Full Discrete Modeling, Controller Design, and Sensitivity Analysis for High-Performance Grid-Forming Converters in Islanded Microgrids
Full Discrete Modeling, Controller Design, and Sensitivity Analysis for High-Performance Grid-Forming Converters in Islanded Microgrids
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DOI：
10.1109/tia.2018.2847635
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发表时间：
2018-11-01
影响因子：
4.4
通讯作者：
Pastorelli, Michele
中科院分区：
文献类型：
--
作者：
de Souza Ribeiro, Luiz Antonio;Freijedo, Francisco D.;Pastorelli, Michele
最近的工作表明，电容电压的状态反馈解耦允许在孤岛微电网中用于成网变换器的电流控制器的带宽急剧扩大。此外，Smith预估器和超前补偿也被证明是补偿控制器延迟的非常有效的实现。这些特性是满足孤岛应用中电压调节要求的关键。这项工作深化了上述技术的离散时域建模和实现问题。一个完整的离散时间和灵敏度分析揭示的现象没有适当的modeled在previousworks，这限制了性能：高频振荡的存在，由于离散极点的负真实的部分。随后，适当的设计对策（即，限制带宽）。离散实现的电压控制器也得到解决，并提供设计准则。按照不间断电源系统的高要求标准进行的实验测试验证了理论分析。
Recent works have shown that the state-feedback decoupling of capacitor voltage allows for drastic bandwidth enlarging of current controllers for grid-forming converters in islanded microgrids. Furthermore, Smith predictor and lead compensation have been also proved as very effective implementations for compensating the controller delays. These features are key to fulfill demanding requirements in terms of voltage regulation in islanded applications. This work deepens in the discrete-time domain modeling and implementation issues of the above-mentioned techniques. A full discrete-time and sensitivity analyses reveal phenomena not properlymodeled in previousworks, which limits the performance: the presence of high-frequency oscillations due to discrete poles with negative real part. Subsequently, proper design countermeasures (i.e., limit bandwidth) are proposed. Discrete implementation of the voltage controller is also addressed, and design guidelines are provided. Experimental tests in accordance with the high demanding standards for uninterruptible power supply systems verify the theoretical analysis.