High Frequency Resonance Characteristics Analysis of Voltage Controlled Virtual Synchronous Generator and Suppression Strategy

doi:10.12141/j.issn.1000-565X.220635

Abstract

Abstract:

Virtual synchronous generator (VSG) simulates the operation mechanism of synchronous generator and introduces active frequency modulation and reactive voltage regulation control link. Different from the traditional current control converter, it is a voltage control strategy. Based on control configuration and power grid and source coordination characteristics, this paper constructed small signal analysis models, analyzed the oscillation modes under variable control parameters and power system parameters. Then it obtained high frequency resonance characteristics of voltage controlled VSG and proposed suppression control strategy. Firstly, this paper established the small-signal analysis models of voltage control virtual synchronous generator and traditional flow converter control and electrical link, respectively. Through eigenvalue analysis method, the oscillation mode and damping ratio of all the eigenvalues were quantitatively analyzed, and it is found that the voltage control virtual synchronous generator has a high frequency oscillation mode similar to the traditional converter. And it analyzed the control parameter change of the virtual synchronous generator and the high frequency resonance damping mechanism of the power grid scene. Then, based on the control strategy of voltage controlled virtual synchronous generator, with the active damping method, the virtual impedance control strategy based on the current inner ring front channel was proposed to suppress the high-frequency resonance. Finally, the proposed control strategy was verified in the loop experiment results using Matlab/Simulink simulation and RT-LAB controller. The results show that the virtual impedance control link effectively plays a positive damping role. Compared with the passive damping method, in the case of no additional measuring point and external control amount, the voltage control VSG network side damping characteristics are improved, the transient response ability is enhanced, and the high frequency instability phenomenon is effectively suppressed.

Key words: virtual synchronous generator, small-signal model, eigenvalue, high frequency resonance, virtual impedance

CLC Number:

TM 614

LI Zhi, LIU Mingbo, LIU Hui, et al. High Frequency Resonance Characteristics Analysis of Voltage Controlled Virtual Synchronous Generator and Suppression Strategy[J]. Journal of South China University of Technology(Natural Science Edition), 2024, 52(2): 50-61.

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参数	数值			参数	数值
参数	变流器	VSG		参数	变流器	VSG
P_ref/kW	200	200	Q_ref/kVar		0	0
C_g/μF	600	600	L_g/μH		150	150
K_P1	0.64	0.64	K_P2		0.64	0.64
K_I1	100	100	K_I2		100	100
L_l/mH	0.026	0.026	R_l/mΩ		0.064 2	0.064 2
J/（kg·m²）		0.33	K_p，pll		10
K_Dp		9 442	K_i，pll		500

常规变流器						电压控制型VSG
特征根序号	实部	振荡频率/Hz	阻尼比	主要状态变量		特征根序号	实部	振荡频率/Hz	阻尼比	主要状态变量
1，2	-1 054.6	1 417.4	0.117 6	u_o_d，u_o_q，i_o_d，i_o_q	1，2		-1 058.6	1 409.3	0.118 7	u_o_d，u_o_q，i_o_d，i_o_q
3，4	-1 033.2	1 317.3	0.123 9	u_o_d，u_o_q，i_o_d，i_o_q	3，4		-1 041.5	1 316.4	0.124 9	u_o_d，u_o_q，i_o_d，i_o_q
5，6	-2 042.6	157.9	0.899 5	i_i_d，i_i_q	5，6		-4 100.4	0.0	1.000 0	i_i_d，i_i_q
7，8	-1 354.7	108.3	0.893 6	i_i_d，i_i_q	7		-765.4	0.0	1.000 0	ω，θ，P_e
9，10	-1 21.39	0.3	0.999 9	u_v_d，u_v_q	8，9		-331.3	5.5	0.994 6	i_l_d，i_l_q
11，12	-4.35	3.5	0.192 6	K_i，pll，θ_pll	10		-173.2	0.0	1.000 0	u_l_d，u_l_q
					11，12		-81.9	4.6	0.943 5	e_d， P_e，Q_e
					13，14		-15.7	2.7	0.680 4	ω， P_e，Q_e
					15		-162.4	0.0	1.000 0	u_l_d，u_l_q

参数	数值		数值
电网频率/Hz	50	电网电压/V	315
滤波器电容/μF	600	滤波器电感/μH	150
开关频率/kHz	3.2	直流母线电压/V	600
额定功率/kW	500	死区时间/μs	2

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