Photovoltaic grid-connected inverter control method based on active power reserve

A technology of photovoltaic inverter and control method, which is applied in the direction of photovoltaic power generation, control/regulation system, output power conversion device, etc., and can solve problems such as power grid excess

Active Publication Date: 2020-09-01
HEFEI UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] The purpose of the present invention is to provide a photovoltaic grid-connected inverter control method based on active power backup in view of the problem that traditional photovoltaic inverters can only output power in the manner of maximum power tracking, resulting in excess power in the grid. A power loop is added between the current loops, and seamless switching between maximum power tracking and power control is realized. The switching conditions are determined by the fitting peak judgment method, and the active power backup of the traditional photovoltaic inverter is realized.

Method used

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  • Photovoltaic grid-connected inverter control method based on active power reserve
  • Photovoltaic grid-connected inverter control method based on active power reserve
  • Photovoltaic grid-connected inverter control method based on active power reserve

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Embodiment Construction

[0087] The present embodiment will be specifically described below in conjunction with the accompanying drawings.

[0088] figure 1It is the grid-connected structural diagram of the photovoltaic inverter according to the embodiment of the present invention. The specific parameters are as follows: the number of the inverter is #i=1. The rated output line voltage of inverter #i is 380V / 50Hz, and the DC side filter capacitor C in =15mF, filter inductance L on bridge arm side f =0.06mH, AC measurement filter capacitance C f =300uF, the filter inductance value of the grid side is L g =0.02mH, the rated capacity of the inverter is 500KVA. Inverter #1 wiring impedance is Z L =0.001+j0.001Ω.

[0089] figure 2 It is a block diagram of the control structure of the photovoltaic inverter according to the embodiment of the present invention. It can be seen from the figure that the steps of the control method of the present invention are as follows:

[0090] Step 1. Set the number...

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Abstract

The invention discloses a photovoltaic grid connected inverter control method based on active power backup. According to the method, a traditional photovoltaic inverter is improved, a power ring is added between a voltage ring and a current ring, and seamless switching between maximum power tracking and active power backup state can be achieved through direct-current voltage ring and direct powerring control. By combining a fitting peak value judging method and a maximum power tracking control method, the maximum power point is determined, maximum power tracking is rapidly and seamlessly switched into the active backup state, and a traditional photovoltaic inverter achieves the active power backup function.

Description

technical field [0001] The invention belongs to the field of photovoltaic inverter grid-connected control, and in particular relates to a photovoltaic grid-connected inverter control method based on active power backup. Background technique [0002] With the deterioration of the environment, the aggravation of the energy crisis, technological progress, and the reduction of device production costs, new energy generation technologies such as photovoltaics and wind power have developed rapidly and become research hotspots at home and abroad. [0003] At present, photovoltaic power generation systems mostly adopt the method of maximum power tracking (MPPT) to connect to the grid. Compared with traditional synchronous generators, photovoltaic power generation systems have fast response speed, simple and flexible control, and can maximize the use of light energy. However, the photovoltaic power generation system "just generates power, regardless of the grid", resulting in excess g...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38H02M7/48H02M7/5387G05F1/67
CPCG05F1/67H02J3/385H02M7/48H02M7/5387Y02B70/10Y02E10/56
Inventor 张兴张海峥李明李飞陈巧地刘晓玺
Owner HEFEI UNIV OF TECH
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