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High-efficiency photovoltaic power optimizer serial topology circuit and control method thereof

A power optimizer and topology circuit technology, applied in photovoltaic power generation, control/regulation systems, output power conversion devices, etc., can solve problems such as reducing circuit efficiency and increasing system construction costs, reducing production costs and stabilizing maximum power. Tracking deviations, the effect of improving system reliability and longevity

Inactive Publication Date: 2016-01-13
高海凌
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  • Description
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Problems solved by technology

However, adding a photovoltaic power optimizer to the photovoltaic power generation system will increase the construction cost of the system, and multi-level power conversion will be required, which will reduce the circuit efficiency, so that the power generation of the system may not increase but reverse when the state of the photovoltaic modules is similar. drop

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  • High-efficiency photovoltaic power optimizer serial topology circuit and control method thereof
  • High-efficiency photovoltaic power optimizer serial topology circuit and control method thereof
  • High-efficiency photovoltaic power optimizer serial topology circuit and control method thereof

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Embodiment Construction

[0026] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0027] Such as figure 2 As shown, the high-efficiency photovoltaic power optimizer series topology circuit includes a photovoltaic array 1, an optimizer 2, and an inductor 4. The output terminal of each photovoltaic array 1 is connected in parallel with an optimizer 2, and the first and last ends of all optimizers 2 are sequentially connected in series to form An optimizer component string, the optimizer component string is connected to the input end of the inverter after the inductor 4 and the third switch tube, the third switch tube includes a switch 3 and a third diode connected in parallel to the two ends of the switch 3 5. The anode of the third diode 5 is connected to the inductor 4, and the cathode of the third diode 5 is connected to the input terminal of the inverter.

[0028] Each optimizer 2 includes a first switching tube 6, a second switc...

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Abstract

The invention discloses a high-efficiency photovoltaic power optimizer serial topology circuit. The circuit comprises photovoltaic arrays, optimizers and an inductor. The output end of each photovoltaic array is connected in parallel with one optimizer, all the optimizers are successively connected in series in an end-to-end mode to form an optimizer assembly string, and the optimizer assembly string is connected with the input end of an inverter via the inductor and a third switch tube. According to the invention, the optimizers share one inductor so that deviations in maximum power point tracking due to instability of the optimizers can be inhibited, at the same time, the volume of the overall inductor is reduced, materials are reduced, and the manufacturing cost is decreased; and the output line of the optimizer assembly string is provided with the third switch tube, when circuit currents tend to flow back or the currents are zero, the third switch tube is switched off, the currents flow through a third diode, voltage reduction loss of diodes of the circuit is enabled to be eliminated as much as possible when the currents are not interrupted, and the system efficiency is improved. The invention further discloses a control method of a high-efficiency photovoltaic power optimizer serial topology circuit.

Description

technical field [0001] The invention relates to the field of new energy technologies, in particular to a high-efficiency photovoltaic power optimizer series topology circuit and a control method thereof. Background technique [0002] Photovoltaic power optimizers are mainly used in photovoltaic power plants that use multiple photovoltaic modules connected in series and parallel. The photovoltaic power optimizer is to solve the problem of inefficiency when some or all components of the inverter perform maximum power point tracking (MPPT) uniformly due to state differences among components in the power station. The structure after adding the photovoltaic power optimizer is to connect one or several photovoltaic modules in series and parallel at the front end of the original inverter, then perform DC / DC conversion through the photovoltaic power optimizer, and then realize DC / DC conversion through the inverter. AC DC / AC conversion, so it can realize the unified MPPT of one or s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/155
CPCY02E10/56
Inventor 高海凌
Owner 高海凌
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