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Compensation method of direct current (DC) voltage fluctuation of photovoltaic grid-connected inverter

A technology of DC voltage and compensation method, applied in photovoltaic power generation, conversion of AC power input to DC power output, electrical components, etc., can solve the problem of affecting the quality of grid-connected current, unavoidable secondary pulsating voltage, and inability to completely eliminate pulsating grid-connected Current and other issues

Active Publication Date: 2011-08-10
上海英孚特电子技术有限公司 +1
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AI Technical Summary

Problems solved by technology

However, the output power of a single-phase grid-connected inverter is secondary pulsating power, while the output power of photovoltaic modules is a constant power, which inevitably requires an energy storage device to store and release energy. The flyback grid-connected inverter stores energy through the input side Capacitors achieve power matching, which inevitably causes secondary pulsating voltages to form on the DC side capacitors, resulting in pulsating currents in the grid-connected current, which affects the quality of grid-connected current
Generally, the traditional method reduces the DC pulsating voltage by increasing the capacitor capacity, but this method not only increases the cost and volume of the system, but also cannot completely eradicate the DC pulsating voltage, and it cannot completely eliminate the pulsating grid-connected current caused by the DC pulsating voltage.

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  • Compensation method of direct current (DC) voltage fluctuation of photovoltaic grid-connected inverter
  • Compensation method of direct current (DC) voltage fluctuation of photovoltaic grid-connected inverter

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Embodiment Construction

[0017] Preferred embodiments of the present invention are described in detail as follows in conjunction with accompanying drawings:

[0018] A method for compensating DC voltage fluctuations of photovoltaic grid-connected inverters, comprising the following steps,

[0019] (1) The single-phase grid-connected inverter generates a secondary pulsating voltage on the input side;

[0020] (2) A DC voltage pulsation compensation module is added to the front stage DC / AC high-frequency conversion link, and the DC pulsation voltage signal on the input side is fed back to the DC voltage pulsation compensation module;

[0021] (3) The DC voltage pulsation compensation module generates a pulsation compensation signal ΔD according to the feedback pulsation voltage signal;

[0022] (4) The pulsation compensation signal ΔD and the control signal D generated by the DC / AC high-frequency control module are superimposed to generate the control signal Dref of the switching tube, and the Dref sig...

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Abstract

The invention provides a compensation method of direct current (DC) voltage fluctuation of a photovoltaic grid-connected inverter, and the method can be used for improving the quality of the grid-connected current through compensating an input DC side secondary pulse voltage by adding a DC voltage pulse compensation module in a DC / AC (direction current / alternating current) high-frequency link, and eliminating a grid-connected current harmonic wave caused by the DC voltage pulse. The control performance of the system can be improved without adding a filter device and adding any extra appliance.

Description

Technical field: [0001] The invention belongs to the technical field of solar grid-connected power generation, and in particular relates to a method for compensating DC voltage fluctuations of a photovoltaic grid-connected inverter. Background technique: [0002] The micro-grid-connected inverter with distributed maximum power point tracking (MPPT) can effectively improve the power generation efficiency of the system due to the MPPT control of each photovoltaic module. , and the flyback grid-connected inverter has the characteristics of simple structure and high reliability, and is widely used in micro-grid-connected inverters as a typical circuit structure. However, the output power of a single-phase grid-connected inverter is secondary pulsating power, while the output power of photovoltaic modules is a constant power, which inevitably requires an energy storage device to store and release energy. The flyback grid-connected inverter stores energy through the input side Ca...

Claims

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Application Information

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IPC IPC(8): H02M7/5395
CPCY02E10/56
Inventor 黄建明吴春华杨宇徐坤
Owner 上海英孚特电子技术有限公司
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