of sewage treatment volume for multiple future control cycles from the influent load prediction server, predicted electricity prices for multiple future control cycles from the power grid system, current water level status of high-level water tanks and low-level water storage facilities from water level sensors, instantaneous flow rate of each water point, and current reclaimed water quality from water quality sensors. The output control line of the collaborative controller is connected to the influent pump of the micro-water circulation treatment unit to control the start and stop of the micro-water circulation treatment unit and the sewage treatment volume. The reversible pump turbine is used to control the switching of operating conditions and control the power. The variable frequency booster pump and the control valves of each water point are used to control the pump speed and control the valve opening. In addition, the collaborative controller has an internal optimization algorithm to dynamically generate and execute optimized scheduling strategies based on the input data.

[0037] The functions of each part of the system are described in detail below: The collaborative control system is used to generate a scheduling strategy for the multiple future control cycles based on the predicted wastewater treatment volume, predicted electricity price for the multiple future control cycles, current water level status of the high-level water tank and low-level water storage facilities, current reclaimed water quality, and instantaneous flow rate of each water point, with the goal of minimizing total electricity cost. The scheduling strategy is used to control the start-up and shutdown and treatment volume of the micro water circulation unit, control the operating conditions of the reversible water pump turbine, control the start-up and shutdown and speed of the variable frequency booster pump, and control the opening and closing of valves at multiple water points.

[0038] In this embodiment, the collaborative controller in the collaborative control system receives the current water level status of the high-level water tank and low-level water storage facility, the current water quality of the reclaimed water, the instantaneous flow rate of each water usage point, and the predicted wastewater treatment volume and electricity price for multiple future control cycles. Based on this data, it uses an internally embedded optimization algorithm to generate a scheduling strategy for each future control cycle, aiming to minimize the total electricity cost within multiple future control cycles. Then, when a future control cycle arrives, the corresponding scheduling strategy is adopted, thereby comprehensively considering the influent load (affecting the micro-water circulation treatment volume), electricity price signals, and water level status, and making real-time decisions on the water production of the micro-water circulation unit, the timing and power of the charging and discharging of the hydraulic energy storage system, and the source of process water (gravity flow / pump pressurization), to achieve coordinated regulation of water and energy.

[0039] The micro-water circulation treatment unit is used to treat polluted water to obtain reclaimed water by using electricity provided by the power grid, according to the polluted water treatment volume in the scheduling strategy.

[0040] In this embodiment, the micro-water circulation treatment unit uses electricity provided by the power grid to treat polluted water of a corresponding size according to the polluted water treatment volume in the scheduling strategy to obtain reclaimed water. The electricity provided by the power grid includes at least the electricity of the power grid itself and the electricity generated by the hydroelectric energy storage system releasing reclaimed water from the high-level water tank to generate electricity, which is then incorporated into the power grid.

[0041] A hydroelectric energy storage system is used to pump reclaimed water from the low-level water storage facility to the high-level water tank when the scheduling strategy includes energy storage operation; to release the reclaimed water in the high-level water tank to generate electricity and then feed the generated electricity into the power grid when the scheduling strategy includes energy release operation; and to use the water in the high-level water tank to supply water to water points with process water demand by gravity flow when the scheduling strategy includes a first process water collaborative allocation operation. The first process water collaborative allocation operation means that process water collaborative allocation is carried out when there is process water demand and the water level in the high-level water tank meets the gravity water supply conditions.

[0042] In this embodiment, the hydroelectric energy storage system can respond to different scheduling strategies issued by the coordinated scheduling system. Specifically, in this embodiment, at least the following scheduling strategies are included: (1) When the scheduling strategy includes energy storage operation, the reversible water pump turbine is started in pump mode according to the pumping power specified in the scheduling strategy (such as during the low electricity price period (such as at night) or the peak period of photovoltaic power generation in the plant and when the water in the high-level water tank is not full) to pump the regenerated water (or raw water) in the low-level water storage facility to the high-level water tank, thereby converting electrical energy into the potential energy of water for storage.

[0043] (2) When the dispatch strategy includes energy release operation, according to the discharge timing in the dispatch strategy (such as the peak electricity price period or when the power grid supply capacity of the sewage treatment plant is insufficient and peak shaving and valley filling are required to provide additional power, i.e. there is a power grid dispatch demand response situation), the reversible water pump turbine is started in the water turbine mode according to the power generation power specified in the dispatch strategy, thereby releasing the reclaimed water stored in the high-level water tank, driving the water turbine to rotate, driving the generator to generate electricity and then connecting the generated electricity to the power grid, or directly using the mechanical energy generated by the rotation of the water turbine to drive the micro water circulation treatment unit such as blower, lift pump and other equipment.

[0044] (3) When the scheduling strategy includes the first process water collaborative allocation operation, according to the water release timing in the scheduling strategy (such as when the water level of the reclaimed water in the high-level water tank meets the gravity water supply conditions), the water in the high-level water tank is used to supply water to the water point with process water demand by gravity flow. The first process water collaborative allocation operation means that process water collaborative allocation is carried out when there is process water demand and the water level of the high-level water tank meets the gravity water supply conditions.

[0045] In this embodiment, a bivariate energy storage model of "head-volume" is also constructed, incorporating the water quality parameters of reclaimed water into the generation of the scheduling efficiency of the hydraulic energy storage system.

[0046] Where C represents the water quality parameters of the reclaimed water (such as turbidity and pH value), ρ represents the density of the reclaimed water, g represents the gravitational acceleration, Q(t) represents the flow rate of the reclaimed water obtained by the micro-water circulation treatment unit, and H(t) represents the height of the reclaimed water pumped by the reversible pump-turbine. Water quality parameters affect the efficiency η of the reversible pump-turbine, thus affecting the actual release of energy. The collaborative control system monitors the water quality of the reclaimed water in real time through water quality sensors and then dynamically corrects the efficiency η of the reversible pump-turbine in the hydraulic energy storage system. This improves the scheduling efficiency of the hydraulic energy storage system when the water quality is good, and reduces it when the water quality is poor—a feature not found in existing pumped storage technologies.

