Full
Outline
Aimed at the problem of system voltage imbalance caused by single-phase grounding high-resistance faults in inverter lines in an islanding operation mode of microgrids, a zero-axis high-resistance fault detection and fault-tolerant control method based on a residual generator is proposed to reduce the degree of system voltage imbalance. First, a state space model for the dq0 axis of a four-bridge-arm inverter is established, and the impact of high-resistance faults on output voltage is analyzed. Second, based on the theory of left and right coprime decomposition and Euler parameterization, a residual generator is designed to obtain residuals, and a Butterworth bandpass filter is used to generate zero-axis residual components for fault detection. Third, from the perspective of zero-axis disturbance cancellation, a zero-axis fault-tolerant controller is designed using the model matching theory, which is further solved using a linear matrix inequality method. Finally, high-resistance fault detection and fault-tolerant control experiments were conducted using a PXI semi-physical simulation platform to verify the feasibility 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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