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Compound control method of photovoltaic grid-connected inverter

A composite control and composite controller technology, applied in photovoltaic power generation, single grid parallel feeding arrangement, AC network to reduce harmonics/ripples, etc. Grid current control effect, eliminate steady-state error, and control the effect of harmonic component disturbance

Inactive Publication Date: 2013-03-27
SHENZHEN GOLDEN HIGHWAY TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Embodiments of the present invention provide a composite control method for photovoltaic grid-connected inverters to solve the problem of poor grid-connected current control effect in the prior art

Method used

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

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Embodiment 1

[0015] The compound control method of the photovoltaic grid-connected inverter provided by the embodiment of the present invention is based on the voltage-oriented vector control, and is an improvement on the basis of the existing voltage-oriented vector control method. The method of the embodiment of the present invention adopts direct current control and is oriented by the grid voltage vector, and realizes the control of active power and reactive power of the grid-connected inverter by controlling the amplitude and phase of the output current of the inverter. The principle structure of the voltage-oriented vector control system is as follows: figure 1 shown.

[0016] The method of this embodiment first performs 3s / 2r coordinate transformation on the input current from the photovoltaic grid-connected power generation device, and establishes a grid-connected inverter model in the d-q coordinate system. After the coordinate transformation, in the d-q coordinate system, the thr...

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Abstract

The invention discloses a compound control method of a photovoltaic grid-connected inverter. The compound control method comprises the steps of performing 3s / 2r transformation on input current and establishing a grid-connected inverter model under a d-q coordinate system; and utilizing a compound controller to control output current to eliminate even harmonic component disturbance in the output current, wherein the compound controller comprises a proportional plus integral (PI) controller and a repetitive controller which are connected in parallel. By means of the technical scheme that the 3s / 2r transformation is performed on the input current, and the compound controller composed of the PI controller and the repetitive controller which are connected in parallel is utilized to eliminate the even harmonic component disturbance in the output current, dynamic response of a system is increased, accuracy and stability are high, harmonic component disturbance can be controlled well, steady-state errors can be eliminated, and the grid-connected current control effect is good.

Description

technical field [0001] The invention relates to the technical field of photovoltaic grid-connected inverters, in particular to a composite control method for photovoltaic grid-connected inverters. Background technique [0002] The control of the grid-connected inverter is the key to the entire photovoltaic grid-connected control. The single-stage photovoltaic grid-connected inverter needs to complete the current conversion, grid-connected control and maximum power point tracking at the same time. [0003] For grid-connected inverters, the typical control strategy is to control the active power and reactive power by controlling the output current vector. In single-stage photovoltaic grid-connected inverters, voltage-oriented vector control is the basic method. When the grid-connected inverter output current is controlled to be in phase with the grid voltage, the unit power factor operation of the grid-connected inverter can be realized; when the grid-connected inverter outpu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02J3/01
CPCY02E10/563Y02E10/56Y02E40/40
Inventor 翦志强司徒琴张灿烂
Owner SHENZHEN GOLDEN HIGHWAY TECH CO LTD
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