萤火虫算法在三电平NPC逆变器中的应用  

Application of Firefly Algorithm in Three-Level NPC Inverter

作　　者：顾丹[1] GU Dan(School of Intelligent Manufacturing and Transportation,Urban Vocational College of Sichuan,Chengdu 610000,China)

机构地区：[1]四川城市职业学院智能制造与交通学院,四川成都610000

出　　处：《自动化仪表》2021年第7期103-106,共4页Process Automation Instrumentation

摘　　要：针对特定谐波消除脉宽调制(SHEPWM)策略工作过程中准确求解开关角度难度较大的问题,利用萤火虫算法(FA)对SHEPWM策略的非线性方程组进行求解。同时,针对传统FA收敛速度慢、易陷入局部最优解的问题,通过加入惯性权重和高斯扰动策略,分别对FA中的个体位置更新和最优个体更新操作进行改进。利用MATLAB进行仿真。仿真结果表明,改进的FA能够更有效地降低输出电压的谐波畸变率,且具有更快的收敛速度以及更好的收敛精度。通过输出电压波形及其频谱分析,进一步验证了改进的FA的有效性。此外,改进的FA也可用于解决其他应用领域中的寻优求解问题。Aiming at difficult problems in accurately solving the switching angle in the process of the selected harmonic elimination pulse width modulation(SHEPWM)strategy,the firefly algorithm(FA)is used to solve the nonlinear equations of SHEPWM strategy.At the same time,in view of the slow convergence speed of traditional FA and being easy to fall into the local optimal solution,the individual position update and the optimal individual update operation in FA are improved by adding inertial weight and Gaussian disturbance strategy.Through MATLAB simulation,the results show that the improved FA can more effectively reduce the total harmonic distortion rate of the output voltage.It has a faster convergence speed and better convergence accuracy.The effectiveness of the improved FA is verified by the output voltage waveform and its spectrum analysis.Moreover,the improved FA can also be used to solve optimization problems in other application fields.

关 键 词：中性点箝位型逆变器 三电平 特定谐波消除脉宽调制策略 开关角度 萤火虫算法 萤火虫算法优化 非线性方程求解 总谐波失真 

分 类 号：TH89[机械工程—仪器科学与技术]