Harmonic suppression strategy based on cross-branch enhanced VSG control

doi:10.11930/j.issn.1004-9649.202505013

Abstract

Abstract:

The multi-node distribution station area after a large number of new energy power generation equipment is connected faces the practical problem of poor current and power quality. At the same time, the deployment of grid-connected converters dominated by virtual synchronous generator (VSG) ignores the problem of current and power quality. Therefore, in order to maintain the VSG characteristics and increase the current harmonic suppression ability, this paper proposes an enhanced VSG control strategy. Firstly, the interaction mechanism of electrical angle and voltage between AC grid and VSG in multi-VSG joint operation is analyzed. Secondly, the VSG control with cross feedback branch is proposed. This method proposes a frequency-reactive power branch and a voltage-active power branch to compensate for fluctuations without affecting the inertial characteristics of the system. Finally, the IEEE-69 network simulation distribution station area is built, and 6 VSGs are set up. The experimental results show that the enhanced VSG can provide inertial and damping support for the system. The quantitative results show that compared with the traditional VSG, the total harmonic distortion of the current is reduced by 64.2%~83.8%, which can effectively suppress the influence of the harmonics generated by the traditional VSG on the distribution network.

Key words: virtual synchronous generator, harmonic suppression, multi-node grid

XU Tao, LI Hugang, YANG Longyu. Harmonic suppression strategy based on cross-branch enhanced VSG control[J]. Electric Power, 2026, 59(4): 70-78.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.202505013

https://www.electricpower.com.cn/EN/Y2026/V59/I4/70

Figures/Tables 11

Fig.1 Topology modeling of VSG systems connected to the AC grid

Fig.2 Mechanism of voltage-frequency interaction

Fig.3 Enhanced VSG Control

Fig.4 IEEE-69 node network with VSGs

Table 1 Line impedance values corresponding to each VSG

VSG	电缆敷设距离/km	R_g	X_g
VSG1	1.4064	0.731328	0.172987
VSG2	1.8583	0.966316	0.228571
VSG3	0.4628	0.240656	0.056924
VSG4	1.9560	1.017120	0.240588
VSG5	0.5541	0.288132	0.068154
VSG6	1.5305	0.795860	0.188252

Table 2 Power dispatch instruction 单位：kW

VSG	P_ref阶跃前	P_ref阶跃后
VSG1	6	15
VSG2	6	15
VSG3	6	15
VSG4	2	8
VSG5	2	8
VSG6	2	8

Fig.5 Traditional VSG strategy waveform

Fig.6 Improved strategy waveform

Fig.7 Active power ripple ratio comparison

Fig.8 Grid-forming voltage waveform

Fig.9 Total harmonic distortion of inverter output current

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