Control Performance Characterization and Monitoring Scheme for Power Converters in Weak Grids
Control Performance Characterization and Monitoring Scheme for Power Converters in Weak Grids
复制标题
弱电网中功率变换器的控制性能表征和监测方案
DOI：
10.1109/ojpel.2023.3319369
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发表时间：
2023
影响因子：
5.8
通讯作者：
Zhen Xin
中科院分区：
文献类型：
--
作者：
Jiachen Wang;Qing Liu;Xiangchen Zeng;Weijian Han;Zhen Xin
在弱电网中，电网阻抗的显著变化会对功率变流器的控制性能产生不利影响，容易导致抗谐波性能下降、谐振甚至系统不稳定。因此，本文提出了一种快速的控制性能监测器，以获取功率变流器的实际性能指标，即交叉频率和相位裕度。利用测量的实时信息，可以方便地实现电力系统的健康管理、控制参数设计和自适应控制等重要功能。通过对被测功率变流器的控制回路进行频率自调谐的小信号扰动来实现监控，具有良好的动态响应和抗噪声性能。由于100%的数字化实施，拟议的性能监控器不需要额外的硬件，也不需要进一步的成本。文中给出了基于包络建模方法的小信号模型推导的监测器的详细设计。为了验证所提出的监测器的有效性，进行了大量的实验。
In weak grids, control performance of power converters is negatively affected by the significantly varied grid impedance, which can easily lead to degradation of anti-harmonic performance, resonances or even system instability. A rapid control performance monitor is therefore proposed in this work to acquire power converters’ actual performance indexes, i.e., the crossover frequency and phase margin. With the measured real-time information, important functions like health management, control parameters design and adaptive control of power systems can be conveniently realized. The monitor is implemented by perturbating the control loop of the power converter under test with a frequency-autotuned small signal, showing satisfying dynamic response and anti-noise performance. Thanks to the 100% digital implementation, the proposed performance monitor requires no extra hardware and no further cost. The detailed design of the monitor, based on small signal models derivation employing an envelope modeling method, is presented in this article. Extensive experiments were carried out to verify the efficacy of the proposed monitor.