CN118398857B - Control method and device of flow battery system - Google Patents
Control method and device of flow battery system Download PDFInfo
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- CN118398857B CN118398857B CN202410841628.8A CN202410841628A CN118398857B CN 118398857 B CN118398857 B CN 118398857B CN 202410841628 A CN202410841628 A CN 202410841628A CN 118398857 B CN118398857 B CN 118398857B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The embodiment of the invention discloses a control method and a control device of a flow battery system. The control method comprises the following steps: acquiring open circuit voltage, positive and negative electrode flow and positive and negative electrode pressure of a flow battery system; determining the state of charge of the flow battery system according to the open-circuit voltage and a fitting curve of the open-circuit voltage and the state of charge, and determining a target flow according to the state of charge; and determining the frequency increment of the positive frequency converter and the frequency increment of the negative frequency converter in the flow battery system according to the target flow, the positive and negative flow and the positive and negative pressure so as to regulate the flow and the pressure of the flow battery system. The control method and the device of the flow battery system provided by the embodiment of the invention can ensure the working reliability of the system.
Description
Technical Field
The embodiment of the invention relates to a battery control technology, in particular to a control method and device of a flow battery system.
Background
In flow battery systems, electrolyte is transported to a stack and ions move through an exchange membrane to complete an electrochemical reaction. In order to ensure the progress of the electrochemical reaction, it is necessary that the electrolyte reaches a certain flow rate. Therefore, when the flow battery system is operated, the flow battery system needs to be reliably controlled so as to adjust the flow of the flow battery system and ensure the reliable operation of the system.
At present, the existing control method of the flow battery system generally adjusts the real-time flow only according to the positive and negative flow of the flow battery system, so as to influence the working reliability of the system.
Disclosure of Invention
The embodiment of the invention provides a control method and a control device of a flow battery system, which are used for ensuring the working reliability of the system.
In a first aspect, an embodiment of the present invention provides a control method of a flow battery system, including:
acquiring open circuit voltage, positive and negative electrode flow and positive and negative electrode pressure of a flow battery system;
Determining the state of charge of the flow battery system according to the open-circuit voltage and a fitting curve of the open-circuit voltage and the state of charge, and determining a target flow according to the state of charge;
And determining the frequency increment of the positive frequency converter and the frequency increment of the negative frequency converter in the flow battery system according to the target flow, the positive and negative flow and the positive and negative pressure so as to regulate the flow and the pressure of the flow battery system.
Optionally, the determining, according to the target flow, the positive and negative electrode flow, and the positive and negative electrode pressure, a frequency increment of a positive frequency converter and a frequency increment of a negative frequency converter in the flow battery system includes:
determining a flow error and a pressure error according to the target flow, the anode and cathode flow and the anode and cathode pressure;
according to the flow error and the pressure error, table lookup is performed to determine each preset control parameter;
And determining the frequency increment of the positive frequency converter and the frequency increment of the negative frequency converter in the flow battery system according to the preset control parameters, the flow error and the pressure error.
Optionally, the determining, according to the preset control parameter, the flow error and the pressure error, a frequency increment of a positive frequency converter and a frequency increment of a negative frequency converter in the flow battery system includes:
If the absolute value of the pressure error is larger than a preset first pressure threshold value, determining the frequency increment of pressure regulation according to the pressure error;
If the absolute value of the pressure error is smaller than a preset second pressure threshold value and the frequency of the positive frequency converter and the frequency of the negative frequency converter in the flow battery system are not zero, determining the frequency increment of flow regulation according to the flow error; the preset first pressure threshold is greater than the preset second pressure threshold;
And if the absolute value of the pressure error is smaller than or equal to the preset first pressure threshold value and larger than or equal to the preset second pressure threshold value, determining the frequency increment of pressure regulation according to the pressure error, and determining the frequency increment of flow regulation according to the flow error.
Optionally, the determining the frequency increment of the pressure adjustment according to the pressure error and determining the frequency increment of the flow adjustment according to the flow error includes:
The pressure error is brought into a preset pressure formula to obtain a frequency increment Deltau p (n) of pressure regulation, and the flow error is brought into a preset flow formula to obtain a frequency increment Deltau q (n) of flow regulation;
If the frequency of the positive frequency converter and the frequency of the negative frequency converter are not zero and the positive flow is smaller than the negative flow, determining the frequency u Positive direction （n）= u Positive direction （n-1）+Δuq (n) of the positive frequency converter and the frequency u Negative pole （n）= u Negative pole （n-1）*（u Positive direction （n-1）+Δuq（n））/ u Positive direction （n-1）+Δup (n) of the negative frequency converter;
If the frequency of the positive frequency converter and the frequency of the negative frequency converter are not zero and the positive flow is greater than or equal to the negative flow, determining the frequency u Positive direction （n）= u Positive direction （n-1）*（u Negative pole （n-1）+Δuq（n））/ u Negative pole (n-1) of the positive frequency converter and the frequency u Negative pole （n）= u Negative pole （n-1）+Δuq（n）+Δup (n) of the negative frequency converter.
