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To obtain the state-of-charge (SOC) estimation value well, a second-order equivalent circuit model is selected as the research object. Aimed at the disadvantage that the recursive least squares method with a forgetting factor is easy to be disturbed by environmental factors such as noises in the parameter identification, a bias compensation recursive least squares method is proposed to realize the accurate identification of model parameters, and the SOC is estimated combined with the unscented Kalman filter algorithm. In view of the disadvantages of the unscented Kalman filter algorithm such as poor stability, the weight vectors are used to update the Kalman filter gain in the filter algorithm. Experimental results show that the total error of the proposed algorithm in estimating SOC was controlled within 2.7%, which verified the robustness and effectiveness of the algorithm.
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为更好地获得锂离子电池荷电状态 SOC(state-of-charge)估计值,选用二阶等效电路模型作为研究对象,针对带有遗忘因子的递推最小二乘法在参数辨识中易受到噪声等环境因素干扰的缺点,提出偏差补偿最小二乘法来实现模型参数的准确辨识,并结合无迹卡尔曼滤波算法对SOC进行估计。针对无迹卡尔曼滤波算法稳定性差等缺点,提出利用权重向量更新滤波算法中的卡尔曼滤波增益。实验结果表明,所提算法估计 SOC 的总误差可控制在2.7%以内,验证了算法的鲁棒性和有效性。
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王语园(1981-),男,通信作者,硕士,副教授。研究方向:电力电子与电力传动。E-mail:yuyuan2657@126.com。 |
安盼龙(1978-),男,硕士,副教授。研究方向:光电技术。E-mail:telecom_physics@163.com。
惠亮亮(1989-),男,硕士,讲师。研究方向:电能质量分析与控制。E-mail:huiliang19890228@163.com。
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王语园(1981-),男,通信作者,硕士,副教授。研究方向:电力电子与电力传动。E-mail:yuyuan2657@126.com。
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45(6): 711-735 (in Chinese)., articleTitle=Estimation of state of charge for lithium-ion battery based on multiinnovation recursive least square algorithm and unscented Kalman filter, refAbstract=null)], funds=[Fund(id=1154048193043095764, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154037271872398109, awardId=2021 JM-542, language=EN, fundingSource=Natural Science Basic Research Program of Shaanxi(2021 JM-542), fundOrder=null, country=null), Fund(id=1154048193097621717, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154037271872398109, awardId=2021 JM-542, language=CN, fundingSource=陕西省自然科学基础研究计划资助项目(2021 JM-542), fundOrder=null, country=null), Fund(id=1154048193160536278, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154037271872398109, awardId=STYKJ2022-4, language=EN, fundingSource=Weinan Science and Technology Plan Project(STYKJ2022-4), fundOrder=null, country=null), Fund(id=1154048193210867927, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154037271872398109, awardId=STYKJ2022-4, language=CN, fundingSource=渭南市重点研发科技计划项目(STYKJ2022-4), fundOrder=null, country=null), Fund(id=1154048193269588184, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154037271872398109, awardId=22JK0327, language=EN, fundingSource=General Special Scientific Research Projects of Education Department of Shaanxi Provincial Government(22JK0327), fundOrder=null, country=null), Fund(id=1154048193324114137, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154037271872398109, awardId=22JK0327, language=CN, fundingSource=陕西省教育厅一般专项科研计划项目(22JK0327), fundOrder=null, country=null), Fund(id=1154048193378640090, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154037271872398109, awardId=KJTD202104, language=EN, fundingSource=Power