Full
Outline
In an islanded microgrid, the inverter filter circuit parameter perturbation and the insufficient steady-state performance of a PI controller will cause steady-state errors in the output signal, and the unbalanced loads, nonlinear loads and load switching will cause the degradation of dynamic performance. A performance compensation control structure based on a residual generator is proposed, and the gradient descent method is used to optimize the compensation controller in real time to enhance the system’s steady-state and dynamic performances. First, the transfer function model of an inverter under double closed-loop control is established, and the effects of filter circuit parameter perturbation, insufficient steady-state performance of the proportional-integral (PI) controller and load disturbance on the inverter’s output voltage performance are analyzed. Second, the performance compensation controller Q(s) in a quasi-resonant form is designed based on the real-time residual values obtained from the residual generator. Third, an optimization objective function is constructed based on the PI controller current-voltage error and the control input signal, and the compensation controller is optimized in real time using the gradient descent method. Finally, experiments were conducted using a DSP control board with a PXI semi-physical simulation platform to verify the effectiveness of the proposed method.
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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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