873results about "Pumping plants" patented technology

The invention provides an automatic energy-saving control method and device for a ring cooling fan based on load feedback, relates to the field of ring cooling fans, and solves the technical problem of delay of regulation and control in an energy-saving working state. The method comprises the steps that working condition data are input into a preset powder box model, and a feed-forward air volume instruction is obtained through calculation; and inputting the working condition data into a state observer to obtain an optimal estimated temperature value. And the deviation between the optimal estimated temperature value and a preset temperature set value is calculated, and a feedback air volume compensation instruction is obtained through calculation of a feedback controller according to the deviation. And fusing the feed-forward air volume instruction and the feedback air volume compensation instruction to obtain a final air volume control instruction, and issuing the final air volume control instruction to a fan frequency converter for execution. And continuously monitoring the numerical value and the change trend of the feedback air volume compensation instruction, taking the feedback air volume compensation instruction as a prediction error signal of the powder box model, and adaptively adjusting key thermal parameters in the powder box model. The method is used in the control process of the ring cooling fan.

The invention belongs to the technical field of water supply network adjustment, and particularly relates to a water supply network pressure and flow adjusting method. The method comprises the following steps: firstly, collecting pressure, flow and water temperature data of a monitoring node at present and in a preset time period, wherein the preset time period is set according to a water consumption period; preprocessing flow data through a sliding window method and fitting a curve, and marking an instantaneous disturbance time period; the dynamic response coefficient of each disturbance time period is calculated, and water temperature correction is needed; combining the flow standard score, the dynamic response coefficient and the real-time deviation coefficient to obtain a flow dynamic regulation index; a pressure stability index is obtained through pressure and water temperature trend feature vector matching; the two are subjected to weighted fusion to form a pipe network comprehensive regulation factor, and the valve opening and the water pump power are regulated accordingly. The method can accurately identify instantaneous disturbance, improve the adjustment precision and response speed, and guarantee stable water supply.

The invention provides a robust control automatic setting method for a constant-pressure water supply system, and the method comprises the steps: obtaining a system working condition in real time, and extracting multi-dimensional state parameters including real-time flow, pressure deviation, current deviation and power deviation; the current load working condition is judged according to the pressure deviation, disturbance characteristics are analyzed by integrating all parameters, and the disturbance grade and type are determined. On the basis, robust control parameters are automatically set in combination with real-time working conditions, load conditions and disturbance characteristics of the system. And finally, performing multi-stage cooperative control on the system by using the set parameters, so that the constant-pressure water supply system is automatically set. According to the robust control automatic setting method for the constant-pressure water supply system, load working conditions and disturbance characteristics are recognized based on multi-dimensional state parameters, robust control parameters are self-set in a targeted mode, and automatic setting of the constant-pressure water supply system is achieved through multi-stage cooperative control. Therefore, the intelligent level of the constant-pressure water supply system and the adaptability in different operation environments are effectively improved.

The invention relates to the field of pump room intelligent control, and particularly discloses a pump room control method and system. The method comprises the steps that pump body vibration signals and current signals are collected, and input characteristic data of a unified structure are constructed; inputting the feature data into the fusion depth diagnosis model, extracting multi-dimensional features, completing association modeling, and generating a risk assessment information structure; generating an alarm mark and an isolation demand according to the risk information, and executing a fault pump isolation operation; a standby pump scheduling sequence is generated according to the isolation result, and a switching instruction is sent out; and combining system feedback information to optimize a diagnosis model and a scheduling strategy. According to the invention, the fault identification precision, the isolation control efficiency and the intelligent level of standby pump dispatching of the pump room under complex working conditions are obviously improved.

A control system for a plumbing fixture includes at least a network device, a plumbing fixture, and a controller. The network device is configured to detect a plurality of connections for mobile devices in an indoor space associated with the plumbing fixture. A controller configured to compare the plurality of connections to an occupancy threshold and generate a command for the plumbing fixture.

The invention discloses a building water supply and drainage system based on a PLM platform and a forward design method, and relates to the technical field of building water supply and drainage systems. The drainage subsystem is used for draining domestic sewage and rainwater in the building; the fire-fighting detection module is used for detecting the fire condition in the building; the intelligent control module is used for monitoring and controlling the operation states of the water supply subsystem and the water drainage subsystem; the fire-fighting detection module is electrically connected with the intelligent control module, and controls the water supply subsystem to reduce the supply amount of domestic water and increase the supply amount of fire-fighting water when detecting that a fire occurs in the building; and the PLM platform integration module is used for realizing data integration and management in the stages of design, construction and operation and maintenance. Intelligent and integrated management of the building water supply and drainage system is achieved.

