Working method of grid-connected photovoltaic power generation system

A technology of photovoltaic power generation system and working method, which is applied in the direction of photovoltaic power generation, electrical components, single-network parallel feeding arrangement, etc., and can solve the problems of inaccurate positioning of the system, high-frequency jitter, and difficult selection of sliding mode control, etc.

Inactive Publication Date: 2010-05-19
TIANJIN UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

However, the sliding mode control has the disadvantages that the ideal sliding mode switching surface is difficult to select, and the control effect is affected by the sampling frequency. It also ha

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  • Working method of grid-connected photovoltaic power generation system
  • Working method of grid-connected photovoltaic power generation system
  • Working method of grid-connected photovoltaic power generation system

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[0038] Example: A grid-connected photovoltaic power generation system (see figure 1 ), which is characterized in that it is composed of a phase-locked loop, a current transformer, a repeating controller and a PWM generator; the output of the current transformer and the phase-locked loop are respectively connected to the two inputs of the repeating controller, and the repeating controller The output of the PWM generator is connected to the PWM generator, and the output of the PWM generator is connected to the four IGBT control input terminals.

[0039] The said phase-locked loop is to obtain the grid voltage phase and send it to an input of the repeat controller. It multiplies the standard sinusoidal signal inside the controller to obtain the reference signal required for control, so that the inverter output voltage, The frequency and phase must be consistent with the grid voltage to be connected to the grid with unity power factor.

[0040] The current transformer is used to detect...

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Abstract

The invention relates to a grid-connected photovoltaic power generation system which consists of a phase-locked loop, a current transformator, a repetitive controller and a PWM generator. The invention also relates to a working method of the grid-connected photovoltaic power generation system, comprising the steps of: (1) acquiring network voltage phase position and grid-connected current; (2) designing the repetitive controller; (3) setting the modulation ratio, switch frequency and sampling times within unit cycle of an inverter; and (4) sending the output of the repetitive controller into the PWM generator, completing the switch operation for the inverter, and finally finishing grid-connected control for solar photovoltaic power generation. The invention has the advantages that the output waveform is greatly improved, the grid-connected current harmonic content is low, the total harmonic distortion is less than 1%, dc component is not contained, the power factor of the inverter is high, all indexes such as electrical energy quality and the like is in accordance with the requirement of grid-connected engineering technology, and the invention has application prospect.

Description

(1) Technical field [0001] The invention is used in the grid-connected photovoltaic power generation industry of solar energy, belongs to the interdisciplinary field of power electronics technology and control theory, and is particularly a working method of a grid-connected photovoltaic power generation system. (2) Background technology [0002] As the world's energy shortage and environmental pollution intensify, the utilization of renewable resources has attracted much attention. Solar energy has become the focus of people's utilization because of its universality, abundance and cleanliness. Today, solar energy is completing the transition from supplementary energy to alternative energy. At present, there are two main forms of solar energy utilization: thermal utilization and photovoltaic power generation utilization. Among them, photovoltaic grid-connection, which belongs to power generation utilization, is the development trend of solar energy utilization. [0003] Th...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02M7/537
CPCY02E10/563Y02E10/56
Inventor 周雪松宋代春马幼捷权博李圣明程德树田密
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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