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首页> 外文期刊>Electric power systems research >A proposal to power quality improvement based on SHAPF with P-SSI controller parameters optimized by multi-objective optimization and applied through gain scheduling technique
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A proposal to power quality improvement based on SHAPF with P-SSI controller parameters optimized by multi-objective optimization and applied through gain scheduling technique

机译：基于SHAPF的电能质量改善建议，其中P-SSI控制器参数经过多目标优化优化并通过增益调度技术应用

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摘要

The voltage and current harmonic components occurs in the electric grid mainly due to the utilization of non-linear devices. Once their harmful effects are known, the maintenance of a low THD (total harmonic distortion) level in the grid increases the system reliability. In this context, the shunt active power filters (SHAPF) offers good operational performance for harmonic compensation when compared to traditional passive filters. However, the tuning of the controllers parameters is an important issue, once a SHAPF has two control loops implemented in a cascade configuration. Such loops influence the behavior of two important variables for the SHAPF operation, i.e. the voltage error in the DC Link and the THD in the source current. Since both variables should be minimized and considering that they work in a trade-off condition, a multi-objective optimization algorithm is used in this work, in order to obtain a set of solutions that minimize both variables. In the sequence, only the solution with the lowest THD associated with an overshoot lower than 10% in the load commutation is chosen and used by a gain scheduling algorithm during 5 s simulation with loads different from those used in the optimization process. The results show a reduction of the harmonics from 18.09% in the load to 0.9% in the source. This is a reduction of 95% of the THD level propagated to the source. In addition, the 0.9% THD level propagated to the current source is much lower than the recommended by the IEEE 519 that is of 5%.
机译：电压和电流谐波分量出现在电网中，主要是由于利用了非线性设备。一旦知道它们的有害影响，就可以在电网中保持较低的THD（总谐波失真）水平，从而提高系统可靠性。在这种情况下，与传统的无源滤波器相比，并联有源功率滤波器（SHAPF）具有良好的谐波补偿性能。但是，一旦SHAPF具有以级联配置实现的两个控制回路，控制器参数的调整就成为一个重要问题。这种环路影响SHAPF操作的两个重要变量的行为，即DC Link中的电压误差和源电流中的THD。由于两个变量都应最小化并考虑它们在折衷条件下工作，因此在这项工作中使用了多目标优化算法，以便获得使两个变量最小化的一组解决方案。在序列中，仅选择和在负载换向中具有低于10％的过冲的THD最低的解决方案，并由增益调度算法在5 s仿真期间使用负载，该负载与优化过程中使用的负载不同。结果表明，谐波从负载中的18.09％降低到电源中的0.9％。这减少了传播到源的THD级别的95％。另外，传播到当前源的0.9％的THD级别远低于IEEE 519推荐的5％。

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