PID frequency conversion energy-saving water pressure control system

Abstract

The utility model discloses a PID frequency conversion energy-saving water pressure control system which comprises a water pump circuit, a frequency converter circuit, a pressure sensor circuit, a controller circuit and a PID control circuit, the PID control circuit is arranged in the controller circuit, the controller circuit is connected with the frequency converter circuit and the pressure sensor circuit, and the frequency converter circuit is connected with the pressure sensor circuit. The pressure sensor circuit is connected with a water pump circuit, the water pump circuit is connected with a frequency converter circuit, the controller circuit is connected with a fan circuit, a power supply circuit, an alarm circuit and a power supply indicating circuit, the power supply indicating circuit is connected with the power supply circuit, the alarm circuit is connected with the water pump circuit, and the water pump circuit controls a water pump to provide water pressure. The rotating speed of the water pump is controlled by the frequency converter circuit. According to the PID frequency conversion energy-saving water pressure control system, the rotating speed of the water pump is adjusted through the frequency converter, and a PID control algorithm is combined, so that accurate and rapid adjustment of water pressure is achieved, energy consumption is reduced, and system stability is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to water pump control technical field, especially a kind of PID frequency conversion energy-saving water pressure control system. BACKGROUND

[0002] PID frequency conversion energy-saving water pressure control system is a kind of water pump water pressure control system based on frequency conversion control and PID regulation, suitable for water supply system, industrial water pressure control and other fields, traditional water pump control system usually uses fixed speed operation, adjusts water pressure by valve, there is high energy consumption, low control precision, slow response speed and other problems, with the continuous development of science and technology, people's manufacturing process requirements for PID frequency conversion energy-saving water pressure control system are also higher and higher.

[0003] The existing water pressure control system has certain drawbacks when in use, with the development of frequency conversion technology, frequency conversion control is gradually applied to water pump system, can adjust water pump speed according to actual demand, reduces energy consumption. However, simply relying on frequency conversion control cannot realize the accurate regulation of water pressure, especially in the case of large water pressure fluctuation, system response speed is slow, it is difficult to meet the demand of high-precision water pressure control, therefore, how to combine frequency conversion control and PID regulation technology, realize the accurate and rapid control of water pressure, become the problem to be solved in the field, for this purpose, we provide a kind of PID frequency conversion energy-saving water pressure control system. SUMMARY

[0004] The technical problem solved: in view of the deficiencies of prior art, the utility model provides a kind of PID frequency conversion energy-saving water pressure control system, adjusts water pump speed by frequency converter, and realizes the accurate and rapid regulation of water pressure by combining PID control algorithm, reduces energy consumption, improves system stability, can effectively solve the problems in background art.

[0005] Technical scheme: in order to achieve the above purpose, the technical scheme adopted by the utility model is as follows: a kind of PID frequency conversion energy-saving water pressure control system, including water pump circuit, frequency converter circuit, pressure sensor circuit, controller circuit and PID control circuit, the PID control circuit is arranged in the controller circuit, the controller circuit is connected with frequency converter circuit and pressure sensor circuit, the pressure sensor circuit is connected with water pump circuit, the water pump circuit is connected with frequency converter circuit, the controller circuit is connected with fan circuit, power supply circuit, alarm circuit and power supply indication circuit, the power supply indication circuit is connected with power supply circuit, the alarm circuit is connected with water pump circuit.

[0006] Preferably, the water pump circuit controls water pump to provide water pressure, and the speed of water pump is controlled by frequency converter circuit.

[0007] Preferably, the frequency converter circuit is used to adjust the speed of the water pump, and the frequency converter circuit receives signals from the controller circuit and adjusts the speed of the water pump.

[0008] Preferably, the pressure sensor circuit is used to detect the water pressure of the water pump in real time and transmit the detected water pressure signal to the controller circuit.

[0009] Preferably, the controller circuit is used to receive the signal from the pressure sensor circuit, and calculate the control signal of the frequency converter circuit through the PID control circuit according to the preset target water pressure value, and adjust the speed of the water pump.

