基于VSG的并网逆变器功率控制研究

doi:10.16180/j.cnki.issn1007-7820.2020.10.002

Abstract

Abstract:

The virtual synchronous generators enable grid-connected inverters to participate in the operation of power grid autonomously and provide support for the stability of the grid. In order to verify the control function of virtual synchronous generators and solve the shortcoming of large convergent disturbance of electromagnetic power, the mathematical model and control strategy of virtual synchronous generators are analyzed. An optimized virtual synchronous generator control strategy is proposed based on the method of synchronous rotation coordinate. Finally, a 15 kVA virtual synchronous generator simulation system is established and verified by the experiment of the processor in the loop. The experimental results demonstrate that the presented control strategy can not only perform good dynamic response features on power tracking and modulation of frequency and voltage, but also provide inertia and damping for the system. Moreover, the convergence disturbance of electromagnetic power is reduced, and the stability and flexibility of the system are significantly improved.

Key words: grid-connected inverter, virtual synchronous generator, power control, active frequency modulation, reactive voltage regulation, PIL

CLC Number:

TM761

LIU Zhenxuan,YI Yingping,SHI Wei. Research on the Power Control of Grid-connected Inverter Based on VSG[J].Electronic Science and Technology, 2020, 33(10): 6-14.

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参数	数值	参数	数值
L/mH	2	ω₀/rad·s^-1	2π
R/Ω	0.5	D	25
E₀/V	311	J/kg·m²	0.5
U_set/V	311	k_q	0.2
U_ref/V	311	k_u	300
f₀/Hz	50	k_f	30

Research on the Power Control of Grid-connected Inverter Based on VSG

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