Due to the intermittency of distributed generations and frequent fluctuations in non-linear loads in microgrids, significant changes in harmonic energy will occur. Although multiple parallel active power filters (APFs) can be used to effectively mitigate harmonics in microgrids, the parallel operation will result in circulating currents due to uneven compensation currents among the APFs, leading to increased system losses. To address this issue, a current-sharing control method based on the integrated transmission technology for electric energy information is proposed. With the incorporation of information modulation at the power modulation stage of an inverter, the transmission of key information is realized while the converting the electric energy, thereby enabling current-sharing control of the parallel system. Compared with the traditional centralized and master-slave control methods, the proposed method eliminates the need for additional communication equipment and lines, enhancing the system’s reliability, flexibility and scalability. The results of a simulation experiment based on RT-LAB validate the feasibility and effectiveness of the proposed current-sharing control method.
| 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 |