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Grid-connected photovoltaic inverter MPPT control method capable of adjusting output power along with power grid frequency

A photovoltaic inverter and output power technology, which is applied in the direction of photovoltaic power generation, single-network parallel feeding arrangement, etc., can solve the problems that do not involve the method of adjusting the output power and cannot meet the technical requirements

Inactive Publication Date: 2016-08-03
SHANGHAI MARITIME UNIVERSITY
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Problems solved by technology

[0005] Existing MPPT control methods, such as constant voltage method, disturbance observation method, conductance incremental method, etc., can only track the maximum power point of the solar panel at all times, and do not involve the method of adjusting the output power according to the grid frequency, which cannot meet the latest proposed Related Technical Requirements

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  • Grid-connected photovoltaic inverter MPPT control method capable of adjusting output power along with power grid frequency
  • Grid-connected photovoltaic inverter MPPT control method capable of adjusting output power along with power grid frequency
  • Grid-connected photovoltaic inverter MPPT control method capable of adjusting output power along with power grid frequency

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Embodiment Construction

[0038] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0039] The invention provides a hardware device for a grid-connected photovoltaic inverter MPPT control method capable of adjusting output power according to the frequency of the grid, including a solar battery panel, a photovoltaic inverter, a grid, and an MPPT controller. The solar panel, photovoltaic inverter and grid are connected in sequence, and the MPPT controller is connected with the solar panel, photovoltaic inverter and grid.

[0040] The photovoltaic inverter can be single-phase single-stage photovoltaic inverter, single-phase multi-stage photovoltaic inverter, three-phase single-stage photovoltaic inverter or three-phase multi-stage photovoltaic inverter, including inverter circuit, filter circuit, Some occasions also include transformer circuits. The MPPT controller is preferably a DSP controller.

[0041] Using the MPPT control...

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Abstract

The invention provides a grid-connected photovoltaic inverter MPPT control method capable of adjusting output power along with power grid frequency. The method comprises steps: power grid voltage and output current of an inverter are acquired, and the power grid frequency and the current output power of the inverter are calculated; the relationship between the current power grid frequency and limited frequency is judged, and a different adjusting method is adopted according to the current power grid frequency. The method has the advantages that the output power can be dynamically adjusted according to changes of the power grid frequency; if in a limited frequency range, the traditional MPPT control method is adopted; and if exceeding the limited frequency, the output power is linearly reduced according to the changes of the power grid frequency, and related requirements of a photovoltaic grid-connected power generation system can be met.

Description

technical field [0001] The invention belongs to the field of MPPT control of grid-connected photovoltaic inverters, and relates to an MPPT control method of grid-connected photovoltaic inverters capable of adjusting output power according to grid frequency. Background technique [0002] In 2011, the German VDE issued a technical application guideline on the parallel operation of low-voltage power grids. The upper frequency limit for the forced disconnection of photovoltaic grid-connected power generation systems and low-voltage power grids is no longer 50.2Hz, but between 50.3Hz and 51.5Hz. In the Hz frequency range, select the frequency upper limit point with a step size of 0.1 Hz. At the same time, it is required that within the frequency range of 50.2Hz to 51.5Hz, the active power is as follows figure 2 As shown, the slope line decreases linearly, and its active power increment is, [0003] ΔP=40%*P M *(fo-50.2). [0004] Among them, PM represents the output active po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38
CPCY02E10/56
Inventor 耿攀薛士龙刘以建方亮季昌琳胡雅
Owner SHANGHAI MARITIME UNIVERSITY
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