[0047] Through the technical solutions of the above embodiments, reclaimed water can be used simultaneously as a "process medium" for supplying water to various water use points and as an "energy storage medium" for hydraulic energy storage systems, achieving spatiotemporal coupling of dual identities. This solves the problem in the prior art where the utilization of reclaimed water by sewage treatment plants is limited to traditional reuse scenarios (such as cooling, greening, flushing, etc.) and is disconnected from distributed pumped storage power stations.

[0048] Specifically, the spatiotemporal coupling of the reclaimed water in this application is manifested in the following two aspects: Time-dimensional coupling: The production, storage, and use of reclaimed water share the same timeline as the storage and release of electricity. The collaborative control system can dynamically adjust the flow of reclaimed water based on predicted electricity prices. For example, when electricity prices are low, reclaimed water is preferentially sent to an elevated water tank for energy storage; when electricity prices are high, the reclaimed water in the elevated water tank is then used for process water or power generation.

[0049] Spatial dimensional coupling: The elevated water tank serves as both an energy storage facility and a potential energy source for process water. Its inlet / outlet is directly connected to the process water distribution network, realizing the physical integration of energy storage facilities and water supply facilities.

[0050] In conjunction with the technical solutions of the above embodiments, an embodiment of this application also provides another wastewater treatment plant water energy coordinated control system embedded with micro water circulation and hydraulic energy storage. In this system, the coordinated control system is also used to determine whether there is a response signal for power grid dispatch demand, and if there is a response signal for power grid dispatch demand, to determine the power grid dispatch demand response time period. The hydroelectric energy storage system is also used to pump reclaimed water from the low-level water storage facility to the high-level water tank before the power grid dispatch demand response period. The hydroelectric energy storage system is also used to generate electricity through the reversible pump-turbine in a manner that allows for continuous power regulation during the grid dispatch demand response period. The collaborative control system is also used to generate a new scheduling strategy after the power grid dispatch demand response period, based on the predicted electricity price and the predicted wastewater treatment volume for multiple future control periods after the power grid dispatch demand response period. The hydroelectric energy storage system is used to pump reclaimed water from the low-level water storage facility to the high-level water tank when the new scheduling strategy includes energy storage operation.

[0051] In the existing technology, wastewater treatment plants participate in power grid dispatch demand response mainly through two methods: (1) directly shutting down high-energy-consuming equipment such as aerators and booster pumps; and (2) connecting to a virtual power plant platform to accept unified dispatch. Both of these methods have a fundamental contradiction between "process safety" and "response flexibility"—process constraints limit the depth of load regulation and response speed.

[0052] Furthermore, existing research indicates that short-term shutdowns of wastewater treatment plant aeration systems and influent pumps do not affect effluent quality within a certain range. However, transforming this "adjustable potential" into dispatchable "virtual energy storage resources" remains a technical challenge. Recent research has proposed a framework for converting hydraulic retention time constraints into virtual energy storage resources, but it has not yet been integrated with distributed physical energy storage.

[0053] Based on this, in this embodiment, before generating the scheduling strategy, the collaborative control system inputs data including predicted wastewater treatment volume for multiple future control cycles, predicted electricity prices for multiple future control cycles, current water level status of high-level water tanks and low-level water storage facilities, current reclaimed water quality, and instantaneous flow rate at each water usage point. In addition, it needs to determine whether the system includes response signals for grid scheduling requests from the wastewater treatment plant's power grid. If a response signal for grid scheduling requests is found, the system further determines the grid scheduling request response time period. Here, grid scheduling requests indicate that the power grid needs to reduce electricity consumption during the grid scheduling request response time period. Therefore, the system needs to store energy in advance to generate electricity during the grid scheduling request response time period.

[0054] Therefore, the dispatching strategy also includes: before the grid dispatching demand response period arrives, using the pumping power in the dispatching strategy, starting the reversible pump-turbine in pump mode to pump reclaimed water from the low-level water storage facility to the high-level water tank for energy storage; and during the grid dispatching demand response period, using the power generation power in the dispatching strategy, starting the reversible pump-turbine in turbine mode, and making the turbine generate electricity in a continuous power regulation manner (i.e., the power generation power gradually increases from 0 to the target power generation power, and then gradually decreases to 0, ensuring that the load change in the grid is a ramp-like, not a cliff-like, process), to achieve flexible load ramping and avoid the impact of step changes on the grid. Following the grid dispatch demand response period, predicted electricity prices and wastewater treatment volumes for multiple future control cycles are acquired. Combined with current data, a new dispatch strategy is generated. Under this new strategy, which includes energy storage operation, the hydroelectric energy storage system, during periods of low electricity prices, controls the reversible pump-turbine to operate in pump mode, pumping reclaimed water from low-level storage facilities to high-level tanks for energy storage. This approach not only addresses the pain points of traditional grid dispatch demand response—"response is disturbance, recovery is shock"—but also reduces electricity costs through load regulation in response to grid dispatch demands and generates revenue through participation in grid dispatch, ultimately achieving the goal of minimizing total electricity costs.

[0055] The proposed dual-layer flexible architecture of "physical energy storage + virtual energy storage" in this application is as follows: The first layer (physical energy storage layer): The hydroelectric energy storage system acts as a physical buffer, undertaking the main load regulation tasks. When the grid dispatch demand response signal is triggered, it responds first by adjusting the operating conditions of the reversible pump turbine, without causing any disturbance to the main process flow.

