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A small-signal stability preventive control method based on convolutional neural network (CNN) sensitivity analysis is presented in the paper, to improve the developing speed of small- signal stability preventive control measures. For poor or negative damping low frequency oscillation modes (i.e., the damping ratios are smaller than a threshold), first, an optimization model with small- signal stability constraints is established; second, the sensitivities of the damping ratios with respect to control variables (the active power of adjustable generators) based on CNN model of damping ratio prediction are calculated and then the optimization model is transformed into a quadratic programming model by linearizing small-signal stability constraints through sensitivities; finally, the adjustment amounts of generator active power are obtained. Several iterations are needed to make the damping ratios meet specific requirements. Analysis results of WEPRI 36-node case show that the effective control measures can be obtained by the presented method, which is more precise than that of the support vector machine method. The computing speed of the presented method is faster than that of the traditional eigenvalue analysis method. The ideas presented in this paper can also be applied to transient stability preventive control.
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为了提升小干扰稳定预防控制措施制定的速度,本文提出基于卷积神经网络(CNN)灵敏度分析的小干扰稳定预防控制方法。针对系统中存在的若干弱负阻尼(阻尼比小于某一阈值)低频振荡模式,首先建立带小干扰稳定约束的优化模型,其次基于CNN阻尼比预测模型计算阻尼比相对于控制变量(可调发电机的有功功率)的灵敏度,通过灵敏度将小干扰稳定约束线性化,从而将优化模型转化为二次规划模型,最终得到发电机的有功功率调整量,通过多次迭代使阻尼比满足特定要求。WEPRI36节点算例分析结果表明,由CNN模型得到的控制措施十分有效,且较支持向量机模型更精准,控制措施制定的速度较传统特征值分析法快。本文研究思路也可用于暂态稳定预防控制。
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1 State Key Laboratory of Power Grid Safety, Beijing 100192), AuthorCompanyExt(id=1194653301946950041, tenantId=1146029695717560320, journalId=1190235702286704641, articleId=1194580236286263915, companyId=1194653301934367127, language=CN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=
1 电网安全全国重点实验室,北京 100192)]), AuthorCompany(id=1194653301997281690, tenantId=1146029695717560320, journalId=1190235702286704641, articleId=1194580236286263915, xref=2, ext=[AuthorCompanyExt(id=1194653302001475995, tenantId=1146029695717560320, journalId=1190235702286704641, articleId=1194580236286263915, companyId=1194653301997281690, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=
2 China Electric Power Research Institute, Beijing 100192), AuthorCompanyExt(id=1194653302009864604, tenantId=1146029695717560320, journalId=1190235702286704641, articleId=1194580236286263915, companyId=1194653301997281690, language=CN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=
2 中国电力科学研究院,北京 100192)])], figs=[ArticleFig(id=1194653304652276154, tenantId=1146029695717560320, journalId=1190235702286704641, articleId=1194580236286263915, language=EN, label=null, caption=null, figureFileSmall=WLxPm1k2JyR/7bLaNVERjA==, figureFileBig=vuRYVccaoqcCrS1jhQBcdg==, tableContent=null), ArticleFig(id=1194653304706802107, tenantId=1146029695717560320, journalId=1190235702286704641, articleId=1194580236286263915, language=CN, label=图1, caption=
