Full
Outline
Since the inverter-interfaced distributed generations (IIDGs) in microgrids exhibit special output characteristics, traditional protection schemes are no longer suitable for microgrids. Simultaneously, the idea of “Signal-injected active protection” introduces a novel perspective on microgrid protection. However, the shunt problem of non-injection source results in a poor protection performance. Under this background, in light of the idea of control-protection coordination, an active protection method for microgrids based on harmonic component injection is proposed. First, the frequency response characteristics of IIDG are analyzed. Then, the controllers of injection source and non-injection source are designed, and the corresponding start-up criteria are established. When a fault occurs, the injection source injects the characteristic signal of harmonic component with constant amplitude into the microgrid, while the non-injection source limits the shunt of the characteristic signal, so that the characteristic frequency equivalent network of the microgrid exhibits a single-source structure. Simulation results show that the proposed strategy can reliably start the harmonic component injection and solve the shunt problem of the characteristic signal, providing a solution for signal-injected microgrid protection.
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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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