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A kind of control method of photovoltaic power station AVC

A photovoltaic power station and control method technology, applied in photovoltaic power generation, electrical components, circuit devices, etc., can solve problems such as unqualified voltage regulation, achieve the effect of increasing reserve capacity and smoothing rapid and irregular changes

Active Publication Date: 2020-03-20
STATE GRID CORP OF CHINA +1
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Problems solved by technology

However, this strategy fails to give full play to the rapid adjustment ability of the dynamic reactive power compensation device to stabilize the rapid and irregular changes in voltage, which may easily lead to unqualified voltage regulation.

Method used

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  • A kind of control method of photovoltaic power station AVC

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Embodiment

[0051] Embodiment: a kind of control method of photovoltaic power plant AVC (see figure 1 ), characterized in that it comprises the following steps:

[0052] (1) Obtain the voltage target value U of the grid-connected point of the photovoltaic power station issued by the dispatching system target , to obtain the measured value U of the busbar voltage at the grid-connected point of the photovoltaic power station mea And the real-time status data, operation information and electrical quantity information of the booster station of the photovoltaic inverter and reactive power compensation device;

[0053] (2) According to the formula ΔU=|U target -U mea |Calculate the voltage deviation value ΔU of the grid-connected point of the photovoltaic power station; if the voltage deviation value ΔU is within the preset voltage deviation dead zone threshold, enter step (3); otherwise, enter step (4);

[0054] (3) carry out reactive power replacement, return to step (1);

[0055] (4) Co...

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Abstract

The invention discloses a control method for a photovoltaic power station AVC. A reactive power distribution method of a photovoltaic power station can be provided according to a deviation between a target value of a grid-connected point voltage of the photovoltaic power station and a measured value of a grid-connected point busbar voltage. According to the control method disclosed by the invention, an irregular quick change of the voltage can be stabilized by fully utilizing the adjustment speedability of a dynamic reactive power compensation device; the quick adjusting capability of the SVG is reserved as much as possible when the operating requirements of a reactive voltage are met; and a dynamic reactive power is provided for emergency situations of a power grid accident and the like for later use. On the basis of distributed balance characteristics of the reactive voltage, modeling of a control unit is carried out according to a photovoltaic wire; a slow change of the voltage is compensated through coordination and cooperation of a plurality of reactive sources; and the requirements of the grid-connected point voltage are maintained.

Description

[0001] (1) Technical field: [0002] The present invention relates to the technical field of power system control technology, in particular to an AVC (Automatic Voltage Control—Automatic Voltage Control) control method for a photovoltaic power station. [0003] (two) background technology: [0004] In recent years, with the increasingly tight supply of fossil energy and the increasing concern of people on global environmental issues such as climate change, it has become the consensus of all countries in the world to promote sustainable energy development through the development of renewable energy, and photovoltaic power generation has developed rapidly. With the continuous increase of the installed capacity of photovoltaic power plants, the safe and stable operation of grid-connected photovoltaic power plants and the power grids in the areas connected to them has attracted increasing attention. One of the important aspects is that large-scale photovoltaic power generation grid-...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38H02J3/50
CPCH02J3/383H02J3/50Y02E10/56
Inventor 任巍曦刘宏勇朱跃寇建王德伟赵雷庆李洋姚城
Owner STATE GRID CORP OF CHINA