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Power grid voltage phase lock method for zero voltage ride through of photovoltaic grid-connected inverter

A technology of zero voltage ride-through and grid voltage, applied in the direction of AC network voltage adjustment, single grid parallel feeding arrangement, reactive power compensation, etc.

Active Publication Date: 2014-05-28
ZHEJIANG EIFESUN ENERGY TECH
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Problems solved by technology

The disadvantages of this traditional phase-locking method are: 1) When the grid voltage drops unbalancedly, the voltage signals in the two-phase coordinate system are no longer orthogonal, and the direct calculation of the phase will make the current control unbalanced; 2) In the When the grid voltage drops to zero, the phase cannot be calculated or the phase can be obtained through the closed-loop phase-locked loop

Method used

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  • Power grid voltage phase lock method for zero voltage ride through of photovoltaic grid-connected inverter
  • Power grid voltage phase lock method for zero voltage ride through of photovoltaic grid-connected inverter
  • Power grid voltage phase lock method for zero voltage ride through of photovoltaic grid-connected inverter

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Embodiment Construction

[0029] The adaptive phase locking method used in the present invention is as image 3 shown. The input signal e in the figure α ,e β It is the voltage signal under the two-phase static coordinates, which is the three-phase grid voltage e a ,e b ,e c It is transformed from the three-phase stationary coordinate system to the two-phase stationary coordinate system.

[0030] image 3 The first step in the two-phase static coordinates of the voltage signal e α ,e β Perform bandpass filtering. The transfer function expression of the output of the two closed-loop bandpass filters for the input is:

[0031] e α 1 e α = e β 2 e β = αws s 2 ...

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Abstract

The invention discloses a power grid voltage phase lock method for zero voltage ride through of a photovoltaic grid-connected inverter, and discloses a zero voltage ride through control method for the photovoltaic grid-connected inverter. The method comprises a power grid voltage phase lock method, an active current control method and a reactive current control method in a zero voltage ride through process of the photovoltaic grid-connected inverter. The phase lock method is used for supplying a phase to current control in the zero voltage ride through process. According to the power grid voltage phase lock method disclosed by the invention, the inverter can perform automatic amplitude limitation on active current conveyed to a power grid in a power grid voltage falling process and also quickly recover the amplitude after the power grid voltage is recovered; meanwhile, the inverter has the capability of sending reactive current to the power grid according to the reduction degree of the amplitude of the power grid voltage.

Description

technical field [0001] The invention belongs to the technical field of three-phase grid-connected inverter control. Background technique [0002] When a power system accident or disturbance causes a large drop in the grid voltage, the sudden disconnection of the photovoltaic power station will further deteriorate the operating status of the entire grid. power failure. For this reason, people put forward the requirement that the photovoltaic power station must have the function of zero voltage ride through, which means that when the grid voltage drops or even drops to zero directly due to a short circuit in the system, the photovoltaic power generation system can still ensure continuous operation without going out of the grid, and provide certain Reactive power is used to support the recovery of the fault grid to normal levels, thus crossing the zero voltage region. [0003] With the continuous increase of the capacity of photovoltaic power plants, zero voltage ride through...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02J3/16
CPCY02E40/30
Inventor 李赟张晓忠刘红
Owner ZHEJIANG EIFESUN ENERGY TECH
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