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Grid-connected control method of single-phase photovoltaic grid-connected system

A control method and photovoltaic technology, applied in photovoltaic power generation, single grid parallel feeding arrangement, AC network circuit, etc., can solve problems such as poor grid connection effect and complicated control process, and achieve easy control strategy implementation and simple control process. , the effect of grid connection is good

Inactive Publication Date: 2016-11-16
GUANGXI UNIVERSITY OF TECHNOLOGY +1
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Problems solved by technology

[0003] The purpose of the present invention is to provide a grid-connected control method for a single-phase photovoltaic grid-connected system, which can solve the problems of complicated control process and poor grid-connected effect of the existing grid-connected control technology

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Embodiment Construction

[0011] Below in conjunction with accompanying drawing and embodiment the present invention is described in further detail:

[0012] figure 1 In the grid-connected control method of the single-phase photovoltaic grid-connected system shown, the output terminal of the PI control module 1 is connected to the input terminal of the current hysteresis loop control module 2, and the output terminal of the current hysteresis loop control module 2 is connected to the input terminal of the PWM generator 3 The PWM generator 3 is connected to the filter module LCL through the inverter 4, the output terminal of the filter module LCL is connected to the input terminal of the PI control module 1, and the output terminal of the phase-locked loop PLL is connected to the PI control module 1 and the current hysteresis loop The wiring connection of the control module 2;

[0013] The implementation method is: the set reference voltage Vref and the grid voltage Vnet are input from the input termin...

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Abstract

The invention discloses a grid-connected control method of a single-phase photovoltaic grid-connected system, and relates to the technical field of power generation equipment manufacturing. A reference voltage and a network voltage are input from the input end of a PI control module, and a grid-connected current reference amplitude is output from the output end of the PI control module after PI calculation; a sampling voltage obtained from a photovoltaic cell is multiplied with the phase angle of a phase-locked loop in the phase-locked loop to obtain a grid-connected inverter reference current, the current reference amplitude, the grid-connected inverter reference current and the inverter sampling current are input to a current hysteresis control module respectively, the grid-connected inverter reference current and the inverter sampling current perform difference calculation in the current hysteresis control module, an error measurement value controls the output of an inverter through a PWM generator, the output of the inverter becomes stable sine-wave current output after filtering of a filtration module to be grid-connected, and the network voltage is obtained from the output end of the filtration module. The grid-connected control method can solve the problem that an existing grid-connected control technology is complicated in control process and poor in grid-connected effect.

Description

technical field [0001] The invention relates to the technical field of power generation equipment manufacturing, in particular to a grid-connected control method for a single-phase photovoltaic power generation system. Background technique [0002] With the rapid increase of people's demand for electric energy in modern society, we have to increase power generation. However, most of the traditional power supply comes from thermal power generation. Thermal power generation pollutes the environment too much, which forces us to develop new energy power generation. . Using solar power to generate electricity is currently the most ideal way of new energy power generation. Photovoltaic grid-connected power generation is the most important way of solar power generation. What kind of method to adopt to make grid-connected successful is the first issue we must consider. At present, most of the grid-connected control technologies for single-phase photovoltaic grid-connected systems r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02J3/01
CPCH02J3/01H02J3/383Y02E10/56Y02E40/40
Inventor 刘胜永胡坤波黄俊华
Owner GUANGXI UNIVERSITY OF TECHNOLOGY
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