基于自适应VSG控制的光伏并网系统

doi:10.16180/j.cnki.issn1007-7820.2022.09.004

摘要/Abstract

摘要：

在传统VSG控制中,将同步发电机的转动惯量和阻尼系数引入光伏逆变器,会导致光伏并网系统动态调节能力欠佳。针对这一问题,文中提出一种改进VSG控制策略。通过变换器数学模型讨论功角与有功功率的关系和转子角频率振荡周期的暂态过程,给出转动惯量和阻尼系数的选取原则,并分析转动惯量与角频率变化率以及阻尼系数与角频率变化量之间的关系,引出自适应VSG控制下的光伏并网改进策略。仿真结果表明,基于自适应VSG控制策略的光伏并网系统动态响应良好,体现了改进策略的有效性和优越性。

关键词: 光伏微网, 虚拟同步机, 转动惯量, 阻尼系数, 自适应控制, MATLAB仿真, SVPWM, 逆变器

Abstract:

In traditional VSG control, the introduction of the inertia moment and damping coefficient of the synchronous generator into the photovoltaic inverter will result in poor dynamic adjustment capabilities of the photovoltaic grid-connected system. In view of this problem, this study proposes an improved VSG control strategy. The relationship between power angle and active power and the transient process of the rotor angular frequency oscillation period are discussed through the mathematical model of the converter. The principles for selecting moment of inertia and damping coefficient are given, and the rate of change of moment of inertia and angular frequency as well as damping coefficient and angular frequency are analyzed. The relationship between the changes leads to the improvement strategy of photovoltaic grid-connected under the control of adaptive VSG. The simulation results show that the photovoltaic grid-connected system based on the adaptive VSG control strategy has a good dynamic response, which proves the effectiveness and superiority of the improved strategy.

Key words: photovoltaic microgrid, virtual sync machine, moment of inertia, damping coefficient, adaptive control, MATLAB simulation, SVPWM, inverter

中图分类号:

TP273

孙思男,郝正航. 基于自适应VSG控制的光伏并网系统[J]. 电子科技, 2022, 35(9): 22-29.

SUN Sinan,HAO Zhenghang. Photovoltaic Grid-Connected System Based on Adaptive VSG Control[J]. Electronic Science and Technology, 2022, 35(9): 22-29.

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区间	Δω	dω/dt	Δω(dω/dt)	J的变化情况	D的变化情况
①	>0	>0	>0	增加	增加
②	>0	<0	<0	减小	增加
③	<0	<0	>0	增加	增加
④	<0	>0	<0	减小	增加