A control method for improving the output utilization rate of photovoltaic panels

A technology of photovoltaic panels and control methods, applied in photovoltaic power generation, electrical components, circuit devices, etc., can solve the problem of immature optimization of the matching connection between photovoltaic arrays and inverters on the DC side, increased grid instability, and grid-connected harmonics. High wave distortion rate and other problems, to achieve the effect of improving output utilization, reducing system loss, and reducing harmonic content

Active Publication Date: 2021-03-19
YANSHAN UNIV
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Problems solved by technology

Distributed power generation mainly uses string inverters to generate power. Under the influence of light changes, there are still problems such as low power generation efficiency, high grid-connected harmonic distortion rate, and large system loss, which reduces economic benefits to a certain extent. , increasing grid instability;
[0003] At present, most of the improvement of photovoltaic system performance is to optimize the photovoltaic system equipment, etc., and the optimization of the matching connection between the photovoltaic array and the inverter on the DC side is still immature

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  • A control method for improving the output utilization rate of photovoltaic panels
  • A control method for improving the output utilization rate of photovoltaic panels
  • A control method for improving the output utilization rate of photovoltaic panels

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Embodiment Construction

[0039]The present invention will be described in further detail below in conjunction with accompanying drawing and specific embodiment, but not as limiting the present invention;

[0040] A control method for improving the output utilization rate of photovoltaic panels according to the present invention, according to figure 1 The flow chart of the switching program of the photovoltaic grid-connected system, figure 2 The DC side switching topology shown and image 3 The overall topology diagram of the photovoltaic grid-connected system shown shows that the DC side current of the PV panel is output to the inverter, and the switching device maximizes the function by switching the number of inverters. If it is judged that the function value after switching is greater than the original function value, then Automatically switch the number of inverters, gradually increase the number of inverters, and improve the operating performance of the photovoltaic system;

[0041] The contro...

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Abstract

The invention discloses a control method for improving the output utilization rate of a photovoltaic cell panel. The control method is based on a direct-current-side switching topological structure ofa photovoltaic grid-connected system. The overall topological structure of the photovoltaic grid-connected system is as follows: a photovoltaic array and an inverter are connected by a switching device including an on-off device, a controller, and a signal acquisition processor. The control method comprises: a photovoltaic system parameter and a direct-current-side real-time current and voltage are obtained; numerical values of output powers of N series of cell panels are grouped and a cell panel output utilization rate objective function is constructed; and the switching device switches theinverter path number automatically based on the objective function, so that the photovoltaic system works in an optimal state all the time. According to the invention, in order to solve the low illumination problem and partial shadow problem of the cell panel, the control method enables the direct-current-side circuit to be switched to improve the output utilization rate of the photovoltaic cell panel.

Description

technical field [0001] The invention relates to the technical field of photovoltaic power generation system planning, in particular to a control method for improving the output utilization rate of photovoltaic panels. Background technique [0002] In recent years, photovoltaic power generation technology is one of the rapidly developing renewable clean energy technologies. The two main power generation methods of photovoltaic power generation are distributed power generation and centralized power generation, and the former is becoming more and more popular in the international market. Distributed power generation mainly uses string inverters to generate power. Under the influence of light changes, there are still problems such as low power generation efficiency, high grid-connected harmonic distortion rate, and large system loss, which reduces economic benefits to a certain extent. , increasing grid instability; [0003] At present, improving the operating performance of p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/10
CPCH02J3/383H02J3/01H02J2203/20Y02E10/56Y02E40/40
Inventor 王珺薛世伟孙玲玲王宁贾清泉
Owner YANSHAN UNIV
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