基于SHEPWM阶段控制的航空电磁发射波形研究

Research on airborne electromagnetic emission waveform via SHEPWM subsection control

为保证低开关频率条件下发射电流质量,提出半周期镜像对称选择性谐波消除脉冲宽度调制(SHEPWM)阶段控制策略来平衡发射电流质量与开关损耗。基于发射电流及发射线圈阻感负载的时频域信息,建立半周期镜像对称SHEPWM阶段控制非线性超越方程组,利用神经网络递归算法求解出对应交变梯形波电流的开关时刻序列。仿真和实验验证表明:半周期镜像对称SHEPWM阶段控制策略在保证发射波形质量及探测精度的前提下,能有效降低开关损耗。

To ensure the quality of the transmitting current under the low switching frequency condition, a semiperiodic mirror symmetry selective harmonic elimination pulse width modulation(SHEPWM) subsection control approach was proposed to balance transmitting current quality and switching loss. Semi-periodic mirror symmetry SHEPWM nonlinear equations were established based on the time-frequency domain information of transmitting current and transmitting coil, and then the neural network recursive algorithms was used to solve switching time series of trapezoidal wave current. The simulation and experimental results show that the semi-periodic mirror symmetry SHEPWM subsection control strategy can effectively reduce the switching loss on the basis of ensuring the quality of the transmitted waveform and the accuracy of the detection.