| 邓玮璍,周江林.孤岛微网DC/AC逆变器电压H∞鲁棒控制[J].电子测量与仪器学报,2020,34(3):195-200 |
| 孤岛微网DC/AC逆变器电压H∞鲁棒控制 |
| H∞ robust voltage control for DC/AC inverter in islanded microgrid |
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| DOI： |
| 中文关键词: 孤岛微网 二次电压调节 负荷扰动 参数摄动 H∞鲁棒控制 |
| 英文关键词:islanded microgrid secondary voltage regulation load disturbance parameter perturbation H∞ robust control |
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| 中文摘要: |
| DC/AC逆变器控制策略的优劣直接影响到孤岛微网系统电压质量水平，针对其在电压环采用PI控制时的抗干扰和参数摄动性能不佳问题，提出了一种电压H∞鲁棒控制方法。该方法采用集中式二次电压调节，恢复了由传统下垂控制造成的电压频率跌落。通过将负荷电流视为外部扰动输入量，建立了孤岛微网简化数学状态空间模型；基于混合灵敏度优化问题选择加权函数W1、W2、W3，设计了电压H∞鲁棒控制器，以提高DC/AC逆变器的抗扰动能力，同时优化其在系统参数摄动时的鲁棒性能。最后通过MATLAB/Simulink仿真验证了该控制策略的可行性，并表明了电压H∞鲁棒控制器能够保证DC/AC逆变器具备较强的抗干扰和鲁棒稳定性能。 |
| 英文摘要: |
| The performance of the DC/AC inverter control strategy has a significant influence on the voltage level of the islanded microgrid system. The traditional PI control in voltage loop cannot meet the system performance requirement under load disturbance or parameter perturbation. Aiming at this problem, a voltage H∞ robust control method for the DC/AC inverter in islanded microgrid is proposed. A centralized secondary voltage regulation is used to restore the voltage deviation caused by conventional droop control. By considering the load current as the external disturbance input, the simplified mathematical state space model of the island microgrid is established. Then, a voltage H∞ robust controller is designed by selected weighting functionsbased on the mixed sensitivity optimization problem, which can improve the ability of DC/AC inverter so that its robust performance can be optimized under the system parameter perturbation. Finally, the numerical simulation result shows that the proposed strategy is feasible and the H∞ robust controller is of the stronger stability under disturbance. |
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