Optionally, the determining the frequency increment of the pressure adjustment according to the pressure error and determining the frequency increment of the flow adjustment according to the flow error includes:
The pressure error is brought into a preset pressure formula to obtain a frequency increment Deltau p (n) of pressure regulation, and the flow error is brought into a preset flow formula to obtain a frequency increment Deltau q (n) of flow regulation;
If the frequency of the positive frequency converter and/or the frequency of the negative frequency converter is zero, determining the frequency u Positive direction （n）= u Positive direction （n-1）+Δuq (n) of the positive frequency converter and the frequency u Negative pole （n）= u Negative pole （n-1）+Δuq（n）+Δup (n) of the negative frequency converter.
Optionally, the determining the flow error and the pressure error according to the target flow, the positive and negative electrode flow and the positive and negative electrode pressure includes:
If the positive flow is smaller than the negative flow, determining that the flow error is the difference value between the target flow and the positive flow;
If the positive flow is greater than or equal to the negative flow, determining that the flow error is the difference value between the target flow and the negative flow;
and taking the difference value of the positive electrode pressure and the negative electrode pressure as the pressure error.
Optionally, the determining the target flow according to the state of charge includes:
And determining the target flow according to the state of charge table.
Optionally, the flow and pressure are related to the frequency increment.
In a second aspect, an embodiment of the present invention provides a control device of a flow battery system, including:
the parameter acquisition module is used for acquiring the open-circuit voltage, the positive and negative electrode flow and the positive and negative electrode pressure of the flow battery system;
The flow determining module is used for determining the state of charge of the flow battery system according to the open circuit voltage and a fitting curve of the open circuit voltage and the state of charge, and determining a target flow according to the state of charge;
And the increment determining module is used for determining the frequency increment of the positive frequency converter and the frequency increment of the negative frequency converter in the flow battery system according to the target flow, the positive and negative flow and the positive and negative pressure so as to regulate the flow and the pressure of the flow battery system.
Optionally, the increment determining module includes:
the error determining unit is used for determining flow errors and pressure errors according to the target flow, the positive and negative electrode flow and the positive and negative extreme pressure;
The parameter determining unit is used for determining each preset control parameter by looking up a table according to the flow error and the pressure error;
And the increment determining unit is used for determining the frequency increment of the positive frequency converter and the frequency increment of the negative frequency converter in the flow battery system according to the preset control parameter, the flow error and the pressure error.
The control method and device of the flow battery system provided by the embodiment of the invention comprise the following steps: acquiring open circuit voltage, positive and negative electrode flow and positive and negative electrode pressure of a flow battery system; determining the state of charge of the flow battery system according to the open-circuit voltage and a fitting curve of the open-circuit voltage and the state of charge, and determining a target flow according to the state of charge; and determining the frequency increment of the positive frequency converter and the frequency increment of the negative frequency converter in the flow battery system according to the target flow, the positive and negative flow and the positive and negative pressure so as to regulate the flow and the pressure of the flow battery system. According to the control method and the control device for the flow battery system, the frequency increment of the positive electrode frequency converter and the frequency increment of the negative electrode frequency converter in the flow battery system are determined according to the target flow, the positive electrode flow and the negative electrode pressure, so that the flow and the pressure of the flow battery system are regulated, the flow and the pressure are regulated in combination, the situation that the service life of an exchange membrane is reduced or even damaged due to the fact that the pressure difference at two sides of the exchange membrane in the system is too large due to the fact that the pressure is not considered in flow regulation is prevented, and the performance and the stability of the system are influenced due to the fact that electrolyte leaks or permeates into an area which should not be reached is avoided, and therefore the working reliability of the system is guaranteed.
