Compound control method of photovoltaic grid-connected inverter

A composite control and inverter technology, applied in photovoltaic power generation, single grid parallel feeding arrangement, conversion of AC power input to DC power output, etc., can solve the problem of poor waveform quality and total harmonic distortion of inverter output current It can improve the dynamic performance, suppress the periodic disturbance, and ensure the stability.

Inactive Publication Date: 2012-12-19
WOLONG ELECTRIC GRP CO LTD +2
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Problems solved by technology

However, although the traditional inverter control method based on voltage and current double-closed-loop PI control can meet the control performance requirements of the system to a certa...

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  • Compound control method of photovoltaic grid-connected inverter
  • Compound control method of photovoltaic grid-connected inverter
  • Compound control method of photovoltaic grid-connected inverter

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Embodiment Construction

[0031] The technical solution of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0032] Such as figure 1 As shown, the inverter main circuit includes a boost circuit, a three-level inverter circuit, and a filter circuit. The boost circuit includes a filter capacitor C b , inductance L b , switch tube T b , the first diode D b and the second diode D b0 , filter capacitor C b The two ends of the input source are respectively connected to the positive and negative poles, and the inductance L b One end is connected to the positive pole, and the other end is connected to the first diode D b The positive connection of the switching tube T b source of the first diode D b The positive pole is connected, the drain is connected to the negative pole of the input source, and the second diode D b0 The anode and switch tube T b The drain is connected, and its negative pole is connected to the switching tube T b The...

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Abstract

The invention discloses a compound control method of a photovoltaic grid-connected inverter, relating to a photovoltaic grid-connected inverter. The control method of the traditional inverter has the defects of larger harmonic distortion of the output current of the inverter and poor wave form quality. The compound control method is characterized by comprising the steps of: detecting a DC busbar voltage and a three-phase current outputted by an inverter, calculating a d shaft current reference value according to the DC busbar voltage; converting the three-phase current output by the inverter into a d shaft current measured value and a q shaft current measured value; obtaining a current difference; respectively calculating according to the current difference to obtain a PI control voltage compensating value, a resonance control voltage compensating value and a repeating control voltage compensating value by a PI control module, a resonance control module and a repeating control module; and generating a PWM (Pulse Width Modulation) wave by the PWM control module according to a composition result of the PI control voltage compensating value, a resonance control voltage compensating value and a repeating control voltage compensating value. According to the invention, specific subharmonics and periodic disturbance are inhibited, stability of the inverter is ensured, and dynamic property of the inverter is improved.

Description

technical field [0001] The invention relates to a photovoltaic grid-connected inverter. Background technique [0002] With the development of society and the advancement of technology, energy issues have become increasingly prominent. Extensive use of non-renewable energy such as coal and oil will not only fail to meet the goals of sustainable development, but will also cause huge pollution to the environment. Renewable energy represented by solar energy, wind energy, and tidal energy has become an important direction for the development of new energy in the future. Among them, solar photovoltaic power generation has been highly valued by energy experts from various countries due to its environmental protection, high efficiency, and ease of large-scale utilization. [0003] As an important part of industrialization development, photovoltaic grid-connected power generation system has developed rapidly. As the interface between the power generation system and the mains netw...

Claims

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Application Information

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IPC IPC(8): H02M7/5387H02M1/12H02J3/38
CPCY02E10/563H02M7/487Y02E10/56
Inventor 卞松江张国月
Owner WOLONG ELECTRIC GRP CO LTD
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