Photovoltaic inverter inductance compensation control method

A photovoltaic inverter, compensation control technology, applied in photovoltaic power generation, irreversible DC power input conversion into AC power output and other directions, can solve the problems of system oscillation, high frequency loss, high efficiency, non-compliance with optimal design, etc. Achieve the effect of improving grid-connected stability and reliability, reducing system noise and power consumption, and improving system power generation efficiency

Active Publication Date: 2014-10-15
JIANGSU EVER SOLAR NEW ENERGY CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] (1) The low-frequency DC loss of the RMS current flowing through the DC internal resistance;
[0010] (2) High-frequency AC loss caused by the skin effect of the wire caused by the high-frequency AC component;
[0011] (3) Proximity effect high-frequency loss caused by high-frequency current skin effect between winding layers;
[0012] (4) The eddy current loss formed by the air gap leakage through the conductor
[0035] As mentioned above, many current inverter products try to increase the filter inductance as much as possible, and try to keep the inductance a

Method used

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  • Photovoltaic inverter inductance compensation control method
  • Photovoltaic inverter inductance compensation control method
  • Photovoltaic inverter inductance compensation control method

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Embodiment

[0062] Such as figure 1 Shown is a schematic diagram of the mechanism system of the photovoltaic power generation system, which includes a photovoltaic cell module 1 , an inverter module mainly composed of DC / DC2 and DC / AC3 , a controller 5 , and a power grid 4 . The direct current generated by the photovoltaic cell module 1 is converted by the inverter module to generate the required alternating current and merged into the grid 4. The controller 5 contains the information on the DC / AC3 side collected by the DSP (not shown in the figure) (the DC / AC side The real-time curve of the inductance changing with the grid-connected current) to control the inverter module.

[0063] The control unit in this technical solution is composed of a digital signal processor (Digital Signal Processor, DSP for short).

[0064] Such as figure 2 , as shown in 3, figure 2 It is the curve diagram of DC / DC side inductance changing with current, image 3 It is the curve diagram of DC / AC side indu...

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Abstract

The invention relates to a photovoltaic inverter inductance compensation control method. A transfer function is adjusted correspondingly through change of hardware nonlinear inductance and current to achieve nonlinear characteristic inductance compensation control. The current nonlinear inductance is adopted, inductance cost is reduced, size is compressed, system noise and power consumption are reduced, grid connection stability and reliability of a photovoltaic inverter are improved, and system power generation efficiency is improved. The method solves the problem of difficulty of the nonlinear characteristic inductance in an inverter control strategy, and the technical scheme can be applied to power electronic topological circuits of wind power inverters, uninterruptible power supplies (UPS) and the like.

Description

technical field [0001] The invention relates to a control method for a photovoltaic inverter, in particular to a compensation control method for the inductance of a photovoltaic inverter. Background technique [0002] Human beings are facing two major problems of energy and environment, and the development of renewable, clean and non-polluting alternative energy has become a top priority. Due to its own advantages, solar energy has attracted more and more people's attention, and has become a research hotspot all over the world. [0003] The advantages of solar energy are: the energy is huge, and there is a lot of room for utilization; the environment does not produce pollution, and it is a kind of clean energy; Concerned about the depletion of solar energy; ubiquitous and does not need to be mined and transported. [0004] At present, the overall power generation efficiency of the solar power generation system is mainly related to the solar cell efficiency, inverter effici...

Claims

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Application Information

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IPC IPC(8): H02M7/48
CPCY02E10/56
Inventor 张勇廖小俊舒成维李世军包有鹏金海燕
Owner JIANGSU EVER SOLAR NEW ENERGY CO LTD
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