[0056] The second layer (virtual energy storage layer): When the physical energy storage capacity of the high-level water tank of the hydraulic energy storage system is insufficient or requires deep adjustment, the collaborative control system, through optimization algorithms, appropriately adjusts the water production of the micro water circulation treatment unit (reducing the amount of polluted water treated) and the water supply load of the process water distribution network (or distributes reclaimed water to each water point) under the premise of ensuring process safety.

[0057] This two-layer architecture achieves an optimal balance between responsiveness and process safety, with a response depth of 15%-25% of the total power load of the wastewater treatment plant, far exceeding the 5%-10% achieved by relying solely on process regulation. This enables dual flexibility in load regulation of water treatment and response to grid dispatch demands. Furthermore, by optimizing the timing of micro-water treatment and energy storage dispatch, it not only smooths the power consumption curve of the plant's grid but also provides low-cost peak-shaving auxiliary services for the grid.

[0058] In conjunction with the technical solutions of the above embodiments, one embodiment of this application also provides another wastewater treatment plant water energy coordinated control system embedding micro-water circulation and hydraulic energy storage. In this system, the hydraulic energy storage system is further used for: When the scheduling strategy includes a second process water coordinated allocation operation, the gravity flow valve of the high-level water tank is closed, and the reclaimed water in the reclaimed water storage tank is drawn by the variable frequency booster pump to supply water to the water points with process water demand. The second process water collaborative allocation operation refers to the collaborative allocation of process water when there is a demand for process water and the water level of the elevated water tank does not meet the gravity water supply conditions.

[0059] Specifically, in this embodiment, if the scheduling strategy also includes a second process water collaborative allocation operation, it means that process water collaborative allocation needs to be carried out when there is a demand for process water and the water level in the high-level water tank does not meet the gravity water supply conditions. At this time, since the water level in the high-level water tank does not meet the gravity water supply conditions (such as the water level being too low to provide water with the corresponding pressure, or the need for pumped water storage, etc.), the reclaimed water in the high-level water tank cannot be used directly for process water. Therefore, the scheduling command of the collaborative controller will instruct to close the gravity flow valve of the high-level water tank to avoid using the reclaimed water in the high-level water tank. Then, the reclaimed water in the reclaimed water storage tank is directly pumped by the variable frequency pressurized water pump and pressurized to supply water to the water point with process water demand, thereby simultaneously meeting the energy storage demand of the hydraulic energy storage system and the process water demand of each water point.

[0060] In conjunction with the technical solutions of the above embodiments, one embodiment of this application also provides another wastewater treatment plant water energy coordinated control system embedding micro-water circulation and hydraulic energy storage. In this system, the hydraulic energy storage system is further used for: When the scheduling strategy includes the third process water collaborative allocation operation, during the energy storage operation of the hydraulic energy storage system, the reclaimed water in the high-level water tank or the reclaimed water in the reclaimed water storage tank is simultaneously used to supply water to the water points with process water demand by using the reclaimed water in the high-level water tank or by using the variable frequency booster water pump. The third process water collaborative allocation operation refers to the water point that has process water demand and that requires instantaneous flow rate for filter backwashing.

[0061] Specifically, in this embodiment, if the scheduling strategy also includes a third process water collaborative allocation operation, it means that the filter backwashing water point needs to be in a situation where there is a process water demand and the water point with the process water demand is a point that requires instantaneous flow.

[0062] Therefore, the coordinated control system will use scheduling strategies to instruct the hydroelectric energy storage system to release reclaimed water from the high-level water tank or use variable frequency booster pumps to extract reclaimed water from the reclaimed water storage tank during the energy storage operation, based on the operating conditions of the hydroelectric energy storage system, to supply water to water points with process water demand. For example, during the energy storage process of the hydroelectric energy storage system during the low electricity price period, the backwash valve of the water point can be opened at the same time, and the excess head of the reversible pump turbine can be used for pumping backwashing, thereby smoothing the grid load.

[0063] It should be noted that after each future control cycle is completed, the current data of the system will be updated, and then the next future control cycle will begin.

[0064] In conjunction with the technical solutions of the above embodiments, one embodiment of this application also provides another wastewater treatment plant water-energy coordinated control system embedding micro-water circulation and hydraulic energy storage. In this system, the micro-water circulation treatment unit is connected to the secondary sedimentation tank of the main treatment line of the wastewater treatment plant. The micro-water circulation treatment unit also includes an artificial wetland and a low-pressure membrane filtration component. The low-pressure membrane filtration component is used to generate primary reclaimed water, the artificial wetland is used to generate secondary reclaimed water, and the secondary sedimentation tank is used to generate tertiary reclaimed water. The hydraulic energy storage system is also used to supply water to water points with process water demand by gravity flow through primary and / or secondary reclaimed water in the high-level water tank when the scheduling strategy is a first process water collaborative allocation operation. The hydraulic energy storage system is also used to, when the scheduling strategy is a second process water coordinated allocation operation, close the gravity flow valve of the high-level water tank and start the variable frequency booster pump to draw the secondary reclaimed water from the reclaimed water storage tank to supply water to the water points with process water demand. The hydraulic energy storage system is also used to, when the scheduling strategy is energy storage operation, switch the reversible pump turbine to pump operation during periods of low electricity prices, and pump the tertiary reclaimed water in the low-level water storage facility to the high-level water tank.

[0065] Specifically, in this embodiment, a water quality-based energy cascade utilization strategy is proposed, as shown in Table 2: Table 2: Energy Cascade Utilization Strategies Based on Water Quality

[0066] Referring to Table 2, for water storage facilities such as elevated water tanks or reclaimed water storage ponds, different water storage areas and pipelines can be set up for reclaimed water of different water quality levels to facilitate different uses. This tiered utilization strategy enables reclaimed water of different water quality to play its maximum value and achieve resource allocation optimization of "high-quality water for high-quality use and low-quality water for energy storage".

