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Method for actively dispatching photovoltaic inverters

A technology for photovoltaic inverters and scheduling methods, applied in photovoltaic power generation, conversion of AC power input to DC power output, instruments, etc.

Active Publication Date: 2015-01-14
XJ ELECTRIC +1
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  • Abstract
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  • Claims
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Problems solved by technology

[0004] The purpose of the present invention is to provide a photovoltaic inverter active power scheduling method to solve the problem that the two-stage photovoltaic power generation system cannot realize power control by controlling the magnitude of the current

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  • Method for actively dispatching photovoltaic inverters
  • Method for actively dispatching photovoltaic inverters
  • Method for actively dispatching photovoltaic inverters

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Embodiment Construction

[0026] The present invention will be further introduced below in conjunction with the accompanying drawings and specific embodiments.

[0027] The structure of the two-stage photovoltaic power generation system is as follows: figure 2 As shown in the upper part, the front-stage BOOST circuit completes the voltage boost, and the rear-stage inverter circuit completes the inversion. The active power control of the present invention is realized through the front-stage circuit. figure 2 The lower part of the figure shows the control structure of the photovoltaic inverter active power scheduling method of the present invention. As can be seen from the figure, the method includes the following steps:

[0028] (1) Real-time sampling of the AC voltage and AC power of the photovoltaic power generation system to calculate the current active power Grid_Pac;

[0029] Grid_Pac=U an *I an + U bn *I bn + U cn *I cn

[0030] Among them, U an , U bn , U cn is the three-phase AC pha...

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Abstract

The invention discloses a method for actively dispatching photovoltaic inverters. The method includes sampling alternating-current voltages, alternating-current power and input voltages of direct-current sides of systems in real time; performing PI (proportion and integration) control on real-time output active power of the inverters and active power dispatching slope values and utilizing results as output reference voltages of cell panels; comparing the output reference voltages to actual output voltage values of the cell panels; acquiring PWM (pulse width modulation) waves by means of computation and controlling switch devices of preceding-stage booster circuits by the aid of the PWM waves; enabling actual direct-current input voltages to stably run under the conditions of the reference voltages. The method has the advantages that output voltages of the cell panels are offset from the maximum power point voltages of the cell panels under the control of power loops, output power of the photovoltaic inverters change from the current power to reach the dispatching values, and accordingly power control effects can be realized.

Description

technical field [0001] The invention belongs to the technical field of photovoltaic power generation, and in particular relates to a method for dispatching active power of a two-stage photovoltaic power generation system. Background technique [0002] With the continuous development of the photovoltaic industry, the application of string photovoltaic inverters is becoming more and more extensive. Compared with centralized photovoltaic inverters, the power station built by string inverters occupies a small It is convenient and simple, especially in distributed roofs, mountains and hills and other places; and the installation location of the battery panel is flexible, which can absorb solar energy to the maximum extent, making its power generation high. [0003] Due to the low voltage of the DC input side of the string photovoltaic inverter, the topological structure is mostly two-stage, which is composed of a BOOST boost circuit and an inverter circuit. Constant pressure ope...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/67H02M7/5387
CPCY02E10/56
Inventor 赵建荣王林张海龙黄辉孟向军曹建博肖飞
Owner XJ ELECTRIC
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