Control method of multi-pump parallel photovoltaic pumping system, inverter and photovoltaic pumping system

A technology of photovoltaic water pumping and control methods, which is applied in pump control, photovoltaic power generation, control/regulation systems, etc., can solve problems such as operating frequency oscillation, system collapse, and system efficiency reduction, and meet the requirements of reducing the real-time communication rate and improving real-time Sex and precision, simple and cheap to achieve the effect

Active Publication Date: 2021-11-09
SHENZHEN SOLARTECH RENEWABLE ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of this, it is necessary to provide a control method for a multi-pump parallel photovoltaic pumping system to solve the problem of the master-slave communication system when the master of the existing photovoltaic pumping system controls the start or stop of the slave and adj

Method used

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  • Control method of multi-pump parallel photovoltaic pumping system, inverter and photovoltaic pumping system
  • Control method of multi-pump parallel photovoltaic pumping system, inverter and photovoltaic pumping system
  • Control method of multi-pump parallel photovoltaic pumping system, inverter and photovoltaic pumping system

Examples

Experimental program
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Embodiment 1

[0050] Please refer to figure 2 , this embodiment provides a control method for a multi-pump parallel photovoltaic pumping system, including the following steps:

[0051] Step S101 , when the host inverter is powered on and running, the running frequency of the host water pump is adjusted through the maximum power tracking mode.

[0052] After the host inverter is powered on, it first enters the maximum power tracking mode. In the maximum power tracking mode, the input power of the photovoltaic array to the host inverter is detected, and the operating frequency of the host water pump is adjusted according to the change of the input power. Achieve maximum power tracking. Among them, the maximum power tracking technology is mature, and this embodiment does not limit it.

[0053] Step S102, when the operating frequency of the master water pump increases to greater than or equal to the first preset frequency, send an operation command carrying the target value of the slave oper...

Embodiment 2

[0081] Please refer to image 3 , this embodiment provides a control method for a multi-pump parallel photovoltaic water pumping system. The control method describes how the photovoltaic water pumping system starts, and changes with the continuous increase and decrease of light, from the operation of one host to the gradual start-up. Multiple slaves, and then gradually turn off multiple slaves and the whole process of shutting down the master, and in this embodiment, the master controls the start-up, shutdown and operation frequency adjustment of the slaves, which includes the following steps:

[0082] In step S201, the inverter of the main engine is powered on and runs, and the operating frequency of the water pump of the main engine is adjusted through the maximum power tracking mode.

[0083] Step S202, judging whether the running frequency of the water pump of the main engine is greater than or equal to the rated frequency, if the judging result is yes, go to step S203, if...

Embodiment 3

[0106] In the multi-pump parallel photovoltaic pumping system, when the specifications of the pumps in the parallel photovoltaic water pumps are the same, a better control effect can be achieved. The above embodiment 1 and embodiment 2 are described by taking the same water pump specifications as an example. However, the control method of the multi-pump parallel photovoltaic pumping system of the present invention does not limit the specifications of the water pumps, and when the specifications of the various water pumps are inconsistent, a good control effect can still be achieved. Examples are as follows:

[0107] According to the theoretical relationship between the power of the centrifugal pump and the cubic linear correlation of the frequency: the power of the pump P=k*F 3 , k varies according to the specifications of the water pump, and F is the operating frequency of the water pump. Assuming that the specifications of the pumps in the photovoltaic pumping system are i...

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Abstract

The invention discloses a control method of a multi-pump parallel photovoltaic pumping system, an inverter and the photovoltaic pumping system. The invention discloses the control method of the multi-pump parallel photovoltaic pumping system. The control method of the multi-pump parallel photovoltaic pumping system comprises the steps of adjusting the running frequency of a host water pump in a maximum power tracking mode when a host inverter is powered on and runs; when the operation frequency of the host water pump is greater than or equal to a first preset frequency, sending an operation instruction carrying a slave operation frequency target value to one slave inverter, and switching to a normal pressure method control mode; when the operation frequency of the host water pump is smaller than or equal to a second preset frequency, sending a stop instruction to one slave inverter, sending an instruction carrying a slave operation frequency target value to the remaining slave inverters, and switching to a normal pressure method control mode; and when the slave water pump reaches the slave operation frequency target value, switching the host inverter to the maximum power tracking mode, and synchronously adjusting the operation frequency of the slave water pump. Compared with the prior art, the control method of the multi-pump parallel photovoltaic pumping system has the advantages that the requirement on the real-time communication rate of a master-slave communication system is greatly reduced, and the requirement can be met by adopting a simple, low-cost and easy-to-implement communication mode.

Description

technical field [0001] The invention relates to the technical field of photovoltaic water pumping, in particular to a control method for a multi-pump parallel photovoltaic water pumping system, an inverter and a photovoltaic water pumping system. Background technique [0002] In recent years, the photovoltaic pumping system has been more and more extensively researched and applied. Usually, a photovoltaic pumping system includes a photovoltaic array, a dedicated inverter and a single water pump. The dedicated inverter will control the speed of a single water pump according to the change of the incident solar irradiance of the photovoltaic array to achieve maximum power point tracking ( Maximum Power Point Tracking: MPPT). The system design takes into account performance indicators such as the average daily effective operating time under different seasons and weather conditions, the power generation efficiency of the photovoltaic array, and the water pumping efficiency of th...

Claims

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Application Information

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IPC IPC(8): F04B17/00F04B49/06G05F1/67
CPCF04B17/006F04B49/06G05F1/67Y02E10/56
Inventor 陈锐坚王晓冉徐政
Owner SHENZHEN SOLARTECH RENEWABLE ENERGY
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