基于CNN的小干扰稳定评估流程, figureFileSmall=WLxPm1k2JyR/7bLaNVERjA==, figureFileBig=vuRYVccaoqcCrS1jhQBcdg==, tableContent=null), ArticleFig(id=1194653304803271100, tenantId=1146029695717560320, journalId=1190235702286704641, articleId=1194580236286263915, language=EN, label=null, caption=null, figureFileSmall=vE5JoQzxrq4VBk8ZJSv9hA==, figureFileBig=vmOSI9jHBa/ko+91VOferg==, tableContent=null), ArticleFig(id=1194653304861991357, tenantId=1146029695717560320, journalId=1190235702286704641, articleId=1194580236286263915, language=CN, label=图2, caption=
CNN模型结构示意图, figureFileSmall=vE5JoQzxrq4VBk8ZJSv9hA==, figureFileBig=vmOSI9jHBa/ko+91VOferg==, tableContent=null), ArticleFig(id=1194653304933294526, tenantId=1146029695717560320, journalId=1190235702286704641, articleId=1194580236286263915, language=EN, label=null, caption=null, figureFileSmall=jEsqOlIp6jte+tko5gIdCw==, figureFileBig=+ak8thDPJEidHC62G7TWKw==, tableContent=null), ArticleFig(id=1194653305021374911, tenantId=1146029695717560320, journalId=1190235702286704641, articleId=1194580236286263915, language=CN, label=图3, caption=
基于CNN的小干扰稳定预防控制流程, figureFileSmall=jEsqOlIp6jte+tko5gIdCw==, figureFileBig=+ak8thDPJEidHC62G7TWKw==, tableContent=null), ArticleFig(id=1194653305105260992, tenantId=1146029695717560320, journalId=1190235702286704641, articleId=1194580236286263915, language=EN, label=null, caption=null, figureFileSmall=1oOLHX3bv11dDHiAQPNQUg==, figureFileBig=mfWwJ2UlEFgRgceaU0artg==, tableContent=null), ArticleFig(id=1194653305176564161, tenantId=1146029695717560320, journalId=1190235702286704641, articleId=1194580236286263915, language=CN, label=图4, caption=
阻尼比灵敏度计算结果(模式6), figureFileSmall=1oOLHX3bv11dDHiAQPNQUg==, figureFileBig=mfWwJ2UlEFgRgceaU0artg==, tableContent=null), ArticleFig(id=1194653305247867330, tenantId=1146029695717560320, journalId=1190235702286704641, articleId=1194580236286263915, language=EN, label=null, caption=null, figureFileSmall=VCQ8zTJWFSk/aupPwQ+gsw==, figureFileBig=1QguggAapk5tf3gwyrDy0A==, tableContent=null), ArticleFig(id=1194653305319170499, tenantId=1146029695717560320, journalId=1190235702286704641, articleId=1194580236286263915, language=CN, label=图5, caption=
阻尼比灵敏度计算结果(模式7), figureFileSmall=VCQ8zTJWFSk/aupPwQ+gsw==, figureFileBig=1QguggAapk5tf3gwyrDy0A==, tableContent=null), ArticleFig(id=1194653305386279364, tenantId=1146029695717560320, journalId=1190235702286704641, articleId=1194580236286263915, language=EN, label=null, caption=null, figureFileSmall=null, figureFileBig=null, tableContent=
| 模式 | 放大10倍 | 放大100倍 | 放大1 000倍 | 归一化 |
| 6 | 1.901 1×10-6 | 1.785 2×10-6 | 1.806 3×10-6 | 2.244 1×10-6 |
| 7 | 1.740 0×10-5 | 1.531 4×10-5 | 1.620 6×10-5 | 1.746 7×10-5 |
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不同输出量数值变换方式下阻尼比预测方均误差对比
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| 模式 | 放大10倍 | 放大100倍 | 放大1 000倍 | 归一化 |
| 6 | 1.901 1×10-6 | 1.785 2×10-6 | 1.806 3×10-6 | 2.244 1×10-6 |
| 7 | 1.740 0×10-5 | 1.531 4×10-5 | 1.620 6×10-5 | 1.746 7×10-5 |
), ArticleFig(id=1194653305537274310, tenantId=1146029695717560320, journalId=1190235702286704641, articleId=1194580236286263915, language=EN, label=null, caption=null, figureFileSmall=null, figureFileBig=null, tableContent=
