With the large scale access of distributed photovoltaic, the problem of voltage over limit at the end of low voltage distribution network often occurs, and the traditional centralized voltage over limit management method has too many dependent variables to meet the real time requirements of flexible regulation. In view of the above reasons, this paper proposes a layered and hierarchical flexible control method for grid connection voltage for distributed photovoltaic. Firstly, the voltage overlimit index of different junction points is divided into regions, and the flexible regulation algorithm of reactive power and active power of distributed photovoltaic power generation is proposed. Through the three level governance architecture of voltage overlimit management of junction points, voltage overlimit management of distribution station area and regional voltage overlimit management, the safe and compliant operation of voltage at the end of low voltage distribution network is ensured. Finally, the experimental environment is set up to verify the effectiveness of the layered and hierarchical flexible regulation algorithm on the control of voltage overlimit at the end of the low voltage distribution network.
In view of the problem of excessive extraction of groundwater from farmland irrigation in Hebei Province, it is urgent to carry out the research on the measurement method of irrigation water. Due to the problems of easy damage of irrigation water measurement facilities installed in the field, inaccurate data collection and high investment cost of water measurement facilities, it is the most economical and effective method to carry out the research on the "water conversion by electricity" fee control terminal, and calculate the irrigation water consumption through the method of "water conversion by electricity". In this paper, the method of measuring water quantity by electricity is used to study the algorithm model, algorithm accuracy and the architecture of the fee control terminal of "water conversion by electricity". The main research conclusions of this paper include: the "water conversion by electricity" algorithm model meets the needs of irrigation water calculation, and the calculation accuracy is less than 2%. The designed "water conversion by electricity" fee control terminal has the functions of parameter distribution, power data acquisition, power charge accounting, water charge accounting and so on, which effectively reduces the investment cost of water metering facilities. In terms of future work, the dynamic optimization of "water conversion by electricity" algorithm needs to be improved in terms of predicting the change trend of "water conversion by electricity" coefficient in advance in combination with meteorological data.
In response to the notice on accelerating the comprehensive reform of agricultural water price put forward by the state, we will strengthen the comprehensive reform of agricultural motor well irrigation water price, and guide agricultural production to save water and irrigate scientifically. This paper takes the calculation of agricultural well irrigation water price, and puts forward the calculation method of well irrigation water price based on BP neural network. The calculation of irrigation water price of agricultural motor well applies to the intelligent power consumption device of agricultural irrigation. Guide farmers to save water and reasonable irrigation, and provide technical support for Rural Revitalization. Use the stage water price charging mode to reasonably control the water consumption according to the land area of each household.
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