Oscillation Suppression Strategy for Droop Control Converter Based on Active Harmonic Resistance Control

doi:10.11930/j.issn.1004-9649.202502048

Abstract

Abstract:

The droop control converter exhibits capacitive characteristics in the frequency band below 50 Hz, which leads to the problem of RLC oscillation when it interacts with the inductive power grid, thus causing harm to the power grid. Based on this, this paper firstly establishes a sequence impedance model of droop control converter using the harmonic linearization method, which reveals the mechanism of oscillation after the interaction between the droop control converter and the power grid. Then, a control strategy for active harmonic resistance based on droop control converter is proposed, which only requires modifying the voltage loop command of the converter to shape the impedance characteristics (excluding the fundamental frequency) into resistive behavior, thereby avoiding oscillations when interacting with an inductive grid. To address the possible influence of active harmonic resistance on the stability of the system, an adaptive control strategy is proposed to adjust the parameter value, thus ensuring consistent suppression of system oscillation. Finally, simulation and hardware-in-the-loop (HIL) experiments validate the effectiveness of the active harmonic resistance control strategy.

Key words: droop control converter, sequence impedance modeling, stability analysis, active harmonic resistor, adaptive control

HU Xuekai, MENG Liang, LI Lei, YANG Yang, YIN Yilin, LEI Wanjun. Oscillation Suppression Strategy for Droop Control Converter Based on Active Harmonic Resistance Control[J]. Electric Power, 2025, 58(9): 44-53, 67.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.202502048

https://www.electricpower.com.cn/EN/Y2025/V58/I9/44

Figures/Tables 17

Fig.1 Block diagram of GFM inverter based on droop control

Fig.2 Positive and negative sequence impedance of GFM inverter based on droop control

Fig.3 Equivalent circuit of grid-connected GFM inverter

Fig.4 Control block diagram based on active harmonic resistance

Fig.5 System power flow relationship

Fig.6 Positive sequence impedance curve based on active harmonic resistance control

Fig.7 The influence of Rh on system stability

Fig.8 The influence of Rh on system stability based on bode

Fig.9 Adaptive control block diagram of active harmonic resistance

Fig.10 The HIL experiment platform

Table 1 Experimental parameters

参数	数值	参数	数值
直流电压V_dc/V	700	有功下垂系数m	1.2×10^–4
网侧电压U_g/V	220	无功下垂系数n	5×10^–4
基频f₁/Hz	50	G_f(s)截止频率ω_c/rad	358
开关频率f_s/kHz	20	电压环比例参数k_vp	2
滤波电感L_f/mH	1.5	电压环积分参数k_vi	2000
滤波电容C_f/μF	50	电流环比例参数k_ip	45
阻尼电阻R_c/Ω	1.5	电流环积分参数k_ii	2400
额定有功功率P/kW	20	G_L(s)截止频率ω_f/rad	62.8

Fig.11 The interaction results of converter and grid impedance

Fig.12 The HIL experiment result of grid-side current when Lg=5 mH

Fig.13 FFT analysis results of grid-connected current

Fig.14 Oscillation suppression under different working conditions

Fig.15 Verification of adaptive control strategy

Fig.16 The voltage and current waveform of point of common coupling when the impedance of grid changes

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