Mixed maximum power point-tracing control method of photovoltaic water-raising system

A technology of maximum power point and photovoltaic water pumping, applied in photovoltaic power generation, control system, control/regulation system, etc., can solve the problems of low output frequency, affecting the tracking effect of maximum power point, etc., and achieve the effect of improving dynamic tracking characteristics
CN100426175CInactive Publication Date: 2008-10-15SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Patents(China)
Current Assignee / Owner
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
Publication Date
2008-10-15
Estimated Expiration
Not applicable Β· inactive patent

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Abstract

A tracking and control method for the hybridded maximum power point of the photovoltaic pumping system. It contains: a, the check and choice logo, it will turn to the step b if it is ture, or it will turn to the step d. b, the output frequency of the inverter will be adjusted the running of the multiple criteria. C, the choice logo will become untrue and the reference voltage Verf=V (n), and the real running time of the normal voltage method, tCV, will be reset, and turn to the step a, or turn to the step a. d, the output frequency of the inverter will be adjusted by the running of the normal voltage method. e, To add a control cycle into the running time of the normal voltage method, tvc, the choice logo will be true if the tvc >= TVC and turn to the step a, or it will turn directly to the step a. it adjust the output frequency by the alternative running of multiple criteria and normal voltage, it can adjust the output frequency in time and control the DC voltage effectively and assure the stable running of the system, the system owns rapid and dynamic tracking characteristics, and a good stable characteristics by taking advantage of this method .
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Description

technical field

[0001] The invention relates to the technical field of photovoltaic power generation, in particular to a maximum power point tracking method applied in an independent photovoltaic pumping system. Background technique

[0002] The independent photovoltaic water pumping system has broad application prospects for solving ecological problems such as drinking water for humans and animals in remote areas, agriculture and shelter forest irrigation, and can also be used for water spraying landscapes in urban parks, so it has received extensive attention. The independent photovoltaic pumping system consists of Figure 9 The three parts shown consist of a photovoltaic cell array, a dedicated frequency converter, and a water pump using a three-phase asynchronous motor. Based on the principle that electricity storage is not as good as water storage in the photovoltaic pumping system, no storage battery is configured to simplify the system and reduce costs.

[0003] Phot...

Claims

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