The continuous enlargement of doubly-fed wind farms has led to an exponential increase in the number of doubly-fed wind turbines within each wind farm, with projections suggesting that the count may even surpass thousands. If all components of an individual doubly-fed wind turbine are simulated, the wind farm model will reach thousands of orders. Simulating such a large model will produce a lot of calculations, which makes the results difficult to converge. Thus, it is crucial to perform an equivalent simulation of the wind farm and establish a corresponding model. Firstly, this paper summarizes the static equivalence and time-varying equivalence methods for modeling the wind farm at the station level. Then, the single-machine modeling method of typical DFIG is analysed, and the development direction of single-machine generalized modeling is proposed. Finally, the accuracy evaluation method and error correction method of the equivalent model summarized above are summarized, and the improvement and development direction of the accuracy evaluation method are proposed.
Strawberries have a high nutritional value and are a major source of fiber, iron, potassium, and flavonoids and other trace elements needed by humans. The growing environment of strawberry requires high air temperature and humidity: if the temperature is too high, it can affect pollination and increase the number of deformed fruits. If the air temperature is low, it can also cause freezing flowers to occur. The same goes for humidity, but once the relative humidity continues to be too high, when the plant is in bud, the germination rate and opening rate of anthers is low, and it is easy to cause gray mold when it enters the growing season. This thesis designs an electrical system for the intelligent monitoring and control of temperature and humidity in a strawberry greenhouse, based on the ‘STC89C51’ microcontroller, to achieve the monitoring of temperature and humidity information in the strawberry greenhouse, as well as automatic control of heating, cooling, humidification, dehumidification and other functions in the greenhouse based on the monitoring information, and through the upper computer software to store and analyze the measured data, and then according to the simulation, software and hardware debugging results by The visualization and analysis of the simulation and hardware and software results will lead to reasonable recommendations for environmental control in the strawberry greenhouse.
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