A flow battery pump cooperative control method and system based on parameter soft measurement

Abstract

The application discloses a kind of based on parameter soft measurement's liquid flow battery pump collaborative control method and system, the method includes the measurement data of real-time acquisition of liquid flow battery;Combining viscosity soft measurement model calculation obtains the real-time viscosity value of positive and negative electrolyte, and then respectively calculates and obtains positive and negative target flow;The actual lift of circulating pump is obtained using the inlet and outlet pressure difference of current electrode, and the current electrode real-time flow is solved and corrected by combining pump lift-flow characteristic equation;The current electrode real-time flow and target flow after correction are input into PID controller, and the current electrode circulating pump speed is output;The outlet pressure of current positive and negative circulating pump is taken to calculate pressure difference, and the pressure difference and preset target pressure difference are input into PID controller, and the pump speed adjustment amount is output and corrected, and the positive and negative circulating pump speed is output.The method solves the problem of high cost and low reliability of special sensors caused by direct measurement of flow and viscosity in traditional technical solutions.

Description

Technical Field

[0001] This invention relates to the field of flow battery technology, and in particular to a flow battery pump cooperative control method and system based on parameter soft measurement. Background Technology

[0002] Flow batteries (such as vanadium redox flow batteries) have become one of the preferred technologies in large-scale energy storage due to their advantages such as power-capacity decoupling, long cycle life, and high safety. In a flow battery system, the positive and negative electrolytes circulate between the storage tank and the stack through a pumping system. The control performance of the circulating pump directly determines the system's performance, stability, and lifespan.

[0003] Currently, the control strategies for flow battery circulating pumps mainly fall into two categories: one is simple feedforward control based on charging power; the other is PID control that incorporates feedback from the circulating pump outlet pressure. These methods ensure system operation to a certain extent, but they have significant drawbacks:

[0004] Differences in physical properties: Due to differences in the types, valence states, and concentrations of active ions, the physical properties (especially viscosity) of the positive and negative electrode electrolytes differ significantly. Existing control methods assume that the positive and negative electrode circulation pumps provide the same flow rate at the same rotation speed, leading to uneven supply of reactants in reality, exacerbating concentration polarization, and reducing system efficiency.

[0005] Uncompensated temperature effect: The viscosity of the electrolyte is highly sensitive to temperature. Existing technology lacks active compensation for temperature changes, which leads to a decrease in control accuracy when operating conditions change, and the flow supply may be excessive or insufficient.

[0006] Tight control coupling: Traditional pressure PID control directly adjusts the pump speed, which may sacrifice the precise flow rate required for the reaction in pursuit of pressure balance, and fails to decouple the flow rate requirement from the pressure control.

[0007] Sensor Dependence and Cost: Achieving precise flow control typically requires the installation of flow sensors, which not only increases system cost and complexity but also presents reliability challenges in highly corrosive electrolyte environments. Flow sensors also have a high failure rate and require regular calibration, increasing the system maintenance burden.

[0008] Existing technologies also attempt to use open-loop control to estimate flow rate by relying solely on the speed of the circulating pump. However, due to factors such as changes in electrolyte viscosity, changes in system resistance characteristics, and the degradation of the pump's own performance, this method has very poor accuracy and cannot meet the requirements of high-performance control.

[0009] In summary, there is an urgent need for a low-cost, high-reliability pump control method that can accurately compensate for changes in electrolyte properties while avoiding the use of expensive viscosity sensors. Summary of the Invention

[0010] To address the shortcomings of the prior art, this invention provides a method and system for coordinated control of a flow battery pump based on parameter soft measurement. The method solves the problem of high cost and low reliability of dedicated sensors caused by the need for direct measurement of flow rate and viscosity in traditional technical solutions.

[0011] In a first aspect, the present invention provides a method for coordinated control of a flow battery pump based on parameter soft measurement, comprising:

[0012] S1: Real-time acquisition of measurement data of the flow battery; including the positive electrode electrolyte temperature, negative electrode electrolyte temperature, positive electrode circulation pump inlet pressure, positive electrode circulation pump outlet pressure, negative electrode circulation pump inlet pressure, negative electrode circulation pump outlet pressure, charge and discharge power, and battery state of charge.

[0013] S2: Based on the battery's electrode electrolyte temperature and battery state of charge, the real-time viscosity values ​​of the positive and negative electrode electrolytes are calculated using a soft viscosity measurement model.