The present invention discloses an integrated pump gate with automatic cleaning and anti-clogging functions, specifically relating to the field of integrated pump gates, comprising a main frame, a filter screen fixedly provided at the front end of the main frame, a cleaning mechanism provided at the front end of the filter screen, a sedimentation well provided on the inner side of the main frame, a sludge pump provided on one side of the sedimentation well, a motor box fixedly provided on one side of the main frame, and a collection box fixedly provided on the other side of the main frame. The present invention can realize the rotation of the crushing knife and the automatic collection of debris while driving the cleaning plate to move by driving the motor to clean the debris on the filter screen. The collected debris can rise upward, making it convenient for staff to guide the debris out from the upper end of the collection box without stopping the operation of the integrated pump gate, and can squeeze out the granular debris that clogs the filter screen to prevent clogging of the filter screen.

This application provides a constant pressure water supply control method, system, and medium for a standardized secondary water supply pump station. The method includes: acquiring and processing multiple historical water supply data points within a preset time period, including water supply time data, corresponding pump water supply pressure data, and user node water supply pressure data, to obtain the water supply pressure level and corresponding water supply pressure and time; processing this data in conjunction with the user node water supply pressure to obtain the pipeline pressure loss value corresponding to the water supply pressure level; acquiring and processing real-time water supply time point data to obtain the water supply pressure level, corresponding water supply pressure, and pipeline pressure loss value, to obtain the real-time demand water supply pressure of the pump; then implementing water supply and acquiring and processing real-time water supply pressure data from user nodes to obtain a real-time water supply evaluation index; finally, performing threshold comparison and adjusting the water supply mode based on the comparison results; thereby achieving constant pressure water supply and precise control of the secondary water supply while reducing energy consumption.

The invention relates to a tail end constant-pressure water supply strategy adjusting method and system based on AI, and belongs to the technical field of secondary water supply.The constant-pressure water supply strategy adjusting method comprises the steps that the flow of a header pipe and real-time health state data of each running pump are periodically collected; according to the header pipe flow, the dynamic demand lift is calculated, and all feasible pump set combination strategies are generated in combination with the dynamic demand lift and the real-time health state data; the score of each candidate strategy is calculated, the candidate strategy with the highest score is used as a pump set scheduling strategy, the pump with the most matched performance is selected from candidate pump sets corresponding to the pump set scheduling strategy to serve as a frequency conversion main guide pump, and the other pumps serve as frequency conversion auxiliary pumps; according to the set minimum service pressure and the dynamic demand lift, the target pressure of a pump outlet is calculated; and according to the target pressure and the actually-collected pump outlet pressure, the rotating speed of the variable-frequency main guide pump is adjusted. The method has the beneficial effects that the power of the pump set is matched with the actual requirement, so that the operation cost is reduced.

The invention relates to the technical field of water supply device control, and discloses a water supply device temperature control method and device, a water supply device and a medium, and the method is used for controlling the water supply device and comprises the steps that a water outlet instruction is obtained, and the water outlet instruction comprises the target temperature; the water outlet instruction is responded, and the normal temperature water temperature and temperature adjusting configuration of the water supply device are obtained; based on the target temperature, the normal temperature water temperature and the temperature adjusting configuration, a water outlet control instruction is determined; and controlling the water supply device to discharge water based on the water discharge control instruction. According to the temperature control scheme of the water supply device, the response speed of temperature control can be increased, temperature fluctuation can be reduced, and the diversified requirements of users for water using at different temperatures can be flexibly met.