| 模式 | CNN | SVM |
| 6 | 1.785 2×10-6 | 2.418 4×10-6 |
| 7 | 1.531 4×10-5 | 2.470 1×10-5 |
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CNN和SVM模型阻尼比预测方均误差对比
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| 模式 | CNN | SVM |
| 6 | 1.785 2×10-6 | 2.418 4×10-6 |
| 7 | 1.531 4×10-5 | 2.470 1×10-5 |
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| 模式 | 特征值 | 频率/Hz | 阻尼比/% |
| 1 | -6.275 690±j14.812 546 | 2.306 8 | 39.010 6 |
| 2 | -0.817 326±j10.793 026 | 1.717 8 | 7.551 1 |
| 3 | -0.898 058±j10.083 064 | 1.604 8 | 8.871 5 |
| 4 | -0.601 877±j7.969 109 | 1.268 3 | 7.531 2 |
| 5 | -0.916 152±j6.821 952 | 1.085 7 | 13.310 0 |
| 6 | -0.237 418±j6.040 493 | 0.961 4 | 3.927 4 |
| 7 | -0.110 139±j4.609 116 | 0.733 6 | 2.388 9 |
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频域仿真结果
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| 模式 | 特征值 | 频率/Hz | 阻尼比/% |
| 1 | -6.275 690±j14.812 546 | 2.306 8 | 39.010 6 |
| 2 | -0.817 326±j10.793 026 | 1.717 8 | 7.551 1 |
| 3 | -0.898 058±j10.083 064 | 1.604 8 | 8.871 5 |
| 4 | -0.601 877±j7.969 109 | 1.268 3 | 7.531 2 |
| 5 | -0.916 152±j6.821 952 | 1.085 7 | 13.310 0 |
| 6 | -0.237 418±j6.040 493 | 0.961 4 | 3.927 4 |
| 7 | -0.110 139±j4.609 116 | 0.733 6 | 2.388 9 |
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| 发电机 | 功率调整量/p.u. |
| CNN方法 | SVM方法 | 特征值分析法 |
| G2 | 0.226 127 | 0.284 712 | 0.215 456 |
| G3 | 0.020 204 | 0.029 757 | 0.046 209 |
| G4 | 0.023 456 | 0.021 518 | 0.027 972 |
| G5 | -0.164 089 | -0.097 194 | -0.229 513 |
| G6 | 0.110 000 | 0.110 000 | 0.110 000 |
| G7 | -0.200 761 | -0.254 553 | -0.190 640 |
| G8 | -0.234 143 | -0.292 556 | -0.195 847 |
| 下调功率总量/p.u. | 0.598 993 | 0.644 303 | 0.616 000 |
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控制措施
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| 发电机 | 功率调整量/p.u. |
| CNN方法 | SVM方法 | 特征值分析法 |
| G2 | 0.226 127 | 0.284 712 | 0.215 456 |
| G3 | 0.020 204 | 0.029 757 | 0.046 209 |
| G4 | 0.023 456 | 0.021 518 | 0.027 972 |
| G5 | -0.164 089 | -0.097 194 | -0.229 513 |
| G6 | 0.110 000 | 0.110 000 | 0.110 000 |
| G7 | -0.200 761 | -0.254 553 | -0.190 640 |
| G8 | -0.234 143 | -0.292 556 | -0.195 847 |
| 下调功率总量/p.u. | 0.598 993 | 0.644 303 | 0.616 000 |
), ArticleFig(id=1194653306011230673, tenantId=1146029695717560320, journalId=1190235702286704641, articleId=1194580236286263915, language=EN, label=null, caption=null, figureFileSmall=null, figureFileBig=null, tableContent=
| 模式 | 方法 | 频率/Hz | 阻尼比/% |
| 6 | CNN | 0.963 641 | 4.123 7 |
| SVM | 0.965 814 | 4.210 7 |
| 特征值分析法 | 0.962 339 | 4.083 6 |
| 7 | CNN | 0.708 528 | 3.008 3 |
| SVM | 0.709 339 | 3.034 3 |
| 特征值分析法 | 0.707 207 | 3.026 7 |
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频域仿真结果(控制后)
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| 模式 | 方法 | 频率/Hz | 阻尼比/% |
| 6 | CNN | 0.963 641 | 4.123 7 |
| SVM | 0.965 814 | 4.210 7 |
| 特征值分析法 | 0.962 339 | 4.083 6 |
| 7 | CNN | 0.708 528 | 3.008 3 |
| SVM | 0.709 339 | 3.034 3 |
| 特征值分析法 | 0.707 207 | 3.026 7 |
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