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Droop control is a common current sharing method for parallel converters in DC microgrid. However, due to the inconsistency of line parameters and the sampling error of sensors, the current distribution accuracy of traditional droop control is low. In order to solve this problem, this paper proposes a parallel current sharing strategy based on AC signal injection. Firstly, by superimposing an AC voltage small signal on the output voltage of the converter, the droop characteristic between the frequency of the AC voltage and the output current of the converter is constructed, and the reactive power generated by the signal and the feedback mechanism are used to realize the accurate current sharing of the converter. Secondly, the compensation virtual resistance is introduced to improve the stability of the system when the load changes greatly. Then, the design mode switching link stops the injection of AC signals in the steady state, so that the power quality can be improved. Finally, the effectiveness of the proposed control strategy is verified by simulation results.
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直流微电网中并联变换器常用下垂控制进行均流,但因线路参数不一致以及传感器采样误差,致使传统下垂控制电流分配精度较低。文章提出了一种基于交流信号注入的并联均流策略。首先,通过在变换器的输出电压上叠加一个交流电压小信号,构建交流电压的频率与变换器输出电流间的下垂特性,利用该信号产生的无功功率以及反馈机制实现变换器的精确均流;其次,引入补偿虚拟电阻,提高系统在负荷变化较大时的稳定性;然后,设计模式切换环节使得稳态时停止注入交流信号,让电能质量得以改善;最后,仿真结果表明该控制策略实现了大负载接入情况下的系统稳定,能够在无通信条件下自适应完成电流均分和改善电能质量的目标。
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, authorsList=薛阳, 杨江天, 李金星, 李清, 丁凯)}, authors=[Author(id=1159145979711959750, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1152342294650253567, orderNo=0, firstName=null, middleName=null, lastName=null, nameCn=null, orcid=null, stid=null, country=null, authorPic=null, dead=0, email=xueyang@shiep.edu.cn, emailSecond=null, emailThird=null, correspondingAuthor=0, authorType=1, ext={EN=AuthorExt(id=1159145979791651527, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1152342294650253567, authorId=1159145979711959750, language=EN, stringName=Yang Xue, firstName=Yang, middleName=null, lastName=Xue, prefix=null, suffix=null, authorComment=null, nameInitials=null, affiliation=null, department=null, xref=null, address=null, bio=null, bioImg=null, bioContent=null, aboutCorrespAuthor=null), CN=AuthorExt(id=1159145979854566088, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1152342294650253567, authorId=1159145979711959750, language=CN, stringName=薛阳, firstName=null, middleName=null, lastName=null, prefix=null, suffix=null, authorComment=null, nameInitials=null, affiliation=null, department=null, xref=null, address=null, bio={"content":"
薛阳(1976-),男,博士,副教授,研究方向为微电网协调控制、微网能量管理。E-mail: xueyang@shiep.edu.cn。
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薛阳(1976-),男,博士,副教授,研究方向为微电网协调控制、微网能量管理。E-mail: xueyang@shiep.edu.cn。
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1 School of Automation Engineering Shanghai University of Electric Power Shanghai 200090 China), AuthorCompanyExt(id=1159145979640656580, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1152342294650253567, companyId=1159145979628073666, language=CN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=
1 上海电力大学 自动化工程学院 上海 200090)])], figs=[ArticleFig(id=1159145981796528921, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1152342294650253567, language=EN, label=Fig. 1, caption=
Typical structure of DC microgrid system, figureFileSmall=WCXF7P1C4kT+iFP0hpfbug==, figureFileBig=txSuuEmhS/7joA73N4snGw==, tableContent=null), ArticleFig(id=1159145981872026395, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1152342294650253567, language=CN, label=图 1, caption=
直流微电网系统的典型结构, figureFileSmall=WCXF7P1C4kT+iFP0hpfbug==, figureFileBig=txSuuEmhS/7joA73N4snGw==, tableContent=null), ArticleFig(id=1159145981943329567, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1152342294650253567, language=EN, label=Fig. 2, caption=
Simplified DC microgrid circuit with two converters in parallel, figureFileSmall=ymoMt/dtUQQ7iU5WDebZNw==, figureFileBig=vpo38DqeruZyz3HGFjK7KQ==, tableContent=null), ArticleFig(id=1159145982010438436, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1152342294650253567, language=CN, label=图 2, caption=
含 2 台变换器并联的直流微电网简化电路, figureFileSmall=ymoMt/dtUQQ7iU5WDebZNw==, figureFileBig=vpo38DqeruZyz3HGFjK7KQ==, tableContent=null), ArticleFig(id=1159145982090130215, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1152342294650253567, language=EN, label=Fig. 3, caption=
