Cluster Voltage Regulation Strategy to Eliminate Negative-Sequence Currents Under Unbalanced Grid for Star-Connected Cascaded H-Bridge STATCOM
Cluster Voltage Regulation Strategy to Eliminate Negative-Sequence Currents Under Unbalanced Grid for Star-Connected Cascaded H-Bridge STATCOM
复制标题
星形级联H桥STATCOM消除电网不平衡负序电流的集群电压调节策略
DOI：
10.1109/tpel.2018.2844544
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发表时间：
2019-03
影响因子：
6.7
通讯作者：
Haibing Hu
中科院分区：
文献类型：
--
作者：
Daorong Lu;Sen Wang;Jianhui Yao;Tianyu Yang;Haibing Hu
在电网不平衡的情况下，星型串联H桥静止同步补偿器(CHB STATCOM)的三个群组电压通常被控制为平衡且不变，但为了处理不平衡的电网电压，调制电压变得不平衡，这将导致阶梯电压阶跃和群组电压上不平衡的双线频率纹波。因此，电流的谐波性能恶化。另外，在有功功率再分配时，往往会注入负序电流，这会降低电能质量。为了改善不平衡电网下的电流性能，将三个簇电压调节到不同的值，三相调制电压保持平衡。基于这一概念，通过分解变流器电压中的正序和负序分量，可以得到满足三相电流平衡的三个簇电压。为了保证集群电压的稳定，进一步提取零序电压进行有功功率分布分析。有趣的是，由负序电压和零序电压引起的每一相的总有功功率都等于零，这表明CHB STATCOM具有自然的零有功特性。为了将三个不等的簇电压保持在一定的边界内，建立了不平衡电网电压与簇电压之间的关系，并在此基础上提出了限制簇电压的算法。仿真和实验结果验证了理论分析和所提出的控制方案的正确性。
Under unbalanced grid, three cluster voltages are typically controlled balanced and unchanged for the star-connected cascaded H-bridge static synchronous compensator (CHB STATCOM), however, to deal with the unbalanced grid voltages, the modulation voltages become unbalanced, which would result in fewer steps of the staircase voltages and unbalanced double-line-frequency ripples across the cluster voltages. Thus, the harmonic performance of the currents is deteriorated. In addition, the negative sequence currents are always injected for active power redistribution, which degrades the power quality. To improve the current performance under the unbalanced grid, three cluster voltages are regulated to different values and three-phase modulation voltages can maintain balance. Based on this concept, three cluster voltages can be derived by decomposing the positive- and negative-sequence components from the converter voltages to meet the balance of three-phase currents. To ensure the cluster voltages stable, the zero-sequence voltage is further extracted to analyze the active power distribution. It is interesting to find that the total active power in each phase induced by both the negative and zero-sequence voltages is equal to zero, which reveals the CHB STATCOM has the natural zero-active-power feature. To keep three unequal cluster voltages within a certain boundary, the relationship between the unbalanced grid voltages and the cluster voltages is established, based on which the algorithm of limiting the cluster voltages is proposed. The theoretical analysis and the proposed control scheme are verified by the simulation and experimental results.
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影响因子：
6.7
作者：
S. Kouro;P. Lezana;Mauricio Angulo;José Rodríguez
通讯作者：
S. Kouro;P. Lezana;Mauricio Angulo;José Rodríguez
影响因子：
4.9
作者：
Nan Jin;C. Gan;Leilei Guo
通讯作者：
Nan Jin;C. Gan;Leilei Guo
影响因子：
7.7
作者：
Song, HS;Nam, K
通讯作者：
Nam, K
DOI：
10.1109/apec.2000.826136
发表时间：
2000-02
期刊：
APEC 2000. Fifteenth Annual IEEE Applied Power Electronics Conference and Exposition (Cat. No.00CH37058)
影响因子：
--
作者：
A. Stankovic;T. Lipo
通讯作者：
A. Stankovic;T. Lipo
影响因子：
7.7
作者：
R. Aguilera;P. Acuña;Yifan Yu;G. Konstantinou;C. Townsend;Bin Wu;V. Agelidis
通讯作者：
R. Aguilera;P. Acuña;Yifan Yu;G. Konstantinou;C. Townsend;Bin Wu;V. Agelidis