The invention discloses a water hammer protection device for a large deeply-buried long-distance water delivery pump station, and relates to the technical field of water conservancy project protection. The water hammer protection device comprises a buffer pool, a water inlet pipe is fixedly connected to the side edge of the buffer pool, and a water outlet pipe is fixedly connected to the side, away from the water inlet pipe, of the buffer pool; the anti-seismic mechanism comprises a power fan arranged in the water outlet pipe, a transmission rod is fixedly connected to the side, close to the water outlet pipe, of the power fan, a first bevel gear is fixedly connected to the side, away from the power fan, of the transmission rod, a second bevel gear is meshed with the side edge of the first bevel gear, and a threaded rod is fixedly connected to the side edge of the second bevel gear. A movable plate is in threaded connection with the upper portion of the threaded rod, a connecting rod is fixedly connected to the side edge of the movable plate, and a base plate is fixedly connected to the side, away from the movable plate, of the connecting rod, the change of the water flow speed can be responded in real time, and when the water flow speed changes suddenly, the device can rapidly adjust the anti-seismic state, and impact vibration generated by the water hammer effect is effectively reduced; and the pipeline and the pump machine are protected from being damaged.

The system comprises a reservoir, a water diversion weir, a communicating tunnel, a water lifting pump station, a check gate and a control valve, the reservoirs comprise a concentration reservoir, a communication reservoir, a low-level reservoir and a high-level reservoir; the water diversion weir is connected with the concentration reservoir through the communicating tunnel; the communicating tunnel is a water delivery channel for connecting the reservoir, the water diversion weir, the water lifting pump station, the check gate and the control valve; the water pumping station is positioned at the head part of the communicating tunnel connected with the low-level reservoir; the check gate is located on the communicating tunnel and is generally arranged close to the reservoir; and the control valve is positioned on the communicating tunnel connected with the low-level reservoir and is arranged in parallel with the water pumping station. According to the method, reservoir building regulation and storage are conducted on the branches suitable for reservoir building, flood resource utilization is achieved from the branches which are large in abandoned water and not suitable for reservoir building, or the reservoirs with the problems of height increasing and capacity expanding, and multi-water-source networking multi-branch water transfer, the water supply amount can be increased, the flood control capacity is improved, environmental water use is guaranteed, and three purposes are achieved through one stroke.

The integrated prefabricated pump station with the self-cleaning function for the intelligent water engineering comprises a pump station body, an observation window is arranged on the outer side of the pump station body, a funnel is fixedly installed on the inner wall of the pump station body, a top cover is fixedly installed on the top side of the pump station body, and an external connecting pipe is arranged on the top cover. Through the arrangement of the mounting sleeve, the first cleaning rod, the second cleaning rod, the second brush, the second scraping plate and the funnel, due to the fact that the inner wall of the funnel is obliquely arranged, sludge can conveniently flow into the sewage draining exit along the inclined slope, and the sludge can be conveniently cleaned. And the bottom side of the first cleaning rod and the bottom side of the second cleaning rod are obliquely arranged, so that the other end of the second brush and the other end of the second scraping plate are also attached to the inclined slope of the funnel, sludge and sediment attached to the funnel can be conveniently cleaned, and the situation that accumulated sludge and sediment can affect operation of the pump station body is avoided.

The invention discloses a movable flood drainage robot and a flood drainage method, and relates to the field of fire fighting equipment application. The movable flood drainage robot comprises track driving systems, a mounting frame is arranged between the track driving systems, a water pump is mounted at the top of the mounting frame, a water inlet is formed in one side of the water pump, and a soft water conveying pipe is arranged at the water inlet and connected with a movable water inlet pipe; the movable water pipe can be adjusted in height and rotated. By arranging the movable water inlet pipe capable of movably ascending, descending and rotating, the water pumping efficiency can be ensured, the situation that sludge, leaves and other impurities enter the water pump can be reduced, the movable water inlet pipe is adjusted to the position about 15-20 cm below the accumulated water liquid level through the lifting assembly, and the height of the movable water inlet pipe is synchronously reduced along with reduction of the liquid level; impurities floating on the liquid level are located above the movable water inlet pipe all the time and not prone to entering the water pump, when the movable water inlet pipe descends to the lowest working height, the movable water inlet pipe can turn over by 90 degrees to be perpendicular to the ground, and the impurities floating on the liquid level can be reduced and enter the water pump due to the filtering effect of the filtering assembly.

