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A Site Selection Method for Harmonic Quality Monitoring Points for Power System Photovoltaic Dedicated Lines

A quality monitoring and power system technology, applied to electrical components, circuit devices, AC network circuits, etc., can solve problems such as complex calculations, achieve simple mathematical operations, easy operation and implementation, and avoid the effects of harmonic power flow calculations

Active Publication Date: 2018-11-13
STATE GRID SHANDONG ELECTRIC POWER +2
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] At present, the site selection of harmonic quality monitoring points adopts harmonic power flow calculation, but there is a problem of complex calculation

Method used

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  • A Site Selection Method for Harmonic Quality Monitoring Points for Power System Photovoltaic Dedicated Lines
  • A Site Selection Method for Harmonic Quality Monitoring Points for Power System Photovoltaic Dedicated Lines
  • A Site Selection Method for Harmonic Quality Monitoring Points for Power System Photovoltaic Dedicated Lines

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Embodiment Construction

[0024] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0025] When the dedicated feeder for photovoltaic power supply in the power system is connected to multiple photovoltaic power supplies at different locations, each photovoltaic power supply can be equivalent to a harmonic source and inject harmonics into the feeder. For a representative equivalent simple system consisting only of PV sources and feeders, see figure 1 , the left and right ends are connected to the grid through a transformer. There are n photovoltaic power sources connected to the entire feeder line with a total length of N, and the capacities of photovoltaic power sources from left to right are S 1 , S 2 , S 3 …S n , the distance between the access point and the left end of the feeder is N 1 , N 2 , N 3 …N n .

[0026] Since the injection current of the photovoltaic power supply to the feeder is proportional to its capacity, a...

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Abstract

The invention provides a harmonic quality monitor point address selecting method for a special photovoltaic line of a power system. The method comprises the steps of calculating total harmonic distortion of each photovoltaic power access point according to a photovoltaic power capacitance parameter of the special photovoltaic line, an access position parameter and an average harmonic current parameter; and determining the position of a harmonic quality monitor point address according to the total harmonic distortion, so as to rapidly and effectively locate harmonic quality weak points in a special feeder line in a certain photovoltaic access manner. The method provided by the invention is simple and fast, prevents complex harmonic load flow calculation, and is convenient for workers without professional power system knowledge to operate and implement.

Description

technical field [0001] The invention belongs to the field of grid connection of distributed power sources, and relates to a site selection method for harmonic quality monitoring points for power system photovoltaic power supply lines. Background technique [0002] Distributed power generation has a wide range of economic and social benefits. Today, when energy is increasingly scarce, the country vigorously promotes distributed power generation, especially the use of solar energy. With the further improvement of thin-film power generation technology, photovoltaic power is no longer limited to a single individual with small capacity, but has a tendency to develop towards large-capacity centralized grid connection. It can be seen that in the near future, not only will the capacity of photovoltaic power plants increase, but they will also be widely distributed between urban and rural areas. [0003] With the continuous increase of photovoltaic grid-connected scale, the harmonic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/00
CPCH02J3/00H02J2203/20
Inventor 魏飞别朝红寇宇张成相王东阳秦鹏林刚谢海鹏主晓琨姜江枫
Owner STATE GRID SHANDONG ELECTRIC POWER
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