CN-122026601-A - Energy management method, device, equipment and medium of hybrid energy storage system

CN122026601ACN 122026601 ACN122026601 ACN 122026601ACN-122026601-A

Abstract

The invention discloses an energy management method, device, equipment and medium of a hybrid energy storage system, which relate to the technical field of energy management of energy systems and comprise the steps of acquiring system operation data and total required power, carrying out power distribution decision based on the system operation data, carrying out dynamic coordination correction according to the current system operation mode and the total required power, and carrying out real-time monitoring of the terminal voltage change rate of a power type energy storage unit in the power distribution process by introducing a dynamic coordination correction mechanism, so that overvoltage or undervoltage protection of the power type energy storage unit, which is triggered by severe terminal voltage fluctuation, is effectively avoided, the operation reliability and the service life of the power type energy storage unit are obviously improved, the frequency and the depth of the power type energy storage unit for coping with instant power impact are reduced, and the state of charge of the power type energy storage unit is stably maintained in a high-efficiency working interval, thereby reducing the internal resistance loss and heat loss of the system, and further improving the overall energy conversion efficiency and the operation economy of the hybrid energy storage system.

Inventors

ZHOU JIAN

Assignees

巨硕电力建设有限公司

Dates

Publication Date: 20260512
Application Date: 20260211

Claims (10)

