CN112798974B - Storage battery SOH on-line monitoring method and system for isolated base station hybrid power supply system - Google Patents

Storage battery SOH on-line monitoring method and system for isolated base station hybrid power supply system Download PDF

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CN112798974B
CN112798974B CN202011524921.XA CN202011524921A CN112798974B CN 112798974 B CN112798974 B CN 112798974B CN 202011524921 A CN202011524921 A CN 202011524921A CN 112798974 B CN112798974 B CN 112798974B
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storage battery
discharge
cycle
soh
depth
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CN112798974A (en
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刘威
彭琪
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709th Research Institute of CSIC
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/392—Determining battery ageing or deterioration, e.g. state of health
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/385—Arrangements for measuring battery or accumulator variables
    • G01R31/387—Determining ampere-hour charge capacity or SoC
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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Abstract

The invention discloses a method and a system for monitoring SOH (state of health) of a storage battery of an isolated base station hybrid power supply system on line, wherein the discharging current of the storage battery is sampled in each discharging process to obtain the discharging depth in the current circulating process; calculating equivalent cycle times under corresponding discharge depths according to the discharge depths in the cycle process, accumulating the sum of the equivalent cycle times under different discharge depths, and calculating by combining the linear coefficients of the health state of the storage battery and the equivalent cycle times to obtain the real-time health state of the storage battery, thereby realizing the online detection of the health state of the storage battery; SOH to be updated in real time simultaneously t The method is used for correcting and calculating the SOC based on the ampere-hour integration method, and the SOC variation of each discharge cycle of the storage battery is calibrated and estimated through the real-time updated health state of the storage battery, so that the estimation precision of the SOC is improved, and the SOH online detection accuracy is finally improved.

Description

Storage battery SOH online monitoring method and system for isolated base station hybrid power supply system
Technical Field
The invention relates to the technical field of video display and control, in particular to a storage battery SOH online monitoring method and system for an isolated base station hybrid power supply system.
Background
The method has important significance for designing a high-reliability base station power supply system which meets the basic power supply index requirement of a base station power supply for a remote area communication base station which cannot normally obtain commercial power supply. Compared with the traditional isolated base station power supply system solution taking the diesel generator as the main power supply, the system has the advantages that the renewable energy is connected into the base station load power supply, so that the use of non-renewable energy can be greatly reduced, and the pollution to the environment is reduced. Due to the characteristics of randomness and intermittence of natural resources such as wind, light and the like, an energy storage link is essential to a hybrid power supply system, and the balance of supply and demand of system power can be maintained through self charging and discharging. When the storage battery is used as an energy storage link, there are many factors that affect the reliable operation of the storage battery, including overcharge and overdischarge of the storage battery, unbalance of the storage battery in series connection, capacity attenuation in the process of recycling, and the like, which all cause the reduction of the service life of the storage battery and even cause irreparable damage to the storage battery, resulting in permanent scrapping of the storage battery. Therefore, monitoring the state of health (SOH) of the storage battery in real time is an important task for ensuring the reliable operation of the hybrid power supply system.
Disclosure of Invention
The invention aims to overcome the technical defects and provides a method and a system for monitoring the SOH of a storage battery of an isolated base station hybrid power supply system on line so as to realize the on-line detection of the health state of the storage battery.
In order to achieve the technical purpose, the technical scheme of the invention provides an isolated base station hybrid power supply system storage battery SOH online monitoring method, which comprises the following steps:
powering up and initializing a system;
each discharging process of the storage battery is regarded as a complete cycle period, and the discharging current of the storage battery is sampled in each discharging process to obtain the discharging depth in the current cycle process;
and calculating equivalent cycle times under corresponding discharge depths according to the discharge depths in the cycle process, accumulating the sum of the equivalent cycle times under different discharge depths, and calculating by combining the health state of the storage battery and a linear coefficient of the equivalent cycle times to obtain the real-time health state of the storage battery.
