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Capacitive leakage current is one of the most important issues for transformerless photovoltaic systems. In order to deal with the capacitive leakage current, a new power electronic inverter circuit is proposed in this paper. The inverter circuit consists of six switches and operates with constant common mode voltage. Theoretical analysis is conduc...
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Citations
... e common-mode voltage (CMV) of the permanent magnet synchronous motor (PMSM) drive system with two-level three-phase voltage source inverter (VSI), as shown in Figure 1, can be approximately calculated according to the voltage between the midpoint of the dc-link capacitor and the neutral point of the three-phase load [1]. e high-frequency CMV can cause many problems including increasing the leakage currents [2], causing damage of the motor shaft [3], and increasing electromagnetic interference [4]. ...
A model predictive control method to reduce the common-mode voltage (MPC-RCMV) with constant switching frequency for PMSM drives is proposed in this paper. Four nonzero VVs are adopted in future control period and the switching sequence is designed to ensure the switching frequency is fixed and equal to the control frequency. By substituting the finite-control nonzero voltage vectors in the current predictive model, a current predictive error space vector diagram is obtained to determine the adopted four VVs. The duty ratio calculating method for the selected four VVs is studied. Compared with the conventional MPC-RCMV method, the current and torque ripples are greatly reduced and the switching frequency is fixed. The simulation and experiment results validate the effectiveness of the proposed method.
Reliability is the main criterion that needs to be focused on, as Photovoltaic systems are gaining prominence in Grid level applications. In this paper, a simple yet efficient current control technique, Proportional Resonant controller with Harmonic Compensation (PR+HC) is used. The performance of the considered 3 phase Inverter topology is evaluated for Low Voltage Ride Through (LVRT) capability as per the Grid Standards. Moreoverleakage current is generated in PV systems due to lack of isolation between the PV panels and the grid. Maintaining the Common Mode Voltage (CMV) to be constant, plays a major part in power electronics converters control for transformerless PV applications. Inverter, which itself is a source of harmonics, needs an effective modulation strategy which is accomplished in this work and the PR+HC controller plays a key role in reduction of harmonics. The active and reactive power control in both the MPPT and LVRT modes is accomplished on the basis of PQ theory. The entire setup of 3 phase PV transfromerless Inverter for LVRT analysis is simulated and verified using MATLAB Simulink software.
