Multi-path MPPT inverter current sharing control method under same input source condition

An inverter and input source technology, applied in the field of multi-channel MPPT photovoltaic inverter Boost control, can solve the problems of not being able to age the inverter, not being able to quickly find the quality problem of the inverter, and not being able to screen the inverter, etc. The effect of reducing aging costs

Inactive Publication Date: 2018-05-29
JIANGSU EVER SOLAR NEW ENERGY CO LTD
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  • Abstract
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  • Application Information

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Problems solved by technology

For example, if there is uneven current during the aging process, the inverter cannot be effectively aged, the inverter cannot be effectively screened, and the quality problems of the inverter cannot be quickly found

Method used

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  • Multi-path MPPT inverter current sharing control method under same input source condition
  • Multi-path MPPT inverter current sharing control method under same input source condition
  • Multi-path MPPT inverter current sharing control method under same input source condition

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Embodiment Construction

[0029] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art. It should be noted here that the descriptions of these embodiments are used to help understand the present invention, but are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below may be combined with each other as long as they do not constitute a conflict with each other.

[0030] This embodiment provides a multi-channel MPPT inverter current sharing control method under the same input source condition. At the same time, the current sharing control is performed on each MPPT controller on the DC side, aiming to solve the problem of normal and stable operation of multiple MPPT inverters under the same input source conditi...

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Abstract

The invention discloses a multi-path MPPT inverter current sharing control method under the same input source condition. The multi-path MPPT inverter current sharing control method comprises the stepsof: S1, connect multi-path MPPT inverters to the same input source in parallel; S2, determining whether the current condition is the same input source condition; S3, selecting one path from the multi-path MPPT as a reference MPPT path; S4, acquiring a voltage loop reference of the reference MPPT path, acquiring a current loop reference according to a PV voltage and the voltage loop reference of the reference MPPT path, and acquiring a Boost control PWM duty ratio output by the reference MPPT path according to the current loop reference and a PV current of the reference MPPT path; S5, acquiring Duty (delta) according to PV currents of the rest MPPT paths and the PV current of the reference MPPT path that pass through a compensation controller separately, and acquiring Boost control PWM duty ratios output by the rest MPPT paths by combining with the Boost control PWM duty ratio of the reference MPPT path.

Description

technical field [0001] The invention relates to the field of Boost control of multi-channel MPPT photovoltaic inverters, in particular to a current sharing control method between MPPTs on the DC side of a multi-channel MPPT photovoltaic inverter under the same input source (like a DC power supply). Background technique [0002] In the multi-channel MPPT photovoltaic inverters currently on the market, generally only one MPPT can correspond to a single input source, and if multiple MPPTs are connected to the same input source, the uneven current flow of each MPPT or even stable operation cannot be achieved. The specifications of most photovoltaic inverters clearly indicate that they do not support the working mode of multiple MPPTs connected to the same input source. For low-power photovoltaic inverters, there is a need to connect to the same input source at the application site; for medium-power (20KW to 60KW) inverters, there is also a need to connect to the same input Road...

Claims

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Application Information

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IPC IPC(8): H02M7/493H02J3/38
CPCH02J3/385H02M7/493Y02E10/56
Inventor 王进城肖留杰
Owner JIANGSU EVER SOLAR NEW ENERGY CO LTD
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