[0067] In conjunction with the technical solutions of the above embodiments, one embodiment of this application also provides another wastewater treatment plant water energy coordinated control system embedding micro-water circulation and hydraulic energy storage. In this system, the coordinated control system is further used for: A target function is set for the stated objective, and the target function is:

[0068] in, p ( k () represents the predicted electricity price for the k-th future control period. This represents the amount of electricity purchased from the grid, and Δt represents the duration of a future control cycle. This refers to the benefits gained through load regulation to reduce electricity costs and participation in grid dispatch. Constraints are set for the target, including: water level safety constraints, power grid dispatch demand response constraints, process safety constraints, equipment operation constraints, and water balance constraints.

[0069] Specifically, in this embodiment, as an example, the core workflow of the collaborative control system is a four-step rolling optimization algorithm, which is executed once every control cycle (e.g., 15 minutes is a future control cycle, T is 96). The collected data includes: Current water level L(t), water quality C(t), instantaneous flow rate Q_demand(t) at each water usage point; 24-hour inflow forecast sequence ; Electricity price forecast series for the next 24 hours ; Power grid dispatch demand response signal.

[0070] Construct an optimization problem with the objective of minimizing the total electricity cost over the next 24 hours: Objective function: ; The constraints are as follows: ; Where L(k) represents the water level of the high-level water tank in the k-th future control cycle, and L(k+1) represents the water level of the high-level water tank in the (k+1)-th future control cycle. This represents the water flow rate that will be drawn back from the high-level water tank in the k-th future control cycle. This represents the water flow rate released from the high-level water tank in the k-th future control cycle. Let A represent the water flow rate of gravity-fed water supply in the k-th future control cycle, and let A represent the bottom area of ​​the elevated water tank. The water level of the elevated water tank in each future scheduling cycle can be determined through the dynamic equation of the hydraulic energy storage system.

[0071] This represents the flow rate of reclaimed water produced by the micro-water circulation treatment unit in the k-th future control cycle. This represents the flow rate of reclaimed water required for energy storage in the high-level water tank during the k-th future control cycle.

[0072] The water balance constraint means that the sum of the reclaimed water flow required for energy storage in the high-level water tank and the water flow required at each water point in each future control cycle must be greater than or equal to the sum of the reclaimed water flow generated by the micro water circulation treatment unit, the gravity flow water supply, and the water flow pumped back from the low-level water storage facility to the high-level water tank.

[0073] This represents the pumping power of the water pump in the k-th future control cycle. This indicates the maximum allowable pumping power of the water pump. This represents the power generation capacity of the turbine in the k-th future control cycle. This indicates the maximum allowable power generation of the turbine. Therefore, the equipment operation constraint means that the operating power of both the pump and the turbine cannot exceed their maximum operating power.

[0074] Water level safety constraints mean that the water level L(k) cannot be lower than It cannot be higher than .

[0075] This represents the electrical power that the system obtains from the grid in the k-th future control cycle. This represents the baseline electrical power that the system plans to use in the k-th future control cycle. This represents the electrical power that the system needs to respond to grid dispatching demands in the k-th future control cycle (e.g., the grid requires a reduction of 500 kWh of electrical power). Therefore, the demand response constraint means that the electrical power obtained from the grid must be less than the sum of the baseline electrical power and the electrical power required to respond to grid dispatching demands.

[0076] This indicates the minimum water flow rate that the micro-water circulation treatment unit can process. This represents the flow rate of reclaimed water generated by the micro-water circulation treatment unit in the k-th future control cycle. This indicates the maximum water flow rate that the micro-water circulation treatment unit can process. The maximum flow rate of gravity flow depends on the current water level in the high-level water tank. When the water level is high, the pressure is high and the flow is fast. When the water level is low, the flow is slow. Therefore, the process safety constraint means that the micro water circulation treatment unit cannot exceed the limit and the water flow rate of gravity flow supply depends on the current water level.

[0077] The optimal control sequence is obtained by solving the above objective using a mixed-integer linear programming solver. And extract the scheduling strategy for each future control cycle. If a system receives a grid dispatch demand response signal during the execution of a dispatch strategy, it will regenerate the subsequent dispatch strategy. This rolling optimization mechanism enables the collaborative control system to respond in real time to electricity price fluctuations, changes in water inflow load, and grid dispatch instructions, thereby achieving dynamic collaborative optimization of water treatment and energy dispatch.

[0078] Through the technical solutions of the various embodiments of this application, a new technical paradigm of "water-energy synergy" can be constructed by deeply integrating the micro water circulation treatment unit, the distributed hydroelectric energy storage system, and the process water distribution network. The core innovation of this application is reflected in: 1. Innovative Architecture: It pioneered an integrated architecture of "water treatment-energy storage-process water", in which reclaimed water serves as both a process medium and an energy storage medium, realizing the physical integration of water treatment and energy conversion processes.

[0079] 2. Control Innovation: The collaborative control system based on hierarchical distributed model predictive control achieves dual flexibility in load regulation of water treatment and demand response of power grid dispatch, with response depth and flexibility significantly superior to existing technologies.

[0080] 3. Innovative Benefits: Construct a coupled benefit model of "water saving equals energy saving", and achieve the superimposed effect of water saving and energy saving through tiered utilization and collaborative optimization of water quality, resulting in a win-win situation for both economic and environmental benefits.

[0081] These innovations together constitute the essential technical features of this invention, distinguishing it from existing wastewater treatment plant reclaimed water utilization and energy storage technologies, and giving it significant advancement and inventiveness.

[0082] Figure 2 This is a schematic flowchart of a wastewater treatment plant water energy synergistic control method that embeds micro water circulation and hydraulic energy storage, provided in an embodiment of this application.