The technical scheme of the invention also provides an isolated base station hybrid power supply system storage battery SOH on-line monitoring system, which comprises the following functional modules:
the initialization module is used for system power-on initialization;
the discharge depth calculation module is used for regarding each discharge process of the storage battery as a complete cycle period, and sampling the discharge current of the storage battery in each discharge process to obtain the discharge depth in the current cycle process;
and the real-time state acquisition module is used for calculating equivalent cycle times under corresponding discharge depths according to the discharge depths in the cycle process, accumulating the sum of the equivalent cycle times under different discharge depths and calculating by combining the health state of the storage battery and the linear coefficient of the equivalent cycle times to obtain the real-time health state of the storage battery.
Compared with the prior art, the method has the advantages that the accumulated equivalent cycle life of the storage battery is calculated, so that the online detection of the health state of the storage battery is realized; and will update the SOH in real time t Correction calculation for SOC based on ampere-hour integration, storage by real-time updateThe SOC variation of each discharge cycle of the storage battery is calibrated and estimated according to the state of health of the storage battery, so that the estimation precision of the SOC is improved, and the SOH online detection accuracy is finally improved. Compared with the traditional SOH detection based on a complex mathematical model and an intelligent algorithm, the implementation strategy of the storage battery SOH online monitoring method is simple and reliable, and the method is a low-cost SOH monitoring solution.
Drawings
Fig. 1 is a flow chart of a method for online monitoring of SOH of a storage battery of a hybrid power supply system of an isolated base station according to an embodiment of the present invention;
fig. 2 is a schematic block diagram of an online storage battery SOH monitoring system of a hybrid power supply system of an isolated base station according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1, an embodiment of the present invention provides an online SOH monitoring method for a storage battery of an isolated base station hybrid power supply system, which includes the following steps:
s1, system power-on initialization.
The initialization parameters comprise state of health (SOH) of the storage battery 0 (ii) a Cycle life parameter N of a battery at a battery depth of discharge of 100% 100 At the same time, initializing the functional relation f of the discharge depth and the cycle life of the storage battery 1 (ii) a Initializing the functional relation f of the health state of the storage battery and the equivalent cycle number under the condition that the DoD is 100 percent in the depth of discharge 2 And its inverse function f 2 -1 (ii) a Processing the functional relation between the discharge depth and the cycle life of the storage battery into a linear relation; and processing the functional relation between the health state of the storage battery and the equivalent cycle number into a linear relation under the condition that the DOD is 100 percent.
And (3) related initialization parameters: n100, f 1 、f 2 Are all based on the supply of storage battery manufacturersThe related storage battery working condition test information can be obtained, correspondingly, the corresponding relation between the storage battery discharge depth and the cycle life and the relation between the storage battery health state and the equivalent cycle times under a certain discharge depth can also be obtained.
Specifically, based on the relevant battery working condition information provided by the battery manufacturer, the linear function relationship corresponding to the discharge depth and the cycle life of the storage battery is calculated through least square fitting:
N＝f 1 (DoD)；
and (3) calculating a linear function relation between the SOH and the equivalent cycle number CL of the storage battery under the condition that the DoD is 100% by a least square method:
SOH＝f 2 (CL 100 )
and its inverse function f 2 -1 。
And S2, regarding each discharging process of the storage battery as a complete cycle, and sampling the discharging current of the storage battery in each discharging process to obtain the discharging depth in the current cycle.
Sampling the current in each discharge period at intervals of n times at time intervals of Δ t =0.1s to obtain a sampled current I X (x =1,2 \ 8230n); considering the discharge process of the storage battery every time as a complete cycle period, the DOD is the discharge depth i The calculation formula of (a) is as follows:
Figure BDA0002850278030000041
DOD i ＝ΔSOC i
in the formula eta d Representing the discharge efficiency of the battery, C being the rated capacity of the battery, I being the instantaneous discharge current of the battery, SOH t Real-time calculation of the state of health, Δ SOC, of a battery during a current discharge cycle i Is the change of the SOC of the storage battery in the current discharging process. Calculating to obtain the SOC variation of the storage battery in the current discharge process, namely obtaining that the DOD is the discharge depth in the current cycle process i 。
And S3, calculating equivalent cycle times under corresponding discharge depths according to the discharge depths in the circulation process, accumulating the sum of the equivalent cycle times under different discharge depths, and calculating by combining the health state of the storage battery and a linear coefficient of the equivalent cycle times to obtain the real-time health state of the storage battery.
