基于参数自适应的改进VSG风储联合调频控制策略

An Improved VSG-Based Wind-Storage Combined Frequency Regulation Control Strategy with Parameter Self-Adaptation

中文关键词:虚拟同步发电机  风储联合  综合惯性  模糊自适应

keywords:virtual synchronous generator  combined wind-storage  integrated inertia  fizzy adaptive

中文摘要:储能系统响应速度快，联合储能和风力发电机组参与电网调频，有助于提升风电场频率稳定性。针对虚拟同步发电机（virtual synchronous generator，VSG）参数对其调频性能的影响，提出一种基于模糊算法参数自适应的改进VSG风储联合调频控制策略。首先，通过建立VSG小信号模型并进行仿真，分析转动惯量、阻尼系数和电压调节器参数对系统调频性能的影响；其次，提出储能系统改进的VSG控制策略，采用模糊控制自适应调节虚拟惯量、阻尼以及电压调节器的比例与积分系数，以提高系统频率响应速度并减小频率波动。该方法有效缓解了传统PI调节器调节速度与超调量之间的矛盾，从而改善系统的整体调频性能；最后，通过仿真及硬件在环实验，验证所提控制策略的有效性及合理性。仿真结果表明，该策略在提供功率支撑的同时，能够充分发挥风电机组的短时功率调节能力，进一步提升系统频率稳定性。

Abstract:Energy storage systems boast a fast response speed， and the participation of hybrid energy storage combined with wind turbine generators in grid frequency regulation helps improve the frequency stability of wind farms. To address the impact of Virtual Synchronous Generator （VSG） parameters on its frequency regulation performance， this paper proposes an improved VSG-based wind-storage coordinated frequency regulation control strategy with fuzzy algorithm-based adaptive parameter tuning. Firstly， the influences of moment of inertia， damping coefficient and voltage regulator parameters on frequency regulation performance are analyzed by means of the VSG small-signal model and simulation. Secondly， an energy storage-augmented VSG control strategy is put forward， which adopts fuzzy control to adaptively adjust the virtual inertia， damping coefficient， as well as the proportional and integral coefficients of the voltage regulator， so as to accelerate the system frequency response speed and reduce frequency fluctuations. This method effectively mitigates the trade-off between the regulation speed and overshoot of the PI regulator， thereby optimizing the frequency regulation performance. Finally， the effectiveness and rationality of the proposed control strategy are verified through simulations and hardware-in-the-loop experiments. The simulation results show that while providing power support， the proposed strategy can give full play to the short-term power regulation capability of wind turbines， further enhancing the frequency stability of the system.