Drawings
Fig. 1 is a flowchart of a control method of a flow battery system according to an embodiment of the present invention;
Fig. 2 is a flowchart of a control method of a flow battery system according to a second embodiment of the present invention;
Fig. 3 is a flowchart of another control method of a flow battery system according to the second embodiment of the present invention;
Fig. 4 is a block diagram of a control device of a flow battery system according to a third embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
Example 1
Fig. 1 is a flowchart of a control method of a flow battery system according to a first embodiment of the present invention, where the method may be applied to control pressure and flow rate of the flow battery system, and the method may be performed by a control device of the flow battery system, where the control device may be implemented in software and/or hardware, and the control device may be integrated in an electronic device, such as a computer, and the method specifically includes the following steps:
step 110, obtaining an open circuit voltage, an anode flow rate and an anode pressure of the flow battery system.
The flow battery system is provided with a voltage sensor, a flow sensor and a pressure sensor, and can respectively acquire the open-circuit voltage, the positive and negative electrode flow and the positive and negative electrode pressure of the flow battery system, and a control device of the flow battery system can be electrically connected with the voltage sensor, the flow sensor and the pressure sensor so as to acquire the open-circuit voltage, the positive and negative electrode flow (positive electrode flow and negative electrode flow) and the positive and negative electrode pressure (positive electrode pressure and negative electrode pressure) of the flow battery system.
Step 120, determining the state of charge of the flow battery system according to the open circuit voltage and the fitted curve of the open circuit voltage and the state of charge, and determining the target flow according to the state of charge.
Specifically, the state of charge corresponding to the open circuit voltage is determined in a fitted curve of the open circuit voltage and the state of charge, and the target flow is determined according to a table look-up of the state of charge, for example, a table with a corresponding relation between the state of charge and the target flow is provided, different states of charge in the table have respective corresponding values of the target flow, the table can be obtained in advance according to theoretical calculation and experiments, and the target flow corresponding to the state of charge is determined through the table look-up.
And 130, determining the frequency increment of the positive frequency converter and the frequency increment of the negative frequency converter in the flow battery system according to the target flow, the positive and negative flow and the positive and negative pressure so as to regulate the flow and the pressure of the flow battery system.
Specifically, if the positive flow is smaller than the negative flow, taking the difference between the target flow and the positive flow as a flow error, and taking the difference between the positive pressure and the negative pressure as a pressure error. According to the flow error and the pressure error, if the pressure error is brought into a preset pressure formula, and the flow error is brought into the preset flow formula, the frequency increment of the positive frequency converter and the frequency increment of the negative frequency converter in the flow battery system are determined, and therefore the flow and the pressure of the flow battery system are adjusted by adjusting the frequency of the positive frequency converter and the frequency of the negative frequency converter.
According to the control method of the flow battery system, the frequency increment of the positive electrode frequency converter and the frequency increment of the negative electrode frequency converter in the flow battery system are determined according to the target flow, the positive electrode flow and the negative electrode pressure, so that the flow and the pressure of the flow battery system are regulated, the flow and the pressure are regulated by combining the flow regulation, the situation that the service life of an exchange membrane is reduced or even damaged due to the fact that the pressure difference at two sides of the exchange membrane in the system is too large due to the fact that the pressure is not considered in flow regulation is prevented, and the performance and the stability of the system are influenced due to the fact that electrolyte leaks or permeates into an area which should not be reached is avoided, and therefore the working reliability of the system is guaranteed.
Example two
Fig. 2 is a flowchart of a control method of a flow battery system according to a second embodiment of the present invention, where the method may be applied to control pressure and flow rate of the flow battery system, and the method may be performed by a control device of the flow battery system, where the control device may be implemented in software and/or hardware, and the control device may be integrated in an electronic device, such as a computer, and the method specifically includes the following steps:
step 210, obtaining an open circuit voltage, an anode flow rate and an anode pressure of the flow battery system.
The flow battery system is provided with a voltage sensor, a flow sensor and a pressure sensor, and can respectively acquire the open-circuit voltage, the positive and negative electrode flow and the positive and negative electrode pressure of the flow battery system, and a control device of the flow battery system can be electrically connected with the voltage sensor, the flow sensor and the pressure sensor so as to acquire the open-circuit voltage, the positive and negative electrode flow (positive electrode flow and negative electrode flow) and the positive and negative electrode pressure (positive electrode pressure and negative electrode pressure) of the flow battery system.
Step 220, determining the state of charge of the flow battery system according to the open circuit voltage and the fitting curve of the open circuit voltage and the state of charge, and determining the target flow according to the state of charge.
Specifically, the state of charge corresponding to the open circuit voltage is determined in a fitted curve of the open circuit voltage and the state of charge, and the target flow is determined according to a table look-up of the state of charge, for example, a table with a corresponding relation between the state of charge and the target flow is provided, different states of charge in the table have respective corresponding values of the target flow, and the target flow corresponding to the state of charge is determined through the table look-up.
