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CN-122014638-A - Circulating water pump rotating speed control method and system for energy storage thermal management system

CN122014638ACN 122014638 ACN122014638 ACN 122014638ACN-122014638-A

Abstract

The invention discloses a circulating water pump rotating speed control method and system for an energy storage heat management system, wherein the method comprises the steps of collecting state parameters in the energy storage battery management system and the heat management system; the method comprises the steps of carrying out data processing according to the state parameters to obtain processed data, determining a control mode of a thermal management system by judging the battery temperature and the liquid supply temperature according to the processed data, and carrying out dynamic control on the rotating speed of the circulating water pump according to the processed data and the control mode. According to the method, the temperature of the battery, the change rate of the temperature of the battery and the temperature of the liquid supply are monitored in real time, and the rotating speed of the circulating water pump is dynamically adjusted, so that the temperature control strategy is optimized, and the energy consumption is effectively reduced through accurate rotating speed adjustment.

Inventors

  • Ke Haishan

Assignees

  • 南京国电南自电网自动化有限公司

Dates

Publication Date
20260512
Application Date
20260303

Claims (10)

  1. 1. A method for controlling the rotational speed of a circulating water pump for an energy storage thermal management system, comprising: Collecting state parameters in an energy storage battery management system and a thermal management system; according to the state parameters, data processing is carried out to obtain processed data; determining a control mode of the thermal management system by judging the battery temperature and the liquid supply temperature according to the processed data; and dynamically controlling the rotating speed of the circulating water pump according to the processed data and the control mode.
  2. 2. The method of claim 1, wherein the status parameters include battery temperature, battery temperature profile, liquid supply temperature, and circulating water pump speed.
  3. 3. The method of claim 1, wherein the processed data includes a maximum battery temperature, a minimum battery temperature, an average battery temperature change rate, and a feed liquid temperature change rate; The battery average temperature change rate is a battery temperature change difference value in unit time, and comprises a battery average temperature change rate larger than 0 when the battery average temperature is increased, a battery average temperature change rate smaller than 0 when the battery average temperature is reduced, and a battery average temperature change rate equal to 0 when the battery average temperature is unchanged; Under normal conditions, the temperature of the battery is judged, and the control of the rotation speed of the circulating water pump is related to the average temperature change rate of the battery: Dividing the average temperature change rate of the battery into a temperature gentle change interval, a temperature moderate change interval and a temperature severe change interval, wherein the temperature moderate change interval is used as a main strategy for regulating the rotating speed of the circulating water pump; The liquid supply temperature change rate is a liquid supply temperature change difference value in unit time, and comprises that when the liquid supply temperature is increased, the liquid supply temperature change rate is more than 0, when the liquid supply temperature is reduced, the liquid supply temperature change rate is less than 0, and when the liquid supply temperature is unchanged, the liquid supply temperature change rate is equal to 0; under abnormal conditions, the liquid supply temperature is judged, and the rotation speed control of the circulating water pump is related to the change rate of the liquid supply temperature: The liquid supply temperature change rate is divided into a liquid supply temperature gentle change interval, a temperature moderate change interval and a temperature severe change interval, and the liquid supply temperature change rate is used as an auxiliary strategy for controlling the rotation speed of the circulating water pump.
  4. 4. The method for controlling rotational speed of a circulating water pump in an energy storage thermal management system according to claim 1, wherein the control modes in the thermal management system include a cooling mode, a heating mode and a self-circulation mode, and the process of determining the battery temperature is that the thermal management system starts the heating mode when the lowest battery temperature is less than a lowest battery temperature threshold of the heating mode; when the thermal management system operates in the heating mode, and the lowest temperature of the battery is greater than or equal to the lowest temperature threshold of the battery in the heating mode and is less than the temperature switching threshold of the battery in the self-circulation mode, the thermal management system maintains the heating mode; when the lowest temperature of the battery is greater than or equal to a battery temperature switching threshold value for converting the heating mode into the self-circulation mode, the thermal management system starts the self-circulation mode; When the highest temperature of the battery is greater than a highest temperature threshold of the battery in the refrigeration mode, the thermal management system starts the refrigeration mode; when the thermal management system operates in the refrigeration mode, and the battery maximum temperature is greater than or equal to a battery temperature switching threshold value from the refrigeration mode to the self-circulation mode and is less than the battery maximum temperature threshold value of the refrigeration mode, the thermal management system maintains the refrigeration mode; When the highest temperature of the battery is less than or equal to a battery temperature switching threshold value for switching from a refrigeration mode to a self-circulation mode, the thermal management system starts the self-circulation mode; When the judging process appears and simultaneously meets the triggering conditions of multiple modes, the thermal management system controls the judging process to be executed according to the priority that the refrigerating mode is larger than the heating mode and is larger than the self-circulation mode: When the battery maximum temperature is larger than the battery maximum temperature threshold of the heating mode and the battery minimum temperature is smaller than the battery minimum temperature threshold of the cooling mode, the thermal management system alarms to prompt that the battery temperature difference is overlarge or the battery temperature data is abnormal, the battery sub-maximum temperature of the thermal management system is replaced by the battery maximum temperature and the battery sub-minimum temperature is replaced by the battery minimum temperature; When the battery maximum temperature is larger than the battery secondary maximum temperature threshold of the starting refrigeration mode under the abnormal condition and the battery minimum temperature is smaller than the battery secondary minimum temperature threshold of the starting heating mode under the abnormal condition, the thermal management system alarms to prompt that the battery temperature difference is overlarge or the battery temperature data is abnormal, the battery secondary maximum temperature of the thermal management system is replaced by the battery maximum temperature, the battery secondary minimum temperature is replaced by the battery minimum temperature, and the thermal management system is judged again according to the step of determining the control mode, and when the battery secondary maximum temperature of the thermal management system is replaced by the battery maximum temperature and the condition that the battery secondary minimum temperature is replaced by the battery minimum temperature exceeds the set times, the thermal management system still alarms to prompt that the battery temperature difference is overlarge or the battery temperature data is abnormal, prompt that an operation and maintenance person needs to overhaul the energy storage system, and the judgment is converted into the liquid supply temperature.
