针对有源前端AFE(active front-end)变换器电流环采用的有限控制集模型预测控制算法FCS-MPC(finite control set model predictive control),存在数字控制器计算量大、输出的电流脉动大和系统性能差等问题,提出了一种改进模型预测控制...针对有源前端AFE(active front-end)变换器电流环采用的有限控制集模型预测控制算法FCS-MPC(finite control set model predictive control),存在数字控制器计算量大、输出的电流脉动大和系统性能差等问题,提出了一种改进模型预测控制策略。首先通过坐标变换构建α-β坐标下AFE变换器的预测模型;结合电压型空间矢量变换的原理,引入矢量扇区判断法,减少最优电压矢量选择的次数;最后根据选出来的电压矢量,在1个控制周期内同时施加有效电压矢量和零电压矢量,并分配相应的作用时间。该方法不但保留了传统MPC算法的快速动态响应特性,而且改善了系统的稳态性能。仿真和实验结果均验证了所提方法的正确性与有效性。展开更多
In medium voltage-high power(MV-HP)applications,the high switching frequency of power converter will result in unnecessary energy losses,which directly affect efficiency.To resolve this issue,a novel finite control se...In medium voltage-high power(MV-HP)applications,the high switching frequency of power converter will result in unnecessary energy losses,which directly affect efficiency.To resolve this issue,a novel finite control set-model predictive control(FCS-MPC)with low switching frequency for three-level neutral point clamped-active front-end converters(NPC-AFEs)is proposed.With this approach,the prediction model of three-level NPC-AFEs is established inα-βreference frame,and the control objective of low average switching frequency is introduced into a cost function.The proposed method not only achieves the desired control performance under low switching frequency,but also performs the efficient operation for the three-level NPC-AFEs.The simulation results are provided to verify the effectiveness of proposed control scheme.展开更多
文摘针对有源前端AFE(active front-end)变换器电流环采用的有限控制集模型预测控制算法FCS-MPC(finite control set model predictive control),存在数字控制器计算量大、输出的电流脉动大和系统性能差等问题,提出了一种改进模型预测控制策略。首先通过坐标变换构建α-β坐标下AFE变换器的预测模型;结合电压型空间矢量变换的原理,引入矢量扇区判断法,减少最优电压矢量选择的次数;最后根据选出来的电压矢量,在1个控制周期内同时施加有效电压矢量和零电压矢量,并分配相应的作用时间。该方法不但保留了传统MPC算法的快速动态响应特性,而且改善了系统的稳态性能。仿真和实验结果均验证了所提方法的正确性与有效性。
文摘In medium voltage-high power(MV-HP)applications,the high switching frequency of power converter will result in unnecessary energy losses,which directly affect efficiency.To resolve this issue,a novel finite control set-model predictive control(FCS-MPC)with low switching frequency for three-level neutral point clamped-active front-end converters(NPC-AFEs)is proposed.With this approach,the prediction model of three-level NPC-AFEs is established inα-βreference frame,and the control objective of low average switching frequency is introduced into a cost function.The proposed method not only achieves the desired control performance under low switching frequency,but also performs the efficient operation for the three-level NPC-AFEs.The simulation results are provided to verify the effectiveness of proposed control scheme.
