Abstract
This paper presents a novel strategy to indirectly control the peak dc-link voltage (PDV) of grid-connected quasi-Z-source (qZS) inverter supplied with renewable energy sources (RES). The method is directed to indirectly determine and regulate the pulsating PDV through the qZS network capacitor voltages. The small signal model is developed by representing ac- and dc-sides separately. The ac-side control is designed with higher bandwidth to avoid interference from dc-side. The dc-side control utilizes shoot-through duty ratio to PDV transfer function and controller is designed to minimize the effect of its right-half-plane zero (RHPZ) characteristics. The gating signals are realized through maximum constant boost control in conjunction with one-sixth of third harmonic injection. The strategy is implemented through MATLAB/Simulink and is verified experimentally with real-time simulations (RTSs) in OPAL-RT.
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