[0014] S3: Calculate and obtain the target flow rates of the positive and negative electrodes based on the charging and discharging power and the real-time viscosity values ​​of the positive and negative electrode electrolytes, respectively;

[0015] S4: Obtain the actual head of the circulating pump by using the pressure difference between the inlet and outlet of the current electrode circulating pump, and solve the current electrode real-time flow rate by combining the pump head-flow characteristic equation and then correct it to obtain the corrected current electrode real-time flow rate.

[0016] S5: Input the corrected current electrode real-time flow rate and target flow rate into the PID controller, and output the current electrode circulation pump speed;

[0017] S6: Obtain the current outlet pressure of the positive and negative circulating pumps, calculate the pressure difference, input the pressure difference and the preset target pressure difference into the PID controller, and output the pump speed adjustment amount;

[0018] S7: Adjust the positive and negative electrode circulation pump speeds obtained from S5 and the pump speed adjustment amount obtained from S6 to output the positive and negative electrode circulation pump speeds.

[0019] Furthermore, the expression for the viscosity soft measurement model is:

[0020] ;

[0021] in, This is the real-time viscosity value of the current electrode electrolyte; This is a viscosity reference value; Temperature at the reference point; This is the battery reference state of charge. The temperature compensation coefficient is [value], and the temperature compensation coefficient of the positive electrode is [value]. The temperature compensation coefficient of the negative electrode is ; The SOC compensation coefficient is the positive electrode SOC compensation coefficient. The negative electrode SOC compensation coefficient is ; This represents the electrolyte temperature at the current electrode of the flow battery. The state of charge (SOC) of the battery is measured.

[0022] Preferably, in applications where high precision is not required, the effect of SOC on viscosity can be ignored, and a simplified model can be used. It can still achieve better results than traditional methods.

[0023] Furthermore, the formula for calculating the target flow rate of the electrode is:

[0024] ;

[0025] in, The target flow rate for the electrode; Power-flow coefficient; This refers to the charging and discharging power. This represents the real-time viscosity value of the electrode electrolyte. Reference viscosity value; This is the viscosity compensation index.

[0026] Furthermore, in step S4, the expression for obtaining the actual pump head using the inlet and outlet pressure difference of the current electrode circulation pump is:

[0027] ;

[0028] in, For Yang Cheng; This is the current outlet pressure of the circulating pump for the electrode; This is the inlet pressure of the circulating pump for the current electrode; The electrolyte density; This is the acceleration due to gravity.

[0029] Furthermore, the pump head-flow characteristic equation is specifically as follows:

[0030] ;

[0031] in, For Yang Cheng; The flow rate corresponding to the head; These are all performance parameters of the pump.

[0032] Preferably, the flow rate can also be obtained by looking up the head H-flow rate Q curve data of the circulating pump using a table lookup method, and then calculating the flow rate using an interpolation method.

[0033] Furthermore, in step S4, the process of obtaining the corrected current real-time flow rate of the electrode specifically involves:

[0034] ;

[0035] in, This is the corrected real-time flow rate of the current electrode; The real-time flow rate (initial value) is obtained by solving the head-flow characteristic equation. This represents the current rotational speed of the electrode circulation pump; This is the rated speed of the circulating pump; This is the real-time viscosity value of the electrolyte at the current electrode of the battery; This is a reference viscosity.

[0036] Furthermore, the formula for adjusting the circulation pump speed of the positive electrode in S7 is:

[0037] ;

[0038] in, To adjust the circulation pump speed of the positive electrode; To adjust the circulation pump speed at the positive electrode; This refers to the pump speed adjustment amount; This is the pump speed limit value;

[0039] The formula for adjusting the circulation pump speed at the negative electrode is:

[0040] ;

[0041] in, To adjust the circulation pump speed of the positive electrode; To adjust the circulation pump speed of the positive electrode.

[0042] Secondly, the present invention provides a flow battery pump collaborative control system based on parameter soft measurement, comprising:

[0043] Data acquisition module: used to acquire measurement data of flow battery in real time; the measurement data includes positive electrode electrolyte temperature, negative electrode electrolyte temperature, positive electrode circulation pump inlet pressure, positive electrode circulation pump outlet pressure, negative electrode circulation pump inlet pressure, negative electrode circulation pump outlet pressure, charge and discharge power, and battery state of charge.