[0010] Preferably, the PID control circuit is located inside the controller circuit and calculates the control signal of the frequency converter circuit based on the water pressure deviation value to achieve precise water pressure adjustment. The deviation value is the difference between the target water pressure and the actual water pressure.

[0011] Preferably, the power indicator circuit displays the operating status of the power supply circuit, and the alarm circuit monitors the operating status of the water pump in real time and transmits the signal to the controller circuit.

[0012] Preferably, the formula for the PID control circuit is: u(t)=Kp·(t)+Ki·∫e(t)dt+Kd·de(t)dtu(t)=Kp·e(t)+K i ·∫e(t)dt+K d ·dtde(t), where u(t) is the output signal of the controller, e(t) is the water pressure deviation value, Kp is the proportional coefficient, Ki is the integral coefficient, and Kd is the derivative coefficient.

[0013] Beneficial effects: Compared with the prior art, this utility model provides a PID variable frequency energy-saving water pressure control system, which has the following beneficial effects: This PID variable frequency energy-saving water pressure control system adjusts the water pump speed through a frequency converter and combines it with a PID control algorithm to achieve precise and rapid adjustment of water pressure, reduce energy consumption, and improve system stability;

[0014] Energy-saving and efficient: The pump speed is adjusted by frequency conversion control, avoiding the energy loss caused by traditional valve adjustment and reducing system energy consumption;

[0015] High control precision: Combined with PID control algorithm, it can achieve precise water pressure regulation, fast response speed and small steady-state error;

[0016] Good system stability: The PID control algorithm can effectively suppress system overshoot and oscillation, thus improving system stability;

[0017] Wide application range: the PID variable frequency energy-saving water pressure control system is suitable for various water supply systems, industrial water pressure control and the like, has wide application prospect, has simple structure, convenient operation and better use effect relative to traditional mode. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a whole structure schematic view of the PID variable frequency energy-saving water pressure control system.

[0019] Figure 2 It is a power supply circuit schematic view of the PID variable frequency energy-saving water pressure control system.

[0020] Figure 3 It is a structure schematic view of the alarm circuit of the PID variable frequency energy-saving water pressure control system.

[0021] Figure 4 It is a structure schematic view of the frequency converter circuit of the PID variable frequency energy-saving water pressure control system.

[0022] Figure 5 It is a structure schematic view of the water pump circuit of the PID variable frequency energy-saving water pressure control system.

[0023] Figure 6 It is a structure schematic view of the frequency converter circuit of the PID variable frequency energy-saving water pressure control system. DETAILED DESCRIPTION

[0024] The technical scheme of the utility model will be described clearly and completely in combination with the drawings and specific embodiments, but the person skilled in the art will understand that the following described embodiments are part of the embodiments of the utility model, instead of all the embodiments, are used for explaining the utility model only, and should not be regarded as limiting the scope of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without making creative labor all belong to the scope of protection of the utility model. The unmarked specific conditions in the embodiments are carried out according to conventional conditions or the conditions suggested by the manufacturer. The reagents or instruments used are not marked with the manufacturer, and are all conventional products that can be obtained by market purchase.

[0025] In the description of the utility model, it needs to explain, the term "center", "upper", "lower", "left", "right", "vertical", "horizontal", "internal", "external" and so on indicate the orientation or position relation based on the orientation or position relation shown in the drawing, only for the convenience of describing the utility model and simplifying the description, and not indicate or imply that the device or element must have a particular orientation, construct and operate in a particular orientation, therefore, it cannot be understood as a limitation on the utility model. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0026] In the description of the utility model, it needs to explain, unless otherwise explicitly provided and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected, it can be mechanical connection, or electrical connection, it can be directly connected, or indirectly connected through intermediate medium, it can be the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0027] As shown in Figures 1-6 PID variable frequency energy-saving water pressure control system, including water pump circuit, frequency converter circuit, pressure sensor circuit, controller circuit and PID control circuit, PID control circuit is arranged in the controller circuit, the controller circuit is connected with frequency converter circuit and pressure sensor circuit, pressure sensor circuit connects water pump circuit, water pump circuit connects frequency converter circuit, the controller circuit is connected with fan circuit, power supply circuit, alarm circuit and power supply indication circuit, power supply indication circuit connects power supply circuit, alarm circuit connects water pump circuit, the rotation speed of water pump is adjusted through frequency converter, and the accurate, rapid regulation of water pressure is realized in combination with PID control algorithm, energy consumption is reduced, and system stability is improved.

