Abstract
Influence on an injected current arising from grid voltage is a noticeable issue in the design of grid-tied inverter, especially under low control gain or low power command conditions. The grid voltage full feedforward strategy is a widely used strategy to solve this problem, whereas the physical meanings of the full feedforward items are unclear. In this brief, the full feedforward of the direct current control type LCL-filter inverter and indirect current control type LCCL-filter inverter was reviewed from the circuit and control perspectives. The full feedforward items were rephrased. The new interpretations indicate that the full feedforward strategy is physically rational and complete.
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