And 230, determining flow errors and pressure errors according to the target flow, the positive and negative electrode flow and the positive and negative electrode pressure.
Specifically, if the positive flow is smaller than the negative flow, determining the flow error as the difference between the target flow and the positive flow; if the positive flow is greater than or equal to the negative flow, determining the flow error as a difference value between the target flow and the negative flow, and taking the difference value between the positive pressure and the negative pressure as the pressure error.
Step 240, table look-up is performed to determine each preset control parameter according to the flow error and the pressure error.
Specifically, the preset control parameter k p-q、ki- q、kd-q of the flow is determined according to the flow error e q (n) at the current time and the flow error e q (n-1) at the last time by looking up a table, for example, a table corresponding to the flow error and the preset control parameter records the flow error e q (n) at the current time and the flow error e q (n-1) at the last time, and records a plurality of e q (n) with different values, each e q (n) has a corresponding e q (n-1) and a preset control parameter k p-q、ki- q、kd-q, and the table can be obtained in advance according to theoretical calculation and experiments, and the preset control parameter k p-p、ki-p、kd-p of the pressure is determined according to the pressure error e p (n) at the current time and the pressure error e p (n-1) at the last time by looking up a table.
Step 250, determining the frequency increment of the positive frequency converter and the frequency increment of the negative frequency converter in the flow battery system according to preset control parameters, flow errors and pressure errors.
Wherein flow and pressure are related to frequency increment. Specifically, if the absolute value of the pressure error is greater than a preset first pressure threshold, determining a frequency increment of pressure adjustment according to the pressure error; if the absolute value of the pressure error is smaller than a preset second pressure threshold value and the frequency of the positive frequency converter and the frequency of the negative frequency converter in the flow battery system are not zero, determining the frequency increment of flow regulation according to the flow error; the preset first pressure threshold value delta P1 is larger than the preset second pressure threshold value delta P2; if the absolute value of the pressure error is smaller than or equal to a preset first pressure threshold value and larger than or equal to a preset second pressure threshold value, determining the frequency increment of pressure regulation according to the pressure error, and determining the frequency increment of flow regulation according to the flow error. Illustratively, the pressure error is brought into a preset pressure formula to obtain a pressure-adjusted frequency increment Deltau p (n), and the flow error is brought into a preset flow formula to obtain a flow-adjusted frequency increment Deltau q (n); if the frequency of the positive frequency converter (the last time frequency u Positive direction (n-1)) and the frequency of the negative frequency converter (the last time frequency u Negative pole (n-1)) are not zero and the positive flow is smaller than the negative flow, determining the frequency u Positive direction （n）= u Positive direction （n-1）+Δuq (n) of the positive frequency converter, the frequency u Negative pole （n）= u Negative pole （n-1）*（u Positive direction （n-1）+Δuq（n））/ u Positive direction （n-1）+Δup (n) of the negative frequency converter; If the frequency of the positive frequency converter and the frequency of the negative frequency converter are not zero and the positive flow is greater than or equal to the negative flow, determining the frequency u Positive direction （n）= u Positive direction （n-1）*（u Negative pole （n-1）+Δuq（n））/ u Negative pole (n-1) of the positive frequency converter and the frequency u Negative pole （n）= u Negative pole （n-1）+Δuq（n）+Δup (n) of the negative frequency converter; if the frequency of the positive frequency converter and/or the frequency of the negative frequency converter is zero, the frequency u Positive direction （n）= u Positive direction （n-1）+Δuq (n) of the positive frequency converter and the frequency u Negative pole （n）= u Negative pole （n-1）+Δuq（n）+Δup (n) of the negative frequency converter are determined. Wherein, Preset pressure formula (incremental PID regulation) is up（n）= up（n-1）+kp-p（e p（n）- e p（n-1））+ ki-pe p（n）+ kd-p（e p（n）-2 e p（n-1）+ e p（n-2））,n or more and 2,Δup（n）= kp-p（e p（n）- e p（n-1））+ ki-pe p（n）+ kd-p（e p（n）-2 e p（n-1）+ e p（n-2））, or preset flow formula (incremental PID regulation) is uq（n）= uq（n-1）+kp-q（e q（n）- e q（n-1））+ ki-qe q（n）+ kd-q（e q（n）-2 e q（n-1）+ e q（n-2））,n or more 2,Δu q（n）= kp-q（e q（n）- e q（n-1））+ ki-qe q（n）+ kd-q（e q（n）-2 e q（n-1）+ e q（n-2））.