Quality Science and Technology Innovation Team Project of Shaanxi Railway Institute(KJTD202104), fundOrder=null, country=null), Fund(id=1154048193437360347, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154037271872398109, awardId=KJTD202104, language=CN, fundingSource=陕西铁路工程职业技术学院电能质量科技创新团队(KJTD202104), fundOrder=null, country=null), Fund(id=1154048193504469212, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154037271872398109, awardId=2023KYYB-18, language=EN, fundingSource=Scientific Research Fund Project of Shaanxi Railway Institute(2023KYYB-18), fundOrder=null, country=null), Fund(id=1154048193546412253, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154037271872398109, awardId=2023KYYB-18, language=CN, fundingSource=陕西铁路工程职业技术学院科研计划项目(2023KYYB-18), fundOrder=null, country=null)], companyList=[AuthorCompany(id=1154048187120738412, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154037271872398109, xref=null, ext=[AuthorCompanyExt(id=1154048187124932718, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154037271872398109, companyId=1154048187120738412, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=Railway Power Department Shaanxi Railway Institute Weinan 714000 China), AuthorCompanyExt(id=1154048187129127022, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154037271872398109, companyId=1154048187120738412, language=CN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=陕西铁路工程职业技术学院 铁道动力学院 渭南 714000)])], figs=[ArticleFig(id=1154048191356985509, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154037271872398109, language=EN, label=Fig. 1, caption=
Second-order equivalent circuit model, figureFileSmall=UkpfdhAyQEDiM8zJLbcsjw==, figureFileBig=qg5tkjNAbzgNCj4lMjaX8Q==, tableContent=null), ArticleFig(id=1154048191407317158, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154037271872398109, language=CN, label=图1, caption=
二阶等效电路模型, figureFileSmall=UkpfdhAyQEDiM8zJLbcsjw==, figureFileBig=qg5tkjNAbzgNCj4lMjaX8Q==, tableContent=null), ArticleFig(id=1154048191445065895, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154037271872398109, language=EN, label=Fig. 2, caption=
Flow chart of parameter identification based on BCRLS algorithm, figureFileSmall=scmdFehUQKnTEMcwRh/M+Q==, figureFileBig=AQaDACO3OAfhEQjfQIhqyA==, tableContent=null), ArticleFig(id=1154048191499591848, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154037271872398109, language=CN, label=图2, caption=
基于 BCRLS 算法的参数辨识流程, figureFileSmall=scmdFehUQKnTEMcwRh/M+Q==, figureFileBig=AQaDACO3OAfhEQjfQIhqyA==, tableContent=null), ArticleFig(id=1154048191545729193, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154037271872398109, language=EN, label=Fig. 3, caption=
Flow chart of SOC estimation based on improved UKF method, figureFileSmall=WELkEo1c34JmsJxAxbqBGg==, figureFileBig=xGqi1aGDQS+tNhhqIVXIRw==, tableContent=null), ArticleFig(id=1154048191608643755, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154037271872398109, language=CN, label=图3, caption=
基于改进的 UKF 算法的 SOC 估计流程, figureFileSmall=WELkEo1c34JmsJxAxbqBGg==, figureFileBig=xGqi1aGDQS+tNhhqIVXIRw==, tableContent=null), ArticleFig(id=1154048191675752621, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154037271872398109, language=EN, label=Fig. 4, caption=
