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A system and method for locating oscillation sources of wind power grid-connected systems based on energy spectrum

An energy spectrum and positioning method technology, applied in the field of wind power grid-connected system oscillation source positioning system, can solve problems such as difficult to distinguish oscillation source units, inability to accurately locate system oscillation sources, and multi-oscillation mode coupling of wind power grid-connected systems are not considered , to achieve the effect of ensuring safe and stable operation, accurate identification, restraining development and divergence

Active Publication Date: 2020-06-16
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing research on the location of oscillation sources is mainly aimed at the traditional power system, and the influence of multi-oscillation mode coupling caused by the disturbance of the wind power grid-connected system with virtual inertia is not considered, and it is difficult to distinguish the dominant oscillation mode from the non-dominant oscillation mode. Oscillation source unit, unable to accurately locate the system oscillation source

Method used

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  • A system and method for locating oscillation sources of wind power grid-connected systems based on energy spectrum
  • A system and method for locating oscillation sources of wind power grid-connected systems based on energy spectrum
  • A system and method for locating oscillation sources of wind power grid-connected systems based on energy spectrum

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Embodiment 1

[0121] Based on the aforementioned theoretical analysis, the method for locating the oscillation source of the wind power grid-connected system based on the energy spectrum in this embodiment is as follows: figure 1 As shown, it specifically includes the following steps:

[0122] Step 1: Collect the voltage U and current I of the output ports of each unit in the system G The information is substituted into formula (2) in order to obtain the dynamic energy curve of each generating set with time.

[0123] Step 2: Divide the generating units corresponding to the curve showing an upward trend in the dynamic energy versus time curve as candidate units, that is, divide the negative damping units into candidate units.

[0124] Step 3: Obtain the energy spectrum of the synchronous unit, the double-fed wind turbine with phase-locked loop and / or the quasi-energy spectrum of the double-fed wind turbine with virtual inertia among the candidate units.

[0125] The dynamic energy of each ...

Embodiment 2

[0137] This embodiment provides a wind power grid-connected system oscillation source positioning system based on energy spectrum, including a data acquisition module, a dynamic energy calculation module, an energy spectrum analysis module and a result output module;

[0138] The data acquisition module is used to collect the voltage and current information of each unit output port of the system, and transmit it to the dynamic energy calculation module;

[0139] The dynamic energy calculation module receives the data transmitted by the data acquisition module, calculates the dynamic energy trend of each generating set over time, and transmits it to the energy spectrum analysis module;

[0140] The energy spectrum analysis module receives the dynamic energy data of the output ports of each unit, performs energy spectrum calculation, and locates the system oscillation source by comparing the similarity of the energy spectrum between each unit and the reference oscillation source ...

Embodiment 3

[0152] In this embodiment, the parallel equivalent model of double-fed wind turbines is used to simulate the entire wind farm, and the positioning method of Embodiment 1 is further verified, as shown in image 3 As shown in the system diagram of 10 machines and 39 nodes in New England, the wind farm is composed of 1,000 identical doubly-fed asynchronous wind turbines connected in parallel. Rated output operation; the wind farm first passes through a 0.69 / 20kV on-site transformer, and then connects to busbar 5 through a 20 / 230kV transformer for power transmission, and the rest of the generators are synchronous generators.

[0153] The setting scenario of this embodiment is: at t=2s, a periodic small disturbance with a frequency of 0.48 Hz is set in the mechanical torque of the fan to cause system oscillation, and the active power of the fan will oscillate with an approximate amplitude of 43 kW.

[0154] Running the dynamic energy calculation module, the result is:

[0155] Mea...

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Abstract

The invention relates to a system and method for locating an oscillation source of a wind power grid-connected system based on an energy spectrum, belonging to the technical field of wind power generation systems, and solving the problem of difficulty in accurately locating an oscillation source unit under the condition that multiple oscillation modes are excited after the system is disturbed. the problem. The method includes the following steps: collecting the voltage and current information of the output ports of each generating set in the system, and obtaining the dynamic energy changing curve of each generating set with time; taking the generating set corresponding to the curve showing an upward trend as an alternative generating set; acquiring and processing the alternative generating set Among the units, the energy spectrum of the synchronous unit, the doubly-fed wind turbine with phase-locked loop, and / or the quasi-energy spectrum of the doubly-fed wind turbine with virtual inertia, take the unit with the largest dominant oscillation mode as the oscillation source reference unit; The energy spectrum similarity coefficient of the alternative unit and the oscillation source reference unit is used to determine the oscillation source unit. The invention realizes the accurate positioning of the oscillation source unit under the condition that multiple oscillation modes are excited after the system is disturbed.

Description

technical field [0001] The invention relates to the technical field of wind power generation systems, in particular to a system and method for locating oscillation sources of a wind power grid-connected system based on energy spectrum. Background technique [0002] As an additional control link of the doubly-fed wind turbine, the virtual inertia can improve the inertia and frequency response characteristics of the system to a certain extent, but it also opens the channel for the doubly-fed wind turbine to communicate with the system power under disturbance, and strengthens the communication between the machine and the network. Coupling effect: the virtual inertia will reduce the damping level of the wind power grid-connected system, and induce the oscillation mode in which the doubly-fed wind turbine participates to present weak damping, and the system is prone to oscillation divergence and instability after being disturbed. On the other hand, in the process of system oscill...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F03D17/00H02J3/38
CPCF03D17/00Y02E10/76H02J3/381H02J2300/28H02J3/0012H02J3/24G01R31/086H03L7/099H03L7/18
Inventor 马静赵冬顾元沛沈雅琦
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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