[0044] Viscosity acquisition module: Based on the battery's electrode electrolyte temperature and battery state of charge, and combined with a viscosity soft measurement model, calculates and obtains the real-time viscosity values ​​of the positive and negative electrode electrolytes.

[0045] Target flow calculation module: used to calculate and obtain the target flow rates of the positive and negative electrodes based on the charging and discharging power and the real-time viscosity values ​​of the positive and negative electrode electrolytes, respectively;

[0046] Real-time flow acquisition module: Used to obtain the actual head of the pump by utilizing the pressure difference between the inlet and outlet of the current electrode circulation pump, and to solve the current electrode real-time flow by combining the pump head-flow characteristic equation and then correcting it to obtain the corrected current electrode real-time flow.

[0047] Pump speed acquisition module: used to input the corrected real-time flow rate and target flow rate of the current electrode into the PID controller and output the current circulating pump speed of the current electrode; used to acquire the outlet pressure of the current positive and negative circulating pumps, calculate the pressure difference, input the pressure difference and the preset target pressure difference into the PID controller, and output the circulating pump speed adjustment amount; used to adjust the positive and negative circulating pump speeds obtained from S5 and the circulating pump speed adjustment amount obtained from S6, and output the circulating pump speed output of the positive and negative electrodes.

[0048] This invention proposes a collaborative control method and system for a flow battery pump based on parameter soft measurement. The method does not rely on direct viscosity measurement sensors and flow sensors. Instead, it indirectly calculates the viscosity by utilizing the existing pressure, temperature, and SOC signals in the flow battery and obtains the flow rate by combining the head-flow equation. This enables precise, collaborative, and adaptive control of the positive and negative electrode circulating pumps, significantly reducing costs while improving system operating efficiency and reliability. Attached Figure Description

[0049] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0050] Figure 1 This is a block diagram of the hardware system structure of the flow battery provided in the embodiments of the present invention;

[0051] Figure 2 This is a flowchart illustrating a collaborative control method for a flow battery pump based on parameter soft measurement provided in an embodiment of the present invention.

[0052] In the diagram: 101 - Electrolyte stack; 102 - Positive electrolyte storage tank; 103 - Negative electrolyte storage tank; 104 - Positive circulation pump; 105 - Negative circulation pump; 201 - Positive temperature sensor; 202 - Negative temperature sensor; 203 - Positive circulation pump inlet pressure sensor; 204 - Positive circulation pump outlet pressure sensor; 205 - Negative circulation pump inlet pressure sensor; 206 - Negative circulation pump outlet pressure sensor; 300 - Controller; 301 - Viscosity calculation unit; 302 - Target flow calculation unit; 303 - Flow calculation unit; 304 - Pressure balance control unit; 401 - Positive circulation pump frequency converter; 402 - Negative circulation pump frequency converter. Detailed Implementation

[0053] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be described in detail below. Obviously, the described embodiments are merely some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0054] The present invention is based on, for example Figure 1 The hardware system shown is a standard configuration for a flow battery system, requiring no additional dedicated viscosity and flow sensors. The hardware system includes:

[0055] The main body of the flow battery system includes a stack 101, a positive electrolyte storage tank 102, a negative electrolyte storage tank 103, a positive circulation pump 104, a negative circulation pump 105, and connecting pipelines.

[0056] The circulating pump unit (not shown in the figure) is equipped with a magnetic pump or other corrosion-resistant pump in both the positive and negative circuits. It is driven by a frequency converter and can achieve precise speed control.

[0057] Sensor group: Includes multiple temperature sensors, including positive electrode temperature sensor 201, negative electrode temperature sensor 202, positive electrode circulation pump inlet pressure sensor 203, positive electrode circulation pump outlet pressure sensor 204, negative electrode circulation pump inlet pressure sensor 205, and negative electrode circulation pump outlet pressure sensor 206. Special note: Flow sensors and viscosity sensors are not included. These are installed in the positive and negative electrode circulation pipelines or storage tanks respectively to measure the electrolyte temperature. , Multiple pressure sensors: installed at the inlet and outlet of the positive and negative circulating pumps respectively, for measuring pressure ( , , , Multiple current and voltage sensors are used to measure the system's charging and discharging current and voltage, thereby calculating the power (PWR) and state of charge (SOC).

[0058] Controller 300: A flow battery circulating pump collaborative control system (BMS) based on parameter soft measurement, which internally embeds software function blocks such as the viscosity calculation unit 301, target flow calculation unit 302, flow calculation unit 303, and pressure balance control unit 304 of this invention. This controller needs to have sufficient computing power and I / O interfaces to process sensor signals and output control commands.

