| 引用本文: | 金 楠,侯智文,代东任,武 洁,申永鹏.虚拟同步机电流传感器故障容错模型预测控制[J].电力系统保护与控制,2023,51(7):117-125.[点击复制] |
| JIN Nan,HOU Zhiwen,DAI Dongren,WU Jie,SHEN Yongpeng.Fault-tolerant model predictive control for a virtual synchronous generator with current sensor faults[J].Power System Protection and Control,2023,51(7):117-125[点击复制] |
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| 摘要: |
| 虚拟同步机(virtual synchronous generator, VSG)交流电流传感器容错控制中存在不可测区域，影响VSG容错运行。为此，提出基于电流重构的故障容错模型预测控制(model predictive control, MPC)策略，消除不可测区域，实现全域内的电流重构。首先，该策略分析不同开关状态下直流电流测量值对应的相电流，设计交流电流传感器故障判据。其次，分析不可测区域成因并根据可测量相电流的数量不足和矢量持续时间过短将其分为两类。为消除因可测量相电流不足造成的不可测区域，设计可测量两相电流的虚拟矢量，通过直流电流重构三相电流。为消除因矢量持续时间过短造成的不可测区域，建立LCL型VSG输出电流预测模型，通过直流电流和单电压矢量的预测电流重构三相电流。最后，通过故障容错MPC策略从虚拟矢量和单电压矢量中选择最优矢量，实现全域内的电流重构和VSG的容错运行。实验验证了所提方法的有效性，说明该方法提高了VSG的可靠性和容错能力。 |
| 关键词: 电流传感器故障 电流重构 模型预测控制 虚拟同步机 |
| DOI：10.19783/j.cnki.pspc.221001 |
| 投稿时间：2022-06-30修订日期：2022-08-31 |
| 基金项目:国家自然科学基金项目资助(U2004166)；河南省高校科技创新团队支持计划项目资助(22IRTSTHN017) |
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| Fault-tolerant model predictive control for a virtual synchronous generator with current sensor faults |
| JIN Nan,HOU Zhiwen,DAI Dongren,WU Jie,SHEN Yongpeng |
| (School of Electrical Information Engineering, Zhengzhou University of Light Industry, Zhengzhou 450002, China) |
| Abstract: |
| There are some unmeasurable areas in the fault-tolerant control for an AC current sensor fault in a virtual synchronous generator (VSG). This fact affects the fault-tolerant operation of VSG. To overcome this, a fault-tolerant model predictive control (MPC) strategy based on current reconstruction is proposed to eliminate unmeasurable areas and realize current reconstruction in whole areas. First, this strategy analyzes the corresponding phase current of measured DC current under different switching states, and designs the fault criterion of the AC current sensor. Second, the causes of unmeasurable areas are analyzed. They are divided into two kinds according to the insufficient number of measurable phase currents and vector durations that are too short. To eliminate the unmeasurable areas caused by the former, virtual vectors that can measure two-phase currents are designed, and three-phase currents can be reconstructed by DC current. To eliminate the latter, the output current prediction model of a VSG with an LCL filter is built, and three-phase currents can be reconstructed by DC current and the predictive currents of single voltage vectors. Finally, the optimal vector is selected from virtual vectors and single voltage vectors by the fault-tolerant MPC strategy, and the current reconstruction in whole areas and the fault-tolerant operation of a VSG are realized. The experiments verify the effectiveness of the proposed method. This shows that the proposed method improves the reliability and fault-tolerant ability of VSG. |
| Key words: current sensor fault current reconstruction model predictive control virtual synchronous generator |
