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In order to improve the efficiency of identification and diagnosis of distribution network line faults and improve the reliability of power supply, this paper adopts a method based on wavelet entropy to construct a distribution network line operating condition characteristic gene bank. Firstly, the distribution network line simulation model is built to extract the operation data, and then, combined with the effective simulation data, the feature extraction algorithm model based on wavelet entropy is built, and finally, the characteristic gene bank is developed based on the feature data. The simulation results show that the feature extraction algorithm and characteristic gene bank based on wavelet entropy can effectively identify and diagnose a variety of operating conditions of distribution network lines, which meets the requirements of sustainable development of distribution network.
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为了提高对配电网线路故障的识别诊断效率,提升供电可靠性,本文采用一种基于小波熵的配电网线路运行工况特征基因库构建方法。首先,搭建配电网线路仿真模型;然后,提取各工况运行数据,搭建基于小波熵的特征提取算法模型;最后,基于特征数据开发特征基因库。仿真结果表明,基于小波熵的特征提取算法和特征基因库能有效地识别与诊断配电网线路的多种运行工况,满足配电网可持续发展的要求。
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王良锋(2002—),男,广东茂名人,本科生,研究方向为AI在智能配电网领域的应用。
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王良锋(2002—),男,广东茂名人,本科生,研究方向为AI在智能配电网领域的应用。
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40(9): 68-71., articleTitle=基于能量特征的配电网接地故障暂态选线方法研究, refAbstract=null)], funds=[Fund(id=1194318738116800975, tenantId=1146029695717560320, journalId=1190235702286704641, articleId=1194266549084189666, awardId=62006052, language=CN, fundingSource=国家自然科学基金-青年科学基金项目(62006052), fundOrder=null, country=null), Fund(id=1194318738179715536, tenantId=1146029695717560320, journalId=1190235702286704641, articleId=1194266549084189666, awardId=202102020663, language=CN, fundingSource=广州市科技计划项目(202102020663), fundOrder=null, country=null), Fund(id=1194318738259407313, tenantId=1146029695717560320, journalId=1190235702286704641, articleId=1194266549084189666, awardId=2019KY046, language=CN, fundingSource=配网设备快速运维关键技术研究(2019KY046), fundOrder=null, country=null), Fund(id=1194318738351682002, tenantId=1146029695717560320, journalId=1190235702286704641, articleId=1194266549084189666, awardId=2022KCJYS012, language=CN, fundingSource=广州市高等教育教学质量与教学改革工程课程教研室项目(2022KCJYS012), fundOrder=null, country=null), Fund(id=1194318738414596563, tenantId=1146029695717560320, journalId=1190235702286704641, articleId=1194266549084189666, awardId=S20240138, language=CN, fundingSource=大学生创新创业训练计划项目(S20240138), fundOrder=null, country=null)], companyList=[AuthorCompany(id=1194318731716293003, tenantId=1146029695717560320, journalId=1190235702286704641, articleId=1194266549084189666, xref=null, ext=[AuthorCompanyExt(id=1194318731724681612, tenantId=1146029695717560320, journalId=1190235702286704641, articleId=1194266549084189666, companyId=1194318731716293003, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=School