矿用大功率装备全数字变频调速节能设备研发

发布时间：2019-02-10 18:58

【摘要】：传统有限控制集模型预测控制(FCS-MPC)存在开关频率不固定,采样频率过高等缺点,造成PWM整流器功率脉动较大;而交直交变频器前端采用三相脉宽调制整流器,可有效提高金属矿山球磨机等大功率设备的电能利用效率。三相电压型PWM整流器采用固定开关频率模型预测电流控制(MPCC-CSF),通过评价函数优化算法得到期望电压矢量来代替FCS-MPC中8个离散的电压矢量,增加了系统控制集的覆盖范围。首先,构建包含电流偏差的评价函数;然后,将数学上的二分法思想引入到评价函数中,迭代寻优得到期望电压矢量的幅值和相位,为了提高寻优效率,利用电网电压矢量构建虚拟扇区,缩小寻优范围;最后,结合脉宽调制(SVPWM)技术输出最优开关状态。对所提MPCC-CSF策略与传统的FCS-MPC方法进行的可行性和优越性的仿真和试验对比分析表明,MPCCCSF方法较传统FCS-MPC方法具有控制精度高等优点。
[Abstract]:The traditional finite control set model predictive control (FCS-MPC) has the shortcomings of unstable switching frequency and high sampling frequency, which results in the large power pulsation of PWM rectifier. The three-phase pulse width modulation rectifier is used in the front end of AC-DC converter, which can effectively improve the power utilization efficiency of high power equipment such as metal mine ball mill. The three-phase voltage source PWM rectifier uses a fixed switching frequency model to predict current control (MPCC-CSF). The desired voltage vector is obtained by the evaluation function optimization algorithm to replace the eight discrete voltage vectors in FCS-MPC. The coverage of the system control set is increased. Firstly, the evaluation function including current deviation is constructed. Then, the mathematical dichotomy is introduced into the evaluation function, and the amplitude and phase of the desired voltage vector are obtained by iterative optimization. In order to improve the efficiency of optimization, the virtual sector is constructed by using the voltage vector of the power network, and the optimization range is reduced. Finally, the optimal switching state is outputted by pulse width modulation (SVPWM) technique. The simulation and experimental analysis of the feasibility and superiority of the proposed MPCC-CSF strategy and the traditional FCS-MPC method show that the MPCCCSF method has higher control accuracy than the traditional FCS-MPC method.
【作者单位】：中钢集团马鞍山矿山研究院有限公司;中国矿业大学信息与电气工程学院;华唯金属矿产资源高效循环利用国家工程研究中心有限公司;金属矿山安全与健康国家重点实验室;国网山东省电力公司东营供电公司;
【分类号】：TD67

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