Fig. 3 is a flowchart of another control method of a flow battery system according to the second embodiment of the present invention. Referring to fig. 3, a specific adjustment procedure of the pressure adjustment is to bring e p（n）、e p（n-1）、e p (n-2) into the formula of the formula Δu p (n) to obtain Δu p (n), where the frequency of the positive inverter is unchanged, and the frequency of the negative inverter u Negative pole （n）= u Negative pole （n-1）+Δup (n). the specific flow regulation process is to bring the e q（n）、e q（n-1）、e q (n-2) into the formula of the Deltau q (n) to obtain Deltau q (n), if the positive flow is smaller than the negative flow, the frequency u Positive direction （n）= u Positive direction （n-1）+Δuq (n) of the positive frequency converter, Negative inverter frequency u Negative pole （n）= u Negative pole （n-1）*（u Positive direction （n-1）+Δuq（n））/ u Positive direction (n-1), whereas positive inverter frequency u Positive direction （n）= u Positive direction （n-1）*（u Negative pole （n-1）+Δuq（n））/ u Negative pole (n-1), negative inverter frequency u Negative pole （n）= u Negative pole （n-1）+Δuq (n). the specific adjusting process of the integrated pressure and flow adjustment is that the e p（n）、e p（n-1）、e p (n-2) is carried into the formula of the Deltau p (n) to obtain Deltau p (n), the e q（n）、e q（n-1）、e q (n-2) is carried into the formula of the Deltau q (n) to obtain Deltau q (n), If at least one of u Positive direction (n-1) and u Negative pole (n-1) is zero, then the positive inverter frequency u Positive direction （n）= u Positive direction （n-1）+Δuq (n), the negative inverter frequency u Negative pole （n）= u Negative pole （n-1）+Δuq（n）+Δup (n), if both u Positive direction (n-1) and u Negative pole (n-1) are non-zero and the positive flow is less than the negative flow, then the positive inverter frequency u Positive direction （n）= u Positive direction （n-1）+Δuq (n), the negative inverter frequency u Negative pole （n）= u Negative pole （n-1）*（u Positive direction （n-1）+Δuq（n））/ u Positive direction (n-1), If u Positive direction (n-1) and u Negative pole (n-1) are both non-zero and the positive flow is equal to or greater than the negative flow, then the positive frequency converter frequency u Positive direction （n）= u Positive direction （n-1）*（u Negative pole （n-1）+Δuq（n））/ u Negative pole (n-1) and the negative frequency converter frequency u Negative pole （n）= u Negative pole （n-1）+Δuq（n）+Δup (n).
It should be noted that, in this embodiment, the specific size of the preset parameter may be determined according to the actual control requirement, which is not limited herein.
According to the control method of the flow battery system, the frequency increment of the positive frequency converter and the frequency increment of the negative frequency converter in the flow battery system are determined according to preset control parameters, flow errors and pressure errors, so that the flow and the pressure of the flow battery system are regulated, the flow and the pressure are regulated in a combined mode, the situation that the service life of an exchange membrane is reduced or even damaged due to the fact that the pressure difference between two sides of the exchange membrane in the system is too large due to the fact that the pressure is not considered in flow regulation is prevented, and the performance and the stability of the system are influenced due to the fact that electrolyte leaks or permeates into an area which should not be reached is prevented, and therefore the working reliability of the system is guaranteed; and the pressure difference at two sides of the exchange membrane in the system is controlled within a certain range while the flow is regulated, so that the service life of the exchange membrane is prolonged.
Example III
Fig. 4 is a block diagram of a control device of a flow battery system according to a third embodiment of the present invention. Referring to fig. 4, the control apparatus includes: a parameter acquisition module 310, a flow determination module 320, and an increment determination module 330. The parameter obtaining module 310 is configured to obtain an open-circuit voltage, an anode flow rate, and an anode pressure and a cathode pressure of the flow battery system; the flow determining module 320 is configured to determine a state of charge of the flow battery system according to the open circuit voltage and a fitted curve of the open circuit voltage and the state of charge, and determine a target flow according to the state of charge; the increment determining module 330 is configured to determine a frequency increment of the positive frequency converter and a frequency increment of the negative frequency converter in the flow battery system according to the target flow, the positive and negative flow, and the positive and negative pressure, so as to adjust the flow and the pressure of the flow battery system (incremental PID adjustment, which can reduce the memory loss of the control device).
