Stored energy type standard-Z source photovoltaic power generation control system and method

A photovoltaic power generation and control system technology, applied in photovoltaic power generation, optical radiation generators, photovoltaic modules, etc., can solve problems such as increasing hardware costs, control complexity, and efficiency reduction, and achieve improved power generation efficiency, increased efficiency, and stable power. Effect

Inactive Publication Date: 2011-09-14
BEIJING JIAOTONG UNIV
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Problems solved by technology

However, existing solutions are based on traditional single-stage or two-stage power converters, which have their own shortcomings; in order to effectively manage the charging and discharging of energy storage batteries, an additional bidirectional DC / DC converter is introduced, which increases hardware costs and control costs. complexity, efficiency will decrease

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  • Stored energy type standard-Z source photovoltaic power generation control system and method
  • Stored energy type standard-Z source photovoltaic power generation control system and method
  • Stored energy type standard-Z source photovoltaic power generation control system and method

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Embodiment Construction

[0040] In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0041] Embodiment of Energy Storage Type Quasi-Z Source Photovoltaic Power Generation Control System

[0042] Such as figure 1 Shown is the energy storage type quasi-Z source photovoltaic power generation control system of the present invention. Among them, the energy storage type quasi-Z source inverter includes: energy storage battery, 3-phase inverter, diode D, electrolytic capacitor C 1 、C 2 , inductance L 1 and L 2 , the output filter inductance L f and capacitance C f , photovoltaic cell, grid and local load; the connection method is: capacitor C 2 Negative pole and inductance L 1 Connected, its positive pole is connected to the positive pole of the 3-phase inverter; the cathode of the diode D is connected to the cap...

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Abstract

The invention discloses a stored energy type standard-Z source photovoltaic power generation control system and method. The control system comprises a controller and a stored energy type standard-Z source inverter, wherein the controller comprises a capacitor voltage outer ring and a stored energy battery current inner ring and is used for regulating the direct-connection duty ratio of the inverter, thus the voltage of a DC (direct-current) bus can be constant, although the photovoltaic cell voltage is changed in a wide range; and the output power of the inverter is controlled by a power ring, and the output power of photovoltaic cells and the inverter is controlled so as to carry out charge-discharge management on stored energy batteries, thus realizing maximum power tracking. According to the invention, single-stage power transform is used to complete boosting, reduction voltage, inversion and energy storage, so that a simpler structure is used to realize minimum inverter capacity, thus ensuring the voltage of the DC bus to be constant and a power grid to obtain stable power, thereby maximally collecting solar energy and improving generating efficiency.

Description

technical field [0001] The invention relates to the technical field of photovoltaic power generation, in particular to an energy storage type quasi-Z source photovoltaic power generation control system and control method. Background technique [0002] Photovoltaic power generation is one of the promising new energy power generation, mainly including independent power generation system and grid-connected power generation system. Grid-connected photovoltaic power generation is the mainstream trend of development today. The power converter plays an important role in photovoltaic power generation. It is a bridge connecting photovoltaic cells with the grid (or users) and effectively transferring energy. Its reliability, efficiency and cost are crucial to the entire photovoltaic power generation system. [0003] The topology of power converters used in photovoltaic power generation systems has the characteristics of two-stage or single-stage, with or without transformers. The sin...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02N6/00H02J3/38H02J3/28H02S40/30H02S40/32
CPCY02E70/30Y02E10/563Y02E10/566Y02E10/56
Inventor 葛宝明孙东森
Owner BEIJING JIAOTONG UNIV
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