of Low Altitude Equipment and Intelligent Control, Guangzhou University of Navigation, Guangzhou 510700), AuthorCompanyExt(id=1194318731733070221, tenantId=1146029695717560320, journalId=1190235702286704641, articleId=1194266549084189666, companyId=1194318731716293003, language=CN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=广州航海学院低空装备与智能控制学院, 广州 510700)])], figs=[ArticleFig(id=1194318734698443183, tenantId=1146029695717560320, journalId=1190235702286704641, articleId=1194266549084189666, language=EN, label=null, caption=null, figureFileSmall=ktBAKMdfWvAFHFJu8WUljQ==, figureFileBig=cXNT77fO1IkUD30ttGeUDQ==, tableContent=null), ArticleFig(id=1194318734782329264, tenantId=1146029695717560320, journalId=1190235702286704641, articleId=1194266549084189666, language=CN, label=图1, caption=
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信号s2(t)的WEE值仿真结果, figureFileSmall=djQf4Qwjh4RGFMffYanDqA==, figureFileBig=0/5D/byD8oTBpvMaVXMfcA==, tableContent=null), ArticleFig(id=1194318735419863479, tenantId=1146029695717560320, journalId=1190235702286704641, articleId=1194266549084189666, language=EN, label=null, caption=null, figureFileSmall=T0iEksPmI5vWluBpqLgWOA==, figureFileBig=FtamiTYMq5PYbXacAZRBRw==, tableContent=null), ArticleFig(id=1194318735482778040, tenantId=1146029695717560320, journalId=1190235702286704641, articleId=1194266549084189666, language=CN, label=图5, caption=
特征提取算法流程, figureFileSmall=T0iEksPmI5vWluBpqLgWOA==, figureFileBig=FtamiTYMq5PYbXacAZRBRw==, tableContent=null), ArticleFig(id=1194318735554081209, tenantId=1146029695717560320, journalId=1190235702286704641, articleId=1194266549084189666, language=EN, label=null, caption=null, figureFileSmall=null, figureFileBig=null, tableContent=
| 参数 | 数值 |
| 采样频率/Hz | 0~2 000 |
| 小波基函数 | db10 |
| 最大分解尺度J | 4 |
| 窗口移动范围/s | 0.02 |
| 时间窗口宽度/s | 0.02 |
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小波熵特征提取算法模型参数
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| 参数 | 数值 |
| 采样频率/Hz | 0~2 000 |
| 小波基函数 | db10 |
| 最大分解尺度J | 4 |
| 窗口移动范围/s | 0.02 |
| 时间窗口宽度/s | 0.02 |
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| 影响因素 | 条件 | WEE值 |
| 信号幅值突变 | 较小 | 较小 |
| 较大 | 较大 |
| 信号频率成分 | 单一 | 较小 |
| 丰富 | 较大 |
| 小波最大分解尺度 | 较小 | 较小 |
| 较大 | 较大 |
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信号仿真结果分析
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| 影响因素 | 条件 | WEE值 |
| 信号幅值突变 | 较小 | 较小 |
| 较大 | 较大 |
| 信号频率成分 | 单一 | 较小 |
| 丰富 | 较大 |
| 小波最大分解尺度 | 较小 | 较小 |
| 较大 | 较大 |
), ArticleFig(id=1194318735805739453, tenantId=1146029695717560320, journalId=1190235702286704641, articleId=1194266549084189666, language=EN, label=null, caption=null, figureFileSmall=null, figureFileBig=null, tableContent=
