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基于角频率暂态前馈的VSG控制策略

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针对虚拟同步发电机(VSG)并网时,输出功率的稳态性能与动态性能之间存在耦合,无法同时满足抑制有功振荡和电网一次调频的需求,提出基于角频率暂态前馈的控制策略,通过补偿输出功率,减小Δω,进而减小振荡过程.该控制策略可以有效抑制有功振荡,并且实现了稳态性能与动态性能间的解耦,不会影响一次调频特性,同时提高了响应速度.首先建立VSG有功闭环小信号模型,分析了输出功率稳态性能与动态性能之间的矛盾,并根据同步发电机功角特性分析了有功振荡机理;在此基础上提出了基于角频率暂态前馈的控制策略,利用闭环零极点与Bode图分析了所提控制策略对系统的影响;最后通过仿真和RT-LAB半实物平台验证了所提控制策略的可行性与优越性.
A VSG control strategy based on angular frequency transient feedforward
When the virtual synchronous generator(VSG)is connected to the grid,there is coupling between the steady-state performance and dynamic performance of the output power,which cannot meet the demand of suppress-ing active oscillation and primary frequency modulation of the grid at the same time.A control strategy based on an-gular frequency transient feedforward was proposed.This control strategy reduces Δω by compensating the output power,which in turn reduces the oscillation process.This control strategy can effectively suppress the generation of active oscillations,and realize the decoupling between steady state performance and dynamic performance,which does not affect the characteristics of primary frequency modulation,and improves the response speed.First,VSG active closed-loop small signal model is established,the contradiction between steady state and dynamic perform-ance of output power is analyzed,and the active power oscillation mechanism is analyzed according to the power an-gle characteristics of synchronous generator.On this basis,a control strategy based on angular frequency transient feed-forward is proposed,and the influence of the proposed control strategy on the system is analyzed by using closed-loop zero-pole and Bode diagrams.Finally,the feasibility and superiority of the proposed control strategy are verified by simulation and RT-LAB HIL platform.

virtual synchronous generatoractive power oscillationpower angle characteristicsangular frequency transient feedforwardperformance decoupling

王素娥、刘煜帆、郝鹏飞、陈景文

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陕西科技大学电气与控制工程学院,陕西 西安 710021

虚拟同步发电机 有功振荡 功角特性 角频率暂态前馈 性能解耦

陕西省重点研发计划陕西省教育厅项目西安市科技计划

2023-YBGY-30422JC02321XJZZ003

2024

10.12067/ATEEE2309012

电工电能新技术
中国科学院电工研究所

电工电能新技术

CSTPCD北大核心
影响因子：0.716
ISSN：1003-3076
年,卷(期)：2024.43(5)
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