[0083] refer to Figure 2 This application provides a method for coordinated regulation of water energy in wastewater treatment plants by embedding micro-water circulation and hydraulic energy storage, the method comprising steps S11 to S13: Step S11: Through the collaborative control system, based on the predicted sewage treatment volume for multiple future control cycles, the predicted electricity price for multiple future control cycles, the current water level status of the high-level water tank and the low-level water storage facility, the current water quality of the reclaimed water, and the instantaneous flow rate of each water point, a scheduling strategy is generated for the multiple future control cycles with the goal of minimizing the total electricity cost. The scheduling strategy is used to control the start-up and shutdown and treatment volume of the micro water circulation unit, control the operating conditions of the reversible water pump turbine, control the start-up and shutdown and speed of the variable frequency booster pump, and control the opening and closing of valves at multiple water points. Step S12: Through the micro-water circulation treatment unit, according to the polluted water treatment volume in the scheduling strategy, the polluted water is treated with electricity provided by the power grid to obtain reclaimed water according to the polluted water treatment volume. Step S13: Using a hydroelectric energy storage system, when the scheduling strategy includes energy storage operation, reclaimed water from the low-level water storage facility is pumped to the high-level water tank; when the scheduling strategy includes energy release operation, the reclaimed water in the high-level water tank is released to generate electricity, which is then fed into the power grid; when the scheduling strategy includes a first process water collaborative allocation operation, the water in the high-level water tank is used to supply water to water points with process water demand by gravity flow; the first process water collaborative allocation operation means that process water collaborative allocation is carried out when there is process water demand and the water level in the high-level water tank meets the gravity water supply conditions.

[0084] Optionally, the method further includes: Step S21: Determine whether there is a response signal for power grid dispatching demand through the collaborative control system, and determine the response time period for power grid dispatching demand if there is a response signal for power grid dispatching demand. Step S22: Before the power grid dispatch demand response time period, the reclaimed water in the low-level water storage facility is pumped to the high-level water tank through the hydroelectric energy storage system. Step S22: During the grid dispatch demand response period, the reversible pump-turbine generates electricity through the hydroelectric energy storage system in a manner of continuous power regulation. Step S23: Through the collaborative control system, after the power grid dispatch demand response time period, a new dispatch strategy is generated based on the predicted electricity price and the predicted wastewater treatment volume for multiple future control cycles after the power grid dispatch demand response time period. Step S24: Using a hydroelectric energy storage system, when the new scheduling strategy includes energy storage operation, the reclaimed water in the low-level water storage facility is pumped to the high-level water tank.

[0085] Optionally, the method further includes: Step S31: Using the hydraulic energy storage system, when the scheduling strategy includes the second process water coordinated allocation operation, the gravity flow valve of the high-level water tank is closed, and the reclaimed water in the reclaimed water storage tank is pumped by the variable frequency booster pump to supply water to the water points with process water demand. The second process water collaborative allocation operation refers to the collaborative allocation of process water when there is a demand for process water and the water level of the elevated water tank does not meet the gravity water supply conditions.

[0086] Optionally, the method further includes: Step S41: In the case that the scheduling strategy includes the third process water collaborative allocation operation, the hydraulic energy storage system simultaneously uses reclaimed water from the high-level water tank or uses a variable frequency booster pump to extract reclaimed water from the reclaimed water storage tank to supply water to the water points with process water demand during the energy storage operation of the hydraulic energy storage system. The third process water collaborative allocation operation refers to the water point that has process water demand and that requires instantaneous flow rate for filter backwashing.

[0087] Optionally, the method further includes: Step S51: Using a hydraulic energy storage system, under the condition that the scheduling strategy is the first process water coordinated allocation operation, gravity flow water is supplied to the water points with process water demand through the primary and / or secondary reclaimed water in the high-level water tank. Step S52: Using the hydraulic energy storage system, under the scheduling strategy of second process water coordinated allocation operation, close the gravity flow valve of the high-level water tank and start the variable frequency booster pump to draw secondary reclaimed water from the reclaimed water storage tank to supply water to the water points with process water demand. Step S53: Using the hydroelectric energy storage system, under the dispatch strategy of energy storage operation, during periods of low electricity prices, the reversible pump turbine is switched to pump operation mode, and the tertiary reclaimed water in the low-level water storage facility is pumped to the high-level water tank.

[0088] Optionally, the method further includes: Step S61: Through the collaborative control system, a target function is set for the target, and the target function is:

[0089] in, p ( k () represents the predicted electricity price for the k-th future control period. This represents the amount of electricity purchased from the grid, and Δt represents the duration of a future control cycle. This refers to the benefits gained through load regulation to reduce electricity costs and participation in grid dispatch. Step S62: Through the collaborative control system, set constraints for the target, including: water level safety constraints, power grid dispatch demand response constraints, process safety constraints, equipment operation constraints, and water balance constraints.

[0090] It should be noted that the wastewater treatment plant water energy coordinated control method with embedded micro-water circulation and hydraulic energy storage provided in this application embodiment can be executed by a wastewater treatment plant water energy coordinated control device with embedded micro-water circulation and hydraulic energy storage, or by the control module in the wastewater treatment plant water energy coordinated control device with embedded micro-water circulation and hydraulic energy storage for executing the wastewater treatment plant water energy coordinated control method with embedded micro-water circulation and hydraulic energy storage. This application embodiment uses the execution of the wastewater treatment plant water energy coordinated control method with embedded micro-water circulation and hydraulic energy storage by the wastewater treatment plant water energy coordinated control device with embedded micro-water circulation and hydraulic energy storage as an example to illustrate the wastewater treatment plant water energy coordinated control method with embedded micro-water circulation and hydraulic energy storage provided in this application embodiment.