Experimental data of battery under BJDST working condition test, figureFileSmall=3uk3t6+x3Ei75gzUmLjcDw==, figureFileBig=5zs+n05Yn9u45c5RJ1Spmw==, tableContent=null), ArticleFig(id=1154048191747055792, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154037271872398109, language=CN, label=图4, caption=
电池在 BJDST 工况测试下的实验数据, figureFileSmall=3uk3t6+x3Ei75gzUmLjcDw==, figureFileBig=5zs+n05Yn9u45c5RJ1Spmw==, tableContent=null), ArticleFig(id=1154048191801581746, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154037271872398109, language=EN, label=Fig. 5, caption=
Estimation results and corresponding errors of voltage and SOC under BJDST working condition, figureFileSmall=pkHn5eC4wfWm/k4dxThFvg==, figureFileBig=HaPb+tMgRoDMgR8bn+UDSQ==, tableContent=null), ArticleFig(id=1154048191856107701, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154037271872398109, language=CN, label=图5, caption=
BJDST 工况下电压和 SOC 的估计结果和相应误差, figureFileSmall=pkHn5eC4wfWm/k4dxThFvg==, figureFileBig=HaPb+tMgRoDMgR8bn+UDSQ==, tableContent=null), ArticleFig(id=1154048191910633655, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154037271872398109, language=EN, label=Fig. 6, caption=
Experimental data of battery under US06 working condition test, figureFileSmall=EwQ0sSQlP0tSsaY5haEpIw==, figureFileBig=trfQYmuwzP5xwK3nUenxOQ==, tableContent=null), ArticleFig(id=1154048191986131130, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154037271872398109, language=CN, label=图6, caption=
电池在 US06 工况测试下的实验数据, figureFileSmall=EwQ0sSQlP0tSsaY5haEpIw==, figureFileBig=trfQYmuwzP5xwK3nUenxOQ==, tableContent=null), ArticleFig(id=1154048192032268475, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154037271872398109, language=EN, label=Fig. 7, caption=
Estimation results and corresponding errors of voltage and SOC under US06 working condition, figureFileSmall=DKPVC2n9AHv/8pv5Os/yjA==, figureFileBig=oTFLl6eVck4nUFxa8ZcYZw==, tableContent=null), ArticleFig(id=1154048192082600124, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154037271872398109, language=CN, label=图7, caption=
US06 工况下电压和 SOC 的估计结果和相应误差, figureFileSmall=DKPVC2n9AHv/8pv5Os/yjA==, figureFileBig=oTFLl6eVck4nUFxa8ZcYZw==, tableContent=null), ArticleFig(id=1154048192187457725, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154037271872398109, language=EN, label=Tab. 1, caption=
Parameter identification results of different algorithms, figureFileSmall=null, figureFileBig=null, tableContent=
| 算法 | SOC/% | ${R}_{0}/\Omega$ | ${R}_{1}/\Omega$ | ${R}_{2}/\Omega$ | ${C}_{1}/\mathrm{F}$ | ${C}_{2}/\mathrm{F}$ |
| FFRLS | 30 | 0.071 | 0.028 | 0.062 | 67.01 | 312.22 |
| 50 | 0.065 | 0.023 | 0.084 | 70.13 | 379.24 |
| 70 | 0.058 | 0.025 | 0.072 | 51.13 | 343.21 |
| BCRLS | 30 | 0.07 | 0.036 | 0.073 | 76.32 | 304.78 |
| 50 | 0.063 | 0.033 | 0.091 | 62.67 | 297.32 |
| 70 | 0.059 | 0.044 | 0.082 | 43.59 | 361.11 |
), ArticleFig(id=1154048192267149502, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154037271872398109, language=CN, label=表1, caption=
不同算法的参数辨识结果, figureFileSmall=null, figureFileBig=null, tableContent=
| 算法 | SOC/% | ${R}_{0}/\Omega$ | ${R}_{1}/\Omega$ | ${R}_{2}/\Omega$ | ${C}_{1}/\mathrm{F}$ | ${C}_{2}/\mathrm{F}$ |
| FFRLS | 30 | 0.071 | 0.028 | 0.062 | 67.01 | 312.22 |
| 50 | 0.065 | 0.023 | 0.084 | 70.13 | 379.24 |
| 70 | 0.058 | 0.025 | 0.072 | 51.13 | 343.21 |
| BCRLS | 30 | 0.07 | 0.036 | 0.073 | 76.32 | 304.78 |