[0059] Actuators: include positive circulating pump frequency converter 401 and negative circulating pump frequency converter 402.

[0060] Example 1

[0061] like Figure 1 As shown, this invention provides a collaborative control method for a flow battery pump based on parameter soft measurement, comprising:

[0062] S1: Real-time acquisition of measurement data of the flow battery; the measurement data includes the positive electrode electrolyte temperature, negative electrode electrolyte temperature, positive electrode circulation pump inlet pressure, positive electrode circulation pump outlet pressure, negative electrode circulation pump inlet pressure, negative electrode circulation pump outlet pressure, charge and discharge power, and battery state of charge.

[0063] S2: Based on the battery's electrode electrolyte temperature and battery state of charge, the real-time viscosity values ​​of the positive and negative electrode electrolytes are calculated using a soft viscosity measurement model.

[0064] Furthermore, the expression for the viscosity soft measurement model is:

[0065] ;

[0066] in, This is the real-time viscosity value of the current electrode electrolyte; Reference viscosity; For reference temperature; This is the battery reference state of charge. Here, the temperature compensation coefficient is, where the positive electrode temperature compensation coefficient is... The negative electrode temperature compensation coefficient is ; Here, SOC compensation coefficient is given, where the positive electrode SOC compensation coefficient is... The negative electrode SOC compensation coefficient is ; This represents the electrolyte temperature at the current electrode of the flow battery. The state of charge (SOC) of the battery is measured.

[0067] Instead of directly measuring viscosity using a viscosity sensor, this method avoids the high costs associated with corrosion of viscosity sensors in highly corrosive electrolyte environments. By establishing a quantitative relationship model between viscosity, temperature (linear factor), and state of charge (SOC, nonlinear quadratic factor), a soft viscosity measurement model is created. The battery SOC is used as a key input parameter for viscosity calculation, capturing the dynamic changes in electrolyte properties during the electrochemical reaction process and providing crucial input for flow control.

[0068] S3: Calculate and obtain the target flow rates of the positive and negative electrodes based on the charging and discharging power and the real-time viscosity values ​​of the positive and negative electrode electrolytes, respectively;

[0069] Furthermore, the formula for calculating the target flow rate of the electrode is:

[0070] ;

[0071] in, The target flow rate for the electrode; Power-flow coefficient; This refers to the charging and discharging power. This represents the real-time viscosity value of the electrode electrolyte. This is the viscosity reference value; This is the viscosity compensation index.

[0072] S4: Obtain the actual head of the pump by using the pressure difference between the inlet and outlet of the current electrode circulation pump, and solve the current electrode real-time flow rate by combining the pump head-flow characteristic equation and then correct it to obtain the corrected current electrode real-time flow rate.

[0073] Furthermore, in step S4, the expression for obtaining the actual pump head using the inlet and outlet pressure difference of the current electrode circulation pump is:

[0074] ;

[0075] in, For Yang Cheng; This represents the current outlet pressure of the electrode; This represents the current inlet pressure of the electrode; The electrolyte density; This is the acceleration due to gravity.

[0076] Using the pump itself as a measuring element, the pump head is obtained by the pump speed N and the pressure difference formed by a single electrode. Then, based on the head-flow characteristic curve, which conforms to the pump head-flow characteristic equation, the actual flow rate of a single electrode is calculated in reverse.

[0077] Furthermore, the pump head-flow characteristic equation is specifically as follows:

[0078] ;

[0079] in, For Yang Cheng; The flow rate corresponding to the head; These are all performance parameters of the pump.

[0080] Preferably, the flow rate can also be obtained by looking up the head H-flow rate Q curve data of the circulating pump using a table lookup method, and by estimating the flow rate using an interpolation method.

[0081] Furthermore, the expression for obtaining the corrected real-time flow rate of the current electrode is:

[0082] ;

[0083] in, This is the corrected real-time flow rate of the current electrode; The real-time flow rate (initial value) is obtained by solving the head-flow characteristic equation. This represents the current rotational speed of the electrode circulation pump; This is the rated speed of the circulating pump; This is the real-time viscosity value of the electrolyte at the current electrode of the battery; This is a reference viscosity.

