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Outline
The grid-forming photovoltaic systems with traditional three-phase pulse width modulation (PWM) inverters has problems such as large harmonics and low efficiency, and the main modeling research on grid-forming virtual synchronous generator (VSG) control at present does not take into account the influences of inverter topology and multilevel converter on the system stability. Since the T-type three-level has advantages including small harmonics and low switching loss, a universal T-type three-level state space average model applied to grid-forming VSG is proposed. An equivalent controlled source circuit is formed with a substitution of the controlled source by averaging the switching devices in the circuit, and a complete state space equation is established for stability analysis. Finally, simulations and experiments were carried out to verify the adaptability of the established equivalent controlled source model and the actual circuit. Results show that the output characteristics of the VSG mathematical model based on the controlled source are almost consistent with those of the actual model, and it has good stability.
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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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