Power Difference Feed-forward Oscillation Suppression Method for New Power System Based on Virtual Inertial Control

doi:10.11930/j.issn.1004-9649.202312027

Abstract

Abstract:

To solve the problem of low inertia and weak damping in the new power system, virtual synchronous generator technology has attracted much attention. However, while the virtual synchronous generator provides inertia and damping for the system, it also causes the system to generate active oscillation when affected by disturbance, and it is easy to produce steady-state errors. Therefore, this paper proposes a power difference feedforward oscillation suppression method for a new power system based on virtual inertial control to optimize the control of a virtual synchronous generator. This effectively reduces the influence of active power and frequency generated under disturbance and improves the dynamic stability of the system. Meanwhile, the active closed-loop small-signal models of conventional control, differential feedforward control, and power difference feedforward control are built respectively, and the relevant parameter design methods are given. The effectiveness and superiority of the proposed strategy in solving dynamic oscillation and steady-state error problems are verified through simulation.

Key words: new power system, active oscillation, frequency overshoot, root locus analysis, parameter tuning

Xue WANG, Lin LIU, Qingdong ZHUO, Haipeng ZHANG, Ling YANG, Fangyuan XU, Yuchen CAO. Power Difference Feed-forward Oscillation Suppression Method for New Power System Based on Virtual Inertial Control[J]. Electric Power, 2024, 57(4): 68-76.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.202312027

https://www.electricpower.com.cn/EN/Y2024/V57/I4/68

Figures/Tables 10

Fig.1 Typical control structure of VSG

Fig.2 Active power closed-loop control block of VSG

Fig.3 Pole-zero distribution of active power closed-loop small-signal model for VSG with different Jp when Dp changes

Table 1 Simulation experiment parameters

参数	取值	参数	取值
U_dc/V	800	P_load/kW	50
E₀/V	311	f₀/Hz	50
R_f/Ω	0.05	J_p/(kg·m²)	5
L_f/mH	4	D_p/(N·m)	0
C_f/μF	10	J_q	0.05
R_g/Ω	0.05	k_f/(rad·W^–1)	30
L_g/mH	1.2	T/s	0.01
P_ref/kW	100	k_t	0.08
Q_ref/(kV·A)	10	k_d	0.08

Fig.4 Active power closed-loop control block of improved VSG

Fig.5 Pole-zero distribution of active power closed-loop small-signal model of NDFC with variable kd

Fig.6 Pole-zero distribution of active power closed-loop small-signal model with variable PDFC parameters

Fig.7 Comparative simulation results of test condition 1

Fig.8 Comparative simulation results of test condition 2

Table 2 Main response indicators of VSG in different control strategies

控制策略	有功设定值阶跃			电网频率跌落
控制策略	有功超调量/%	频率最大值/Hz	调节时间/ s	有功超调量/%	稳态误差值/kW	频率最低点/Hz	调节时间/ s
C-VSG (D_p=0)	23.5	50.75	2.4	2.90		49.928	1.60
C-VSG (D_p=30)	9.0	50.54	1.3	0.94	3	49.945	0.70
NDFC	6.5	50.52	1.2	0.97		49.945	0.55
PDFC		50.19	0.4	0.97		49.947	0.35

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