[0091] Figure 3 This is a schematic diagram of the framework of a wastewater treatment plant water energy coordinated control device embedded with micro-water circulation and hydraulic energy storage, provided in one embodiment of this application. (Refer to...) Figure 3 .

[0092] One embodiment of this application provides a wastewater treatment plant water energy coordinated control device embedding micro-water circulation and hydraulic energy storage, the device comprising: The first scheduling strategy generation module 11, configured in the collaborative control system, is used to generate a scheduling strategy for the multiple future control cycles based on the predicted sewage treatment volume for multiple future control cycles, the predicted electricity price for multiple future control cycles, the current water level status of the high-level water tank and the low-level water storage facility, the current water quality of the reclaimed water, and the instantaneous flow rate of each water point, with the goal of minimizing the total electricity cost. The scheduling strategy is used to control the start-up and shutdown and treatment volume of the micro water circulation unit, control the operating conditions of the reversible water pump turbine, control the start-up and shutdown and speed of the variable frequency booster pump, and control the opening and closing of valves at multiple water points. Water treatment module 12, configured in the micro water circulation treatment unit, is used to treat polluted water to obtain reclaimed water by using electricity provided by the power grid according to the polluted water treatment volume in the scheduling strategy. The first scheduling module 13, configured in the hydroelectric energy storage system, is used to pump reclaimed water from the low-level water storage facility to the high-level water tank when the scheduling strategy includes energy storage operation; when the scheduling strategy includes energy release operation, release the reclaimed water in the high-level water tank to generate electricity and then connect the generated electricity to the power grid; when the scheduling strategy includes a first process water collaborative allocation operation, use the water in the high-level water tank to supply water to water points with process water demand by gravity flow; the first process water collaborative allocation operation means that process water collaborative allocation is performed when there is process water demand and the water level in the high-level water tank meets the gravity water supply conditions.

[0093] Optionally, the device further includes: The judgment module, configured in the collaborative control system, is used to determine whether there is a response signal for power grid dispatching demand, and if there is a response signal for power grid dispatching demand, to determine the response time period for power grid dispatching demand. The first pumping module, configured in the hydroelectric energy storage system, is used to pump reclaimed water from the low-level water storage facility to the high-level water tank before the power grid dispatch demand response period. The power generation module, configured in the hydroelectric energy storage system, is used to generate electricity through the reversible pump-turbine in a manner that adjusts the power output continuously during the grid dispatch demand response period. The second scheduling strategy generation module is configured in the collaborative control system and is used to generate a new scheduling strategy after the power grid scheduling demand response time period, based on the predicted electricity price and the predicted sewage treatment volume for multiple future control periods after the power grid scheduling demand response time period. The second pumping module, configured in the hydroelectric energy storage system, is used to pump reclaimed water from the low-level water storage facility to the high-level water tank when the new scheduling strategy includes energy storage operation.

[0094] Optionally, the device further includes: The second scheduling module, configured in the hydraulic energy storage system, is used to close the gravity flow valve of the high-level water tank and supply water to the water points with process water demand by drawing reclaimed water from the reclaimed water storage tank through the variable frequency booster pump when the scheduling strategy includes the second process water collaborative allocation operation. The second process water collaborative allocation operation refers to the collaborative allocation of process water when there is a demand for process water and the water level of the elevated water tank does not meet the gravity water supply conditions.

[0095] Optionally, the device further includes: The third scheduling module, configured in the hydraulic energy storage system, is used to supply water to water points with process water demand by using reclaimed water in the high-level water tank or by using a variable frequency booster pump to extract reclaimed water from the reclaimed water storage tank during the energy storage operation of the hydraulic energy storage system when the scheduling strategy includes the third process water collaborative allocation operation. The third process water collaborative allocation operation refers to the water point that has process water demand and that requires instantaneous flow rate for filter backwashing.

[0096] Optionally, the device further includes: The fourth scheduling module, configured in the hydroelectric energy storage system, is used to supply water to water points with process water demand by gravity flow through the primary and / or secondary reclaimed water in the high-level water tank when the scheduling strategy is the first process water collaborative allocation operation. The fifth scheduling module, configured in the hydraulic energy storage system, is used to close the gravity flow valve of the high-level water tank and start the variable frequency booster pump to draw secondary reclaimed water from the reclaimed water storage tank to supply water to water points with process water demand when the scheduling strategy is the second process water coordinated allocation operation. The sixth scheduling module, configured in the hydroelectric energy storage system, is used to switch the reversible pump turbine to pump operation during periods of low electricity prices when the scheduling strategy is energy storage operation, and to pump the tertiary reclaimed water in the low-level water storage facility to the high-level water tank.

[0097] Optionally, the device further includes: The objective function setting module, configured in the cooperative control system, is used to set an objective function for the objective, wherein the objective function is:

[0098] in, p ( k () represents the predicted electricity price for the k-th future control period. This represents the amount of electricity purchased from the grid, and Δt represents the duration of a future control cycle. This refers to the benefits gained through load regulation to reduce electricity costs and participation in grid dispatch. The constraint setting module, configured in the collaborative control system, is used to set constraints for the target. The constraints include: water level safety constraints, power grid dispatch demand response constraints, process safety constraints, equipment operation constraints, and water balance constraints.

[0099] The wastewater treatment plant water energy coordinated control device with embedded micro-water circulation and hydraulic energy storage in this application embodiment can be a device, or it can be a component, integrated circuit, or chip in a terminal. The device can be a mobile electronic device or a non-mobile electronic device. For example, mobile electronic devices can be mobile phones, tablets, laptops, PDAs, in-vehicle electronic devices, wearable devices, ultra-mobile personal computers (UMPCs), netbooks, or personal digital assistants (PDAs), etc., while non-mobile electronic devices can be servers, network attached storage (NAS), personal computers (PCs), televisions (TVs), ATMs, or self-service machines, etc., and this application embodiment does not specifically limit the scope.