On the basis of the above embodiment, the increment determination module includes:
The error determining unit is used for determining flow errors and pressure errors according to the target flow, the anode flow, the cathode flow and the anode pressure and the cathode pressure;
The parameter determining unit is used for determining each preset control parameter by looking up a table according to the flow error and the pressure error;
And the increment determining unit is used for determining the frequency increment of the positive frequency converter and the frequency increment of the negative frequency converter in the flow battery system according to preset control parameters, flow errors and pressure errors.
In one embodiment, the increment determining unit includes:
The first increment subunit is used for determining the frequency increment of pressure regulation according to the pressure error if the absolute value of the pressure error is larger than a preset first pressure threshold value;
The second increment subunit is used for determining the frequency increment of flow regulation according to the flow error if the absolute value of the pressure error is smaller than a preset second pressure threshold value and the frequency of the positive frequency converter and the frequency of the negative frequency converter in the flow battery system are not zero; the preset first pressure threshold is larger than the preset second pressure threshold;
And the third increment subunit is used for determining the frequency increment of pressure regulation according to the pressure error and determining the frequency increment of flow regulation according to the flow error if the absolute value of the pressure error is smaller than or equal to a preset first pressure threshold value and larger than or equal to a preset second pressure threshold value.
Preferably, the third incremental subunit comprises:
A fourth increment subunit, configured to bring the pressure error into a preset pressure formula to obtain a frequency increment Δu p (n) of pressure adjustment, and bring the flow error into a preset flow formula to obtain a frequency increment Δu q (n) of flow adjustment;
A fifth increment subunit, configured to determine a frequency u Positive direction （n）= u Positive direction （n-1）+Δuq (n) of the positive frequency converter and a frequency u Negative pole （n）= u Negative pole （n-1）*（u Positive direction （n-1）+Δuq（n））/ u Positive direction （n-1）+Δup (n) of the negative frequency converter if the frequency of the positive frequency converter and the frequency of the negative frequency converter are both different from zero and the positive flow is smaller than the negative flow;
And the sixth increment subunit is configured to determine the frequency u Positive direction （n）= u Positive direction （n-1）*（u Negative pole （n-1）+Δuq（n））/ u Negative pole (n-1) of the positive frequency converter and the frequency u Negative pole （n）= u Negative pole （n-1）+Δuq（n）+Δup (n) of the negative frequency converter if the frequency of the positive frequency converter and the frequency of the negative frequency converter are both different from zero and the positive flow is greater than or equal to the negative flow.
Preferably, the third incremental subunit comprises:
A seventh increment subunit, configured to bring the pressure error into a preset pressure formula to obtain a frequency increment Δu p (n) of pressure adjustment, and bring the flow error into a preset flow formula to obtain a frequency increment Δu q (n) of flow adjustment;
And the eighth increment subunit is configured to determine the frequency u Positive direction （n）= u Positive direction （n-1）+Δuq (n) of the positive frequency converter and/or the frequency u Negative pole （n）= u Negative pole （n-1）+Δuq（n）+Δup (n) of the negative frequency converter if the frequency of the positive frequency converter and/or the frequency of the negative frequency converter are/is zero.
Preferably, the error determination unit includes:
The first difference subunit is used for determining the flow error as the difference value between the target flow and the positive flow if the positive flow is smaller than the negative flow;
the second difference subunit is used for determining the flow error as the difference value between the target flow and the negative flow if the positive flow is greater than or equal to the negative flow;
And the error determination subunit is used for taking the difference value between the positive electrode pressure and the negative electrode pressure as a pressure error.
Optionally, the flow determination module 320 includes:
and the flow determining unit is used for determining the target flow according to the state of charge table lookup.
The control device of the flow battery system provided in this embodiment belongs to the same inventive concept as the control method of the flow battery system provided in any embodiment of the present invention, and has corresponding beneficial effects, and technical details not elaborated in this embodiment are not shown in detail in the control method of the flow battery system provided in any embodiment of the present invention.
Note that the above is only a preferred embodiment of the present invention and the technical principle applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, and that various obvious changes, rearrangements, combinations, and substitutions can be made by those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.
