Full
Outline
The series impedance measurement device (SIMD) measures the impedance of a new energy grid-connected inverter by injecting voltage disturbances. However, the rated fundamental current of the inverter under test will flow through the SIMD and thus limit the switching frequency. To address this issue, an SIMD based on resonance shunt is proposed. The proposed topology and control strategy ensure the impedance measurement accuracy in the range of 5 Hz–1 kHz, and achieve a goal that the fundamental current hardly flows through the SIMD and thus the SIMD only bears a small disturbance current. At the same time, an impedance measurement method based on single-phase voltage disturbance injection is adopted to realize the impedance measurement of a three-phase inverter, which improves the device’s energy density and measurement efficiency. Finally, the validity of the proposed topology and control strategy was verified by hardware-in-the-loop experiments.
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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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