Dynamic characteristics of flywheel energy storage virtual synchronous machine and analysis of power system frequency improvement

doi:10.19799/j.cnki.2095-4239.2023.0059

Abstract

Abstract:

After the "double carbon" target is put forward, renewable energy power generation continues to increase, the proportion of traditional thermal power units decreases, the inertia of the power system decreases, and frequency security faces challenges. The flywheel energy storage virtual synchronous generator (VSG) has the ability to provide fast response and inertia support to improve the frequency characteristics of the power system. This study first establishes a VSG model of flywheel energy storage, and the dynamic response characteristics under different damping states are analyzed. Similarly, flywheel energy storage VSG's inertia and fast response advantages were verified, and the optimal control parameters of the 2.5 MW/0.5 MWh flywheel energy storage array VSG were determined. Furthermore, a frequency response expansion model of a power system with flywheel energy storage VSG is established. The inertia response and frequency modulation ability of flywheel energy storage VSG are expounded. Additionally, the simulation analysis of a regional power system in the Matlab/Simulink environment is performed to verify that the frequency modulation auxiliary and inertia support functions of flywheel energy storage VSG can suppress the frequency drop of the power system during power disturbance, raise the lowest frequency point, and improve the frequency deterioration of the power system.

Key words: flywheel energy storage, virtual synchronous machine(VSG), inertia, frequency characteristics

CLC Number:

TM 743

Xinglong ZUO, Yibing LIU, Run QIN, Wenhao QU, Wei TENG. Dynamic characteristics of flywheel energy storage virtual synchronous machine and analysis of power system frequency improvement[J]. Energy Storage Science and Technology, 2023, 12(6): 1920-1927.

Figures/Tables 10

Fig.1

Fig. 2

Table 1

The parameters of flywheel energy storage VSG"

飞轮储能VSG参数	数值
额定角频率 $ω 0$ /(r/s)	314
虚拟惯性系数 $H V$ /(p.u.)	0.15( $ξ = 4$ )；0.15( $ξ = 1$ )； 0.21( $ξ = 0.707$ )
阻尼系数 $D V$ /(p.u.)	50.24( $ξ = 4$ )；12.56( $ξ = 1$ )； 12.56( $ξ = 0.707$ )
VSG整机同步功率系数 $S E$ /(p.u.)	1.03

Table 1

Fig. 3

Fig. 4

Fig. 5

Fig. 6

Table 2

The simulation parameters"

参数	$M$	$D$	$R$	$a$	$T$	$η$	$T B$	$H V$	$D V$	$k$	$β$
数值	10	1	0.05	0.3	8	0.45	0.03	0.21	12.56	1.2	0.05

Table 2

Fig. 7

Fig. 8

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