TNPC型光伏并网逆变器的PCHD建模与控制

The PCHD Model and Control of TNPC PV Grid-connected Inverter

根据T型中点箝位(T-type neutral point clamped,TNPC)型光伏并网逆变器拓扑结构建立端口受控的耗散哈密顿(port controlled Hamiltonian with dissipation,PCHD)数学模型。基于此数学模型,采用互联和阻尼配置无源控制(interconnection and damping assignment passivity-based control,IDA-PBC)方法设计控制器。介绍三电平空间矢量调制算法的原理及实现方法。仿真结果表明,该文设计的基于PCHD模型的TNPC型光伏并网逆变器无源控制器能够使光伏并网逆变器实现网侧单位功率因数、电流低谐波;同时,使并网逆变器具有良好的动态、静态特性。

ABSTRACT:Based on the control method of energy shaping and port controlled Hamiltonian with dissipation (PCHD), the model of the TNPC (T-type neutral point clamped) PV grid-connected inverter and its control were studied. Based on the model, the controller was designed by using the method of interconnection and damping assignment passivity-based control. It analyzed the principle and realization method of three-level space vector modulation algorithm. Simulation results show that the designed passive controller of TNPC PV grid-connected inverter can achieve unity power factor, the total harmonic distortion of grid-connected current is low, and the controller also makes the inverter have good dynamic and static performances.