  5. 5. The method for controlling the rotational speed of a circulating water pump in an energy storage thermal management system according to claim 4, wherein the process of determining the temperature of the liquid supply is: When the liquid supply temperature is smaller than the liquid supply lowest temperature threshold value of the heating mode, the thermal management system starts the heating mode; if the thermal management system operates in the heating mode, and the liquid supply temperature is greater than or equal to the liquid supply lowest temperature threshold of the heating mode and less than the liquid supply temperature switching threshold for converting the heating mode into the self-circulation mode, the thermal management system maintains the heating mode; when the liquid supply temperature is greater than or equal to a liquid supply temperature switching threshold value for converting the heating mode into the self-circulation mode, the thermal management system starts the self-circulation mode; when the liquid supply temperature is greater than the liquid supply highest temperature threshold value of the refrigeration mode, the thermal management system starts the refrigeration mode; If the thermal management system operates in the refrigeration mode and the liquid supply temperature is greater than or equal to the liquid supply temperature switching threshold value of the self-circulation mode and less than the liquid supply highest temperature threshold value of the refrigeration mode, the thermal management system maintains the refrigeration mode; when the liquid supply temperature is less than or equal to a liquid supply temperature switching threshold value for switching the refrigeration mode to the self-circulation mode, the heat management system starts the self-circulation mode; When the judging process appears and simultaneously meets the triggering conditions of multiple modes, the thermal management system controls the judging process to be executed according to the priority that the refrigerating mode is larger than the heating mode and is larger than the self-circulation mode: When the liquid supply temperature is smaller than the liquid supply temperature threshold value triggering the heating mode under the dynamic adjustment of the circulating water pump, the rotating speed of the circulating water pump is dynamically adjusted, and when the liquid supply temperature is larger than the liquid supply temperature threshold value triggering the cooling mode under the dynamic adjustment of the circulating water pump, the rotating speed of the circulating water pump is dynamically adjusted.
  6. 6. The method for controlling the rotational speed of a circulating water pump for an energy storage thermal management system according to claim 3, wherein the rotational speed control of the circulating water pump is directly related to the average temperature change rate of the battery under normal conditions, and the correspondence is described by the following expression: ; Wherein, the The percentage is initially set for the rotation speed of the circulating water pump, The corresponding rotating speed is the gentle change of the average temperature of the battery, The rotation speed corresponding to the moderate change of the average temperature of the battery, For the rotational speed corresponding to the drastic change of the average temperature of the battery, For the rated rotation speed of the circulating water pump, Is battery temperature data comprising a battery maximum temperature, a battery minimum temperature, a battery average temperature and a battery average temperature change rate; The average temperature change rate of the battery; Setting the value of the parameter; In abnormal situations, the rotation speed control of the circulating water pump is related to the change rate of the temperature of the liquid supply, and the corresponding relation is described by the following expression: ; Wherein, the The percentage is initially set for the rotation speed of the circulating water pump, In order to smoothly change the corresponding rotating speed of the liquid supply temperature, For the rotation speed corresponding to the moderate change of the liquid supply temperature, In order to change the rotation speed corresponding to the severe temperature change of the liquid supply, For the rated rotation speed of the circulating water pump, Is the liquid supply temperature; is the temperature change rate of the liquid supply; 、 And (5) setting the value for the parameter.
  7. 7. The method according to claim 6, wherein the expression for controlling the rotational speed of the circulating water pump is: ; Wherein, the For the calculated value of the rotation speed of the circulating water pump, As a first rotational speed control factor, Is a second rotational speed control factor; for the highest temperature of the battery, For the minimum temperature of the battery, For the battery minimum temperature threshold of the heating mode, A battery maximum temperature threshold for a cooling mode; A battery sub-minimum temperature threshold value for starting a heating mode under abnormal conditions; a battery sub-maximum temperature threshold for starting a cooling mode in an abnormal situation; During acquisition of Then, limiting control is carried out, and the final rotating speed set value is as follows: ; Under abnormal conditions, the rotation speed control expression of the circulating water pump is as follows: ; Wherein, the Is the rotation speed of the circulating water pump percentage initial calculation; A lowest temperature threshold value of liquid supply for heating mode, A maximum liquid supply temperature threshold for the cooling mode; a liquid supply temperature threshold value for triggering a heating mode dynamically regulated by the circulating water pump; A liquid supply temperature threshold value for triggering a refrigeration mode of dynamic adjustment of the circulating water pump; During acquisition of Then, limiting control is carried out, and the final rotating speed set value is as follows: 。
  8. 8. a circulating water pump rotational speed control system for an energy storage thermal management system, comprising: the data acquisition module is used for acquiring state parameters in the energy storage battery management system and the thermal management system; the data processing module is used for performing data processing according to the state parameters to obtain processed data; The control mode decision module is used for determining a control mode of the thermal management system by judging the battery temperature and the liquid supply temperature according to the processed data; And the control execution module is used for dynamically controlling the rotating speed of the circulating water pump according to the processed data and the control mode.
  9. 9. A computer readable storage medium having stored thereon a computer program/instruction, which when executed by a processor, implements the steps of the circulating water pump rotational speed control method for an energy storage thermal management system of any one of claims 1 to 7.
  10. 10. A computer apparatus/device/system comprising: A memory for storing computer programs/instructions; A processor for executing the computer program/instructions to implement the steps of the circulating water pump speed control method for an energy storage thermal management system of any one of claims 1 to 7.