[0084] By introducing reference values ​​for rotational speed and viscosity to correct the calculated flow rate, the accuracy of the calculated flow rate is improved. Furthermore, by eliminating the physical flow meter, the basic flow rates of the positive and negative electrodes are calculated independently based on the charging and discharging power and viscosity, thus solving the problem of material property differences and realizing closed-loop flow control, breaking the constraint of poor accuracy in open-loop control.

[0085] S5: Input the corrected current electrode real-time flow rate and target flow rate into the PID controller, and output the current electrode circulation pump speed;

[0086] S6: Obtain the current outlet pressure of the positive and negative circulation pumps and calculate the pressure difference. The pressure difference and the preset target pressure difference are input to the PID controller, and the output is the circulation pump speed adjustment amount;

[0087] S7: Adjust the positive and negative circulating pump speeds obtained from S5 and the circulating pump speed adjustment amount obtained from S6, and output the positive and negative circulating pump speeds.

[0088] Furthermore, the formula for adjusting the circulation pump speed of the positive electrode in S7 is:

[0089] ;

[0090] in, To adjust the circulation pump speed of the positive electrode; To adjust the circulation pump speed at the positive electrode; This refers to the pump speed adjustment amount; This is the pump speed limit. When the pressure difference is positive, reduce the positive electrode circulation pump speed.

[0091] The formula for adjusting the circulation pump speed at the negative electrode is:

[0092] ;

[0093] in, To adjust the circulation pump speed of the positive electrode; To adjust the circulation pump speed at the positive electrode. When the pressure difference is positive, increase the circulation pump speed at the negative electrode.

[0094] To prevent pressure imbalance between the positive and negative electrodes from tearing or perforating the diaphragm and causing internal leakage in the fuel cell stack, the pressure of the positive and negative electrodes is balanced by adjusting the circulating pump speed. This resolves the contradiction in traditional PID control where pressure is sacrificed at the expense of flow rate, or vice versa, achieving coordinated optimization of flow rate demand and pressure safety.

[0095] Compared with the prior art, the present invention has the following advantages:

[0096] (1) Significantly reduced costs: It completely eliminates the need for expensive online viscosity and flow sensors, and uses existing sensors to achieve the same function, thus reducing system hardware costs and subsequent maintenance costs.

[0097] (2) Improved reliability: Temperature sensors and SOC calculations are more stable and reliable than online viscometers and flow meters, reducing potential failure points in the system.

[0098] (3) High control precision: The viscosity changes with temperature and SOC through a soft measurement model, and closed-loop control is achieved by combining flow estimation, which effectively alleviates polarization and improves system energy efficiency.

[0099] (4) Strong adaptability: The flow estimation model can automatically compensate for pump performance degradation and system resistance changes, maintaining long-term control accuracy.

[0100] (5) High practicality: The method is simple and reliable, and it is easy to implement in the existing flow battery control system through software upgrades. It is easy to promote industrialization.

[0101] Example 2

[0102] This embodiment provides a flow battery pump collaborative control system based on parameter soft measurement, including:

[0103] Data acquisition module: used to acquire measurement data of flow battery in real time; the measurement data includes positive electrode electrolyte temperature, negative electrode electrolyte temperature, positive electrode circulation pump inlet pressure, positive electrode circulation pump outlet pressure, negative electrode circulation pump inlet pressure, negative electrode circulation pump outlet pressure, charge and discharge power, and battery state of charge.

[0104] In practice, the data acquisition module reads the raw data from all sensors (positive electrolyte temperature). Negative electrode electrolyte temperature Positive circulation pump inlet pressure The positive electrode circulation pump outlet pressure Negative circulation pump inlet pressure The outlet pressure of the negative electrode circulating pump Current ,Voltage ), and perform filtering and validity checks. Based on the current and voltage Real-time SOC calculation based on integral; according to current and voltage Calculate real-time power (PWR).

[0105] Preferably, the process includes preliminary preparation and parameter calibration before data acquisition. This is crucial for ensuring control accuracy and is completed in the early stages of system debugging. Specifically:

[0106] Pump characteristic curve calibration: Obtain the head-flow (HQ) curve provided by the pump manufacturer. After system installation, temporarily install a high-precision flow meter. Run the pump at different speeds and record the speed (HQ). ), the inlet and outlet pressure difference of a single electrode ( ) and actual flow ( Using the recorded data, the pump characteristic equation was fitted. The coefficients a, b, and c in the equation. The positive and negative circulation pumps need to be calibrated separately.

