A DC topology structure and control method for improving the utilization efficiency of photovoltaic inverters
A photovoltaic inverter and topology technology, applied in photovoltaic power generation, AC network circuits, electrical components, etc., can solve the immature optimization of the matching connection between the DC side photovoltaic array and the inverter, increase grid instability, reduce Economic benefits and other issues, to achieve the effect of improving output utilization efficiency, improving utilization efficiency, and increasing economic benefits
Active Publication Date: 2020-09-11
YANSHAN UNIV
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Problems solved by technology
At this stage, my country encourages the development of distributed power generation. In distributed power generation, string inverters are mainly used to generate power. Under the influence of light changes, there is still the problem of low power generation efficiency, which reduces economic benefits to a certain extent and increases 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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[0031] 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;
[0032] A DC topology structure and control method for improving the utilization efficiency of photovoltaic inverters according to the present invention, according to figure 1 The DC side switching topology shown and figure 2 The overall topology diagram of the photovoltaic system, the PV DC side current is output to the inverter, and the switching device switches the number of inverters to maximize the objective function. If it is judged that the function value after switching is greater than the original function value, the number of inverters will be automatically switched, and the number of inverters will be gradually increased to improve the operating performance of the photovoltaic system;
[0033] A DC topology to improve the utilization efficiency of photovoltaic inverters, such as figur...
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The invention discloses a direct-current topological structure for improving the utilization efficiency of a photovoltaic inverter and a control method thereof. The topological structure is composed of a photovoltaic array, an inverter and a switching device. The photovoltaic array and the inverter are connected through a switching device formed by an on-off device, a controller, and a signal acquisition processor. A first cell panel string is connected with cell panel strings from a second one to an Nth one respectively by switches; the second cell panel string is connected with the cell panel string from the third one to the Nth one respectively by switches; the third cell panel string is connected with cell panel string from the fourth one to the Nth one respectively by switches; and the operation is done in the same manner until the (N-1)th cell panel string is connected with the Nth cell panel string by one switch. At the outlet, adjacent to the inverter, of the on-off device, each cell panel string is connected with the inverter by one switch. According to the invention, in order to solve the low illumination and partial shadow problems of the cell panel, the direct-current-side circuit is switched to improve the output utilization efficiency of the photovoltaic inverter.
Description
technical field [0001] The invention relates to the technical field of photovoltaic power generation system planning, in particular to a DC topology structure and a control method for improving the utilization efficiency of photovoltaic inverters. Background technique [0002] In recent years, photovoltaic power generation technology is one of the rapidly developing renewable clean energy technologies. For photovoltaic power generation, the main two types of power generation are distributed power generation and centralized power generation. At this stage, my country encourages the development of distributed power generation. In distributed power generation, string inverters are mainly used to generate power. Under the influence of light changes, there is still the problem of low power generation efficiency, which reduces economic benefits to a certain extent and increases grid instability; [0003] At present, improving the operating performance of photovoltaic systems is m...
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IPC IPC(8): H02J3/38
CPCH02J3/383H02J2203/20Y02E10/56
Inventor 贾清泉薛世伟王宁孙玲玲
Owner YANSHAN UNIV