Full
Outline
A double integral sliding-mode (DISM) controller is introduced into the control strategy for a four-switch Watkins-Johnson (WJ) converter, which can improve the stability of the converter under bipolar voltage output and wide resistive-inductive load conditions. However, the direct application of its controller has a problem that the state variables cannot be measured unless two current sensors and one voltage sensor are used. Aimed at this problem, a nonlinear resistance is used to approximately replace the output load impedance of the converter, a large-signal reduced-order model suitable for the control of a sliding-mode variable structure is established, and an improved reduced-state DISM controller is designed accordingly. The improved controller utilizes the matching of sliding-mode coefficients to eliminate the influence of equivalent nonlinear resistance, thus avoiding the problem that the state variables cannot be directly measured unless a large number of voltage and current sensors are used. Simulation and experimental results show that the reduced-state DISM controller only needs to use one voltage sensor to make the converter work stably under the condition of bipolar voltage output and wide resistive-inductive loads, and the dynamic response performance of its output is less affected by changes in the operating point, indicating a strong control performance.
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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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