Power System Inertia Estimation Based on Subspace Method Under Transient Frequency Disturbance

doi:10.12204/j.issn.1000-7229.2021.02.001

Abstract

Abstract:

In order to solve the problem that traditional inertia estimation method under transient frequency disturbance is sensitive to the judgment of disturbance occurrence and inertial response duration, which leads to large estimation error, this paper proposes the idea of grid inertia estimation based on subspace method. By analyzing impulse response characteristics of the grid frequency response model at stages before transient frequency disturbance, inertial response and primary frequency-regulation response, the unified expression of grid inertia at each stage is obtained, and the grid frequency response model at all stages are taken as a system to be estimated. Subspace method is used to identify the parameters of the system model, and finally grid inertia is estimated. The effectiveness and accuracy of this method are verified by simulation.

Key words: transient disturbance, power system inertia estimation, impulse response, subspace method

CLC Number:

TM74

LI Haoran, XIA Zhixiong, LI Shichun. Power System Inertia Estimation Based on Subspace Method Under Transient Frequency Disturbance[J]. ELECTRIC POWER CONSTRUCTION, 2021, 42(2): 2-7.

Figures/Tables 8

Fig.1 Power system frequency-regulation process

Fig.2 The influence of disturbance occurrence estimation and primary frequency-regulation on inertia estimation error

Fig.3 Test system

Fig.4 Active power-frequency data at G1

Table 1 Estimation of inertia of generators during transient disturbance (10~50 s)

Fig.5 Inertia estimation errors of G1-G5 with the change of initial identification moment

Fig.6 Inertia estimation errors of G6-G10 with the change of initial identification moment

Table A1 Correspondence between algorithms and weighting matrices

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