Plug-in Compound Feedforward Odd Harmonic Repetitive Control for Single-Phase V2G Inverters

Repetitive control (RC) is a widely used control technique in single-phase vehicle-to-grid (V2G) inverters to effectively reduce current harmonics. However, there is a need to enhance the dynamic response and to improve the harmonic suppression performance, which is susceptible to degradation, particularly during grid frequency fluctuations. This paper proposes a plugin compound feedforward odd harmonic RC (PCFORC) to significantly improve dynamic control accuracy and response speed when the grid frequency fluctuates. In comparison to existing plug-in compound odd harmonic RC (PCORC) methods, PCFORC exhibits the lager gains and broader resonant bandwidths at fundamental and odd harmonic frequencies, resulting in a higher-quality output current. In this paper, the principle, stability analysis, and parameter design of PCFORC are presented, and its effectiveness is verified by a simulation model of a 1.5 kW single-phase V2G inverter, which demonstrates its potential in improving the performance of V2G systems.