Full
Outline
With a large number of renewable energy devices being integrated into DC distribution network, the factors such as the random fluctuation of photovoltaic power generation and unpredictability of loads will have an impact on the system stability. During its operation, the system has characteristics of being dominated by power electronic equipment and time-varying. To ensure the efficient and stable operation of the DC distribution network, it is crucial for obtaining the impedance characteristics of power electronic equipment in the distribution network accurately in real time. A wide-band impedance measurement method based on discrete interval binary sequence (DIBS) with optimized spectrum is proposed, and the phase optimization formula and Nelder-Mead algorithm are used for optimizing the phase of each frequency component of the DIBS generating signal. In addition, the methods of generating signal and amplitude selection are improved, so that the signal spectrum is focused on the target frequency band, and the measurement efficiency and accuracy are improved. To verify the effectiveness of the proposed method, the time-domain waveforms and spectra of the multi-sinusoidal signal and optimized DIBS signal are compared, and simulations are carried out in Matlab/Simulink to verify the method. Results show that the injected voltage amplitude of DIBS is smaller and can accurately measure the impedance characteristics of power electronic equipment with the same signal spectral energy. Finally, passive load impedance measurement experiments were carried out on a hardware platform to verify the effectiveness of the proposed method.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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