The energy storage system is an important part of photovoltaic microgrid. However, the traditional battery energy storage system has many problems such as a low power density and a short service life. A supercapacitor hybrid energy storage system based on photovoltaic power generation is established, and its control strategy is proposed, under which the DC-DC converter connected to the energy storage element is controlled through the coordinated operation of model predictive control (MPC) and low-pass filter, and the DC-AC converter connected to the AC side is controlled through a virtual synchronous generator. MPC is a real-time control method, and it can determine the constraints in certain time domain in the future according to the system state at present and optimize the control objectives in the predicted time domain, which has good stability and robustness compared with other control methods. Under changes in the parameters including the intensity of solar radiation, the DC bus voltage can be kept stable, and the dynamic response capability of DC bus voltage can be improved. Finally, the system is simulated in MATLAB/Simulink, and the effectiveness of the proposed method is verified.
| 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 |