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DC Voltage Compensation and Anti-overlimit Control Strategy for Hybrid Energy Storage System of Virtual Synchronous Generator
LÜ Shixuan, WANG Wei, YANG Dongdong, LIU Zongwei, ZHENG Lijun
Electric Power Construction ›› 2025, Vol. 46 ›› Issue (8) : 129-137.
PDF(8769 KB)
PDF(8769 KB)
DC Voltage Compensation and Anti-overlimit Control Strategy for Hybrid Energy Storage System of Virtual Synchronous Generator
[Objective] This study addresses the issue of declining inertia power simulation accuracy and inertia support capability of the hybrid energy storage system based on DC voltage-grid frequency coupling control during severe fluctuations in grid frequency； a strategy involving DC voltage compensation and anti-overlimit control is proposed. [Methods] The anti-overlimit control strategy utilizes the asymptotic nature of a hyperbolic tangent function to limit the maximum deviation of the DC voltage，and a linear correction coefficient is designed to ensure coupling linearity between the DC voltage and grid frequency. The DC voltage compensation control strategy employs a high-pass filter to compensate for the voltage deviations. The optimal cutoff frequency is determined by analyzing the influence of the filter cutoff frequency on the DC voltage recovery time and inertia simulation accuracy. The proposed control strategies are validated using an RTDS real-time simulation platform. [Results] Experimental results demonstrated that these control strategies prevented the DC voltage from exceeding the safe range during rapid grid frequency decline and gradually restored it to its rated value with variations in the grid frequency. [Conclusions] The proposed control strategy ensures that the virtual synchronous machine has good accuracy in the power simulation of inertia and inertia support capability.
virtual synchronous generator / DC voltage compensation / DC voltage anti-overlimit / high-pass filter / hyperbolic tangent function
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摘要：为了解决分布式电源渗透率升高对电力系统稳定性的影响问题，国内外学者提出了虚拟同步发电机的控制策略，将同步发电机的转动惯量和阻尼特性引入到传统的逆变器控制中，提升了分布式电源的并网友好性。该文提出了虚拟同步发电机中蓄电池和超级电容混合储能系统的功率分配方法，对关键参数的整定进行了分析。搭建Matlab/Simulink仿真模型，分析了负载恒定、阶跃突变和连续变化情况下直流侧混合储能系统的功率分配效果，验证了所提功率分配方案的可行性和有效性。
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