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Voltage flicker evaluation and detection method for power grid access point of photovoltaic station

A technology for connecting photovoltaic power stations to the power grid, applied in the field of power systems, can solve problems such as real-time and uninterrupted monitoring of the voltage of photovoltaic power stations, and achieve the effect of improving stability

Inactive Publication Date: 2017-06-13
WIND POWER TECH CENT OF GANSU ELECTRIC POWER +2
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Problems solved by technology

[0007] At present, there is no special on-site equipment for real-time and uninterrupted monitoring of the voltage flicker of photovoltaic power plants

Method used

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  • Voltage flicker evaluation and detection method for power grid access point of photovoltaic station
  • Voltage flicker evaluation and detection method for power grid access point of photovoltaic station
  • Voltage flicker evaluation and detection method for power grid access point of photovoltaic station

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Embodiment Construction

[0049] Such as figure 1 As shown, a method for evaluating and detecting voltage flicker based on photovoltaic power station access point voltage flicker is used to evaluate and detect photovoltaic power station voltage flicker, including the following steps:

[0050] Step 1. Collect environmental data and establish a comprehensive environmental factor model for voltage flicker at access points of large-scale photovoltaic power plants.

[0051]In order to maximize the use of renewable clean energy such as solar energy, the site selection of photovoltaic power plants is generally considered. This type of new energy power station is generally built in a relatively open area with abundant solar energy, which reduces the impact of many environmental factors on the efficiency of photovoltaic power generation. It is for this reason that the overall environment of photovoltaic power plants is relatively simple. In the overall environmental model, there are only battery panels and env...

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Abstract

The invention discloses a voltage flicker evaluation and detection method for a power grid access point of a photovoltaic station. The voltage flicker evaluation and detection method comprises the steps of collecting environment data, and establishing a voltage flicker comprehensive environment factor model of an access point of a large-scale photovoltaic station; performing modeling on the photovoltaic station based on PSCAD; establishing a power grid side model; and establishing a voltage flicker evaluation and detection model. By adoption of the voltage flicker evaluation and detection method, the voltage flicker, caused by sudden drop of solar assembly efficiency due to the factors of shadow, fragments, battery board aging and short circuit, disconnecting, mist shielding and the like of a large-scale photovoltaic base, of the power grid access point of the station can be evaluated and detected, so that safe and economical operation, and overhaul and maintenance of a photovoltaic power generation system can be facilitated; and in addition, a photovoltaic output prediction result can assist power grid dispatching to operate a control strategy, so that the stability of the photovoltaic power generation power grid can be improved.

Description

technical field [0001] The invention relates to the technical field of electric power systems, in particular to an evaluation and detection of voltage flicker at a point where a photovoltaic power station is connected to a power grid. Background technique [0002] The installed capacity of new energy (also known as clean energy) represented by solar energy has grown explosively and has become an important part of the country's power supply. As of the end of 2013, the cumulative domestic photovoltaic installed capacity reached 18 million kilowatts, and by 2020, the installed capacity of photovoltaic power generation will exceed 100 million kilowatts. [0003] The solar photovoltaic power generation system is composed of a series of solar modules connected in parallel. During operation, due to shadows, debris, aging short circuit of panels, open circuit, cloud cover or other factors, the efficiency of solar modules will suddenly drop, and the efficiency drop or damage of a si...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02S50/00G06F17/50
CPCG06F30/367H02J3/383H02S50/00H02J2203/20Y02B10/10Y02E10/56
Inventor 汪宁渤马明张健美周强马彦宏刘光途赵龙王明松吕清泉王定美陈钊张艳丽
Owner WIND POWER TECH CENT OF GANSU ELECTRIC POWER
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