Direct Power Control of Grid Connected Voltage Source Inverters Using Port-Controlled Hamiltonian System

다국어 초록 (Multilingual Abstract)

This paper presents a new direct active and reactive power control (DPC) scheme for a three-phase gridconnected voltage source inverter (VSI) based on the passivity viewpoint using the port-controlled Hamiltonian(PCH) system. The proposed controller consists of feedforward and feedback parts. The feedforward part (the referenceinputs) is generated through the flatness of the dynamics of the VSI model, which makes the error dynamicsin the form of PCH system. The nonlinear feedback part is designed to enhance the damping of the error dynamicsby using its Lyapunov function. The proposed control method has an ability of the finite time reaching conditionsimilar to sliding mode control (SMC). Moreover, the exponential stability and uniform performance are guaranteedover all operating points without need for reaching a certain manifold. The proposed method is validated byusing an experiment through hardware-in-the-loop system with a digital signal processor. The experimental resultsfor the proposed method are compared with those using SMC-DPC method. The proposed method significantlyreduces the total harmonic distortion in the output current without deteriorating the transient response of the activeand reactive powers. In addition, it provides robust performance against the line impedance variations and the gridvoltage sag.

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