| 运行状态 | WEE值变化情况 |
| 故障相 | 非故障相 |
| 正常运行 | 基本不变 | 基本不变 |
| 三相短路故障 | 突变较大 | 突变较大 |
| 两相短路故障 | 突变较大 | 基本不变 |
| 两相接地短路故障 | 突变较大 | 突变较小 |
| 单相接地故障 | 突变较大 | 突变较小 |
), ArticleFig(id=1194318735872848318, tenantId=1146029695717560320, journalId=1190235702286704641, articleId=1194266549084189666, language=CN, label=表3, caption=
故障瞬间电压与电流WEE值变化情况
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| 运行状态 | WEE值变化情况 |
| 故障相 | 非故障相 |
| 正常运行 | 基本不变 | 基本不变 |
| 三相短路故障 | 突变较大 | 突变较大 |
| 两相短路故障 | 突变较大 | 基本不变 |
| 两相接地短路故障 | 突变较大 | 突变较小 |
| 单相接地故障 | 突变较大 | 突变较小 |
), ArticleFig(id=1194318735944151487, tenantId=1146029695717560320, journalId=1190235702286704641, articleId=1194266549084189666, language=EN, label=null, caption=null, figureFileSmall=null, figureFileBig=null, tableContent=
| 特征代码 | 仿真计算结果 | 现场计算结果 |
| 0.010 7 | 0.018 4 |
| 0.001 4 | 0.016 6 |
| 0.014 8 | 0.002 2 |
| EA/V | 320.382 0 | 273.370 0 |
| EB/V | 320.911 0 | 266.969 0 |
| EC/V | 320.400 0 | 278.164 0 |
| u0/V | 0 | 0 |
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正常运行工况的计算结果
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| 特征代码 | 仿真计算结果 | 现场计算结果 |
| 0.010 7 | 0.018 4 |
| 0.001 4 | 0.016 6 |
| 0.014 8 | 0.002 2 |
| EA/V | 320.382 0 | 273.370 0 |
| EB/V | 320.911 0 | 266.969 0 |
| EC/V | 320.400 0 | 278.164 0 |
| u0/V | 0 | 0 |
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| 特征代码 | 仿真计算结果 | 现场计算结果 |
| 0.031 2 | 0.041 3 |
| 0.094 6 | 0.020 1 |
| 0.081 7 | 0.036 9 |
| EA/V | 121.867 0 | 247.469 0 |
| EB/V | 121.580 0 | 230.138 0 |
| EC/V | 121.430 0 | 174.863 0 |
| u0/V | 0 | 0 |
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三相短路故障工况的计算结果
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| 特征代码 | 仿真计算结果 | 现场计算结果 |
| 0.031 2 | 0.041 3 |
| 0.094 6 | 0.020 1 |
| 0.081 7 | 0.036 9 |
| EA/V | 121.867 0 | 247.469 0 |
| EB/V | 121.580 0 | 230.138 0 |
| EC/V | 121.430 0 | 174.863 0 |
| u0/V | 0 | 0 |
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| 特征代码 | 仿真计算结果 | 现场计算结果 |
| /nat | 0.044 2 | 0.019 6 |
| /nat | 0.035 1 | 0.024 8 |
| /nat | 0.014 8 | 0.015 0 |
| EA/V | 173.124 0 | 234.984 0 |
| EB/V | 168.007 0 | 256.828 0 |
| EC/V | 320.275 0 | 304.360 0 |
| u0/V | 0 | 0 |
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两相短路故障工况的计算结果
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| 特征代码 | 仿真计算结果 | 现场计算结果 |
| /nat | 0.044 2 | 0.019 6 |
| /nat | 0.035 1 | 0.024 8 |
| /nat | 0.014 8 | 0.015 0 |
| EA/V | 173.124 0 | 234.984 0 |
| EB/V | 168.007 0 | 256.828 0 |
| EC/V | 320.275 0 | 304.360 0 |
| u0/V | 0 | 0 |
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| 特征代码 | 仿真计算结果 | 现场计算结果 |
| 0.031 0 | 0.072 3 |
| 0.095 8 | 0.064 8 |
| 0.013 4 | 0.099 5 |
| EA/V | 121.470 0 | 143.919 0 |
| EB/V | 121.338 0 | 144.621 0 |
| EC/V | 270.827 0 | 162.926 0 |
| u0/V | 7 893.469 8 | 0 |
