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A broadband disturbance stability analysis method for regional power grid based on ergodic impedance

A technology of regional power grid and stability analysis, applied in the direction of reducing/preventing power oscillation, etc., can solve the problems of large amount of calculation, difficult operation condition simulation, complex modeling of power electronic system, etc., to achieve the effect of ensuring safe and stable operation

Active Publication Date: 2022-07-22
BEIJING SIFANG JIBAO AUTOMATION +1
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Problems solved by technology

At present, the modeling of power electronic systems necessary for time domain simulation is very complicated, and the calculation load is large, the simulation time is long, and it is not easy to conduct a comprehensive simulation of all possible operating conditions of the system

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  • A broadband disturbance stability analysis method for regional power grid based on ergodic impedance
  • A broadband disturbance stability analysis method for regional power grid based on ergodic impedance
  • A broadband disturbance stability analysis method for regional power grid based on ergodic impedance

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Embodiment Construction

[0075] The specific implementation of the technical solution of the present invention will be further described in detail below with reference to the accompanying drawings.

[0076] The flow of a regional power grid broadband disturbance stability analysis method based on ergodic impedance is as follows: figure 1 As shown, the specific implementation process is described below by taking the algorithm implementation in the subsynchronous oscillation monitoring and protection device as an example, and the algorithm implementation includes the following steps:

[0077] Step 1: at sampling frequency f samp Collect the three-phase voltage u of all lines connected to the AC bus of the new energy collection station ai , u bi , u ci and the three-phase phase current i ai , i bi , i ci , the direction of the outgoing AC bus is specified as the positive direction, and the corresponding sampling data sequences are u ai (k), u bi (k), u ci (k) and i ai (k), i bi (k), i ci (k),...

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Abstract

A method for analyzing broadband disturbance stability factors of regional power grid based on ergodic impedance. The method detects the three-phase voltage and three-phase current signals of the AC bus access line of the substation and calculates the oscillating power and impedance at the oscillating frequency point to give The stability criterion is obtained. Combined with the characteristic data of the system operating conditions at the time of oscillation, a set of oscillation-related factors for stability judgment is established, and the set of important and unimportant factors affecting the system oscillation is obtained by analysis. This method can analyze the related factors before and after the system oscillation according to the disturbance data that exists in the power system all the time, so as to obtain the main factors that affect the sub- / super-synchronous oscillation generated by the grid connection of the new energy station, which is suitable for large-scale wind turbine generators. Effective prevention and control of sub-synchronous / super-synchronous oscillation occurs when the grid is connected.

Description

technical field [0001] The invention belongs to the field of power system stability analysis, in particular to a broadband multi-oscillation mode ergodic impedance stability analysis method suitable for a large-scale new energy grid-connected power system. Background technique [0002] The safe and reliable operation of the power system is crucial to ensuring social and economic development and social stability. In recent years, my country's power system is gradually undergoing tremendous changes and development, mainly including: a large number of new energy grid-connected, a large number of applications of DC transmission technology, etc., which are clearly manifested in the generation, transmission, transformation and use of the entire power system. With the trend of power electronics, the power level of power electronic converters is constantly improving, and its penetration rate on the power supply side, transmission network and load side is getting higher and higher. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/24
CPCH02J3/24
Inventor 孙小晶常富杰刘志超时伯年王莹莹赵伟华吴雪黎
Owner BEIJING SIFANG JIBAO AUTOMATION
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