基于FS-MPC的级联型STATCOM控制延时消除方法

Control delay elimination for cascaded multilevel STATCOM based on finite states model predictive control

提出一种新型有限状态模型预测控制的控制延时消除方法,并将其成功应用于级联型STATCOM,旨在提高级联型STATCOM的电流跟踪控制效果。有限状态模型预测控制用一个指标函数对各种预测结果进行评估,选择使指标函数值最小的开关组合,从而实现对功率变换器的快速控制,但研究发现,控制延时会较大程度影响预测控制的电流跟踪效果。本文在对系统离散化数学模型进一步递推的基础上,通过对传统数字控制的控制流程改进,减小了控制延时的影响、提高了系统性能。为了验证该方法的有效性,在仿真测试的基础上进行了实验验证,2k W样机的实验结果显示,级联型STATCOM具有快速的电流跟踪能力,同时有限状态模型预测控制使系统具有较强的鲁棒性。

A novel control delay elimination for finite state-model predictive control was proposed,and successfully applied to cascade STATCOM,aiming at improving current tracking control of the cascaded STATCOM. Finite states-model predictive control（ FS-MPC） optimization problem was simplified and reduced to the prediction of the system behavior only for those possible switching states. Then,each prediction was used to evaluate a cost function to complete the control. However,due to the control delay,current tracking effect was reduced,based on the further recursion for mathematical model. Traditional process of the digital controller to reduce the influence of the control delay,and the system performance was improved. Simulation and experimental verification show the effectiveness of the method,based on the test of 2 k W prototype. Experimental results show that a cascade STATCOM based on FS-MPC has fast current tracking capability,and the system has strong the robustness.