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

Inactive Publication Date: 2008-10-15
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the enhanced irradiance, ΔI>0, ΔV>0, the formula (10) reverses the frequency reduction control, resulting in a short-term low output frequency, which affects the maximum power point tracking effect

Method used

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

Examples

Experimental program
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Effect test

Embodiment 1

[0057] Such as figure 1 As shown, the photovoltaic pumping system includes a photovoltaic cell array 1, a water pump 5 and an inverter 4, the output end of the inverter 4 is connected to the power supply end of the water pump 5, and the input end of the inverter 4 is connected to the output end of the photovoltaic cell array 1. The output circuit of the photovoltaic cell array 1 is provided with an anti-surge circuit 2 and a smoothing circuit 3, which also includes:

[0058] MCU 11, there are multiple criterion method tracking control modules and normal pressure method tracking control modules inside the MCU, which are used to alternately track and control the maximum power point of the photovoltaic pumping system;

[0059] Voltage detection module 7, its input end is connected to the output end of photovoltaic cell array 1, and its output end is connected to the input end of MCU11, is used for detecting the output voltage V (n) of photovoltaic cell array 1;

[0060] The fir...

Embodiment 2

[0082] The system composition of the photovoltaic water pumping system in Embodiment 2 is the same as that of Embodiment 1, the difference is that the photovoltaic water pumping system in Embodiment 2 uses a hybrid maximum power point tracking control method to track and control the maximum power point, refer to Figure 4 , the hybrid maximum power point tracking control method alternately operates the multiple criterion method and the normal pressure method to adjust the output frequency of the frequency converter. Law execution cycle T CV (about 10 seconds) to provide the best reference voltage value, including the following steps:

[0083] a. Each control cycle T of MCU11 in the system C Check the logical value of the selection flag k, if true (i.e. k=1), go to step b, otherwise go to step d;

[0084] B, run multiple criterion method, adjust the output frequency f(n) of frequency converter 4;

[0085] c. If the current frequency modulation is different from the previous ...

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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 .

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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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05F1/66G05F1/67H02P27/06
CPCY02E10/58Y02E10/56
Inventor 徐政李友春陈锐坚
Owner SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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