[0028] Further, the water pump circuit controls the water pump to provide water pressure, and the rotation speed of the water pump is controlled by the frequency converter circuit.

[0029] Further, the frequency converter circuit is used for adjusting the rotation speed of the water pump, and the frequency converter circuit receives signals from the controller circuit and adjusts the rotation speed of the water pump.

[0030] Further, the pressure sensor circuit is used for real-time detection of the water pressure of the water pump, and the detected water pressure signal is transmitted to the controller circuit.

[0031] Further, the controller circuit is used for receiving signals of the pressure sensor circuit, and according to the preset target water pressure value, the control signal of the frequency converter circuit is calculated through the PID control circuit, and the rotation speed of the water pump is adjusted.

[0032] Further, the PID control circuit is set inside the controller circuit and calculates the control signal of the frequency converter circuit according to the deviation value of the water pressure, realizing accurate adjustment of the water pressure, and the deviation value is the difference between the target water pressure and the actual water pressure.

[0033] Further, the power indication circuit displays the working state of the power circuit, and the alarm circuit monitors the working state of the water pump in real time and transmits the signal to the controller circuit.

[0034] Further, the formula of the PID control circuit is: u(t) = Kp·(t) + Ki·∫e(t)dt + Kd·de(t)dt u(t) = Kp·e(t) + Ki·∫e(t)dt + Kd·dtde(t), where u(t) is the output signal of the controller, e(t) is the water pressure deviation value, Kp is the proportional coefficient, Ki is the integral coefficient, and Kd is the differential coefficient. i d

[0035] System structure: The system includes a water pump, a frequency converter, a pressure sensor, and a controller. The pressure sensor detects the water pressure in real time and transmits the detected water pressure signal to the controller. The controller calculates the control signal of the frequency converter through the PID control algorithm according to the preset target water pressure value and the actual water pressure value, and adjusts the speed of the water pump.

[0036] System workflow: The system continuously detects and adjusts to gradually approach the target water pressure, realizing accurate control of the water pressure.

[0037] The pressure sensor detects the water pressure in real time and transmits the detected water pressure signal to the controller.

[0038] The controller calculates the water pressure deviation value e(t) according to the preset target water pressure value and the actual water pressure value.

[0039] The controller calculates the control signal u(t) of the frequency converter through the PID control algorithm and sends the signal to the frequency converter.

[0040] The frequency converter adjusts the speed of the water pump according to the received control signal, thereby adjusting the water pressure.

[0041] The system continuously detects and adjusts to gradually approach the target water pressure, realizing accurate control of the water pressure.

[0042] Water pump: used to provide water pressure, the speed of the water pump is controlled by the frequency converter.

[0043] Frequency converter: used to adjust the speed of the water pump, the frequency converter receives the signal from the controller and adjusts the speed of the water pump.

[0044] Pressure sensor: used to detect the water pressure in real time and transmit the detected water pressure signal to the controller.​​

[0045] Controller: receives the signal of the pressure sensor and calculates the control signal of the frequency converter according to the preset target water pressure value through the PID control algorithm to adjust the speed of the water pump.

[0046] PID control algorithm: the PID control algorithm is built-in in the controller, which calculates the control signal of the frequency converter according to the deviation value of the water pressure (the difference between the target water pressure and the actual water pressure) to realize accurate adjustment of the water pressure.

