A multi-stage multi-pump control method applied to photovoltaic lifting irrigation station

Abstract

The invention provides a multistage multi-pump control method applied to a photovoltaic irrigation station. The multistage multi-pump control method applied to the photovoltaic irrigation station comprises the following steps: voltage values of photovoltaic cells are acquired; when the voltage values of the photovoltaic cells reach the start voltage, effectiveness of start signals is judged; afterthe start signals are judged to be effective, a self-adaption searching algorithm is adopted to calculate searching voltage with maximum power; searching control of MPPT maximum power is performed through the searching voltage, and an output frequency is calculated; tracking control and frequency outputting are performed through the output frequency; when solar energy exists, a first pump of first-stage pumps is controlled to start firstly; when the water pressure of water pipes of second-stage pumps is built, a first pump of the second-stage pumps is started; when energy is enough, a secondpump of the first-stage pumps is started; when the water pressure of the water pipes of the second-stage pumps is built again, the second pump of the second-stage pumps is started, and all water pumpsare started in sequence; and when the energy is insufficient, the second-stage pumps are stopped, and then, the first-stage pumps are stopped until all the pumps are stopped. The multistage multi-pump control method applied to the photovoltaic irrigation station is stable and reliable in system and high in utilization rate of the solar energy.

Description

Technical field [0001] The invention relates to the technical field of photovoltaic extraction and irrigation stations, in particular to a multi-stage and multi-pump control method applied to photovoltaic extraction and irrigation stations. Background technique [0002] Photovoltaic irrigation pumping station, also known as solar pumping irrigation station, is mainly used in farmland pumping irrigation, barren mountain desert management, water treatment, seawater desalination, fountain waterscape and other applications. As an important agricultural infrastructure, it provides water for agricultural production and life. Existing photovoltaic pumping and irrigation stations adopt control methods, including single-pump pumping and irrigation stations, multi-stage and multi-pump pumping and irrigation stations, etc. Due to the complex and changeable field application conditions, high requirements are placed on photovoltaic inverters, not only quality It is required to be stable and r...

AI Technical Summary

Problems solved by technology

[0004] (1) The adjustment of MPPT parameters is complicated: it is too dependent on the response speed of the MPPT control algorithm, and it is necessary to accurately adjust the gain parameters of each MPPT before the system can run

[0005] (2) The stability of the system is poor and the efficiency is low: the on-site light intensity changes greatly and the temperature difference changes greatly. Since there is no associated control between the inverters, the system fluctuates very greatly and often shuts down; the system often fluctuates, causing the pump to fail to stabilize High-efficiency area power work causes a lot of solar energy to be wasted, and the utilization rate of solar energy is low

[0006] (3) Energy distribution is uneven, there are problems such as idling of the water pump or excessive pressure of the water pipe, and the service life of the equipment is shortened

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