A photovoltaic DC system and its low voltage ride through control method
A low-voltage ride-through and DC system technology, applied in the direction of parallel operation of DC power supplies, can solve problems such as off-grid, drop photovoltaic DC/DC converters, etc.
Active Publication Date: 2021-05-11
STATE GRID CORP OF CHINA +3
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Problems solved by technology
[0006] The purpose of the present invention is to provide a photovoltaic DC system and its low voltage ride-through control method, which is used to solve the problem that the photovoltaic DC / DC converter is off-grid due to the voltage drop of the DC bus in the photovoltaic DC grid-connected system
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[0040] The purpose of the present invention is to provide a photovoltaic direct current system and its low voltage ride-through control method, which is used to solve the problem that photovoltaic modules are disconnected from the grid due to the voltage drop of the direct current bus in the direct current grid-connected system.
[0041] To achieve the above object, the technical solution provided by the invention is:
[0042] A low-voltage ride-through control method for a photovoltaic DC system, comprising the following steps:
[0043] (1) Obtain the DC bus voltage and the power on the grid-connected side of the DC / DC converter after the voltage drop occurs, and use this power as the ride-through power;
[0044] (2) On the maximum power tracking curve of the photovoltaic module, search for the corresponding voltage value when the output power of the photovoltaic module is the ride-through power, and use the voltage value as the ride-through voltage of the corresponding photo...
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The present invention provides a photovoltaic DC system and its low voltage ride-through control method. When the DC bus voltage drops, the DC bus voltage and the ride-through power of the DC / DC converter are first obtained, and then according to the ride-through power, the maximum power of the photovoltaic module Search the corresponding voltage value when the output power of the photovoltaic module is the ride-through power on the tracking curve, use this voltage value as the ride-through voltage of the corresponding photovoltaic module, and finally control the output power and ride-through voltage of the photovoltaic module. The technical solution provided by the present invention does not need to change the original photovoltaic DC system when the DC bus voltage drops, and only needs to control the output of the photovoltaic module according to the power of the DC / DC grid-connected side, so that the DC The current on the grid-connected side of the / DC converter remains unchanged, and the DC bus will not have an impact on the DC / DC converter, thereby solving the problem of photovoltaic DC / DC converter off-grid.
Description
technical field [0001] The invention belongs to the technical field of photovoltaic power generation, and in particular relates to a photovoltaic DC system and a low-voltage ride-through control method thereof. Background technique [0002] With the increasing consumption of traditional energy and the increasingly serious environmental problems, people are looking for new energy sources that can replace traditional energy sources. Therefore, as clean, non-polluting and renewable energy sources such as wind energy and solar energy have attracted more and more attention. [0003] Solar power generation is a technology that uses the photovoltaic effect of photovoltaic modules to convert solar energy into electrical energy. Solar power generation equipment mainly includes three parts: photovoltaic modules, controllers, and inverters / converters. The photovoltaic modules include solar panels, The solar panels are packaged and protected after being connected in series to form a lar...
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IPC IPC(8): H02J1/10
CPCH02J1/10
Inventor 张旭升李瑞生徐军郭宝甫田盈王强
Owner STATE GRID CORP OF CHINA