The invention relates to the technical field of agricultural water conservancy control, in particular to a high-standard farmland intelligent irrigation and drainage pump gate cooperative remote control method and system, and the method comprises the steps: generating a cooperative control instruction which restrains the power of a water pump and the opening and closing of a gate at the same time based on farmland water level information; establishing a conflict relationship between the response delay time of the water pump and the action delay time of the gate, and disassembling the cooperative control instruction into control sub-instructions for the water pump and the gate; when the soil under-saturation signal is continuously detected, the distribution adjustment control sub-instruction adjusts the output power of a water pump and controls the opening degree of an irrigation gate; when the water level overrun signal is continuously detected, the control sub-instruction is adjusted to control the opening degree of the drainage gate, and the output power of the water pump is reversely adjusted based on a backwater shock wave model triggered by the gate opening degree; the farmland water level information is detected in real time, and a cooperative control instruction is reconstructed. According to the invention, the problem of water level oscillation caused by misalignment of cooperative control of the water pump and the gate due to response time delay difference is effectively solved.

A recirculating shower system that can supply recirculated water to one or more spray heads to conserve water consumption during use and reduce water pollution. The recirculated water may be combined with fresh water to maintain comfortable conditions of the water being dispensed via the one or more spray heads. The recirculating shower system may include a flow control valve that operates to control the fresh water supply and a recirculation skid that controls the supply of the recirculated-fresh water mixture. The recirculation skid may include one or more inline cleaning devices that are operable to generate cleaned water that can be distributed throughout the recirculated water plumbing for intermittent or periodic cleaning.

The invention belongs to the technical field of engineering management, and provides an all-terrain mobile pump station rapid drainage self-adaptive adjusting system which comprises the steps of detecting whether a pipeline resistance difference phenomenon occurs between pump stations or not based on pipeline resistance of the pump stations in a series working state, if yes, detecting a flow difference phenomenon between the pump stations, and if not, determining whether the pipeline resistance difference phenomenon occurs between the pump stations; and performing correlation analysis on the pipeline resistance difference and the flow difference on the time change dimension and the trend change dimension, if correlation change exists, determining a resistance difference allowable value domain, and when the pipeline resistance difference reaches an early warning state, predicting a critical time point of the pipeline resistance difference in combination with the resistance difference allowable value domain. Whether self-adaptive adjustment of the pipeline resistance needs to be carried out or not is judged, if yes, pipeline resistance volatility comparison is carried out, a target adjustment pipeline and an adjustment reference pipeline are determined, a self-adaptive adjustment mechanism of the target adjustment pipeline is set, flow abnormity caused by pipeline resistance unbalance is effectively prevented, and the drainage efficiency is improved.

The invention is applicable to the technical field of hydraulic engineering and water supply and drainage, and provides a water intake pumping station with a large variable-amplitude water level, which comprises a pump room and a reinforced concrete guide rail arranged on a dam, and moving wheels used for being matched with the reinforced concrete guide rail are arranged on the side surface, close to the dam, of the pump room. The dam is further provided with a lifting assembly used for adjusting the working height of the pump room. The water taking assembly comprises a plurality of pump room water pumps, a telescopic pipe and a water taking opening, the pump room water pumps are arranged in the pump room, the output ends of the pump room water pumps are connected to the same gathering pipe, the gathering pipe is further connected with a main outlet pipe, the input ends of the pump room water pumps are connected with the water taking opening through the telescopic pipe, and a rotary filter screen is arranged at the bottom of the water taking opening; the automatic water suction device can automatically adapt to the variable amplitude of the water level of 20 m or above, the water pump is located at the optimal water suction depth all the time, and the risk of'air suction 'or submerging is avoided.

The invention discloses a secondary water supply pump station remote operation and maintenance method and system based on the Internet of Things, relates to the technical field of resource management, and realizes accurate identification of'micro water hammer 'implicit disturbance by collecting water supply related data, constructing a disturbance residual factor Dk, judging a water supply state and obtaining a dislocation characteristic index. The problem of missed judgment of short-time and low-amplitude dislocation behaviors in a traditional method is solved, periodic risk fluctuation is quantified through autocorrelation analysis of a time interval sequence, finally, an adjustment strategy is generated in real time in combination with a disturbance countermeasure library and is issued to a main control system, closed-loop control and self-adaptive correction of structural water hammer risks are achieved, and the accuracy of the structural water hammer risk is improved. And the steady-state operation capability of the secondary water supply pump station is effectively improved.