Claims (4)
1. A control method of a flow battery system, comprising:
acquiring open circuit voltage, positive electrode flow, negative electrode flow, positive electrode pressure and negative electrode pressure of a flow battery system;
Determining the state of charge of the flow battery system according to the open-circuit voltage and a fitting curve of the open-circuit voltage and the state of charge, and determining a target flow according to the state of charge;
Determining the frequency increment of a positive frequency converter and the frequency increment of a negative frequency converter in the flow battery system according to the target flow, the positive flow, the negative flow, the positive pressure and the negative pressure so as to regulate the flow and the pressure of the flow battery system;
The determining the frequency increment of the positive frequency converter and the frequency increment of the negative frequency converter in the flow battery system according to the target flow, the positive flow, the negative flow, the positive pressure and the negative pressure comprises:
determining the flow error and the pressure error according to the target flow, the positive flow, the negative flow, the positive pressure and the negative pressure;
According to the flow error and the pressure error, table lookup is performed to determine each preset control parameter; each preset control parameter corresponding to the flow error and the pressure error is recorded in a table;
Determining the frequency increment of a positive frequency converter and the frequency increment of a negative frequency converter in the flow battery system according to the preset control parameters, the flow error and the pressure error;
the determining, according to the preset control parameter, the flow error and the pressure error, the frequency increment of the positive frequency converter and the frequency increment of the negative frequency converter in the flow battery system includes:
If the absolute value of the pressure error is larger than a preset first pressure threshold value, determining the frequency increment of pressure regulation according to the pressure error;
If the absolute value of the pressure error is smaller than a preset second pressure threshold value and the frequency of the positive frequency converter and the frequency of the negative frequency converter in the flow battery system are not zero, determining the frequency increment of flow regulation according to the flow error; the preset first pressure threshold is greater than the preset second pressure threshold;
if the absolute value of the pressure error is smaller than or equal to the preset first pressure threshold value and larger than or equal to the preset second pressure threshold value, determining the frequency increment of pressure regulation according to the pressure error, and determining the frequency increment of flow regulation according to the flow error;
the determining the frequency increment of the pressure regulation according to the pressure error and the frequency increment of the flow regulation according to the flow error comprises the following steps:
The pressure error is brought into a preset pressure formula to obtain a frequency increment Deltau p (n) of pressure regulation, and the flow error is brought into a preset flow formula to obtain a frequency increment Deltau q (n) of flow regulation; wherein ,Δup（n）= kp-p（e p（n）- e p（n-1））+ ki-pe p（n）+ kd-p（e p（n）-2 e p（n-1）+ e p（n-2））,Δu q（n）= kp-q（e q（n）- e q（n-1））+ ki-qe q（n）+ kd-q（e q（n）-2 e q（n-1）+ e q（n-2））, k p-p、ki-p 、kd-p 、kp-q、ki-q、kd-q is a preset control parameter, n is greater than or equal to 2, e p (n) is a pressure error at the current moment, e p (n-1) is a pressure error at the previous moment, e q (n) is a flow error at the current moment, e q (n-1) is a flow error at the previous moment, the flow error is a difference value between the target flow and the positive flow or a difference value between the target flow and the negative flow, and the pressure error is a difference value between the positive pressure and the negative pressure;
If the frequency of the positive frequency converter and the frequency of the negative frequency converter are not zero and the positive flow is smaller than the negative flow, determining the frequency u Positive direction （n）= u Positive direction （n-1）+Δuq (n) of the positive frequency converter and the frequency u Negative pole （n）= u Negative pole （n-1）*（u Positive direction （n-1）+Δuq（n））/ u Positive direction （n-1）+Δup (n) of the negative frequency converter; wherein u Positive direction (n-1) is the frequency of the positive frequency converter at the previous time, and u Negative pole (n-1) is the frequency of the negative frequency converter at the previous time;
if the frequency of the positive frequency converter and the frequency of the negative frequency converter are not zero and the positive flow is greater than or equal to the negative flow, determining the frequency u Positive direction （n）= u Positive direction （n-1）*（u Negative pole （n-1）+Δuq（n））/ u Negative pole (n-1) of the positive frequency converter and the frequency u Negative pole （n）= u Negative pole （n-1）+Δuq（n）+Δup (n) of the negative frequency converter;
If the frequency of the positive frequency converter and/or the frequency of the negative frequency converter is zero, determining the frequency u Positive direction （n）= u Positive direction （n-1）+Δuq (n) of the positive frequency converter and the frequency u Negative pole （n）= u Negative pole （n-1）+Δuq（n）+Δup (n) of the negative frequency converter.
2. The control method according to claim 1, wherein the determining a flow error and a pressure error from the target flow rate, the positive electrode flow rate, the negative electrode flow rate, the positive electrode pressure, and the negative electrode pressure includes:
If the positive flow is smaller than the negative flow, determining that the flow error is the difference value between the target flow and the positive flow;
If the positive flow is greater than or equal to the negative flow, determining that the flow error is the difference value between the target flow and the negative flow;
and taking the difference value of the positive electrode pressure and the negative electrode pressure as the pressure error.
3. The control method according to claim 1, characterized in that the determining a target flow rate according to the state of charge includes:
And determining the target flow according to the state of charge table.
