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Suppression method for output current harmonic waves of single-phase grid-connected inverter

An output current and inverter technology, which is applied in the field of suppression of output current harmonics of single-phase grid-connected photovoltaic inverters, can solve problems such as not being able to eliminate harmonic currents well, and achieve the effect of removing output current harmonics

Active Publication Date: 2016-02-17
ALTENERGY POWER SYST
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Problems solved by technology

Therefore, the existing single-phase grid-connected harmonic suppression method still cannot eliminate the harmonic current very well

Method used

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  • Suppression method for output current harmonic waves of single-phase grid-connected inverter
  • Suppression method for output current harmonic waves of single-phase grid-connected inverter
  • Suppression method for output current harmonic waves of single-phase grid-connected inverter

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Embodiment Construction

[0029] The present invention will be further described below in conjunction with specific embodiment and accompanying drawing, set forth more details in the following description so as to fully understand the present invention, but the present invention can obviously be implemented in many other ways different from this description, Those skilled in the art can make similar promotions and deductions based on actual application situations without violating the connotation of the present invention, so the content of this specific embodiment should not limit the protection scope of the present invention.

[0030] image 3 It is a flowchart of an embodiment of the present invention; Figure 4 It is a signal processing and control flowchart of an embodiment of the present invention. It should be noted that these and other subsequent drawings are only examples, which are not drawn according to the same scale, and should not be taken as limitations on the protection scope of the act...

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Abstract

The invention provides a suppression method for output current harmonic waves of a single-phase grid-connected inverter. The suppression method comprises the steps that sampled voltage of a direct-current bus is subjected to signal processing to obtain a feedback signal Vdc, the feedback signal Vdc is compared with a reference value Vdcref of the direct-current bus to obtain a direct-current bus error signal, and a grid-connected current amplitude reference signal I* is obtained after PI regulation; the grid-connected current amplitude reference signal I* is multiplied by a sine table sin(omega t) of voltage passing across a phase-locked power grid to obtain a grid-connected current reference signal igridref, a feedback signal igrid obtained after signal processing is carried out on sampled grid-connected current is compared with the grid-connected current reference signal igridref to obtain a grid-connected current error signal, a grid-connected current modulating signal is obtained after PI regulation, a power grid voltage feedforward signal and reverse polar harmonic current -ih are added, and a final modulating signal vreg is obtained. By means of the suppression method for the output current harmonic waves of the single-phase grid-connected inverter, the output current harmonic waves of the single-phase grid-connected inverter can be effectively eliminated.

Description

technical field [0001] The invention relates to the technical field of photovoltaic systems, in particular, the invention relates to a method for suppressing output current harmonics of a single-phase grid-connected photovoltaic inverter. Background technique [0002] As the installed capacity of photovoltaic grid-connected systems continues to increase, the impact of its output on the quality of the grid is becoming more and more obvious. The output current harmonics of photovoltaic inverters are an important factor affecting the quality of the power grid, and suppressing this factor has become an important requirement for photovoltaic inverters. [0003] figure 1 It is a control block diagram of a single-phase grid-connected inverter in the prior art. As shown in the figure, in the traditional scheme, since PI (Proportion Integration, proportional integral) control is used in the AC system, there is a static error control. It can be seen from the figure that once the gri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/12
CPCH02M1/126
Inventor 罗宇浩祁飚杰
Owner ALTENERGY POWER SYST
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