Namely, calculating the cycle life N corresponding to each discharge period i (i =1,2 \8230n) and unifies the cycle life at each depth of discharge to a reference value N 100 The calculation formula is as follows:
N i ＝f 1 (DOD i )
Figure BDA0002850278030000051
in the formula, L i Representing the equivalent cycle times corresponding to each discharge depth when the discharge depth is unified to the reference value;
the equivalent cycle number of the storage battery is the accumulated sum of the equivalent cycle numbers under different discharge depths, and the calculation formula of the equivalent cycle number of the storage battery in the operation life cycle is as follows:
Figure BDA0002850278030000052
the calculation formula of the real-time health state of the storage battery is as follows:
SOH t+1 ＝f 2 (L)。
the storage battery real-time state of health SOH t Updating once after each discharge period, and updating the SOH in real time t Correcting calculation of SOC based on ampere-hour integration method, and calculating real-time state of health (SOH) of storage battery in next discharge cycle by using corrected SOC t+1 。
The invention relates to an on-line monitoring method for the SOH of a storage battery of an isolated base station hybrid power supply system, which is used for realizing the on-line detection of the health state of the storage battery by calculating the accumulated equivalent cycle life of the storage battery; and will update the SOH in real time t ForThe SOC correction calculation based on the ampere-hour integration method calibrates and estimates the SOC variation of each discharge cycle of the storage battery through the real-time updated health state of the storage battery, so that the SOC estimation precision is improved, and the SOH online detection accuracy is finally improved. Compared with the traditional SOH detection based on a complex mathematical model and an intelligent algorithm, the implementation strategy of the storage battery SOH online monitoring method is simple and reliable, and the method is a low-cost SOH monitoring solution.
Based on the above method for monitoring the storage battery SOH of the isolated base station hybrid power supply system on line, the invention further provides an isolated base station hybrid power supply system storage battery SOH on-line monitoring system, as shown in fig. 2, which comprises the following functional modules:
the initialization module 10 is used for system power-on initialization;
the depth of discharge calculation module 20 is configured to regard each discharge process of the storage battery as a complete cycle period, and sample the discharge current of the storage battery in each discharge process to obtain the depth of discharge in the current cycle process;
the real-time state obtaining module 30 is configured to calculate equivalent cycle times at corresponding depth of discharge according to the depth of discharge in the cycle process, accumulate the sum of equivalent cycle times at different depths of discharge, and obtain the real-time health state of the storage battery by combining the linear coefficient between the health state of the storage battery and the equivalent cycle times.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the above embodiments, the description of each embodiment has its own emphasis, and reference may be made to the related description of other embodiments for parts that are not described or recited in any embodiment.
Those of ordinary skill in the art will appreciate that the modules, elements, and/or method steps of the various embodiments described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the technical solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (7)

1. An isolated base station hybrid power supply system storage battery SOH online monitoring method is characterized by comprising the following steps:
powering up and initializing a system;
each discharging process of the storage battery is regarded as a complete cycle period, and the discharging current of the storage battery is sampled in each discharging process to obtain the discharging depth in the current cycle process;
calculating equivalent cycle times under corresponding depth of discharge according to the depth of discharge in each current cycle process, accumulating the sum of equivalent cycle times under different depths of discharge, combining the linear coefficient of the health state of the storage battery and the equivalent cycle times, and accumulating the initial health state SOH of the storage battery 0 Calculating to obtain the real-time health state of the storage battery;
the method comprises the following steps of calculating equivalent cycle times under corresponding discharge depths according to the discharge depths in the circulation process, accumulating the sum of the equivalent cycle times under different discharge depths, and calculating by combining the linear coefficients of the health state and the equivalent cycle times of the storage battery to obtain the real-time health state of the storage battery, wherein the method comprises the following steps:
calculating the cycle life N corresponding to each discharge period i Wherein i =1,2 \ 8230n, andthe cycle life at each depth of discharge is unified to a reference value N 100 Wherein N100 represents a cycle life parameter of the battery when the depth of discharge of the battery is 100%, and the calculation formula is as follows:
N i ＝f 1 (DOD i )
Figure FDA0003784298500000011
in the formula, li represents the corresponding equivalent cycle times when each discharge depth is unified to a reference value; f1 represents a linear function relation corresponding to the discharge depth and the cycle life of the storage battery, namely a calculation formula of the cycle life of the storage battery under any discharge depth;
the calculation formula of the equivalent cycle number of the storage battery in the operation life cycle is as follows:
Figure FDA0003784298500000012
the calculation formula of the real-time health state of the storage battery is as follows:
SOH t+1 ＝f 2 (L)
in the formula, SOH 0 Representing the initial state of health of the storage battery; f. of 2 Represents: when the discharge depths are unified to 100%, the functional relationship between the health condition of the storage battery and the cycle number is realized; f. of 2 -1 Represents: and when the discharge depths are unified to be 100%, the functional relation between the current equivalent cycle times of the storage battery and the current health condition is realized.