Parallel current sharing strategy based on AC signal injection, figureFileSmall=7DcLEThwE/Y4bpC0cix/AA==, figureFileBig=nL7xTLBSk9cIJQi167QW4w==, tableContent=null), ArticleFig(id=1159145982169821993, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1152342294650253567, language=CN, label=图 3, caption=
基于交流信号注入的并联均流策略, figureFileSmall=7DcLEThwE/Y4bpC0cix/AA==, figureFileBig=nL7xTLBSk9cIJQi167QW4w==, tableContent=null), ArticleFig(id=1159145982236930857, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1152342294650253567, language=EN, label=Fig. 4, caption=
AC equivalent circuit of two parallel converters, figureFileSmall=L9FqdfZlMVYH04ccxsvDZQ==, figureFileBig=Y8mwvUpqPw1KgKFJiEFV2w==, tableContent=null), ArticleFig(id=1159145982312428333, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1152342294650253567, language=CN, label=图 4, caption=
2 台变换器并联的交流等效电路, figureFileSmall=L9FqdfZlMVYH04ccxsvDZQ==, figureFileBig=Y8mwvUpqPw1KgKFJiEFV2w==, tableContent=null), ArticleFig(id=1159145982396314415, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1152342294650253567, language=EN, label=Fig. 5, caption=
Current sharing feedback control process of 2 parallel equal capacity converters, figureFileSmall=ZiM97q4lpwSl4+xTg5teFg==, figureFileBig=3Va1uWeNcamr23JChUCZnw==, tableContent=null), ArticleFig(id=1159145982484394801, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1152342294650253567, language=CN, label=图 5, caption=
2 台等容量变换器并联均流反馈控制过程, figureFileSmall=ZiM97q4lpwSl4+xTg5teFg==, figureFileBig=3Va1uWeNcamr23JChUCZnw==, tableContent=null), ArticleFig(id=1159145982547309366, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1152342294650253567, language=EN, label=Fig. 6, caption=
Output results of traditional droop control, figureFileSmall=sXnQdFYp1o1VgV6LZBJeXg==, figureFileBig=lW1xshUQSi/2QI1ELUTkuQ==, tableContent=null), ArticleFig(id=1159145982618612537, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1152342294650253567, language=CN, label=图 6, caption=
传统下垂控制输出结果, figureFileSmall=sXnQdFYp1o1VgV6LZBJeXg==, figureFileBig=lW1xshUQSi/2QI1ELUTkuQ==, tableContent=null), ArticleFig(id=1159145982694110010, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1152342294650253567, language=EN, label=Fig. 7, caption=
Output results of signal injection method, figureFileSmall=D7cRw3o5WIbo/GO0t1D/VQ==, figureFileBig=T8j8IyP12kZZGKaoDFme4Q==, tableContent=null), ArticleFig(id=1159145982748635963, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1152342294650253567, language=CN, label=图 7, caption=
信号注入法输出结果, figureFileSmall=D7cRw3o5WIbo/GO0t1D/VQ==, figureFileBig=T8j8IyP12kZZGKaoDFme4Q==, tableContent=null), ArticleFig(id=1159145982807356222, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1152342294650253567, language=EN, label=Fig. 8, caption=
Output results of improved control, figureFileSmall=Xql2Q6/kw6N37P+cJXkNcA==, figureFileBig=5UQdsFFzM8biY4kxmjy4Sg==, tableContent=null), ArticleFig(id=1159145982870270784, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1152342294650253567, language=CN, label=图 8, caption=
改进控制的输出结果, figureFileSmall=Xql2Q6/kw6N37P+cJXkNcA==, figureFileBig=5UQdsFFzM8biY4kxmjy4Sg==, tableContent=null), ArticleFig(id=1159145982924796738, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1152342294650253567, language=EN, label=Table 1, caption=
System simulation parameters, figureFileSmall=null, figureFileBig=null, tableContent=
| 参数 | DG1 | DG2 | DG3 |
| 变换器电感 $L/\mathrm{{mH}}$ | 1 | 1 | 1 |
| 变换器电容 $C/\mu \mathrm{F}$ | 1000 | 1000 | 1000 |
| 输入电压/V | 450 | 450 | 450 |
| 母线给定电压 ${U}^{ * }/\mathrm{V}$ | 700 | 700 | 700 |
| 线路阻抗 ${R}_{\text{line }}/\Omega$ | 1.2 | 1 | 0.8 |
| 频率下垂系数 ${d}_{\mathrm{{fk}}}$ | 0.15 | 0.3 | 0.3 |
| 叠加交流电压 $A$ | 3.5 | 3.5 | 3.5 |
| 注入频率 ${f}^{\prime }/\mathrm{{Hz}}$ | 50 | 50 | 50 |
| Q-V 耦合系数/V $\cdot {\mathrm{{var}}}^{-1}$ | 8 | 8 | 8 |
| 电流调节器 | 1.2+20/s | 1.2+20/s | 1.2+20/s |
| 电压调节器 | $2 + 2/\mathrm{s}$ | 2+2/s | 2+2/s |
), ArticleFig(id=1159145982991905605, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1152342294650253567, language=CN, label=表 1, caption=
系统仿真参数, figureFileSmall=null, figureFileBig=null, tableContent=
| 参数 | DG1 | DG2 | DG3 |
| 变换器电感 $L/\mathrm{{mH}}$ | 1 | 1 | 1 |
| 变换器电容 $C/\mu \mathrm{F}$ | 1000 | 1000 | 1000 |
| 输入电压/V | 450 | 450 | 450 |
| 母线给定电压 ${U}^{ * }/\mathrm{V}$ | 700 | 700 | 700 |
| 线路阻抗 ${R}_{\text{line }}/\Omega$ | 1.2 | 1 | 0.8 |
| 频率下垂系数 ${d}_{\mathrm{{fk}}}$ | 0.15 | 0.3 | 0.3 |
| 叠加交流电压 $A$ | 3.5 | 3.5 | 3.5 |
| 注入频率 ${f}^{\prime }/\mathrm{{Hz}}$ | 50 | 50 | 50 |
| Q-V 耦合系数/V $\cdot {\mathrm{{var}}}^{-1}$ | 8 | 8 | 8 |
| 电流调节器 | 1.2+20/s | 1.2+20/s | 1.2+20/s |
| 电压调节器 | $2 + 2/\mathrm{s}$ | 2+2/s | 2+2/s |
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