Full
Outline
With more and more microgrids (MGs) connected to power system, their operation control technology has become one of the key technologies to improve the utilization of renewable energy sources (RESs). However, when an MG switches between grid-connected and islanding operation modes, problems such as large voltage and frequency fluctuations will occur due to uncertainties in RESs output and the inconsistency of voltage, frequency and phase angle in the two operation modes. On this basis, a smooth switching control method of MG modes based on linear quadratic regulator (LQR) is proposed to reduce the drastic fluctuations of MG-related parameters during the mode switching. The proposed method uses the traditional LQR method and the state feedback theory to establish a smooth regulation model. Then, a smooth LQR based on a 2-DOF structure and its parameter selection principle are designed to minimize the transient changes in MG-related parameters during the mode switching. Finally, the simulation analysis and experimental results validated the effectiveness and superiority of the proposed method. Compared with other methods, the novel method can effectively reduce the overshoot percentage of MG-related parameters by about 22% and shorten the time of MG voltage and frequency oscillations by about 13%. In addition, it is easy to implement, and it has good compatibility with the common double-loop PI control.
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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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