基于复系数比例积分控制器的双同步旋转坐标系下的不对称电流控制方法

发布时间：2018-06-16 16:48

本文选题：并网逆变器 + 电流控制　；参考：《中国电机工程学报》2017年18期

【摘要】：由电网不对称故障等因素引起的不对称电压会对并网逆变器的正常运行产生不利影响。控制并网逆变器向电网中注入适当的负序电流,对提高逆变器对异常电网电压尤其是不对称电压的耐受能力和持续运行能力具有重要意义。该文提出一种执行于双同步旋转坐标系下的采用复系数比例积分控制器的不对称电流控制方法。该方法能够快速和无静差地控制正序和负序正弦交流信号。该控制方法无需分解和提取电网电流的正负序分量,控制结构相对简单,且该方法能够同时对正序和负序直轴和交轴电流实现近似解耦控制。同时,在控制器的参数设计中考虑并补偿数字控制延时的影响,从而使得所提控制方法在低开关和采样频率下能够获得良好的稳定性和动态性能。在开关频率为2kH z的样机上对所提方法进行实验研究,实验结果验证了该控制方法的可行性及其性能。
[Abstract]:The asymmetric voltage caused by the asymmetrical fault of the power network will adversely affect the normal operation of the grid-connected inverter. It is of great significance to control the grid connected inverter to inject appropriate negative sequence current into the power network, which is of great significance to improve the endurance and continuous operation ability of the inverter to abnormal grid voltage, especially to asymmetric voltage. In this paper, an asymmetric current control method based on a proportional integral controller with complex coefficients is proposed, which is implemented in a double synchronous rotating coordinate system. This method can control sinusoidal and negative sinusoidal AC signals quickly and without static error. The control method does not need to decompose and extract the positive and negative sequence components of the power network current, and the control structure is relatively simple, and the method can achieve approximate decoupling control of the positive and negative sequence direct and cross axis currents simultaneously. At the same time, the effect of digital control delay is considered and compensated in the controller parameter design, so that the proposed control method can obtain good stability and dynamic performance at low switching and sampling frequency. The proposed method is experimentally studied on a prototype with a switching frequency of 2kHz. The experimental results verify the feasibility and performance of the proposed control method.
【作者单位】：电力设备电气绝缘国家重点实验室(西安交通大学);
【基金】：电力设备与电气绝缘国家重点室项目(EIPE14112,EIPE16310)~~
【分类号】：TM464;TM761

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