The invention relates to the technical field of mine water treatment and utilization, and discloses a mine water resource comprehensive utilization system and method based on multi-target coupling, and the system comprises a multi-source mine water collection module which collects mine water in different underground areas; the hierarchical storage and adjustment module is used for performing hierarchical storage and adjustment on the mine water; the target guiding purification module is used for carrying out targeted purification treatment on the adjusted mine water to generate standard industrial water to be used or irrigation water to be used; the multi-scene utilization module is used for conveying the industrial to-be-used water or the irrigation to-be-used water which reaches the standard to a corresponding water utilization scene and carrying out industrial or agricultural scene water supply utilization; the intelligent coupling regulation and control center module is used for establishing a dual-objective function for maximizing the water resource utilization rate and minimizing the system energy consumption according to the monitoring state data of all the modules and the initial system control instruction and constraint conditions, and performing iterative solution by adopting a multi-objective particle swarm optimization method to generate an optimal control instruction; the utilization rate of mine water resources is greatly increased.

The utility model discloses a trash holding device for a pump station, which comprises a pump station body, one side of the pump station body is provided with a water inlet pipe, and the trash holding device also comprises an intercepting unit which is arranged on the inner side of the pump station body, is communicated with the water outlet end of the water inlet pipe and is used for intercepting blocky soil or floating objects contained in sewage entering from the water inlet pipe; the sewage disposal unit comprises an extrusion assembly which is arranged on the upper portion of the intercepting unit and used for extruding the blocky soil or floating objects intercepted by the intercepting unit, and a crushing assembly which is arranged on the lower portion of the intercepting unit and used for being matched with the extrusion assembly to crush and discharge the blocky soil or floating objects. Blocky soil accumulated on the bottom plate is crushed by the extrusion blocks and then discharged along gaps between the extrusion blocks and the extrusion holes and gaps between the extrusion blocks and the through holes, floating objects are cut into pieces under the action of shearing force between the extrusion blocks and the extrusion holes, the floating objects cut into small pieces are discharged from the intercepting unit along the extrusion holes and the through holes, and the intercepting device does not need to be manually cleaned.

The invention relates to a multi-groove connected water taking head device which comprises a plurality of water taking heads, and the water taking heads are communicated with one another through connecting pipes and then connected with a water taking pipeline. The water taking head is cylindrical and is made of a fiber composite material, at least two circles of water inlets are formed in the upper part of the water taking head, grids are arranged at the water inlets, and the two circles of water inlets are parallel to each other and are arranged up and down, so that the water taking head can adjust the water inlet position according to the water level and water quality of the external environment; a counterweight interlayer is arranged at the lower part of the outer side of the water taking head and is used for accommodating a counterweight so as to stabilize the water taking head; a precipitation promoting part protruding upwards is arranged in the middle of the bottom of the water taking head, and the precipitation promoting part is provided with an inclined side face, so that silt in the water taking head can slide and precipitate along the side face of the precipitation promoting part; and the interior of the precipitation promoting part is hollow and is provided with a submersible sewage pump, and the submersible sewage pump is used for discharging silt at the bottom of the water taking head to the outer side of the water taking head so as to supplement the silt lost after the original mud surface is scoured and reduced, so that the stability of the water taking head is improved.

The utility model relates to the technical field of rainwater recycling, in particular to a hill and mountain stepped multi-span greenhouse rainwater recycling system which comprises a greenhouse, a rainwater tank, a downpipe, a low-level reservoir, a filter tank, a high-level reservoir, a ground recycling ditch and a stack retting tank. Rainwater enters the low-level reservoir along the downpipe, the rainwater is filtered through the filter tank, the rainwater entering the low-level reservoir is transferred into the high-level reservoir to be stored, rainwater on the ground near the greenhouse is recycled through the ground recycling ditch, the rainwater is filtered through the filter tank, and the rainwater enters the low-level reservoir. And the rainwater is transferred into the high-level reservoir for storage, so that the problems that the rainwater runoff is fast and the rainwater is difficult to collect in a centralized manner due to topographic relief of the existing rainwater recovery equipment in hills and mountains are solved.

The utility model relates to a water shortage protection device for an intelligent pump room. The water shortage protection device comprises a power supply module, an acquisition module, a CPU module, a relay control module, a communication module, a display module and a reserved interface module. The power supply module provides a working power supply; the acquisition module is connected with the CPU module and is used for acquiring the liquid level of a clean water tank of a pump room; the CPU module is used for data processing; the communication module is connected with the CPU module and is used for sending data information to a pump room host; the relay control module is connected with the CPU module and used for indicating that the current liquid level is lower than the lower limit or higher than the upper limit. The display module is connected with the CPU module and is used for displaying the liquid level data and the operation parameters of the clean water tank and setting the parameters and correcting time in a touch control manner; and the reserved interface module (70) is connected with the CPU module, and is used for protecting and upgrading the system.

