A photovoltaic grid-connected control system
A control system, photovoltaic technology, applied in photovoltaic power generation, single-grid parallel feeding arrangement, etc., can solve problems such as shortening the service life of AC load, damage to AC load, etc.
Active Publication Date: 2016-05-11
STATE GRID YANCHENG POWER SUPPLY +4
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Problems solved by technology
Since the light intensity is changing all the time, the light energy received and utilized by the photovoltaic system is also changing, so the amount of electric energy generated is not fixed, and the voltage required for the normal operation of the AC load is certain. If the photovoltaic system All the generated electric energy is directly supplied to the AC load, which may cause varying degrees of damage to the AC load due to too high or too low voltage, shortening the service life of the AC load
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[0016] The present invention will be further described in detail below in conjunction with the accompanying drawings, so that those skilled in the art can implement it with reference to the description.
[0017] Such as figure 1 As shown, the present invention provides a photovoltaic grid-connected control system, including:
[0018] Photovoltaic modules, which convert the received solar radiation energy into high-voltage direct current through high-frequency direct current, a solar cell can only generate a voltage of about 0.5V, which is far lower than the voltage required for actual use. In order to meet the required voltage for actual use, it is necessary to The solar cells are connected into modules;
[0019] Inverter, which inverts the high-voltage direct current output by the photovoltaic module into sinusoidal alternating current. Since the solar cell emits direct current, and the general load is an alternating current load, an inverter is required to invert the high-v...
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The invention relates to the field of photovoltaic power generation, and especially relates to a photovoltaic grid connection control system. The photovoltaic grid connection control system comprises: a photovoltaic assembly; an inverter; and alternating-current load and the grid which are used to receive a sinusoidal alternating current transmitted by the inverter, wherein a transformer is arranged between the grid and the alternating-current load; and a DSP controller, wherein the input end of the DSP controller is electrically connected with the output end of the inverter through a voltage sampling device, the output end of the DSP controller is electrically connected the alternating-current load and the grid separately, the voltage sampling device is used to acquire the voltage value of the sinusoidal alternating current transmitted by the inverter on a real-time basis and transfer the acquired voltage value to the DSP controller, the DSP controller is used to compare the voltage value transferred by the voltage sampling device and the rated voltage value required by the alternating-current load, and the connection of the alternating-current load and the grid is controlled through a plurality of function diverter switches. According to the invention, a voltage of a corresponding value is transmitted according to the needs of the alternating-current load, so the damage on the alternating-current load due to an over-high or over-low transmitted voltage can be reduced to the maximum extent, and the service life of the alternating-current load can be prolonged.
Description
technical field [0001] The invention relates to the field of photovoltaic power generation, in particular to a photovoltaic grid-connected control system. Background technique [0002] The photovoltaic grid-connected power generation system is that the solar photovoltaic power generation system is connected to the conventional power grid to jointly undertake the power supply task. When there is sunlight, the inverter inverts the direct current generated by the photovoltaic system into sinusoidal alternating current, and the generated alternating current can be directly supplied to the alternating current load, and then the remaining electric energy is input into the grid, or all the generated electric energy is directly integrated into the grid. When there is no sun, all load electricity is supplied by the grid. Since the light intensity is changing all the time, the light energy received and utilized by the photovoltaic system is also changing, so the amount of electric en...
Claims
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IPC IPC(8): H02J3/38
CPCY02E10/56
Inventor 张怡
Owner STATE GRID YANCHENG POWER SUPPLY