[0047] The formula of the PID control algorithm is as follows:

[0048] u(t) = Kp·e(t) + Ki·∫e(t)dt + Kd·de(t)dt u(t) = Kp·e(t) + Ki·∫e(t)dt + Kd·de(t)dt i

[0049] Ki·∫e(t)dt + Kd·de(t)dt d Ki·∫e(t)dt + Kd·de(t)dt

[0050] Where:

[0051] u(t) is the output signal of the controller, which is used to adjust the frequency of the frequency converter;

[0052] e(t) is the water pressure deviation value, which is the difference between the target water pressure and the actual water pressure;

[0053] Kp is the proportional coefficient, which is used to adjust the response speed of the system;

[0054] Ki is the integral coefficient, which is used to eliminate the steady-state error of the system;

[0055] Kd is the differential coefficient, which is used to suppress the overshoot and oscillation of the system.

[0056] The frequency converter adjusts the speed of the water pump according to the received control signal, thereby adjusting the water pressure.

[0057] The system continuously detects and adjusts to gradually approach the target water pressure, realizing accurate control of the water pressure.

[0058] It is to be noted that, in the present document, relational terms such as first and second, and the like can be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by "comprises... a" does not, without more constraints, exclude the existence of additional identical elements in the process, method, article, or apparatus that comprises the element.

[0059] The basic principle and main features of the present application and the advantages of the present application are shown and described above. Those skilled in the art should understand that the present application is not limited by the above-mentioned embodiments, and the above-mentioned embodiments and descriptions in the specification are only to illustrate the principle of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the claimed present application.

Claims

1. A PID variable frequency energy-saving water pressure control system, comprising a water pump circuit, a frequency converter circuit, a pressure sensor circuit, a controller circuit and a PID control circuit, characterized in that: The PID control circuit is arranged in the controller circuit, the controller circuit is connected with the frequency converter circuit and the pressure sensor circuit, the pressure sensor circuit is connected with the water pump circuit, the water pump circuit is connected with the frequency converter circuit, the controller circuit is connected with the fan circuit, the power supply circuit, the alarm circuit and the power supply indication circuit, the power supply indication circuit is connected with the power supply circuit, and the alarm circuit is connected with the water pump circuit.

2. The PID variable frequency energy-saving water pressure control system according to claim 1, characterized in that: The water pump circuit controls the water pump to provide water pressure, and the rotating speed of the water pump is controlled by the frequency converter circuit.

3. The PID variable frequency energy-saving water pressure control system according to claim 1, characterized in that: The frequency converter circuit is used for adjusting the rotating speed of the water pump, and the frequency converter circuit receives the signal from the controller circuit and adjusts the rotating speed of the water pump.

4. The PID variable frequency energy-saving water pressure control system according to claim 1, characterized in that: The pressure sensor circuit is used for detecting the water pressure of the water pump in real time, and transmitting the detected water pressure signal to the controller circuit.

5. The PID variable frequency energy-saving water pressure control system according to claim 1, characterized in that: The controller circuit is used for receiving the signal of the pressure sensor circuit, calculating the control signal of the frequency converter circuit through the PID control circuit according to the preset target water pressure value, and adjusting the rotating speed of the water pump.

6. The PID variable frequency energy-saving water pressure control system according to claim 1, characterized in that: The PID control circuit is arranged in the controller circuit, and the control signal of the frequency converter circuit is calculated according to the deviation value of the water pressure, so that the water pressure is accurately adjusted, and the deviation value is the difference between the target water pressure and the actual water pressure.

7. The PID variable frequency energy-saving water pressure control system according to claim 1, characterized in that: The power supply indication circuit displays the working state of the power supply circuit, and the alarm circuit monitors the working state of the water pump in real time and transmits the signal to the controller circuit.

8. The PID variable frequency energy-saving water pressure control system according to claim 1, characterized in that: The formula for the PID control circuit is: u(t)=Kp·(t)+Ki·∫e(t)dt+Kd·de(t)dtu(t)=Kp·e(t)+K i ·∫e(t)dt+K d ·dtde(t), where u(t) is the output signal of the controller, e(t) is the water pressure deviation value, Kp is the proportional coefficient, Ki is the integral coefficient, and Kd is the derivative coefficient.

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