Household photovoltaic power generation system and grid-connected point voltage control method thereof
A voltage control method and power generation system technology, which are applied in photovoltaic power generation, AC network voltage adjustment, electrical components, etc., can solve the problem of easy over-limit voltage at the grid connection point, reduce the voltage at the grid connection point, reduce the frequency of over-limit, reduce The effect of the frequency of the grid connection point voltage exceeding the limit
Active Publication Date: 2020-10-16
STATE GRID HEBEI ELECTRIC POWER RES INST +2
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[0005] In view of this, the embodiment of the present application provides a household photovoltaic power generation system and its grid-connected point voltage control method, which solves the technical problem that the grid-connected point voltage of the household photovoltaic power generation system easily exceeds the limit in the prior art
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[0050] In the following description, specific details such as specific system structures and technologies are presented for the purpose of illustration rather than limitation, so as to thoroughly understand the embodiments of the present application. It will be apparent, however, to one skilled in the art that the present application may be practiced in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present application with unnecessary detail.
[0051] Reference to "one embodiment" or "some embodiments" or the like in the specification of the present application means that a particular feature, structure, or characteristic described in connection with the embodiment is included in one or more embodiments of the present application. Thus, appearances of the phrases "in one embodiment," "in some embodiments," "in other embodim...
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The invention belongs to the technical field of new energy power generation, and provides a household photovoltaic power generation system and a grid-connected point voltage control method thereof. The method comprises the steps: after the photovoltaic inverter operates in a grid-connected mode, enabling a photovoltaic inverter to monitor the voltage of a grid-connected point; under the conditionthat the grid-connected point voltage is greater than a first threshold value, enabling the photovoltaic inverter to absorb reactive power; when the reactive power absorbed by the photovoltaic inverter reaches a second threshold value and the grid-connected point voltage is greater than the first threshold value, adjusting the active power of the photovoltaic inverter until the grid-connected point voltage meets a preset condition. According to the grid-connected point voltage control method of the household photovoltaic power generation system provided by the embodiment of the invention, theadjustment of the grid-connected point voltage is realized based on the photovoltaic inverter in the household photovoltaic power generation system, and when the grid-connected point voltage exceeds the preset threshold, the grid-connected point voltage can be effectively reduced, and the out-of-limit frequency of the grid-connected point voltage is effectively reduced.
Description
technical field [0001] The application belongs to the technical field of new energy power generation, and in particular relates to a household photovoltaic power generation system and a grid-connected point voltage control method thereof. Background technique [0002] With the development of the national new energy strategy and the awareness of energy conservation and emission reduction, household photovoltaic power generation has entered thousands of households. Household photovoltaic power generation systems refer to installations on buildings, structures or grounds belonging to residents, with an installed capacity of 30kWp or less. Yes, a photovoltaic power generation system connected to the public grid with a voltage level of 380V / 220V. [0003] Since the photovoltaic power supply is affected by natural conditions such as light, temperature and climate, the active power output by the household photovoltaic power generation system has large fluctuations. When it is conne...
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IPC IPC(8): H02J3/12H02J3/16H02J3/38H02J3/46H02J3/48H02J3/50
CPCH02J3/381H02J3/12H02J3/16H02J3/46H02J3/48H02J3/50H02J2300/24Y02E40/30
Inventor 王磊杨少波胡文平曾四鸣孟良李泉郭捷
Owner STATE GRID HEBEI ELECTRIC POWER RES INST