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H-Bridge Zero-Voltage Switch Controlled Rectifier (HB-ZVSCR) Transformerless Mid-Point-Clamped Inverter for Photovoltaic Applications
摘要： A single-phase transformerless mid-point clamped H-bridge zero-voltage switch-controlled rectifier inverter topology is proposed in this paper for photovoltaic (PV) systems to address the issue of common mode (CM) voltage and leakage currents. Apart from the full H-bridge inverter, the proposed voltage clamping circuit consists of two switches and a full-bridge diode which clamps the AC terminal to the DC midpoint (consisting of two DC-link capacitors) during the freewheeling period. As a result, the common mode voltage is held constant which makes it suitable for the grid-connected PV system. The operating principle and CM effect of the proposed topology are analysed and compared with the conventional topologies. This is followed by the thermal analysis and loss calculation, which shows that the proposed circuit is more efficient over the conventional topologies. Validation is carried out using MATLAB-Simulink using the PLECS toolbox followed by a scale down prototype of 1.5 kW. It is shown that the proposed inverter has the 98±1% efficiency over a wide range of loads with a peak efficiency of 98.96%, and the total harmonic distortion of the output current relatively low (≤1.8 %). The leakage current (??????) is measured for different values of parasitic capacitance that reaches a maximum of 16.65 ???? for 330 ???? capacitor under consideration which is well below the limit set by different safety standards.
关键词： photovoltaic system,Common mode voltage (CMV),mid-point clamping,leakage current
更新于2025-09-12 10:27:22
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[IEEE 2019 IEEE Energy Conversion Congress and Exposition (ECCE) - Baltimore, MD, USA (2019.9.29-2019.10.3)] 2019 IEEE Energy Conversion Congress and Exposition (ECCE) - Constant Common-Mode Voltage Transformerless Inverter for Grid-Tied Photovoltaic Application
摘要： This paper proposes a new H-bridge clamped transformerless inverter for the grid-connected Photovoltaic (PV) application. The clamping circuit consists of two switches and a full bridge diodes, which can clamp the AC terminal voltage to the DC midpoint during the freewheeling period. As a result, the common mode voltage (CMV) is held constant, which makes it a suitable candidate for the grid-connected PV system. Furthermore, the efficiency of the proposed topology is relatively higher than other topologies. The operating principle of the proposed topology is analyzed in brief. Thermal modeling for the proposed topology has presented for loss calculation. Finally, the theoretical analysis is validated with simulation and experimental results. Validation is carried out using PLECS simulation and experimental results.
关键词： PV panel,Inverter,Mid-point clamping,CMV
更新于2025-09-11 14:15:04
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[IEEE 2018 IEEE Energy Conversion Congress and Exposition (ECCE) - Portland, OR, USA (2018.9.23-2018.9.27)] 2018 IEEE Energy Conversion Congress and Exposition (ECCE) - Passive Filter Design to Mitigate Dead-Time Effects in Three-Level T-Type NPC Transformerless PV Inverters Modulated with Zero CMV PWM
摘要： Common-mode voltage (CMV) can cause common-mode (CM) current in transformerless PV inverters. In practice, large CM choke is usually required to suppress the CM current. Alternatively, zero common-mode voltage (ZCMV) modulation can be applied to eliminate the CMV. But in practical applications, CMV spikes are inevitable due to the dead-time effect. Such dead-time effect can be mitigated by special PWM sequence design, however, at the expense of increasing switching losses. In this paper, our study addresses this issue by using the DC neutral-point connected LCL (NC-LCL) filter. As the differential-mode (DM) output quality is undermined with ZCMV PWM, the LCL filter parameters must be carefully designed, where both CM and DM filters need to be considered. In addition, filter design for conventional phase disposition (PD) modulation is also included as a comparison. Both simulation results and experimental results are provided for verification.
关键词： Photovoltaic (PV) solar inverter,LCL filter design,Phase disposition modulation,T-type 3L-NPC (PD) inverter,Zero CMV modulation
更新于2025-09-04 15:30:14