Adaptive precise harmonic compensation method and device based on photovoltaic grid-connected system

A technology that refines harmonics and compensation methods. It is used in harmonic reduction devices, AC networks to reduce harmonics/ripples, photovoltaic power generation, etc. It can solve problems such as pollution, reduce compensation costs, and make full use of the effect of reducing

Inactive Publication Date: 2018-11-02
CENT SOUTH UNIV
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Problems solved by technology

At present, there is no existing technology research. When the current remaining capacity cannot meet the compensation requirements for all sub-harmonics, the compensation scheme is adjusted in real time according to the dynamically changing remaining capacity, and only the harmonic components that cause pollution to the grid side are compensated.

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  • Adaptive precise harmonic compensation method and device based on photovoltaic grid-connected system
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  • Adaptive precise harmonic compensation method and device based on photovoltaic grid-connected system

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Embodiment Construction

[0029] The specific implementation manners of the present invention will be further described below in conjunction with the drawings and examples. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.

[0030] figure 1 It is a schematic flowchart of an adaptive fine harmonic compensation method based on a photovoltaic grid-connected system according to an embodiment of the present invention. refer to figure 1 , the method includes:

[0031] S1. The maximum power tracking MPPT controller in the photovoltaic system adjusts the output current and output voltage of the photovoltaic inverter according to the external lighting environment to ensure that the photovoltaic grid-connected inverter works at the maximum power tracking point, and detects the The output current and output voltage of the AC side of the photovoltaic grid-connected inverter;

[0032] S...

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Abstract

The invention discloses an adaptive precise harmonic compensation method based on a photovoltaic grid-connected system. The method comprises the following steps: detecting output current and an outputvoltage on an AC side of a photovoltaic grid-connected inverter when the photovoltaic grid-connected inverter works at a maximum power tracking point; detecting the remaining capacity of the photovoltaic grid-connected inverter, judging the active power flow directions of different subharmonics, and formulating a compensation strategy; adaptively outputting a to-be-compensated component switch on-off signal according to the remaining capacity of the photovoltaic grid-connected inverter; and achieving precise harmonic compensation by using a repeated double closed-loop controller according tothe switch on-off signal. According to the adaptive precise harmonic compensation method disclosed by the invention, the remaining capacity of the inverter is dynamically tracked according to the external illumination changes, the compensation cost of the photovoltaic inverter can be effectively reduced, and the distortion rate of the grid side harmonics is maximally reduced while making full useof the limited remaining capacity of the photovoltaic grid-connected inverter.

Description

technical field [0001] The invention relates to the field of photovoltaic grid-connected power generation systems, in particular to an adaptive fine harmonic compensation method based on a photovoltaic grid-connected system. Background technique [0002] Photovoltaic grid-connected power generation system, as a typical application of new energy, can be seen in major cities and even remote areas in my country. Photovoltaic grid-connected power generation devices generally work during the day when there is sufficient sunlight, and are generally disconnected from the grid at night. Such frequent and multiple switching of photovoltaic grid-connected devices is not conducive to the work of the equipment, and will also bring large switching losses, which is also not conducive to the stable operation of the power grid. In practical industrial applications, if two devices are used in one system at the same time, The economic cost is relatively high, and it does not take advantage o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/01H02J3/38
CPCH02J3/01H02J3/385Y02E10/56Y02E40/40
Inventor 桂宁裘智峰赵鑫涛桂卫华
Owner CENT SOUTH UNIV
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