| 50 | 0.063 | 0.033 | 0.091 | 62.67 | 297.32 |
| 70 | 0.059 | 0.044 | 0.082 | 43.59 | 361.11 |
), ArticleFig(id=1154048192321675455, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154037271872398109, language=EN, label=Tab. 2, caption=
Model based on different variables, figureFileSmall=null, figureFileBig=null, tableContent=
| 模型 | 变量 |
| UKF1 | FFRLS |
| UKF2 | BCRLS |
| UKF3 | BCRLS+改进的 UKF 算法 |
), ArticleFig(id=1154048192384590016, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154037271872398109, language=CN, label=表2, caption=
基于不同变量的模型, figureFileSmall=null, figureFileBig=null, tableContent=
| 模型 | 变量 |
| UKF1 | FFRLS |
| UKF2 | BCRLS |
| UKF3 | BCRLS+改进的 UKF 算法 |
), ArticleFig(id=1154048192451698881, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154037271872398109, language=EN, label=Tab. 3, caption=
Estimated terminal voltage and SOC under BJDST working condition, figureFileSmall=null, figureFileBig=null, tableContent=
| 算法 | SOC | 端电压 (MAE)/% V |
| MAE/% | RMSE/% |
| UKF1 | 3.01 | 2.06 | 3.89 |
| UKF2 | 2.72 | 1.98 | 3.54 |
| UKF3 | 2.36 | 1.75 | 3.01 |
), ArticleFig(id=1154048192527196355, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154037271872398109, language=CN, label=表3, caption=
BJDST 工况下的端电压和 SOC 估计值, figureFileSmall=null, figureFileBig=null, tableContent=
| 算法 | SOC | 端电压 (MAE)/% V |
| MAE/% | RMSE/% |
| UKF1 | 3.01 | 2.06 | 3.89 |
| UKF2 | 2.72 | 1.98 | 3.54 |
| UKF3 | 2.36 | 1.75 | 3.01 |
), ArticleFig(id=1154048192598499527, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154037271872398109, language=EN, label=Tab. 4, caption=
Estimated terminal voltage and SOC under US06 working condition, figureFileSmall=null, figureFileBig=null, tableContent=
| 算法 | SOC | 端电压 (MAE)/% V |
| MAE/% | RMSE/% |
| UKF1 | 3.15 | 2.11 | 5.04 |
| UKF2 | 2.88 | 2.02 | 4.51 |
| UKF3 | 2.67 | 1.84 | 4.45 |
), ArticleFig(id=1154048192657219785, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154037271872398109, language=CN, label=表4, caption=
US06 工况下的端电压和 SOC 估计值, figureFileSmall=null, figureFileBig=null, tableContent=
| 算法 | SOC | 端电压 (MAE)/% V |
| MAE/% | RMSE/% |
| UKF1 | 3.15 | 2.11 | 5.04 |
| UKF2 | 2.88 | 2.02 | 4.51 |
| UKF3 | 2.67 | 1.84 | 4.45 |
), ArticleFig(id=1154048192728522955, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154037271872398109, language=EN, label=Tab. 5, caption=
Comparison between proposed SOC estimation method and existing methods, figureFileSmall=null, figureFileBig=null, tableContent=
| 算法 | 测试电池 | SOC 估计误差 |
| LSTM+RNN[11] | 18650 LIB | MAE<2.09% RMSE<2.44% |
| $\mathrm{{EKF}}+ {\mathrm{{NN}}}^{\left\lbrack {12}\right\rbrack }$ | LiFePO4 | MAE<4% |
| EKF+RLS [13 ] | LIB | MAE<3% |
| UKF+FFMILS [14 ] | LIB | RMSE<2% |
| UKF+BCRLS | | BJDST:RMSE=1.75% |
| (所提方法) | LIB | US06:RMSE=1.84% |
), ArticleFig(id=1154048192791437519, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154037271872398109, language=CN, label=表5, caption=
所提 SOC 估计方法与现有方法的对比, figureFileSmall=null, figureFileBig=null, tableContent=
| 算法 | 测试电池 | SOC 估计误差 |
| LSTM+RNN[11] | 18650 LIB | MAE<2.09% RMSE<2.44% |
| $\mathrm{{EKF}}+ {\mathrm{{NN}}}^{\left\lbrack {12}\right\rbrack }$ | LiFePO4 | MAE<4% |
| EKF+RLS [13 ] | LIB | MAE<3% |
| UKF+FFMILS [14 ] | LIB | RMSE<2% |
| UKF+BCRLS | | BJDST:RMSE=1.75% |
| (所提方法) | LIB | US06:RMSE=1.84% |
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