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两相接地短路故障工况的计算结果
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| 特征代码 | 仿真计算结果 | 现场计算结果 |
| 0.031 0 | 0.072 3 |
| 0.095 8 | 0.064 8 |
| 0.013 4 | 0.099 5 |
| EA/V | 121.470 0 | 143.919 0 |
| EB/V | 121.338 0 | 144.621 0 |
| EC/V | 270.827 0 | 162.926 0 |
| u0/V | 7 893.469 8 | 0 |
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| 特征代码 | 仿真计算结果 | 现场计算结果 |
| 0.031 6 | 0.040 2 |
| 0.002 3 | 0.016 0 |
| 0.013 7 | 0.009 5 |
| EA/V | 120.845 0 | 180.046 0 |
| EB/V | 269.718 0 | 270.591 0 |
| EC/V | 278.171 5 | 296.735 0 |
| u0/V | 8 415.796 7 | 895.470 3 |
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单相接地故障工况的计算结果
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| 特征代码 | 仿真计算结果 | 现场计算结果 |
| 0.031 6 | 0.040 2 |
| 0.002 3 | 0.016 0 |
| 0.013 7 | 0.009 5 |
| EA/V | 120.845 0 | 180.046 0 |
| EB/V | 269.718 0 | 270.591 0 |
| EC/V | 278.171 5 | 296.735 0 |
| u0/V | 8 415.796 7 | 895.470 3 |
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| 基因 | 片段1 | 片段2 | … | 片段n |
| 基因1 | N11 | N12 | … | N1n |
| 基因2 | N21 | N22 | … | N2n |
| | | | |
| 基因m | Nm1 | Nm2 | … | Nmn |
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特征基因库
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| 基因 | 片段1 | 片段2 | … | 片段n |
| 基因1 | N11 | N12 | … | N1n |
| 基因2 | N21 | N22 | … | N2n |
| | | | |
| 基因m | Nm1 | Nm2 | … | Nmn |
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| 规则号 | 运行状态 | 规则条件 | 优先级别 |
| 1 | 正常运行 | (EA>ξ1, EB>ξ1, EC>ξ1)||(<ξ2, <ξ2, <ξ2&&(u0<ξ3) | 0 |
| 2 | 三相短路 | (EA<ξ1, EB<ξ1, EC<ξ1&&(>ξ2, >ξ2, >ξ2)&&(u0<ξ3) | 1 |
| 3 | A相单相接地短路 | ((EA<ξ1&&(EB>ξ1, EC>ξ1&&((>ξ2)&&(<ξ2, <ξ2&&(u0>ξ3) | 2 |
| 4 | AB两相短路 | ((EA<ξ1, EB<ξ1&&(EC>ξ1&&((>ξ2, >ξ2)&&(<ξ2&&(u0<ξ3) | 3 |
| 5 | AB两相接地短路 | ((EA<ξ1, EB<ξ1&&(EC>ξ1&&((>ξ2, >ξ2)&&(<ξ2&&(u0>ξ3) | 4 |
| 6 | 其他工况 | 除以上组合之外的情况 | 5 |
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基因匹配规则
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| 规则号 | 运行状态 | 规则条件 | 优先级别 |
| 1 | 正常运行 | (EA>ξ1, EB>ξ1, EC>ξ1)||(<ξ2, <ξ2, <ξ2&&(u0<ξ3) | 0 |
| 2 | 三相短路 | (EA<ξ1, EB<ξ1, EC<ξ1&&(>ξ2, >ξ2, >ξ2)&&(u0<ξ3) | 1 |
| 3 | A相单相接地短路 | ((EA<ξ1&&(EB>ξ1, EC>ξ1&&((>ξ2)&&(<ξ2, <ξ2&&(u0>ξ3) | 2 |
| 4 | AB两相短路 | ((EA<ξ1, EB<ξ1&&(EC>ξ1&&((>ξ2, >ξ2)&&(<ξ2&&(u0<ξ3) | 3 |
| 5 | AB两相接地短路 | ((EA<ξ1, EB<ξ1&&(EC>ξ1&&((>ξ2, >ξ2)&&(<ξ2&&(u0>ξ3) | 4 |
| 6 | 其他工况 | 除以上组合之外的情况 | 5 |
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| 状态 | 说明 |
| EA<ξ1 | A相电压信号有突变或含有高频分量 |
| EA>ξ1 | A相电压信号无故障或突变较小 |
| >ξ2 | A相电压信号有突变或含有高频分量 |
| <ξ2 | A相电压信号无故障或突变较小 |
| u0≠ξ3 | 零序电压幅值较大 |
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特征向量的对应状态及说明
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| 状态 | 说明 |
| EA<ξ1 | A相电压信号有突变或含有高频分量 |
| EA>ξ1 | A相电压信号无故障或突变较小 |
| >ξ2 | A相电压信号有突变或含有高频分量 |
| <ξ2 | A相电压信号无故障或突变较小 |
| u0≠ξ3 | 零序电压幅值较大 |
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