1. An energy management method of a hybrid energy storage system, comprising, the hybrid energy storage system comprising a power-type energy storage unit and an energy-type energy storage unit, the energy management method comprising the steps of: S1, acquiring system operation data and total required power; s2, judging the current system operation mode based on the system operation data; s3, performing power distribution decision according to the current system operation mode and the total required power, and generating initial power instructions of the power type energy storage unit and the energy type energy storage unit; S4, executing dynamic coordination correction, carrying out real-time adjustment on the initial power instruction, generating a final power instruction and issuing the final power instruction to a corresponding energy storage unit for execution; In the step S4, calculating a terminal voltage change rate based on the real-time terminal voltage data of the power type energy storage unit obtained in the step S1, and generating a correction strategy according to the terminal voltage change rate, wherein when the terminal voltage change rate exceeds a preset safety threshold, the correction strategy comprises increasing the output share of the power type energy storage unit in the next control period and correspondingly reducing the output share of the power type energy storage unit; According to the method, through the correction in the step S4, the power type energy storage unit is actively prevented from triggering overvoltage or undervoltage protection due to severe fluctuation of terminal voltage, so that the service life of the power type energy storage unit is prolonged; According to the method, the number of deep charge and discharge cycles of the power type energy storage unit caused by frequent transient power impact is reduced, so that the charge state of the power type energy storage unit is maintained in an efficient working range, the internal resistance loss and the heat loss of the power type energy storage unit are reduced, and the overall energy conversion efficiency and the operation economy of the hybrid energy storage system are improved on the basis of prolonging the service life of the unit.
2. The method of energy management of a hybrid energy storage system of claim 1, wherein said obtaining system operational data and total required power further comprises, S11, collecting bus voltage and output current of the hybrid energy storage system, terminal voltage of the power type energy storage unit and the energy type energy storage unit and real-time charge state in real time; and S12, receiving a power instruction issued by an upper layer system and determining the total required power according to a local power scheduling algorithm.
3. The method for energy management of a hybrid energy storage system according to claim 2, wherein said step S3 comprises the steps of, S31, determining an instantaneous power capacity boundary of the power type energy storage unit according to the power characteristic parameter of the power type energy storage unit and the first real-time charge state; S32, determining a sustainable power capacity boundary according to the power characteristic parameter of the energy type energy storage unit and the second real-time charge state; And S33, calculating the initial power instruction within the instantaneous power capacity boundary and the sustainable power capacity boundary by taking the total required power as a constraint and taking the minimum system total loss as an optimization target.
4. The energy management method of a hybrid energy storage system according to claim 3, wherein in the step S33, the total system loss includes charge-discharge loss of the power type energy storage unit and the energy type energy storage unit based on equivalent internal resistances, switching loss and conduction loss of the respective corresponding power converters, and penalty term loss introduced for the first real-time state of charge and the second real-time state of charge deviating from the respective set operation intervals.
5. The method according to claim 1, wherein the step S4 further comprises evaluating the available capacity of the energy storage unit to perform power compensation based on the real-time state of charge data of the energy storage unit acquired in the step S1; in the step S2, the current system operation mode is determined to include one of a high-power combined discharge mode, a low-power distribution mode, a regenerative braking energy recovery mode and a static standby mode according to the sign and the amplitude of the total required power, and the first real-time state of charge and the second real-time state of charge.
6. The method of energy management of a hybrid energy storage system according to claim 3, wherein the "minimize total system loss" in step S33 is calculated by the following formula, ; The constraint condition of the method is that, ; ; ; Wherein, P power represents an initial power instruction of the power type energy storage unit in the next control period, which is greater than 0 discharge and less than 0 charge; p energy represents an initial power instruction in the next control period of the energy storage unit, wherein the initial power instruction is greater than 0 discharge and less than 0 charge; R power represents the equivalent internal resistance of the power type energy storage unit at the current S p and the temperature, and is obtained by interpolation of an experimental calibration table; R energy represents the equivalent internal resistance of the energy storage unit at the current S e and the temperature, and is obtained by interpolation of an experimental calibration table; s p represents the real-time state of charge of the power type energy storage unit; s e represents the real-time state of charge of the energy storage unit; s p,ref represents the midpoint SOC in the high-efficiency working interval of the power unit, and is given by cycle life-SOC curve fitting; S e,ref represents the midpoint SOC of the high-efficiency working interval of the energy unit, and is given by cycle life-SOC curve fitting; Lambda p represents the power-type unit deviation penalty coefficient, 0 is taken when S p is in the high-efficiency interval [ S p, Low and low ,S p, High height ], otherwise Linearly increasing, wherein K pun is a preset gain, the value of K pun is 0.7 in the power type unit, and the value of K pun is 0.4 in the energy type unit; lambda e represents the energy type unit deviation penalty coefficient, and the value logic is the same as lambda p ; p total represents the total required power of the system, and is determined by step S12; P power,min (S p ) represents the maximum charge power (negative value) allowed by the power type unit at the current S p , given by the instantaneous power capability boundary calculation of step S31; P power,max (S p ) represents the maximum discharge power (positive value) allowed by the power type unit under the current S p , and is given by the calculation of the instantaneous power capability boundary in step S31; P energy,min (S e ) represents the maximum charge power (negative value) allowed by the energy type unit at the current S e , given by the step S32 sustainable power capability boundary calculation; P energy,max (S e ) represents the maximum discharge power (positive value) allowed by the energy type unit at the current S e , which is given by the sustainable power capability boundary calculation at step S32.
7. The method, apparatus, device and medium for energy management of a hybrid energy storage system of claim 4, wherein said penalty loss is expressed as, ; Wherein, the ; ; K represents the total penalty gain; c p 、C e represents the rated capacities of the power type and energy type units, respectively; v p 、C e represents rated voltages of the power type and energy type units, respectively; the terminal voltage change rate determination and correction formula in the step S4 is as follows, ; The corrected power command is given as, ; ; Wherein, the ; V k represents the end voltage of the power type energy storage unit obtained by sampling in the current control period; V k-1 represents the end voltage of the power type energy storage unit obtained by sampling in the last control period; ts represents a sampling period; beta represents correction gain, dimensionless, here takes a value of 0.5, and writes the correction gain and dimensionless value into a controller parameter table after off-line calibration; Alpha represents the power transfer proportion, and is determined by the following formula, the value range is limited to be [0,1], ; Wherein dv th represents a terminal voltage change rate safety threshold, and the calculation formula is that, Wherein, the The maximum current change rate, i.e. the protection threshold, allowed by the power type unit is given by the battery manufacturer and the system safety specifications.
8. An energy management device for a hybrid energy storage system, comprising, The system comprises a data acquisition module, a control module and a control module, wherein the data acquisition module is used for acquiring system operation data and total required power in real time, and the system operation data at least comprises terminal voltage, real-time charge state, bus voltage and output current of a power type energy storage unit and an energy type energy storage unit; The operation mode judging module is connected with the data acquisition module and used for judging the current system operation mode based on the system operation data; The initial power instruction generation module is connected with the running mode judging module and is used for carrying out power distribution decision according to the current system running mode and the total required power to generate initial power instructions of the power type energy storage unit and the energy type energy storage unit; The dynamic coordination correction module is connected with the initial power instruction generation module and is used for carrying out real-time adjustment on the initial power instruction, generating a final power instruction and sending the final power instruction to the corresponding energy storage unit for execution; The dynamic coordination correction module comprises a terminal voltage change rate calculation sub-module, a power type energy storage unit and a power type energy storage unit, wherein the terminal voltage change rate calculation sub-module is used for calculating the terminal voltage change rate of the power type energy storage unit based on real-time terminal voltage data of the power type energy storage unit and generating a correction strategy according to the terminal voltage change rate; the device actively avoids the triggering of overvoltage or undervoltage protection of the power type energy storage unit due to the severe fluctuation of terminal voltage through the dynamic coordination correction module, so that the service life of the power type energy storage unit is prolonged; The device enables the state of charge of the power type energy storage unit to be maintained in a high-efficiency working range by reducing the number of deep charge and discharge cycles caused by frequent transient power impact, reduces the internal resistance loss and the heat loss of the power type energy storage unit, and improves the overall energy conversion efficiency and the operation economy of the hybrid energy storage system on the basis of prolonging the service life of the unit.
9. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor, when executing the computer program, implements the steps of the energy management method of the hybrid energy storage system of any of claims 1 to 7.
10. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the steps of the energy management method of a hybrid energy storage system according to any one of claims 1 to 7.

