Influence of Additional Frequency Control of DFIG on Frequency-Regulation Dynamic Characteristics of Power System

doi:10.12204/j.issn.1000-7229.2021.10.010

Abstract

Abstract:

In response to the fact that additional frequency control of doubly-fed induction generator (DFIG) in wind farms can have an impact on the frequency-regulation dynamic characteristics of power system. By developing the mathematical model of the coupling characteristics of multi-physical control links of DFIG, and the mathematical model of the dynamic characteristics of load-frequency control of interconnected power system considering DFIG access, taking the frequency-support control strategy with a combination of inertial support and droop control for wind power as the object of study, the dynamic characteristics of the DFIG involving the load-frequency control of the interconnected system using frequency support and the motion-mode coupling characteristics of the physical control link are investigated using small disturbance stability analysis. The analysis results show that the additional frequency control of DFIG does not significantly affect the small-disturbance stability of the system frequency-regulation dynamics. However, the inertia support control adds one more mode to the frequency-regulation dynamic characteristics of the power system, and results in the coupling of the frequency-regulation dynamic link of load-frequency control with the multiphysics control link of DFIG on partial oscillation and non-oscillation modes. The effects of additional frequency-control parameters on the dynamic characteristics of the oscillating modes are further investigated using damping ratio and oscillation frequency, and the rationality of the theoretical analysis is verified by time-domain simulation.

Key words: doubly-fed induction generator (DFIG), frequency support, small-disturbance stability, eigenvalue analysis, frequency-regulation dynamics

CLC Number:

TM614

ZHANG Zheng, PENG Xiaotao, LI Shaolin, LIANG Kai, XU Raoqi, ZHANG Rui. Influence of Additional Frequency Control of DFIG on Frequency-Regulation Dynamic Characteristics of Power System[J]. ELECTRIC POWER CONSTRUCTION, 2021, 42(10): 89-100.

Figures/Tables 18

Fig.1 Structure diagram of a DFIG-WT

Fig.2 Additional frequency control scheme of DFIG-WT

Fig.3 Frequency-regulation scheme of interconnected power system with wind power generator

Table 1 State variables of power system frequency-regulation dynamic without additional frequency-support control

Table 2 Modal analysis results of frequency-regulation dynamic of power system without additional frequency control

Fig.4 Participation factor analysis of oscillation modes

Table 3 Participation factor analysis of non-oscillation modes

Table 4 Comparison of the dynamic coupling effect of each DFIG component on the system frequency regulation

Fig.5 System frequency response when DFIG-WT with or without additional frequency control

Fig.6 Output power of DFIG-WT with or without additional frequency control

Table 5 Mode analysis results of frequency-regulation dynamic of power system with additional frequency control

Fig.7 Participation factor analysis of λ31, λ7,8 and λ17

Fig.8 Modal damping ratio and oscillation frequency variation near critical stability

Fig.9 Affection of oscillation frequency and damping ratio of λ1-14 with kd change

Fig.10 Affection of eigenvalues of part of non-oscillation modes with kd change

Fig.11 Affection of oscillation frequency and damping ratio of λ1-14with kp change

Fig.12 Affection of eigenvalues of part of non-oscillation modes with kp change

Fig.13 Dynamic response of the output of DFIG

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