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Traversing impedance-based wideband disturbance stability analysis method of regional power grid

A technology for regional power grid and stability analysis, which is applied in the direction of reducing/preventing power oscillation, and can solve problems such as large amount of calculation, complex modeling of power electronic systems, and long simulation time.

Active Publication Date: 2019-04-12
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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  • Traversing impedance-based wideband disturbance stability analysis method of regional power grid
  • Traversing impedance-based wideband disturbance stability analysis method of regional power grid
  • Traversing impedance-based wideband disturbance stability analysis method of regional power grid

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Embodiment Construction

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

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

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

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Abstract

The invention relates to a traversing impedance-based wideband disturbance stability analysis method of a regional power grid. According to the method, a three-phase voltage and three-phase current signal of an AC bus access circuit of a substation is detected, impedance under oscillation power and oscillation frequency point is calculated, stable criterion is given out, the running condition characteristic data of an oscillation moment system is simultaneously combined, an oscillation connection factor set for the stability criterion is built, and analysis is performed to obtain an importantinfluence factor set and an unimportant influence factor set of the system oscillation. By the method, analysis can be performed on the connection factor according to disturbance data, existing at anytime, of a power system before and after oscillation occurs in the system, so that a main factor affecting sub / super-synchronous oscillation generated by grid connection of a new energy field stationis obtained, and the method is suitable for effectively preventing and controlling the sub-synchronous / super-synchronous oscillation generated by large-scale grid connection of a wind power generatorset.

Description

technical field [0001] The invention belongs to the field of power system stability analysis, and in particular relates to an ergodic impedance stability analysis method applicable to a wide-band multi-oscillation mode of 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 sources connected to the grid, a large number of applications of direct current transmission technology, etc. With the trend of power electronics, the power level of power electronic converters is constantly improving, and their penetration rates on the power supply side, transmission network and load side are getting higher and higher. [0003] The flexible controllability of power electronic convert...

Claims

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Application Information

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Patent Type & Authority Applications(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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