A movable cabinet-type photovoltaic water pump realizing distributed mppt

Abstract

The invention discloses a movable cabinet-type photovoltaic water pump realizing distributed MPPT in the field of photovoltaic applications, including a photovoltaic module and an electrical module; the photovoltaic module includes a photovoltaic panel surrounding the outer periphery of the cabinet and a photovoltaic panel arranged on the top of the cabinet ; The electrical components include a DC / DC control circuit that is connected to each photovoltaic panel and can achieve maximum power tracking. The output terminals of each DC / DC control circuit are connected in series to form a DC bus to connect to the pump control unit. The output end of the control circuit is also connected to a bidirectional isolated half-bridge DC / DC converter, the primary side of the bidirectional isolated half-bridge DC / DC converter is connected to the output end of the DC / DC control circuit, and the bidirectional isolated half-bridge DC / DC The secondary side of the converter is connected with a voltage equalizing capacitor, and the voltage equalizing capacitors corresponding to the bidirectional isolated half-bridge DC / DC converter are all connected in parallel, and the water pump control unit is used to control the operation of the water pump. The present invention solves the problem of mismatching and overcomes the It solves the problem that the overall efficiency of the system decreases due to environmental changes, and can be used in water pump control.

Description

technical field [0001] The invention relates to a water pump, in particular to a photovoltaic water pump. Background technique [0002] Photovoltaic water pump system is a typical independent photovoltaic power generation system. The photovoltaic water pump system is composed of a photovoltaic array, a converter and a motor pump. The photovoltaic array converts solar energy into direct current, and the converter drives the motor pump to pump water, which can be used for drinking water and irrigation for humans and animals. This kind of photovoltaic water pump system is simple and efficient. The early photovoltaic water pump system is driven by a simple DC motor. The DC water pump system does not have the maximum power tracking function. The output power of the water pump does not change with the maximum output power of the photovoltaic array. The efficiency of the system is not high. With the development of power electronics technology, switching devices are becoming more ...

AI Technical Summary

Problems solved by technology

The problem of light mismatch will bring non-negligible energy loss to the entire photovoltaic system, and will make the anti-parallel bypass diodes of some photovoltaic panels conduct, so that the overall output static characteristic curve presents "multiple maximum power points". "phenomenon, which also poses a challenge to the traditional maximum power tracking algorithm, and will also cause the output power of the entire photovoltaic grid-connected system to fluctuate

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