[0100] The wastewater treatment plant water energy coordinated control device with embedded micro-water circulation and hydraulic energy storage in this application embodiment can be a device with an operating system. This operating system can be Android, iOS, or other possible operating systems; this application embodiment does not specifically limit it.

[0101] The wastewater treatment plant water energy coordinated control device embedded with micro-water circulation and hydraulic energy storage provided in this application embodiment can achieve... Figure 2 The various processes of the wastewater treatment plant water energy synergistic regulation method that embeds micro water circulation and hydraulic energy storage in the method embodiment will not be described again here to avoid repetition.

[0102] Optionally, Figure 4 This is a schematic diagram of the hardware structure of an electronic device according to an embodiment of this application. This application also provides an electronic device; it should be noted that the electronic device in this application includes the mobile electronic device and non-mobile electronic device described above.

[0103] The electronic device includes, but is not limited to, components such as: radio frequency unit, network module, audio output unit, input unit, sensor, display unit, user input unit, interface unit, memory, and processor.

[0104] Those skilled in the art will understand that electronic devices may also include power supplies (such as batteries) that supply power to various components. The power supply may be connected to the processor logic through a power management system, thereby enabling functions such as managing charging, discharging, and power consumption through the power management system. Figure 4The electronic device structure shown does not constitute a limitation on the electronic device. The electronic device may include more or fewer components than shown, or combine certain components, or have different component arrangements, which will not be elaborated here. As an example, such as Figure 4 As shown, the electronic device 600 includes a memory 610 and a processor 620. The memory 610 and the processor 620 are connected via a bus for communication. The memory 610 stores a computer program that can run on the processor 620 to implement the steps in the wastewater treatment plant water energy synergistic control method with embedded micro water circulation and hydraulic energy storage disclosed in the above embodiments of this application.

[0105] As the apparatus is basically similar to the method embodiment, it is described in a relatively simple way. For relevant details, please refer to the description of the method embodiment.

[0106] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0107] Those skilled in the art will understand that embodiments of this application can be provided as methods, apparatus, or computer program products. Therefore, embodiments of this application can take the form of entirely hardware embodiments, entirely software embodiments, or embodiments combining software and hardware aspects.

[0108] Furthermore, this application embodiment also provides a readable storage medium storing a program or instructions. When the program or instructions are executed by a processor, they implement the various processes of the above-described embodiment of the wastewater treatment plant water energy coordinated control method embedding micro water circulation and hydraulic energy storage, and can achieve the same technical effect. To avoid repetition, they will not be described again here.

[0109] The processor is the processor in the electronic device described in the above embodiments. The readable storage medium includes computer-readable storage media, such as computer read-only memory (ROM), random access memory (RAM), magnetic disk, or optical disk.

[0110] This application embodiment also provides a chip, which includes a processor and a communication interface. The communication interface and the processor are coupled. The processor is used to run programs or instructions to implement the various processes of the above-described embodiment of the wastewater treatment plant water energy coordinated control method with embedded micro water circulation and hydraulic energy storage, and can achieve the same technical effect. To avoid repetition, it will not be described again here.

[0111] It should be understood that the chip mentioned in the embodiments of this application may also be referred to as a system-on-a-chip, system chip, chip system, or system-on-a-chip, etc.

[0112] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0113] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) and includes several instructions to cause a terminal (which may be a mobile phone, computer, server, air conditioner, or network device, etc.) to execute the methods described in the various embodiments of this application.

[0114] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A wastewater treatment plant water energy coordinated control system embedding micro-water circulation and hydraulic energy storage, characterized in that, The system includes: The collaborative control system is used to generate a scheduling strategy for the multiple future control cycles based on the predicted sewage treatment volume, predicted electricity price for the multiple future control cycles, current water level status of the high-level water tank and low-level water storage facilities, current reclaimed water quality, and instantaneous flow rate of each water point, with the goal of minimizing total electricity cost. The scheduling strategy is used to control the start-up and shutdown and treatment volume of the micro water circulation unit, control the operating conditions of the reversible water pump turbine, control the start-up and shutdown and speed of the variable frequency booster pump, and control the opening and closing of valves at multiple water points. The micro-water circulation treatment unit is used to treat polluted water to obtain reclaimed water by using electricity provided by the power grid according to the polluted water treatment volume in the scheduling strategy. A hydroelectric energy storage system is used to pump reclaimed water from the low-level water storage facility to the high-level water tank when the scheduling strategy includes energy storage operation; to release the reclaimed water in the high-level water tank to generate electricity and then feed the generated electricity into the power grid when the scheduling strategy includes energy release operation; and to use the water in the high-level water tank to supply water to water points with process water demand by gravity flow when the scheduling strategy includes a first process water collaborative allocation operation. The first process water collaborative allocation operation means that process water collaborative allocation is carried out when there is process water demand and the water level in the high-level water tank meets the gravity water supply conditions.

2. The wastewater treatment plant water energy coordinated control system with embedded micro-water circulation and hydraulic energy storage as described in claim 1, characterized in that, The collaborative control system is also used to determine whether there is a response signal for power grid dispatching demand, and if there is a response signal for power grid dispatching demand, to determine the response time period for power grid dispatching demand. The hydroelectric energy storage system is also used to pump reclaimed water from the low-level water storage facility to the high-level water tank before the power grid dispatch demand response period. The hydroelectric energy storage system is also used to generate electricity through the reversible pump-turbine in a manner of continuous power regulation during the grid dispatch demand response period. The collaborative control system is also used to generate a new scheduling strategy after the power grid dispatch demand response period, based on the predicted electricity price and the predicted wastewater treatment volume for multiple future control periods after the power grid dispatch demand response period. The hydraulic energy storage system is used to pump reclaimed water from the low-level water storage facility to the high-level water tank when the new scheduling strategy includes energy storage operation.

