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基于虚拟电力系统稳定器的低频振荡抑制策略

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基于虚拟同步发电机(VSG)控制的新能源机组虽可增强电网惯量及频率稳定性,但可能继承与同步机类似的低频振荡问题.针对该问题,首先基于单台VSG并网的线性化模型,构建了适用于VSG的Phillips-Heffron模型,借助阻尼转矩法挖掘了VSG低频振荡的诱发机理.进一步提出一种附加于VSG无功环节的虚拟电力系统稳定器(VPSS),并给出了控制结构及基于相位补偿法的参数设计过程.研究结果表明:VSG发生低频振荡是由于系统受扰后,虚拟功角的振荡信号经过虚拟励磁调节器对VSG机电振荡回路产生了负阻尼转矩.将所提VPSS接入系统可在几乎不影响振荡频率的前提下,实现0.1～3 Hz下VSG低频振荡的有效抑制.
Low frequency oscillation suppression strategy based on virtual power system stabilizer
Although renewable energy sources controlled by virtual synchronous generator(VSG)could enhance the inertia and frequency stability of the power grid,they may inherit the low-frequency oscilla-tion problem similar to synchronous generator.To address this issue,the Phillips-Heffron model suitable for VSG was constructed at first based on the linearized model of single VSG connected to the grid,and the induction mechanism of low-frequency oscillation of VSG was explored by the damping torque meth-od.Furthermore,a virtual power system stabilizer(VPSS)integrated into the reactive power link of VSG was proposed,and the control structure and parameter design process based on phase compensation meth-od were given.The research results show that low-frequency oscillation of VSG was caused by the nega-tive damping torque of electromechanical oscillation circuit of VSG generated by the oscillation signal of virtual power angle through the virtual excitation regulator after system disturbed.The low-frequency os-cillation of VSG at 0.1-3 Hz could be suppressed effectively after VPSS integrated into the system with-out the oscillation frequency was affected.

virtual synchronous generatorvirtual power system stabilizerlow-frequency oscillationdamping torque analysisphase compensation method

王海鑫、何海文、刘铭崎、杨子豪、郝炎、杨俊友、陈哲

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沈阳工业大学 电气工程学院,辽宁 沈阳 110870

丹麦奥尔堡大学 能源技术系,奥尔堡 丹麦 DK-9220

虚拟同步发电机 虚拟电力系统稳定器 低频振荡 阻尼转矩分析 相位补偿法

高等学校学科创新引智计划(111计划)国家电网辽宁省电力公司"揭榜挂帅"科技攻关计划辽宁省教育厅科技项目

D230052021YF-82LQGD2019005

2024

10.15938/j.emc.2024.05.009

电机与控制学报
哈尔滨理工大学

电机与控制学报

CSTPCD北大核心
影响因子：1.014
ISSN：1007-449X
年,卷(期)：2024.28(5)