Description

Circulating water pump rotating speed control method and system for energy storage thermal management system Technical Field The invention relates to a circulating water pump rotating speed control method and system for an energy storage heat management system, and belongs to the technical field of battery heat management. Background The existing energy storage liquid cold and hot management system depends on temperature extremum judgment (such as Tbmax or Tbmin) of a single battery, does not respond to temperature change rate in the charging and discharging process, is easy to generate over temperature or under temperature, is rough in control of the rotating speed of a circulating water pump, adopts fixed rotating speed or rotating speed sectional control, is not fine enough, causes energy consumption waste of the water pump, is easy to run away when a battery temperature sensor is abnormal, and lacks a redundant control mechanism. Therefore, it is important to develop a control method capable of optimizing the temperature control strategy of the thermal management system and precisely adjusting the circulating water pump. Disclosure of Invention The invention aims to provide a circulating water pump rotating speed control method and system for an energy storage thermal management system, which are used for sensing the change trend of the battery temperature in advance through the battery temperature and the temperature change rate, supporting the fine speed regulation of the circulating water pump, controlling the battery temperature in a normal working range, reducing the running energy consumption of the circulating water pump and supporting the rotating speed control of the circulating water pump through the liquid supply temperature when the battery temperature acquisition data are abnormal. In order to achieve the above purpose, the invention is realized by adopting the following technical scheme. In a first aspect, the present invention provides a method for controlling a rotational speed of a circulating water pump for an energy storage thermal management system, including: Collecting state parameters in an energy storage battery management system and a thermal management system; according to the state parameters, data processing is carried out to obtain processed data; determining a control mode of the thermal management system by judging the battery temperature and the liquid supply temperature according to the processed data; and dynamically controlling the rotating speed of the circulating water pump according to the processed data and the control mode. Further, the state parameters include battery temperature, battery temperature change curve, and liquid supply temperatureRotational speed of circulating water pump。 Further, the processed data includes the highest temperature of the batteryMinimum temperature of batteryAverage temperature of batteryAverage temperature change rate of batteryRate of change of liquid supply temperature; Average temperature change rate of the batteryThe difference in battery temperature change per unit time, including when the average battery temperature increases,And when the average temperature of the battery is lowered,When the average temperature of the battery is not changed,; Under normal conditions, the temperature of the battery is judged, and the rotation speed of the circulating water pump is controlledThere is an association: Will be The method comprises the steps of dividing a temperature gentle change interval, a temperature moderate change interval and a temperature severe change interval, and using the temperature moderate change interval and the temperature severe change interval as a main strategy for regulating the rotating speed of the circulating water pump; the temperature gradual change section is expressed as The temperature intermediate change interval is expressed asThe temperature sharp change interval is expressed asWherein、Is fixed for parameters and。 Further, the rate of change of the temperature of the feed liquidThe difference value of the temperature change of the liquid supply in unit time comprises that when the temperature of the liquid supply rises,When the temperature of the liquid supply is reduced,When the temperature of the liquid supply is unchanged,; Under abnormal conditions, the temperature of the liquid supply is judged, and the rotation speed of the circulating water pump is controlledThere is an association: Will be The method comprises the steps of dividing a liquid supply temperature gentle change interval, a temperature moderate change interval and a temperature severe change interval into auxiliary strategies for controlling the rotation speed of the circulating water pump; the gentle variation interval of the liquid supply temperature is expressed as The temperature intermediate change interval is expressed asThe temperature sharp change interval is expressed asWherein、Is fixed for parameters and。 Further, the co