[0107] Viscosity model parameter calibration: Under laboratory conditions, the actual viscosity values ​​of the electrolyte used were measured using a viscometer at different temperatures (not limited, e.g., 10°C, 20°C, 30°C, 40°C) and different SOCs (not limited, e.g., 20%, 50%, 80%, 100%). A soft-sensing viscosity model was fitted using the experimental data. The temperature compensation coefficients for the positive and negative electrodes in the soft-sensing viscosity model adopted different coefficient sets (…). , , , Perform independent calculations.

[0108] Viscosity acquisition module: Based on the battery's electrode electrolyte temperature and battery state of charge, and combined with a viscosity soft measurement model, it calculates and obtains the real-time viscosity values ​​of the positive and negative electrode electrolytes.

[0109] In practice, the FB_ViscosityEstimator function block is called to collect real-time data. , Substituting the SOC and calibrated parameters into the model, the real-time viscosity, including the real-time viscosity of the cathode, is calculated. Real-time viscosity of the negative electrode .

[0110] Target flow rate calculation module: This module calculates the target flow rate for both the positive and negative electrodes based on the charging / discharging power and the real-time viscosity values ​​of the positive and negative electrolytes. In specific implementation, it is based on the current... and Using the formula Calculate the target flow rates for both positive and negative poles.

[0111] Real-time flow acquisition module: Used to obtain the actual head of the pump by utilizing the pressure difference between the inlet and outlet of the current electrode circulating pump, and then solve the pump head-flow characteristic equation to obtain the real-time flow of the current electrode and make corrections to obtain the corrected real-time flow of the current electrode.

[0112] In practice, the FB_FlowEstimator function block is called to set the current pump speed. Inlet and outlet pressures of a single electrode , ) and real-time viscosity ( Input. This function block internally calculates the head. And solve the pump characteristic equation. Get the current real-time traffic According to the formula Adjusting Q yields the final estimated actual flow rate. .

[0113] Pump speed acquisition module: used to input the corrected real-time flow rate and target flow rate of the current electrode into the PID controller and output the current electrode's circulating pump speed; used to acquire the outlet pressure of the current positive and negative circulating pumps, calculate the pressure difference, input the pressure difference and the preset target pressure into the PID controller, and output the pump speed adjustment amount; used to adjust the positive and negative circulating pump speeds based on the pump speed adjustment amount obtained in S5 and S6, and output the positive and negative circulating pump speeds.

[0114] In practice, based on the target traffic and real-time traffic The deviation is initially calculated using a PI controller to determine the base pump speed. Calculate the outlet pressure difference between the positive and negative electrode circulating pumps. Call the PID_Compact function block to... As input, generate a pressure regulation value. (The output range is typically -100% to +100%). A decoupling method is used to synthesize the final speed command to simultaneously meet flow and pressure requirements.

[0115] (When the pressure difference is positive, reduce the positive electrode circulation pump speed).

[0116] (When the pressure difference is positive, increase the speed of the negative electrode circulation pump).

[0117] In addition, it also applies to and Amplitude limiting is then applied. Finally, the command is output to the actuator to drive the circulating pump.

[0118] It is understood that the same or similar parts in the above embodiments can be referred to each other, and the contents not described in detail in some embodiments can be referred to the same or similar contents in other embodiments.