3. The wastewater treatment plant water-energy coordinated control system with embedded micro-water circulation and hydraulic energy storage as described in claim 1, characterized in that, The hydraulic energy storage system is also used for: When the scheduling strategy includes a second process water coordinated allocation operation, the gravity flow valve of the high-level water tank is closed, and the reclaimed water in the reclaimed water storage tank is drawn by the variable frequency booster pump to supply water to the water points with process water demand. The second process water collaborative allocation operation refers to the collaborative allocation of process water when there is a demand for process water and the water level of the elevated water tank does not meet the gravity water supply conditions.

4. The wastewater treatment plant water-energy coordinated control system with embedded micro-water circulation and hydraulic energy storage as described in claim 1, characterized in that, The hydraulic energy storage system is also used for: When the scheduling strategy includes the third process water collaborative allocation operation, during the energy storage operation of the hydraulic energy storage system, the reclaimed water in the high-level water tank or the reclaimed water in the reclaimed water storage tank is simultaneously used to supply water to the water points with process water demand by using the reclaimed water in the high-level water tank or by using the variable frequency booster water pump. The third process water collaborative allocation operation refers to the water point that has process water demand and that requires instantaneous flow rate for filter backwashing.

5. The wastewater treatment plant water-energy coordinated control system with embedded micro-water circulation and hydraulic energy storage as described in claim 3, characterized in that, The micro-water circulation treatment unit is connected to the secondary sedimentation tank of the main treatment line of the sewage treatment plant. The micro-water circulation treatment unit also includes an artificial wetland and a low-pressure membrane filtration assembly. The low-pressure membrane filtration assembly is used to generate primary reclaimed water, the artificial wetland is used to generate secondary reclaimed water, and the secondary sedimentation tank is used to generate tertiary reclaimed water. The hydraulic energy storage system is also used to supply water to water points with process water demand by gravity flow through primary and / or secondary reclaimed water in the high-level water tank when the scheduling strategy is a first process water collaborative allocation operation. The hydraulic energy storage system is also used to, when the scheduling strategy is a second process water coordinated allocation operation, close the gravity flow valve of the high-level water tank and start the variable frequency booster pump to draw the secondary reclaimed water from the reclaimed water storage tank to supply water to the water points with process water demand. The hydraulic energy storage system is also used to, when the scheduling strategy is energy storage operation, switch the reversible pump turbine to pump operation during periods of low electricity prices, and pump the tertiary reclaimed water in the low-level water storage facility to the high-level water tank.

6. The wastewater treatment plant water energy coordinated control system with embedded micro-water circulation and hydraulic energy storage as described in claim 1, characterized in that, The collaborative control system is also used for: A target function is set for the stated objective, and the target function is: in, p ( k () represents the predicted electricity price for the k-th future control period. This represents the amount of electricity purchased from the grid, and Δt represents the duration of a future control cycle. This refers to the benefits gained through load regulation to reduce electricity costs and participation in grid dispatch. Constraints are set for the target, including: water level safety constraints, power grid dispatch demand response constraints, process safety constraints, equipment operation constraints, and water balance constraints.

7. The wastewater treatment plant water-energy coordinated control system with embedded micro-water circulation and hydraulic energy storage according to any one of claims 1-6, characterized in that, One end of the micro-water circulation treatment unit is connected to the secondary sedimentation tank of the main treatment line of the sewage treatment plant. The micro-water circulation treatment unit includes an artificial wetland and a low-pressure membrane filter assembly connected in sequence. The reclaimed water obtained after treatment by the micro-water circulation treatment unit is stored in a reclaimed water storage tank.

8. The wastewater treatment plant water-energy coordinated control system with embedded micro-water circulation and hydraulic energy storage according to any one of claims 1-6, characterized in that, The hydraulic energy storage system includes an elevated water tank, a low-level water storage facility, a reversible pump-turbine, and a variable frequency booster pump; the low-level water storage facility is connected to the reclaimed water storage tank via a pipeline; the reversible pump-turbine is installed on the connecting pipeline between the elevated water tank and the low-level water storage facility; the motor of the reversible pump-turbine is connected to the power grid via a frequency converter and a two-way switch; the outlet pipeline of the elevated water tank is connected to the main pipeline of the process water distribution network.

9. The wastewater treatment plant water-energy coordinated control system with embedded micro-water circulation and hydraulic energy storage according to any one of claims 1-6, characterized in that, The process water distribution network includes a main pipeline and multiple branch pipelines. The main pipeline is connected to the high-level water tank and variable frequency booster pump of the hydraulic energy storage system. The multiple branch pipelines correspond to multiple water usage points. Each branch pipeline is equipped with a control valve, which leads to the water usage point corresponding to that branch pipeline. The branch pipelines of water usage points that require pressurized water supply are also connected to the variable frequency booster pump, which is connected to the reclaimed water storage tank.

10. The wastewater treatment plant water-energy coordinated control system with embedded micro-water circulation and hydraulic energy storage according to any one of claims 1-6, characterized in that, The collaborative control system includes a collaborative controller. The input control line of the collaborative controller is used to receive predicted data of sewage treatment volume for multiple future control cycles issued by the influent load prediction server, predicted electricity prices for multiple future control cycles issued by the power grid system, the current water level status of the high-level water tank and low-level water storage facility issued by the water level sensor, the instantaneous flow rate of each water use point, and the current water quality of the reclaimed water issued by the water quality sensor. The output control line of the collaborative controller is respectively connected to the influent pump of the micro water circulation treatment unit, the reversible water pump turbine, the variable frequency booster pump, and the control valves of each water use point.

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