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Single-stage type photovoltaic water pump control system and method

A photovoltaic water pump and control system technology, applied in the control system, pump control, photovoltaic modules, etc., can solve the problems of high cost and complex structure of photovoltaic inverters, and achieve the effect of stable operation

Inactive Publication Date: 2014-10-01
HARBIN INST OF TECH
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AI Technical Summary

Problems solved by technology

[0019] The present invention provides a single-stage photovoltaic water pump control system in order to solve the problems of complex structure and high control cost of the photovoltaic frequency converter in the traditional photovoltaic water pump system

Method used

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  • Single-stage type photovoltaic water pump control system and method
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  • Single-stage type photovoltaic water pump control system and method

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Embodiment Construction

[0044] as attached figure 1 , Figure 5 and Figure 6 As shown, this embodiment describes the present invention in detail:

[0045] The hardware part of the single-stage water pump system is attached figure 1As shown, it mainly includes four parts: solar panel (photovoltaic system), inverter frequency converter, asynchronous motor, and water pump. The hardware part of the inverter inverter mainly includes five parts: auxiliary power supply circuit, DC sampling circuit, DC buffer circuit, drive signal generation circuit, and inverter bridge circuit. In the main circuit, the positive and negative poles drawn from the power supply of the solar cell are first connected to both ends of the buffer capacitor in the DC buffer circuit, and then directly connected to the DC bus of the frequency converter. into the three-phase stator winding of the asynchronous motor; the energy of the auxiliary power supply circuit part is taken from the DC buffer circuit part, which is converted ...

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Abstract

The invention relates to the field of photovoltaic driving control, in particular to a single-stage type photovoltaic water pump control system and method solving the problems that a photovoltaic frequency converter of a traditional photovoltaic water pump system is complex in structure and high in control cost. An inversion frequency converter of the single-stage type photovoltaic water pump control system is an energy level, the direct current change link in the traditional photovoltaic water pump frequency converter is structurally removed, and the maximum power tracking and energy buffering functions in the original direct current converting link are achieved through the control function. The condition that the frequency disturbing method is adopted to carry out photovoltaic output to a water pump motor to output energy in control is utilized, and therefore maximum power output and stable system operation can be met. The control method is used for controlling the system frequency f, and priority is given to the maximum photovoltaic side power tracking method for frequency control. The frequency f is approximately in direct proportion with the revolving speed of the motor, the cube of the revolving speed of the motor is in direct proportion with the output power P of a load water pump, the frequency is adjusted, transmission power control can be achieved, and therefore a photovoltaic part can be output with maximum power.

Description

technical field [0001] The invention relates to a power electronic control system, in particular to the field of photovoltaic drive control. Background technique [0002] Photovoltaic water pump system is a solar power system that operates independently of the grid. Because it has the same output as the intensity of sunlight, the system is safe and reliable and can be unattended, it is especially suitable for water-deficient areas and urban natural landscapes. It uses solar power to generate electricity Converted into potential energy of water resources for application. The operation of the photovoltaic water pump system mainly depends on the two functions of the system controller, one is the maximum power tracking function of the photovoltaic system, and the other is the driving function of the water pump motor. [0003] The traditional system is similar to the design of the inverter. The first stage of the power electronic conversion uses a DC chopper circuit to control t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P27/08H02M7/48H02S40/32F04B49/06
CPCY02E10/56
Inventor 丁宝张永明赵亮刘群
Owner HARBIN INST OF TECH
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