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Online positioning method for subsynchronous oscillation initiated by VSC access

A technology of sub-synchronous oscillation and positioning method, which is applied to the mathematical characteristics of the engine, the monitoring of wind turbines, and the reduction/prevention of power oscillation, etc., which can solve the problems of high initial data requirements, low model accuracy, and time-consuming modeling and simulation of power systems. and other problems, to achieve the effect of solving inaccurate positioning, solving inefficient problems, and accurate positioning

Active Publication Date: 2019-05-03
NORTH CHINA ELECTRIC POWER UNIV +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Aiming at the technical problems existing in the existing methods, the present invention proposes a simple and fast method for identifying the subsynchronous oscillation source in the wind farm, and quickly solves the subsynchronous oscillation phenomenon caused by the connection of the wind farm
The invention solves the problems of serious time-consuming modeling and simulation and low model accuracy, and realizes the determination of the oscillation source based on the monitoring curve of the real-time equipment without constructing a system model; solves the problem of high initial data requirements for the power system, and realizes Judging based on a small amount of data, only the output power data of each device port is needed, and the data of the entire network is not required; the problem of high hardware consumption is solved, and the fast calculation and positioning of the oscillation source is realized, and the occupied hardware resources are very low

Method used

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  • Online positioning method for subsynchronous oscillation initiated by VSC access
  • Online positioning method for subsynchronous oscillation initiated by VSC access
  • Online positioning method for subsynchronous oscillation initiated by VSC access

Examples

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Effect test

Embodiment 1

[0188] like Figure 12 Shown is a four-machine two-area power system, and two PMSG and two DFIG fans are connected. Now it is found that subsynchronous oscillation occurs in the system. According to the invention method of this patent, there is no need to build a system model, only through The monitoring data determines the source of oscillation in the system, and the solution is as follows:

[0189] 1. Determine the subsynchronous oscillation frequency

[0190] In order to locate the source of subsynchronous oscillation, it is first necessary to determine the frequency of subsynchronous oscillation occurring in the system, and design a bandpass filter based on this. Specifically, this stage is divided into two parts: 1. Denoising the monitoring data; 2. Obtaining its oscillation frequency.

[0191] 1. Obtain the field data of subsynchronous oscillation, design a low-pass filter, filter the data, and remove the harmonic components, as shown in Figure 13(a).

[0192] 2. Figu...

Embodiment 2

[0251] like Figure 40 Shown is a complex power system with 4 grid-connected wind farms, in which the AC system is a New England system with 10 machines and 39 nodes, four machines and two areas. Now it is found that subsynchronous oscillation occurs in the system. According to the patent Invented method, the solution is as follows:

[0252] 1. Determine the subsynchronous oscillation frequency

[0253] 1. Obtain the field data of subsynchronous oscillation, design a low-pass filter, filter the data, and remove the harmonic components, as shown in Figure 41.

[0254] 2. Determine the oscillation frequency. Figures 41(a) to 41(c) It is the fluctuation curve of the system frequency, and it can be observed that there are obvious subsynchronous oscillations in the waveform. In order to further determine the frequency of this synchronous oscillation, FFT is used for analysis, and the results are as follows Figure 42 shown.

[0255] Depend on Figure 42 It can be seen that t...

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Abstract

The invention belongs to the technical field of wind power and particularly relates to an online positioning method for subsynchronous oscillation initiated by VSC access. The invention proposes a parallel filter method to approximately measure and obtain a wind farm in a closed loop power system and an open loop residue of a residual AC system, and an oscillation source is determined according tothe magnitude of a judgment index (square) root Rv1Rac1. According to the method, the positioning of the oscillation source in the wind farm can be achieved, the time-consuming simulation and the disassembly of the device are avoided, the steady-state operating point of a system is not changed, and the credibility of a result is improved. The method has the advantages of small required amount ofcalculation, fast calculation result, and low resource occupation. In addition, the method achieves a high accuracy of judgment based on a small amount of data, and a wind turbine or a wind farm can be accurately positioned without performing range inspection.

Description

technical field [0001] The invention belongs to the technical field of wind power, and in particular relates to an online positioning method suitable for subsynchronous oscillation caused by VSC access. Background technique [0002] In recent years, with the vigorous development of renewable energy and the gradual advancement of the global energy Internet, VSC (voltage source converter, VSC) has many advantages such as flexible control, interconnection with weak AC grids, and no commutation failure. Photovoltaic grid-connected and flexible DC transmission have been widely used and become key equipment for building future smart grids. However, with the increase of wind farm access, the phenomenon of subsynchronous oscillation in the power system is caused, which threatens the stability of the system operation. [0003] At present, there are mainly two methods for locating subsynchronous oscillation sources in wind farms. One is the method of locating subsynchronous oscillati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/24H02J3/38
CPCH02J3/01G01R23/06G01R23/165H02J2300/28H02J3/381Y02E10/76Y02E40/40H02J3/241F03D17/00F05B2200/00G01R23/08G01R23/167F05B2260/80H02M1/126H02J3/38
Inventor 杜文娟付强王海风
Owner NORTH CHINA ELECTRIC POWER UNIV
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