A large-scale new energy base power grid subsynchronous oscillation control method

A technology of sub-synchronous oscillation and control method, applied in the direction of reducing/preventing power oscillation, etc., to achieve the effect of improving the degree of automation and efficiency, and saving manpower

Active Publication Date: 2020-05-15
NARI TECH CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the subsynchronous oscillation phenomenon existing in existing large-scale new energy bases, and to provide a subsynchronous oscillation control method based on the oscillation contribution degree of new energy stations

Method used

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  • A large-scale new energy base power grid subsynchronous oscillation control method
  • A large-scale new energy base power grid subsynchronous oscillation control method
  • A large-scale new energy base power grid subsynchronous oscillation control method

Examples

Experimental program
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Embodiment 1

[0022] Such as figure 2 As shown, it is assumed that a new energy base substation has n circuits on the high-voltage side to the main grid, and m circuits on the low-voltage side to the new energy station. There are k main transformers in this station.

[0023] The implementation process of this embodiment is as follows figure 1 As shown, first monitor the three-phase current and voltage of all lines and main transformers on the high and low voltage side of the substation or new energy station in real time, and calculate the real-time power of each line; and perform FFT analysis on the real-time power to obtain the power in each frequency band subsynchronous component.

[0024] Next, judge whether there is a power sub-synchronous component in a certain line or a certain main transformer electrical quantity on the high-voltage side, and if it meets the following conditions, proceed to the following steps, otherwise exit:

[0025] (a) The magnitude of the power subsynchronous...

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Abstract

The invention discloses a large-scale new energy base power grid subsynchronous oscillation control method and belongs to the field of power system automation. The method is characterized by, to begin with, collecting three-phase current and voltage of all lines at the high and low voltage sides of a substation or a new energy station, carrying out signal processing on each line and monitoring subsynchronous oscillation power phasor of each line; according to subsynchronous oscillation power characteristics of the high-voltage side line, determining whether to take a control measure, and calculating the sum of subsynchronous oscillation power phasors of all lines at the high-voltage side; and comparing contribution degree of each line at the low-voltage side to the high-voltage side subsynchronous oscillation amplitude, and determining whether to cut off the low-voltage side line, and if so, cut off the low-voltage side line according to the contribution degree. The method can make a decision only based on local information of the single substation or the new energy station, can realize subsynchronous oscillation monitoring in specific areas, can also realize hierarchical control of the whole grid based on wide-area information networking, and can realize flexible implementation according to practical engineering.

Description

technical field [0001] The invention belongs to the technical field of electric power system automation, and more precisely, the invention relates to a subsynchronous oscillation control method of a large-scale new energy base power grid. Background technique [0002] Under the guidance of "two substitutions", my country's new energy development has developed rapidly in recent years. The installed capacity of new energy systems in the State Grid Corporation of China has exceeded 100 million kilowatts, and the grid-connected capacity of wind power and photovoltaics has leapt to the top of the world. The "North" region has great potential for development and utilization, and many large-scale new energy bases have been formed. It is worth noting that my country's new energy power generation needs to be transmitted to the load centers in the central and eastern regions through ultra-high voltage and long-distance transmission. Subsynchronous oscillations may occur under the influ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/24
CPCH02J3/24
Inventor 徐海波罗剑波颜云松李祝昆熊峰徐捷王计林刘东阳
Owner NARI TECH CO LTD
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