基于模型预测控制的防爆变频器低损耗控制

Low loss control of explosion-proof frequency converter based on model predictive control

针对传统矢量控制方法难以对防爆变频器进行主动式热量管理的问题,提出一种基于模型预测控制的防爆变频器低损耗控制方法。建立了防爆变频器热损耗模型,对功率器件导通损耗和开关损耗进行推导分析,指出低损耗控制的关键是降低开关频率;基于模型预测控制系统框架,设计了适用于防爆变频器低损耗控制需求的高精度预测模型,进而基于考虑损耗特征的价值函数完成滚动优化计算;基于1 140V/2MW防爆变频测试样机对所提方法进行实验分析与验证,结果表明:该方法可实现约束条件下防爆变频器多目标优化问题,合理配置多个优化目标权值系数,在满足防爆变频器动稳态性能要求的情况下,有效降低系统整体损耗。

In view of problem that traditional vector control method is difficult to carry out active heat management for explosion-proof frequency converter,a low loss control method for explosion-proof frequency converter based on model predictive control was proposed.Heat loss model of the explosionproof converter was established,and conduction loss and switching loss of power devices were deduced and analyzed,and pointed out that the key of low loss control is to reduce the switching frequency.Based on framework of model prediction control system,high-precision prediction model suitable for low-loss control requirements of explosion-proof converter was designed,and then rolling optimization calculation was completed based on value function considering loss characteristics.The proposed method is analyzed and verified based on 1 140 V/2 MW explosion-proof frequency conversion test prototype,the results show that the method can realize multi-objective optimization problem of explosion-proof frequency converter under constraint condition,and rationally allocate multiple optimization objective weight coefficients,and effectively reduce the overall loss of the system under the condition of satisfying dynamic and steady-stateperformance requirements of explosion-proof frequency converter.