2. The method for monitoring the storage battery SOH of the isolated base station hybrid power supply system according to claim 1, wherein the system is powered on and initialized, and the method comprises the following steps:
initializing battery state of health, SOH 0 (ii) a Initializing a cycle life parameter N of the battery at a battery depth of discharge of 100% 100 (ii) a Initializing a functional relationship between battery depth of discharge and cycle life(ii) a And initializing the functional relation between the health state of the storage battery and the equivalent cycle number and the inverse function thereof under the condition that the DOD is 100 percent.
3. The isolated base station hybrid power supply system storage battery SOH on-line monitoring method of claim 2, characterized in that a functional relationship between a storage battery depth of discharge and a cycle life is processed into a linear relationship; and processing the functional relation between the health state of the storage battery and the equivalent cycle number into a linear relation under the condition that the DOD is 100 percent.
4. The isolated base station hybrid power supply system storage battery SOH on-line monitoring method of claim 2, characterized in that,
and fitting and calculating a linear function relation corresponding to the discharge depth and the cycle life of the storage battery by a least square method:
N＝f 1 (DoD)；
and (3) calculating a linear function relation between the SOH and the equivalent cycle number CL of the storage battery under the condition that the DoD is 100% by a least square method:
SOH＝f 2 (CL 100 )
and its inverse function f 2 -1 。
5. The isolated base station hybrid power supply system storage battery SOH on-line monitoring method of claim 1, wherein the depth of discharge DOD i The calculation formula of (c) is as follows:
Figure FDA0003784298500000021
DOD i ＝ΔSOC i
in the formula eta d Representing the discharge efficiency of the battery, C being the rated capacity of the battery, I being the instantaneous discharge current of the battery, SOH t Calculating the value of the state of health, SOC, of the battery in real time during the current discharge cycle 0 For the health of the accumulator in the current discharge cycleInitial value of health, Δ SOC i D (t) represents the integral of the discharge current with respect to time, which is the amount of change in SOC of the battery during the current discharge.
6. The isolated base station hybrid power supply system storage battery SOH on-line monitoring method of claim 1, wherein,
and the real-time health state of the storage battery is updated once after each discharge cycle is finished, the real-time updated state is used for correction calculation based on an ampere-hour integral method, and the corrected state is used for calculating the real-time health state of the storage battery in the next discharge cycle.
7. A system adopted by the method for monitoring the storage battery SOH of the isolated base station hybrid power supply system according to any one of claims 1-6, characterized by comprising the following functional modules:
the initialization module is used for system power-on initialization;
the discharging depth calculation module is used for regarding each discharging process of the storage battery as a complete cycle period, and sampling the discharging current of the storage battery in each discharging process to obtain the discharging depth in the current cycle process;
a real-time state acquisition module for calculating equivalent cycle times under corresponding depth of discharge according to depth of discharge in each current cycle process, accumulating the sum of equivalent cycle times under different depth of discharge, combining the linear coefficient of the health state of the storage battery and the equivalent cycle times, and accumulating the initial health state SOH of the storage battery 0 And calculating to obtain the real-time health state of the storage battery.
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