[0119] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A method for coordinated control of a flow battery pump based on parameter soft measurement, characterized in that, include: S1: Real-time acquisition of measurement data of the flow battery; including the positive electrode electrolyte temperature, negative electrode electrolyte temperature, positive electrode circulation pump inlet pressure, positive electrode circulation pump outlet pressure, negative electrode circulation pump inlet pressure, negative electrode circulation pump outlet pressure, charge and discharge power, and battery state of charge. S2: Based on the battery's electrolyte temperature and state of charge, the real-time viscosity values ​​of the positive and negative electrode electrolytes are calculated using a viscosity soft-sensing model; wherein, the expression for the viscosity soft-sensing model is: ； in, This is the real-time viscosity value of the current electrode electrolyte; Reference viscosity; For reference temperature; This is the battery reference state of charge. Here is the temperature compensation coefficient; the positive electrode temperature compensation coefficient is... The negative electrode temperature compensation coefficient is ; The SOC compensation coefficient is the positive electrode SOC compensation coefficient. The negative electrode SOC compensation coefficient is ; This represents the electrolyte temperature at the current electrode of the flow battery. The state of charge (SOC) of the battery is measured. S3: Calculate the target flow rates of the positive and negative electrodes based on the charging / discharging power and the real-time viscosity values ​​of the positive and negative electrode electrolytes, respectively; the formula for calculating the target electrode flow rate is as follows: ； in, The target flow rate for the electrode; Power-flow coefficient; This refers to the charging and discharging power. This represents the real-time viscosity value of the electrode electrolyte. Reference viscosity; It is the viscosity compensation index; S4: Obtain the actual head of the current electrode circulating pump using the inlet and outlet pressure difference. Solve the pump head-flow characteristic equation to obtain the real-time flow rate of the current electrode, and then correct it to obtain the corrected real-time flow rate of the current electrode. The expression for obtaining the actual head of the circulating pump using the inlet and outlet pressure difference of the current electrode is as follows: ； in, For Yangcheng; This is the current outlet pressure of the electrode circulation pump; This is the current inlet pressure of the electrode circulation pump; The electrolyte density; It is the acceleration due to gravity; S5: Input the corrected current real-time flow rate and target flow rate of the electrode into the PID controller, and output the current electrode circulating pump speed; S6: Obtain the current outlet pressure of the positive and negative circulating pumps, calculate the pressure difference, input the pressure difference and the preset target pressure difference into the PID controller, and output the pump speed adjustment amount; S7: Adjust the pump speed of the positive and negative circulating pumps obtained from S5 and the pump speed adjustment amount obtained from S6, and output the pump speed of the positive and negative circulating pumps.

2. The method according to claim 1, characterized in that, The pump head-flow characteristic equation is specifically as follows: ； in, For Yangcheng; The flow rate corresponding to the head; These are all performance parameters of the pump.

3. The method according to claim 1, characterized in that, In step S4, the process of obtaining the corrected real-time flow rate of the current electrode is as follows: ； in, This is the corrected real-time flow rate of the current electrode; The estimated flow rate is obtained by solving the head-flow characteristic equation; This represents the current rotational speed of the circulating pump; This is the rated speed of the circulating pump; This is the real-time viscosity value of the electrolyte at the current electrode of the battery; This is a reference viscosity value.

4. The method according to claim 1, characterized in that, The formula for adjusting the circulation pump speed of the positive electrode in S7 is: ； in, To adjust the circulation pump speed of the positive electrode; To adjust the circulation pump speed at the positive electrode; This refers to the pump speed adjustment amount; This is the pump speed limit value; The formula for adjusting the circulation pump speed at the negative electrode is: ； in, To adjust the circulation pump speed of the positive electrode; To adjust the circulation pump speed of the positive electrode.

5. A flow battery pump cooperative control system based on parameter soft measurement, said system being used to execute the method as described in any one of claims 1-4, characterized in that, include: Data acquisition module: used to acquire measurement data of flow battery in real time; the measurement data includes positive electrode electrolyte temperature, negative electrode electrolyte temperature, positive electrode circulation pump inlet pressure, positive electrode circulation pump outlet pressure, negative electrode circulation pump inlet pressure, negative electrode circulation pump outlet pressure, charge and discharge power, and battery state of charge. Viscosity acquisition module: Based on the battery's electrode electrolyte temperature and battery state of charge, and combined with a viscosity soft measurement model, calculates and obtains the real-time viscosity values ​​of the positive and negative electrode electrolytes. Target flow calculation module: used to calculate and obtain the target flow rates of the positive and negative electrodes based on the charging and discharging power and the real-time viscosity values ​​of the positive and negative electrode electrolytes, respectively; Real-time flow acquisition module: Used to obtain the actual head of the pump by utilizing the pressure difference between the inlet and outlet of the circulating pump of the current electrode, and to obtain the real-time flow of the current electrode by solving the pump head-flow characteristic equation and correcting it to obtain the corrected real-time flow of the current electrode. Pump speed acquisition module: used to input the corrected real-time flow rate and target flow rate of the current electrode into the PID controller and output the current electrode circulation pump speed; used to acquire the outlet pressure of the current positive and negative circulation pumps, calculate the pressure difference, input the pressure difference and the preset target pressure difference into the PID controller, and output the pump speed adjustment amount; used to adjust the positive and negative circulation pump speeds obtained from S5 and the pump speed adjustment amount obtained from S6, and output the positive and negative circulation pump speeds.

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