Input source intelligent identification method applied to new energy hybrid inverter
A hybrid inverter and intelligent identification technology, applied in the field of automatic identification, can solve the problems of inverter curing and inability to meet diverse customer needs, and achieve the effects of improving reliability, reducing operational complexity, and improving efficiency.
Active Publication Date: 2017-03-29
GOODWE TECHNOLOGIES CO LTD
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Problems solved by technology
The traditional grid-connected wind-solar hybrid controller has the following problems: the input of the inverter is fixed relative to the channel, which cannot be freely configured by the user or requires complex manual settings through buttons, which cannot meet diverse customer needs
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Embodiment 1
[0021] Example 1: The connection method of photovoltaic panels, wind generators and grid-connected inverters is as follows figure 1 As shown, the DC generated by the battery can be connected to the input terminal of the inverter. Therefore, if the inverter is connected to multiple input sources, it is necessary to use a certain identification method to determine the type of the current input source. The three-phase AC power generated by wind turbines is usually rectified by a three-phase rectifier bridge and then sent to the input terminal of the inverter. However, this DC voltage is not a smooth DC voltage like the voltage generated by photovoltaic panels. Assuming wind power The frequency of the three-phase voltage output by the generator is 10Hz, then an AC component with a frequency of 30Hz will be superimposed on the rectified DC voltage. The amplitude of this AC component mainly depends on the value of the filter capacitor behind the rectifier bridge and the applied load ...
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The invention relates to an input source intelligent identification method applied to a new energy hybrid inverter. The method comprises the steps of: before and after a direct-current voltage loop is operated by the inverter, respectively collecting an alternating-current component of signals input by a current input source of the inverter, obtaining a first sampling voltage and a second sampling voltage, and calculating the difference of the first sampling voltage and the second sampling voltage; according to the comparison between the difference and a first voltage threshold, selecting a wind power generation input source to serve as the current input source; obtaining an input P / U curve of a photovoltaic cell panel power generation input source, calculating the difference of a power maximum value and a power minimum value and the difference of a voltage maximum value and a voltage minimum value, comparing the differences respectively with a preset power threshold and a preset second voltage threshold, and selecting the photovoltaic cell panel power generation input source or a storage battery input source to serve as the current input source. According to the invention, the type of the current input source of the inverter can be selected and determined, so that the inverter can be conveniently switched to a suitable work mode, the operation complexity is reduced for a client, the efficiency of the system is improved, and the reliability of the system is improved.
Description
technical field [0001] The invention belongs to the field of new energy power generation, and in particular relates to an automatic identification method applied in an inverter to determine the type of an input source. Background technique [0002] With the development of energy conservation, emission reduction and low-carbon economy, the application of renewable energy and clean energy is vigorously advocated, and various wind power and photovoltaic power generation devices have been widely used in various engineering practices. Because these two power generation systems are greatly affected by weather conditions, the power generation is very unstable. If the two power generation systems can be combined, the power generation efficiency and power supply stability will be improved. Because wind energy and solar energy have a certain complementarity in time and region, the wind is weaker when the sun is shining the strongest during the day, and the wind is generally stronger i...
Claims
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IPC IPC(8): H02J3/38
Inventor 黄敏方刚蒋峰
Owner GOODWE TECHNOLOGIES CO LTD