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

摘要/Abstract

摘要：

虚拟同步发电机控制技术能够让并网逆变器自主稳定地参与电网运行。为验证虚拟同步发电机控制的作用并解决电磁功率收敛扰动较大的问题,文中分析了虚拟同步发电机的数学模型和控制策略,并基于同步旋转坐标的方法,提出一种优化的虚拟同步发电机控制。搭建 15 kVA的虚拟同步发电机仿真系统,并通过处理器在环实验验证。结果表明,所设计的控制策略不仅具有较好的功率跟踪和调频调压性能,还能为系统提供惯性和阻尼。同时,新的控制策略减少了电磁功率收敛扰动,提高了系统的稳定性和灵活性。

关键词: 并网逆变器, 虚拟同步发电机, 功率控制, 有功调频, 无功调压, 处理器在环

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

中图分类号:

TM761

刘振烜,易映萍,石伟. 基于VSG的并网逆变器功率控制研究[J]. 电子科技, 2020, 33(10): 6-14.

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