Description

Energy management method, device, equipment and medium of hybrid energy storage system Technical Field The invention relates to the technical field of energy management of energy systems, in particular to an energy management method, device, equipment and medium of a hybrid energy storage system. Background The hybrid energy storage system is generally composed of a power type energy storage unit such as a super capacitor, a flywheel and the like and an energy type energy storage unit such as a lithium ion battery, a flow battery and the like, and aims to combine the advantages of the power type energy storage unit and the energy type energy storage unit to meet the dual requirements of the system on instantaneous high power and continuous stable energy. In the energy management process of the hybrid energy storage system, how to reasonably distribute the output ratio of the two types of energy storage units so as to realize the efficient, stable and long-service-life operation of the system is a key problem in the current research. In the prior art, the common energy management method is mostly based on a static power distribution strategy or switching control based on a preset rule, and although power distribution can be realized to a certain extent, the method generally lacks the capability of sensing and responding in real time to the dynamic running state of the energy storage unit. Particularly, when dealing with frequent power fluctuation or impact load, the power type energy storage unit often faces the problem of severe terminal voltage change due to the fact that excessive instantaneous power is born, overvoltage or undervoltage protection is easy to trigger, the unit is led to be out of operation, aging of the unit is accelerated, the service life of the unit is shortened, and the overall energy efficiency of the system is reduced. Disclosure of Invention The invention aims to provide an energy management method, device, equipment and medium of a hybrid energy storage system, which are used for solving the problem that a power type energy storage unit always bears excessive instantaneous power to cause severe terminal voltage change when the power type energy storage unit is used for coping with frequent power fluctuation or impact load in the prior art. In order to achieve the above purpose, the invention provides the following technical scheme that the energy management method, the device, the equipment and the medium of the hybrid energy storage system comprise a power type energy storage unit and an energy type energy storage unit, wherein the energy management method comprises the following steps: S1, acquiring system operation data and total required power; s2, judging the current system operation mode based on the system operation data; s3, performing power distribution decision according to the current system operation mode and the total required power, and generating initial power instructions of the power type energy storage unit and the energy type energy storage unit; S4, executing dynamic coordination correction, carrying out real-time adjustment on the initial power instruction, generating a final power instruction and issuing the final power instruction to a corresponding energy storage unit for execution; In the step S4, calculating a terminal voltage change rate based on the real-time terminal voltage data of the power type energy storage unit obtained in the step S1, and generating a correction strategy according to the terminal voltage change rate, wherein when the terminal voltage change rate exceeds a preset safety threshold, the correction strategy comprises increasing the output share of the power type energy storage unit in the next control period and correspondingly reducing the output share of the power type energy storage unit; According to the method, through the correction in the step S4, the power type energy storage unit is actively prevented from triggering overvoltage or undervoltage protection due to severe fluctuation of terminal voltage, so that the service life of the power type energy storage unit is prolonged; According to the method, the number of deep charge and discharge cycles of the power type energy storage unit caused by frequent transient power impact is reduced, so that the charge state of the power type energy storage unit is maintained in an efficient working range, the internal resistance loss and the heat loss of the power type energy storage unit are reduced, and the overall energy conversion efficiency and the operation economy of the hybrid energy storage system are improved on the basis of prolonging the service life of the unit. Further, the acquiring the system operation data and the total required power further comprises, S11, collecting bus voltage and output current of the hybrid energy storage system, terminal voltage of the power type energy storage unit and the energy type energy storage unit and real-time charge state in real time;