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Photovoltaic grid-connected current and DC voltage secondary ripple suppression control system and control method

A secondary ripple and DC voltage technology, which is applied in the field of photovoltaic grid-connected current and DC voltage secondary ripple suppression control system, can solve the problem of affecting the photovoltaic array MPPT output reference voltage accuracy and reducing the grid-connected current. Quality, large DC filter capacitors and other issues, to achieve the effect of eliminating secondary power disturbances, improving grid-connected current quality, and reducing DC filter capacitors

Active Publication Date: 2016-05-25
NANYANG POWER SUPPLY COMPANY OF STATE GRID HENAN ELECTRIC POWER
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Problems solved by technology

This disturbance will cause a large number of secondary ripple components in the DC side voltage. On the one hand, the secondary ripple component in the DC side voltage will cause a large amount of tertiary ripple current in the grid-connected current, thereby reducing the quality of the grid-connected current; On the other hand, it will affect the accuracy of the photovoltaic array MPPT output reference voltage and the service life of the photovoltaic array
Aiming at the shortcomings of single-phase single-stage photovoltaic grid-connected systems, the currently widely used solution is to suppress secondary power disturbances by designing appropriate power decoupling capacitors. This method requires a very large DC filter capacitor, which makes the system volume and cost greatly increase

Method used

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[0014] Such as figure 1 , 2 , 3, the photovoltaic grid-connected current and DC voltage secondary ripple suppression control system used in the present invention is composed of photovoltaic array 1, MPPI controller 2, PI controller 7, grid-connected current controller 3, secondary ripple The controller 4 is composed of a single-phase photovoltaic grid-connected inverter 5, and the grid-connected current controller 3 includes a low-pass filter Q(z) connected in parallel for integral regulation and a notch filter C for compensation regulation (z) and a PI+ repeating controller 3-1; the secondary ripple controller 4 mainly includes a proportional resonance controller 4-1; the single-phase photovoltaic grid-connected inverter 5 is in the conventional inverter On the basis, a secondary power decoupling circuit 5-1 is added, which is specifically composed of three parts: an inverter unit 5-4, a secondary power decoupling circuit 5-1 and an output filter 5-2. Among them, the invert...

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Abstract

The invention discloses a photovoltaic grid-connected current and DC voltage secondary ripple suppression control system, which includes a photovoltaic array, a PI controller, a grid-connected current controller, a secondary ripple controller and a single-phase photovoltaic grid-connected inverter The grid-connected current controller includes a low-pass filter for integral regulation, a notch filter for compensation regulation and a PI+ repetition controller connected in parallel; the secondary ripple controller includes a proportional resonance control device. Combined with the control method of the present invention, the secondary power disturbance in the photovoltaic grid-connected current can be effectively eliminated, the effective suppression of the secondary ripple component in the DC side voltage and the substantial improvement of the quality of the grid-connected current can be realized, and the required DC The filter capacitor is greatly reduced, which reduces the volume of the system, reduces the cost, and prolongs the service life of the photovoltaic array.

Description

technical field [0001] The invention belongs to the technical field of photovoltaic grid-connected power generation, and relates to a photovoltaic grid-connected current and DC voltage secondary ripple suppression control system and control method for improving the quality of grid-connected current. Background technique [0002] The photovoltaic grid-connected power generation system consists of two parts: a photovoltaic array and an inverter. The photovoltaic array converts solar energy into electrical energy, and the inverter injects electrical energy into the AC grid. Single-phase single-stage photovoltaic grid-connected inverter adopts single-stage energy conversion link, which has the advantages of simple structure, low cost and high system efficiency. Therefore, it has good application and research prospects in household photovoltaic power generation systems. Traditional single-phase single-stage photovoltaic grid-connected inverters, when the grid-connected current is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/48
CPCY02E10/56
Inventor 张富洲王修庞郭旭李吉浩于晶荣陈莎李冬雪罗道军
Owner NANYANG POWER SUPPLY COMPANY OF STATE GRID HENAN ELECTRIC POWER
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