基于牛顿-蚁群算法与选择性谐波调制的电网功率放大器宽频控制策略OA北大核心CSTPCD

Selective harmonic elimination/generation pulse width modulation technology can be combined with multilevel converters to achieve high-frequency grid harmonic power recurrence at a lower switching frequency.To generate a specific harmonic,it needs to solve nonlinear switching angle equations.However,the accuracy of the solutions is constrained by the initial value selection of switching angle.Also,the real-time performance is reduced with the increase of harmonic orders.Therefore,this paper proposes a selective harmonic generation pulse width modulation method based on the Newton-Raphson-ant-colony algorithm.First,it builds switching angle equations,utilizes ant-colony algorithm to calculate the initial values,and further combines the Newton-Raphson algorithm to get the maximum number of harmonics corresponding to different switching frequency and calculation time-step duration.The corresponding relation between modulation ratio and switching angle is analyzed and obtained.Then,by looking up the table to obtain the switching angle and feed-forward it to the voltage control loop,the non-static error tracking of specific harmonics is realized.Finally,taking H-bridge based cascaded multilevel converter as an example,the simulation and experiment platform is built.The correctness of the theoretical analysis and the feasibility of the proposed strategy are verified.