The apparatus comprises a water tank 12 containing a volume of water, an inlet 28 to the water tank for connection to the mains water supply, a mains supply valve 14, an outlet 30 connected to the wat

The invention discloses an automatic water collection irrigation device based on photovoltaic power supply, and relates to the technical field of water collection irrigation, the automatic water collection irrigation device based on photovoltaic power supply comprises a water collection tank, the water collection tank is provided with a supporting rod, the top of the supporting rod is provided with a photosensitive sensor, and an energy storage processor is provided with a controller. A servo motor is installed on the water pump, control teeth are installed at the output end of the servo motor, an adjusting knob is arranged on the flow regulator, a rotating rod is installed on the adjusting knob, adjusting teeth are installed on the rotating rod, and the adjusting teeth are meshed with the control teeth. The sunlight irradiation intensity is detected in real time through the photosensitive sensor, the controller can control the servo motor to rotate correspondingly, and therefore the rotating rod can drive an adjusting knob on the flow adjuster to conduct corresponding rotating adjustment through the meshing effect of the control teeth and the adjusting teeth.

The utility model provides a water resource recycling device based on agriculture and light complementation. The water resource recycling device comprises a water resource recycling box, an agriculture irrigator, a water resource collecting tank and a photovoltaic module flusher, at least one water resource recycling box is arranged close to the photovoltaic module, a photovoltaic module flusher is arranged at the top of the photovoltaic module, and the water inlet end of the photovoltaic module flusher is communicated with a water conveying pipeline of the water resource recycling box; and a water resource collecting tank is arranged at the bottom of the photovoltaic module, and the bottom of the water resource collecting tank is communicated to the water resource recycling box through a collecting pipeline. According to the utility model, the water resource collecting tank is arranged to collect water for the cleaning assembly and natural rainfall, and the water resource is recycled for daily use of an agricultural-light complementary project through the water resource recycling box, the photovoltaic assembly flusher and the agricultural irrigator, so that the recycling of the water resource of the agricultural-light complementary photovoltaic power station area is realized, and the utilization rate of the agricultural-light complementary photovoltaic power station area is improved. The utilization rate of water resources is increased, and the growth environment of crops under the plate is improved.

A trailer type mobile sanitary apparatus includes a housing that forms an interior space having a flushable toilet and a wash basin. The trailer type mobile sanitary apparatus further includes a wash basin drainage system and a septic tank that is separated from the wash basin drainage system and includes a decomposer configured to separate liquids from solids for a separate discharge. The housing securely positioned on a tray type trailer with a septic tank being formed in the tray type trailer. The tray type trailer further includes a technical room with an electric system and a water supply system.

The utility model relates to the technical field of pump stations, and discloses a water and electricity separated box type pump station which comprises a supporting plate, a plurality of supporting columns are fixedly connected to the top of the supporting plate, a water tank is fixedly connected to the tops of the supporting columns, and an electrical room is fixedly connected to the position, located on one side of the water tank, of the top of the supporting plate. A ventilation fan is fixedly installed on the outer wall of the electrical room, a water pump room is fixedly connected to the position, below the electrical room, of the bottom of the supporting plate, and a water pump is fixedly installed on the inner bottom wall of the water pump room. According to the water and electricity separation type box-type pump station, through mutual cooperation of the electrical room and the water pump, the water pump and the conveying pipeline can be arranged below the electrical room, so that electrical equipment can be separated from water, even if water leakage occurs, the electrical equipment cannot be affected, and after water leakage occurs, the water and electricity separation can be achieved. Workers do not need to worry about the situation of electric leakage caused by the high water level, electrical equipment is safely controlled and operated, and the overall safety of the device is improved.

The disclosure provides a controller and server combination, which implements a set of software programs to control a booster pump system. In a preferred embodiment, the software derives quadratic models for the pump performance curves, and the system curve. The system monitors the flow rate of the system, the pump performance curve model and the system curve model to adjust the drive frequency and the number of active pumps to meet flow rate demand efficiency.