4. A control device of a flow battery system, comprising:
the parameter acquisition module is used for acquiring the open-circuit voltage, the positive electrode flow, the negative electrode flow, the positive electrode pressure and the negative electrode pressure of the flow battery system;
The flow determining module is used for determining the state of charge of the flow battery system according to the open circuit voltage and a fitting curve of the open circuit voltage and the state of charge, and determining a target flow according to the state of charge;
The increment determining module is used for determining the frequency increment of the positive frequency converter and the frequency increment of the negative frequency converter in the flow battery system according to the target flow, the positive flow, the negative flow, the positive pressure and the negative pressure so as to adjust the flow and the pressure of the flow battery system;
The increment determination module includes:
An error determination unit configured to determine a flow error and a pressure error according to the target flow rate, the positive electrode flow rate, the negative electrode flow rate, the positive electrode pressure, and the negative electrode pressure;
The parameter determining unit is used for determining each preset control parameter by looking up a table according to the flow error and the pressure error; each preset control parameter corresponding to the flow error and the pressure error is recorded in a table;
The increment determining unit is used for determining the frequency increment of the positive frequency converter and the frequency increment of the negative frequency converter in the flow battery system according to the preset control parameter, the flow error and the pressure error;
the increment determination unit includes:
A first increment subunit, configured to determine a frequency increment of pressure adjustment according to the pressure error if the absolute value of the pressure error is greater than a preset first pressure threshold;
The second increment subunit is used for determining the frequency increment of flow regulation according to the flow error if the absolute value of the pressure error is smaller than a preset second pressure threshold and the frequency of the positive frequency converter and the frequency of the negative frequency converter in the flow battery system are not zero; the preset first pressure threshold is greater than the preset second pressure threshold;
A third increment subunit, configured to determine a frequency increment of pressure adjustment according to the pressure error and determine a frequency increment of flow adjustment according to the flow error if the absolute value of the pressure error is equal to or smaller than the preset first pressure threshold and equal to or greater than the preset second pressure threshold;
The third incremental subunit includes:
a fourth increment subunit, configured to bring the pressure error into a preset pressure formula to obtain a frequency increment Δu p (n) of pressure regulation, and bring the flow error into a preset flow formula to obtain a frequency increment Δuq（n）;Δup（n）= kp-p（e p（n）- e p（n-1））+ ki-pe p（n）+ kd-p（e p（n）-2 e p（n-1）+ e p（n-2））,Δu q（n）= kp-q（e q（n）- e q（n-1））+ ki-qe q（n）+ kd-q（e q（n）-2 e q（n-1）+ e q（n-2））, of flow regulation, where k p-p、ki-p 、kd-p、kp-q、ki-q、kd-q is a preset control parameter, n is greater than or equal to 2, e p (n) is a pressure error at a current time, e p (n-1) is a pressure error at a previous time, e q (n) is a flow error at a current time, e q (n-1) is a flow error at a previous time, and the flow error is a difference value between the target flow and the positive flow or a difference value between the target flow and the negative flow, and the pressure error is a difference value between the positive pressure and the negative pressure;
A fifth increment subunit, configured to determine a frequency u Positive direction （n）= u Positive direction （n-1）+Δuq (n) of the positive frequency converter and a frequency u Negative pole （n）= u Negative pole （n-1）*（u Positive direction （n-1）+Δuq（n））/ u Positive direction （n-1）+Δup (n) of the negative frequency converter if the frequency of the positive frequency converter and the frequency of the negative frequency converter are both different from zero and the positive flow is smaller than the negative flow; wherein u Positive direction (n-1) is the frequency of the positive frequency converter at the previous time, and u Negative pole (n-1) is the frequency of the negative frequency converter at the previous time;
A sixth increment subunit, configured to determine a frequency u Positive direction （n）= u Positive direction （n-1）*（u Negative pole （n-1）+Δuq（n））/ u Negative pole (n-1) of the positive frequency converter and a frequency u Negative pole （n）= u Negative pole （n-1）+Δuq（n）+Δup (n) of the negative frequency converter if the frequency of the positive frequency converter and the frequency of the negative frequency converter are both different from zero and the positive flow is greater than or equal to the negative flow;
And an eighth increment subunit, configured to determine a frequency u Positive direction （n）= u Positive direction （n-1）+Δuq (n) of the positive frequency converter and a frequency u Negative pole （n）= u Negative pole （n-1）+Δuq（n）+Δup (n) of the negative frequency converter if the frequency of the positive frequency converter and/or the frequency of the negative frequency converter are zero.
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