| 引用本文: | 李雪萍,王自力,陈燕东,等.基于虚拟惯量模糊自适应的新能源逆变器频率主动支撑策略[J].电力系统保护与控制,2024,52(20):25-37.[点击复制] |
| LI Xueping,WANG Zili,CHEN Y,et al.Active frequency support strategy for new energy inverters based on virtual inertia fuzzy adaptive control[J].Power System Protection and Control,2024,52(20):25-37[点击复制] |
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| 摘要: |
| 新能源通过逆变器大规模接入孤岛微电网，导致系统惯量水平持续下降，系统频率面临严峻的失稳风险。针对此问题，提出了一种基于虚拟惯量模糊自适应的新能源逆变器频率主动支撑控制方法，利用新能源逆变器直流侧电容主动支撑系统频率。首先，通过在新能源逆变器控制回路中引入基于模糊控制的新能源逆变器直流侧电容电压-系统频率耦合的功率控制项，使直流侧电容具备与同步发电机相似的惯性响应。然后，计及频率响应过程对虚拟惯量的差异化需求，设计模糊控制规则，根据频率波动区间自适应调整新能源逆变器直流电容附加虚拟惯量，以减缓系统频率偏移速度，改善系统频率极值，并加快系统频率恢复速度。其次，通过构造李雅普诺夫能量函数证明了采用所提控制方法后系统的稳定性。最后，仿真和实验验证了所提控制方法的有效性。 |
| 关键词: 孤岛微电网 虚拟惯量 模糊自适应 频率主动支撑 李雅普诺夫 |
| DOI：10.19783/j.cnki.pspc.240537 |
| 投稿时间：2023-11-17修订日期：2024-03-19 |
| 基金项目:国家自然科学基金项目资助(52077070)；湖南省自然科学基金青年项目资助(2024JJ6172)；长沙市自然科学基金青年项目资助(kq2402091) |
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| Active frequency support strategy for new energy inverters based on virtual inertia fuzzy adaptive control |
| LI Xueping1,WANG Zili2,CHEN Yandong1,LUO Derong1,LUO Cong1,FU Youze1,FU Jiajun1 |
| (1. School of Electrical and Information Engineering, Hunan University, Changsha 410082, China;
2. Hunan First Normal University, Changsha 410082, China) |
| Abstract: |
| The large-scale integration of new energy sources into islanded microgrids through inverters has led to a continuous decrease in the system inertia level, and the system frequency is facing severe instability risks. In response to this issue, this paper proposes a frequency active support control method for new energy inverters based on virtual inertia fuzzy adaptive control, which utilizes the DC side capacitors of new energy inverters to actively support system frequency. Firstly, by introducing a power control term based on fuzzy control in the control loop of the new energy inverter, which couples the DC side capacitor voltage of the new energy inverter with the system frequency, the DC side capacitor has an inertia response similar to that of a synchronous generator. Then, considering the differential demand for virtual inertia in the frequency response process, a fuzzy control rule is designed to adaptively adjust the additional virtual inertia of the DC capacitor of the new energy inverter according to the frequency fluctuation interval, in order to slow down the system frequency offset speed, improve the system frequency extremum, and accelerate the system frequency recovery speed. Subsequently, the stability of the system after adopting the proposed control method is proved by constructing Lyapunov function. Finally, the effectiveness of the proposed control method is verified through simulation and experiments. |
| Key words: islanded microgrid virtual inertia fuzzy adaptation frequency active support Lyapunov |
